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Overview
Comment:Merged with mainline.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1:dbdc16016102dd777b1e19d93dee2b25c08038fb
User & Date: aku 2008-02-02 07:33:03
Context
2008-02-02
18:44
fixed a minor memleak in update.c:revert_cmd() check-in: 22cc813f user: stephan tags: trunk
07:33
Merged with mainline. check-in: dbdc1601 user: aku tags: trunk
07:03
Changeset handling, extended logging of how parent is determined. Fossil access, fixed importrev call to use correct workspace/repository. Fixed handling of output, stripping unwanted text, checking of output syntax. Extended logging. Added final 'rebuild'. NOTE: formation of the changesets/manifests is buggy, is not tracking unchanged files across changesets. Further not yet tracking when files have been removed. check-in: 9214c118 user: aku tags: trunk
2008-02-01
19:58
Fix the makefile so that you can build twice in a row from the source directory and it still works. check-in: 1b52d130 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/db.c.

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  if( g.configOpen ){
    return db_exists("SELECT 1 FROM global_config WHERE name=%Q", zName);
  }else{
    return 0;
  }
}
int db_get_int(const char *zName, int dflt){
  int v;
  int rc;
  if( g.repositoryOpen ){
    Stmt q;
    db_prepare(&q, "SELECT value FROM config WHERE name=%Q", zName);
    rc = db_step(&q);
    if( rc==SQLITE_ROW ){
      v = db_column_int(&q, 0);







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  if( g.configOpen ){
    return db_exists("SELECT 1 FROM global_config WHERE name=%Q", zName);
  }else{
    return 0;
  }
}
int db_get_int(const char *zName, int dflt){
  int v = dflt;
  int rc;
  if( g.repositoryOpen ){
    Stmt q;
    db_prepare(&q, "SELECT value FROM config WHERE name=%Q", zName);
    rc = db_step(&q);
    if( rc==SQLITE_ROW ){
      v = db_column_int(&q, 0);

Changes to src/info.c.

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  db_multi_exec(
     "CREATE TEMP TABLE refs(type,link);"
     "INSERT INTO refs "
     "  SELECT 'f', rid FROM blob WHERE uuid GLOB '%s*'"
     "  UNION ALL"
     "  SELECT 'w', substr(tagname,6) FROM tag"
     "   WHERE tagname='wiki-%q'"
     "  UNION ALL"
     "  SELECT 't', tkt_uuid FROM ticket WHERE tkt_uuid GLOB '%s*';",
     zName, zName, zName
  );
  cnt = db_int(0, "SELECT count(*) FROM refs");
  if( cnt==0 ){
    style_header("Broken Link");
    @ <p>No such object: %h(zName)</p>
    style_footer();







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  db_multi_exec(
     "CREATE TEMP TABLE refs(type,link);"
     "INSERT INTO refs "
     "  SELECT 'f', rid FROM blob WHERE uuid GLOB '%s*'"
     "  UNION ALL"
     "  SELECT 'w', substr(tagname,6) FROM tag"
     "   WHERE tagname='wiki-%q'"
     /*"  UNION ALL"
     "  SELECT 't', tkt_uuid FROM ticket WHERE tkt_uuid GLOB '%s*';"*/,
     zName, zName, zName
  );
  cnt = db_int(0, "SELECT count(*) FROM refs");
  if( cnt==0 ){
    style_header("Broken Link");
    @ <p>No such object: %h(zName)</p>
    style_footer();

Changes to src/main.mk.

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VERSION.h:	$(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest
	awk '{ printf "#define MANIFEST_UUID \"%s\"\n", $$1}'  $(SRCDIR)/../manifest.uuid >VERSION.h
	awk '{ printf "#define MANIFEST_VERSION \"[%.10s]\"\n", $$1}'  $(SRCDIR)/../manifest.uuid >>VERSION.h
	awk '$$1=="D"{printf "#define MANIFEST_DATE \"%s %s\"\n", substr($$2,1,10),substr($$2,12)}'  $(SRCDIR)/../manifest >>VERSION.h

$(APPNAME):	headers $(OBJ) sqlite3.o
	$(TCC) -o $(APPNAME) $(OBJ) sqlite3.o $(LIB)







clean:	
	rm -f *.o *_.c $(APPNAME) VERSION.h
	rm -f translate makeheaders mkindex page_index.h headers
	rm -f add.h bag.h blob.h branch.h cgi.h checkin.h checkout.h clearsign.h clone.h comformat.h construct.h content.h db.h delta.h deltacmd.h descendents.h diff.h diffcmd.h encode.h file.h http.h info.h login.h main.h manifest.h md5.h merge.h merge3.h name.h pivot.h pqueue.h printf.h rebuild.h rss.h schema.h setup.h sha1.h style.h subscript.h sync.h tag.h timeline.h tkt.h tktconfig.h tktsetup.h undo.h update.h url.h user.h verify.h vfile.h wiki.h wikiformat.h xfer.h zip.h

headers:	makeheaders mkindex $(TRANS_SRC) ./VERSION.h







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VERSION.h:	$(SRCDIR)/../manifest.uuid $(SRCDIR)/../manifest
	awk '{ printf "#define MANIFEST_UUID \"%s\"\n", $$1}'  $(SRCDIR)/../manifest.uuid >VERSION.h
	awk '{ printf "#define MANIFEST_VERSION \"[%.10s]\"\n", $$1}'  $(SRCDIR)/../manifest.uuid >>VERSION.h
	awk '$$1=="D"{printf "#define MANIFEST_DATE \"%s %s\"\n", substr($$2,1,10),substr($$2,12)}'  $(SRCDIR)/../manifest >>VERSION.h

$(APPNAME):	headers $(OBJ) sqlite3.o
	$(TCC) -o $(APPNAME) $(OBJ) sqlite3.o $(LIB)

# This rule prevents make from using its default rules to try build
# an executable named "manifest" out of the file named "manifest.c"
#
$(SRCDIR)/../manifest:	
	# noop

clean:	
	rm -f *.o *_.c $(APPNAME) VERSION.h
	rm -f translate makeheaders mkindex page_index.h headers
	rm -f add.h bag.h blob.h branch.h cgi.h checkin.h checkout.h clearsign.h clone.h comformat.h construct.h content.h db.h delta.h deltacmd.h descendents.h diff.h diffcmd.h encode.h file.h http.h info.h login.h main.h manifest.h md5.h merge.h merge3.h name.h pivot.h pqueue.h printf.h rebuild.h rss.h schema.h setup.h sha1.h style.h subscript.h sync.h tag.h timeline.h tkt.h tktconfig.h tktsetup.h undo.h update.h url.h user.h verify.h vfile.h wiki.h wikiformat.h xfer.h zip.h

headers:	makeheaders mkindex $(TRANS_SRC) ./VERSION.h

Changes to src/makemake.tcl.

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		$(SRCDIR)/../manifest.uuid >>VERSION.h
	awk '$$1=="D"{printf "#define MANIFEST_DATE \"%s %s\"\n",\
		substr($$2,1,10),substr($$2,12)}' \
		$(SRCDIR)/../manifest >>VERSION.h

$(APPNAME):	headers $(OBJ) sqlite3.o
	$(TCC) -o $(APPNAME) $(OBJ) sqlite3.o $(LIB)







clean:	
	rm -f *.o *_.c $(APPNAME) VERSION.h
	rm -f translate makeheaders mkindex page_index.h headers}

set hfiles {}
foreach s [lsort $src] {lappend hfiles $s.h}







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		$(SRCDIR)/../manifest.uuid >>VERSION.h
	awk '$$1=="D"{printf "#define MANIFEST_DATE \"%s %s\"\n",\
		substr($$2,1,10),substr($$2,12)}' \
		$(SRCDIR)/../manifest >>VERSION.h

$(APPNAME):	headers $(OBJ) sqlite3.o
	$(TCC) -o $(APPNAME) $(OBJ) sqlite3.o $(LIB)

# This rule prevents make from using its default rules to try build
# an executable named "manifest" out of the file named "manifest.c"
#
$(SRCDIR)/../manifest:	
	# noop

clean:	
	rm -f *.o *_.c $(APPNAME) VERSION.h
	rm -f translate makeheaders mkindex page_index.h headers}

set hfiles {}
foreach s [lsort $src] {lappend hfiles $s.h}

Changes to src/setup.c.

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  @
  @ <li><p>
  @ Login is required for user "<b>anonymous</b>" but the password
  @ is displayed on the login screen beside the password entry box
  @ so anybody who can read should be able to login as anonymous.
  @ On the other hand, spiders and web-crawlers will typically not
  @ be able to login.  Set the capabilities of the anonymous user
  @ to things that you want any human to be able to do, but no any
  @ spider.
  @ </p></li>
  @ </form>
  style_footer();
}


................................................................................

  @ <hr>
  entry_attribute("Login expiration time", 6, "cookie-expire", "cex", "8766");
  @ <p>The number of hours for which a login is valid.  This must be a
  @ positive number.  The default is 8760 hours which is approximately equal
  @ to a year.</p>










  @ <hr>
  @ <p><input type="submit"  name="submit" value="Apply Changes"></p>
  @ </form>
  db_end_transaction(0);
  style_footer();
}








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  @
  @ <li><p>
  @ Login is required for user "<b>anonymous</b>" but the password
  @ is displayed on the login screen beside the password entry box
  @ so anybody who can read should be able to login as anonymous.
  @ On the other hand, spiders and web-crawlers will typically not
  @ be able to login.  Set the capabilities of the anonymous user
  @ to things that you want any human to be able to do, but not any
  @ spider.
  @ </p></li>
  @ </form>
  style_footer();
}


................................................................................

  @ <hr>
  entry_attribute("Login expiration time", 6, "cookie-expire", "cex", "8766");
  @ <p>The number of hours for which a login is valid.  This must be a
  @ positive number.  The default is 8760 hours which is approximately equal
  @ to a year.</p>

  @ <hr>
  entry_attribute("Download packet limit", 10, "max-download", "mxdwn",
                  "5000000");
  @ <p>Fossil tries to limit out-bound sync, clone, and pull packets
  @ to this many bytes, uncompressed.  If the client requires more data
  @ than this, then the client will issue multiple HTTP requests.
  @ Values below 1 million are not recommended.  5 million is a 
  @ reasonable number.</p>

  @ <hr>
  @ <p><input type="submit"  name="submit" value="Apply Changes"></p>
  @ </form>
  db_end_transaction(0);
  style_footer();
}

Changes to src/sqlite3.c.

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** on how SQLite interfaces are suppose to operate.
**
** The name of this file under configuration management is "sqlite.h.in".
** The makefile makes some minor changes to this file (such as inserting
** the version number) and changes its name to "sqlite3.h" as
** part of the build process.
**
** @(#) $Id: sqlite.h.in,v 1.218 2007/07/19 12:41:40 drh Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.
*/
#ifdef __cplusplus
extern "C" {
#endif









/*
** Make sure these symbols where not defined by some previous header
** file.
*/
#ifdef SQLITE_VERSION
# undef SQLITE_VERSION
#endif
#ifdef SQLITE_VERSION_NUMBER
# undef SQLITE_VERSION_NUMBER
#endif

/*
** CAPI3REF: Compile-Time Library Version Numbers
**
** The version of the SQLite library is contained in the sqlite3.h
** header file in a #define named SQLITE_VERSION.  The SQLITE_VERSION
** macro resolves to a string constant.
**
** The format of the version string is "X.Y.Z", where
** X is the major version number, Y is the minor version number and Z
** is the release number.  The X.Y.Z might be followed by "alpha" or "beta".
** For example "3.1.1beta".
**
** The X value is always 3 in SQLite.  The X value only changes when
** backwards compatibility is broken and we intend to never break
** backwards compatibility.  The Y value only changes when

** there are major feature enhancements that are forwards compatible
** but not backwards compatible.  The Z value is incremented with

** each release but resets back to 0 when Y is incremented.
**
** The SQLITE_VERSION_NUMBER is an integer with the value 
** (X*1000000 + Y*1000 + Z). For example, for version "3.1.1beta", 
** SQLITE_VERSION_NUMBER is set to 3001001. To detect if they are using 
** version 3.1.1 or greater at compile time, programs may use the test 
** (SQLITE_VERSION_NUMBER>=3001001).


**
** See also: [sqlite3_libversion()] and [sqlite3_libversion_number()].



*/
#define SQLITE_VERSION         "3.4.1"
#define SQLITE_VERSION_NUMBER 3004001

/*
** CAPI3REF: Run-Time Library Version Numbers

**
** These routines return values equivalent to the header constants





** [SQLITE_VERSION] and [SQLITE_VERSION_NUMBER].  The values returned
** by this routines should only be different from the header values
** if you compile your program using an sqlite3.h header from a
** different version of SQLite that the version of the library you
** link against.
**
** The sqlite3_version[] string constant contains the text of the
** [SQLITE_VERSION] string.  The sqlite3_libversion() function returns
** a poiner to the sqlite3_version[] string constant.  The function
** is provided for DLL users who can only access functions and not

** constants within the DLL.











*/
extern const char sqlite3_version[];
const char *sqlite3_libversion(void);
int sqlite3_libversion_number(void);

/*


























** CAPI3REF: Database Connection Handle

**
** Each open SQLite database is represented by pointer to an instance of the
** opaque structure named "sqlite3".  It is useful to think of an sqlite3
** pointer as an object.  The [sqlite3_open] interface is its constructor

** and [sqlite3_close] is its destructor.  There are many other interfaces
** (such as [sqlite3_prepare_v2], [sqlite3_create_function], and
** [sqlite3_busy_timeout] to name but three) that are methods on this
** object.
*/
typedef struct sqlite3 sqlite3;


/*
** CAPI3REF: 64-Bit Integer Types

**
** Some compilers do not support the "long long" datatype.  So we have

** to do compiler-specific typedefs for 64-bit signed and unsigned integers.
**
** Many SQLite interface functions require a 64-bit integer arguments.
** Those interfaces are declared using this typedef.










*/
#ifdef SQLITE_INT64_TYPE
  typedef SQLITE_INT64_TYPE sqlite_int64;
  typedef unsigned SQLITE_INT64_TYPE sqlite_uint64;
#elif defined(_MSC_VER) || defined(__BORLANDC__)
  typedef __int64 sqlite_int64;
  typedef unsigned __int64 sqlite_uint64;
#else
  typedef long long int sqlite_int64;
  typedef unsigned long long int sqlite_uint64;
#endif



/*
** If compiling for a processor that lacks floating point support,
** substitute integer for floating-point
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# define double sqlite_int64
#endif

/*
** CAPI3REF: Closing A Database Connection
**
** Call this function with a pointer to a structure that was previously
** returned from [sqlite3_open()] and the corresponding database will by
** closed.
**


** All SQL statements prepared using [sqlite3_prepare_v2()] or
** [sqlite3_prepare16_v2()] must be destroyed using [sqlite3_finalize()]
** before this routine is called. Otherwise, SQLITE_BUSY is returned and the













** database connection remains open.














*/
int sqlite3_close(sqlite3 *);

/*
** The type for a callback function.
** This is legacy and deprecated.  It is included for historical
** compatibility and is not documented.
*/
typedef int (*sqlite3_callback)(void*,int,char**, char**);

/*
** CAPI3REF: One-Step Query Execution Interface
**
** This interface is used to do a one-time evaluatation of zero
** or more SQL statements.  UTF-8 text of the SQL statements to


** be evaluted is passed in as the second parameter.  The statements
** are prepared one by one using [sqlite3_prepare()], evaluated
** using [sqlite3_step()], then destroyed using [sqlite3_finalize()].






**



















** If one or more of the SQL statements are queries, then

** the callback function specified by the 3rd parameter is
** invoked once for each row of the query result.  This callback

** should normally return 0.  If the callback returns a non-zero

** value then the query is aborted, all subsequent SQL statements
** are skipped and the sqlite3_exec() function returns the SQLITE_ABORT.


**
** The 4th parameter to this interface is an arbitrary pointer that is
** passed through to the callback function as its first parameter.


**
** The 2nd parameter to the callback function is the number of
** columns in the query result.  The 3rd parameter to the callback
** is an array of strings holding the values for each column







** as extracted using [sqlite3_column_text()].
** The 4th parameter to the callback is an array of strings
** obtained using [sqlite3_column_name()] and holding
** the names of each column.
**
** The callback function may be NULL, even for queries.  A NULL
** callback is not an error.  It just means that no callback
** will be invoked.



**




** If an error occurs while parsing or evaluating the SQL (but
** not while executing the callback) then an appropriate error
** message is written into memory obtained from [sqlite3_malloc()] and







** *errmsg is made to point to that message.  The calling function
** is responsible for freeing the memory that holds the error
** message.   Use [sqlite3_free()] for this.  If errmsg==NULL,
** then no error message is ever written.
**
** The return value is is SQLITE_OK if there are no errors and
** some other [SQLITE_OK | return code] if there is an error.  
** The particular return value depends on the type of error. 


**

















*/
int sqlite3_exec(
  sqlite3*,                                  /* An open database */
  const char *sql,                           /* SQL to be evaluted */
  int (*callback)(void*,int,char**,char**),  /* Callback function */
  void *,                                    /* 1st argument to callback */
  char **errmsg                              /* Error msg written here */
);

/*
** CAPI3REF: Result Codes
** KEYWORDS: SQLITE_OK
**
** Many SQLite functions return an integer result code from the set shown
** above in order to indicates success or failure.
**
** The result codes above are the only ones returned by SQLite in its
** default configuration.  However, the [sqlite3_extended_result_codes()]
** API can be used to set a database connectoin to return more detailed
** result codes.
**
** See also: [SQLITE_IOERR_READ | extended result codes]
**
*/
#define SQLITE_OK           0   /* Successful result */
/* beginning-of-error-codes */
#define SQLITE_ERROR        1   /* SQL error or missing database */
#define SQLITE_INTERNAL     2   /* NOT USED. Internal logic error in SQLite */
#define SQLITE_PERM         3   /* Access permission denied */
#define SQLITE_ABORT        4   /* Callback routine requested an abort */
#define SQLITE_BUSY         5   /* The database file is locked */
#define SQLITE_LOCKED       6   /* A table in the database is locked */
#define SQLITE_NOMEM        7   /* A malloc() failed */
#define SQLITE_READONLY     8   /* Attempt to write a readonly database */
#define SQLITE_INTERRUPT    9   /* Operation terminated by sqlite3_interrupt()*/
................................................................................
#define SQLITE_NOTFOUND    12   /* NOT USED. Table or record not found */
#define SQLITE_FULL        13   /* Insertion failed because database is full */
#define SQLITE_CANTOPEN    14   /* Unable to open the database file */
#define SQLITE_PROTOCOL    15   /* NOT USED. Database lock protocol error */
#define SQLITE_EMPTY       16   /* Database is empty */
#define SQLITE_SCHEMA      17   /* The database schema changed */
#define SQLITE_TOOBIG      18   /* String or BLOB exceeds size limit */
#define SQLITE_CONSTRAINT  19   /* Abort due to contraint violation */
#define SQLITE_MISMATCH    20   /* Data type mismatch */
#define SQLITE_MISUSE      21   /* Library used incorrectly */
#define SQLITE_NOLFS       22   /* Uses OS features not supported on host */
#define SQLITE_AUTH        23   /* Authorization denied */
#define SQLITE_FORMAT      24   /* Auxiliary database format error */
#define SQLITE_RANGE       25   /* 2nd parameter to sqlite3_bind out of range */
#define SQLITE_NOTADB      26   /* File opened that is not a database file */
#define SQLITE_ROW         100  /* sqlite3_step() has another row ready */
#define SQLITE_DONE        101  /* sqlite3_step() has finished executing */
/* end-of-error-codes */

/*
** CAPI3REF: Extended Result Codes


**
** In its default configuration, SQLite API routines return one of 26 integer
** result codes described at result-codes.  However, experience has shown that
** many of these result codes are too course-grained.  They do not provide as
** much information about problems as users might like.  In an effort to
** address this, newer versions of SQLite (version 3.3.8 and later) include
** support for additional result codes that provide more detailed information
** about errors.  The extended result codes are enabled (or disabled) for 
** each database
** connection using the [sqlite3_extended_result_codes()] API.

** 
** Some of the available extended result codes are listed above.
** We expect the number of extended result codes will be expand
** over time.  Software that uses extended result codes should expect
** to see new result codes in future releases of SQLite.
** 
** The symbolic name for an extended result code always contains a related
** primary result code as a prefix.  Primary result codes contain a single
** "_" character.  Extended result codes contain two or more "_" characters.
** The numeric value of an extended result code can be converted to its
** corresponding primary result code by masking off the lower 8 bytes.
**
** The SQLITE_OK result code will never be extended.  It will always
** be exactly zero.













*/
#define SQLITE_IOERR_READ          (SQLITE_IOERR | (1<<8))
#define SQLITE_IOERR_SHORT_READ    (SQLITE_IOERR | (2<<8))
#define SQLITE_IOERR_WRITE         (SQLITE_IOERR | (3<<8))
#define SQLITE_IOERR_FSYNC         (SQLITE_IOERR | (4<<8))
#define SQLITE_IOERR_DIR_FSYNC     (SQLITE_IOERR | (5<<8))
#define SQLITE_IOERR_TRUNCATE      (SQLITE_IOERR | (6<<8))
#define SQLITE_IOERR_FSTAT         (SQLITE_IOERR | (7<<8))
#define SQLITE_IOERR_UNLOCK        (SQLITE_IOERR | (8<<8))
#define SQLITE_IOERR_RDLOCK        (SQLITE_IOERR | (9<<8))
#define SQLITE_IOERR_DELETE        (SQLITE_IOERR | (10<<8))
#define SQLITE_IOERR_BLOCKED       (SQLITE_IOERR | (11<<8))


/*
























































































































































































































































































































































































** CAPI3REF: Enable Or Disable Extended Result Codes
**
** This routine enables or disables the
** [SQLITE_IOERR_READ | extended result codes] feature.
** By default, SQLite API routines return one of only 26 integer






** [SQLITE_OK | result codes].  When extended result codes
** are enabled by this routine, the repetoire of result codes can be
** much larger and can (hopefully) provide more detailed information
** about the cause of an error.

**
** The second argument is a boolean value that turns extended result

** codes on and off.  Extended result codes are off by default for
** backwards compatibility with older versions of SQLite.


*/
int sqlite3_extended_result_codes(sqlite3*, int onoff);

/*
** CAPI3REF: Last Insert Rowid
**
** Each entry in an SQLite table has a unique 64-bit signed integer key
** called the "rowid". The rowid is always available as an undeclared
** column named ROWID, OID, or _ROWID_.  If the table has a column of

** type INTEGER PRIMARY KEY then that column is another an alias for the
** rowid.

**
** This routine returns the rowid of the most recent INSERT into
** the database from the database connection given in the first 

** argument.  If no inserts have ever occurred on this database
** connection, zero is returned.
**
** If an INSERT occurs within a trigger, then the rowid of the
** inserted row is returned by this routine as long as the trigger
** is running.  But once the trigger terminates, the value returned
** by this routine reverts to the last value inserted before the
** trigger fired.


































*/
sqlite_int64 sqlite3_last_insert_rowid(sqlite3*);

/*
** CAPI3REF: Count The Number Of Rows Modified
**
** This function returns the number of database rows that were changed
** (or inserted or deleted) by the most recent SQL statement.  Only


** changes that are directly specified by the INSERT, UPDATE, or
** DELETE statement are counted.  Auxiliary changes caused by
** triggers are not counted.  Use the [sqlite3_total_changes()] function
** to find the total number of changes including changes caused by triggers.
**























** Within the body of a trigger, the sqlite3_changes() interface can be
** called to find the number of
** changes in the most recently completed INSERT, UPDATE, or DELETE
** statement within the body of the trigger.


**
** All changes are counted, even if they were later undone by a
** ROLLBACK or ABORT.  Except, changes associated with creating and
** dropping tables are not counted.
**
** If a callback invokes [sqlite3_exec()] or [sqlite3_step()] recursively,
** then the changes in the inner, recursive call are counted together
** with the changes in the outer call.
**
** SQLite implements the command "DELETE FROM table" without a WHERE clause
** by dropping and recreating the table.  (This is much faster than going
** through and deleting individual elements from the table.)  Because of
** this optimization, the change count for "DELETE FROM table" will be
** zero regardless of the number of elements that were originally in the



** table. To get an accurate count of the number of rows deleted, use
** "DELETE FROM table WHERE 1" instead.














*/
int sqlite3_changes(sqlite3*);

/*
** CAPI3REF: Total Number Of Rows Modified
***
** This function returns the number of database rows that have been
** modified by INSERT, UPDATE or DELETE statements since the database handle
** was opened. This includes UPDATE, INSERT and DELETE statements executed
** as part of trigger programs. All changes are counted as soon as the



** statement that makes them is completed (when the statement handle is
** passed to [sqlite3_reset()] or [sqlite_finalise()]).

**
** See also the [sqlite3_change()] interface.
**
** SQLite implements the command "DELETE FROM table" without a WHERE clause
** by dropping and recreating the table.  (This is much faster than going

** through and deleting individual elements form the table.)  Because of
** this optimization, the change count for "DELETE FROM table" will be
** zero regardless of the number of elements that were originally in the
** table. To get an accurate count of the number of rows deleted, use
** "DELETE FROM table WHERE 1" instead.
















*/
int sqlite3_total_changes(sqlite3*);

/*
** CAPI3REF: Interrupt A Long-Running Query
**
** This function causes any pending database operation to abort and
** return at its earliest opportunity.  This routine is typically
** called in response to a user action such as pressing "Cancel"
** or Ctrl-C where the user wants a long query operation to halt
** immediately.
**
** It is safe to call this routine from a thread different from the
** thread that is currently running the database operation.


**



** The SQL operation that is interrupted will return [SQLITE_INTERRUPT].
** If an interrupted operation was an update that is inside an


** explicit transaction, then the entire transaction will be rolled
** back automatically.

















*/
void sqlite3_interrupt(sqlite3*);

/*
** CAPI3REF: Determine If An SQL Statement Is Complete
**
** These functions return true if the given input string comprises
** one or more complete SQL statements. For the sqlite3_complete() call,
** the parameter must be a nul-terminated UTF-8 string. For
** sqlite3_complete16(), a nul-terminated machine byte order UTF-16 string
** is required.
**
** These routines are useful for command-line input to determine if the
** currently entered text forms one or more complete SQL statements or
** if additional input is needed before sending the statements into
** SQLite for parsing. The algorithm is simple.  If the 
** last token other than spaces and comments is a semicolon, then return 
** true.  Actually, the algorithm is a little more complicated than that
** in order to deal with triggers, but the basic idea is the same:  the
** statement is not complete unless it ends in a semicolon.

























*/
int sqlite3_complete(const char *sql);
int sqlite3_complete16(const void *sql);

/*
** CAPI3REF: Register A Callback To Handle SQLITE_BUSY Errors
**
** This routine identifies a callback function that might be invoked
** whenever an attempt is made to open a database table 
** that another thread or process has locked.
** If the busy callback is NULL, then [SQLITE_BUSY]
** (or sometimes [SQLITE_IOERR_BLOCKED])
** is returned immediately upon encountering the lock.
** If the busy callback is not NULL, then the
** callback will be invoked with two arguments.  The
** first argument to the handler is a copy of the void* pointer which
** is the third argument to this routine.  The second argument to
** the handler is the number of times that the busy handler has
** been invoked for this locking event. If the
** busy callback returns 0, then no additional attempts are made to
** access the database and [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED] is returned.
** If the callback returns non-zero, then another attempt is made to open the
** database for reading and the cycle repeats.
**
** The presence of a busy handler does not guarantee that
** it will be invoked when there is lock contention.
** If SQLite determines that invoking the busy handler could result in
** a deadlock, it will return [SQLITE_BUSY] instead.


** Consider a scenario where one process is holding a read lock that
** it is trying to promote to a reserved lock and
** a second process is holding a reserved lock that it is trying
** to promote to an exclusive lock.  The first process cannot proceed
** because it is blocked by the second and the second process cannot
** proceed because it is blocked by the first.  If both processes
** invoke the busy handlers, neither will make any progress.  Therefore,
** SQLite returns [SQLITE_BUSY] for the first process, hoping that this
** will induce the first process to release its read lock and allow
** the second process to proceed.
**
** The default busy callback is NULL.
**
** The [SQLITE_BUSY] error is converted to [SQLITE_IOERR_BLOCKED] when
** SQLite is in the middle of a large transaction where all the
** changes will not fit into the in-memory cache.  SQLite will
** already hold a RESERVED lock on the database file, but it needs
** to promote this lock to EXCLUSIVE so that it can spill cache
** pages into the database file without harm to concurrent
** readers.  If it is unable to promote the lock, then the in-memory
** cache will be left in an inconsistent state and so the error
** code is promoted from the relatively benign [SQLITE_BUSY] to
** the more severe [SQLITE_IOERR_BLOCKED].  This error code promotion
** forces an automatic rollback of the changes. See the
** <a href="http://www.sqlite.org/cvstrac/wiki?p=CorruptionFollowingBusyError">
** CorruptionFollowingBusyError</a> wiki page for a discussion of why
** this is important.
**	
** Sqlite is re-entrant, so the busy handler may start a new query. 
** (It is not clear why anyone would every want to do this, but it
** is allowed, in theory.)  But the busy handler may not close the
** database.  Closing the database from a busy handler will delete 
** data structures out from under the executing query and will 
** probably result in a segmentation fault or other runtime error.
**
** There can only be a single busy handler defined for each database
** connection.  Setting a new busy handler clears any previous one.
** Note that calling [sqlite3_busy_timeout()] will also set or clear
** the busy handler.



























*/
int sqlite3_busy_handler(sqlite3*, int(*)(void*,int), void*);

/*
** CAPI3REF: Set A Busy Timeout
**

** This routine sets a busy handler that sleeps for a while when a
** table is locked.  The handler will sleep multiple times until 
** at least "ms" milliseconds of sleeping have been done.  After
** "ms" milliseconds of sleeping, the handler returns 0 which
** causes [sqlite3_step()] to return [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED].
**
** Calling this routine with an argument less than or equal to zero
** turns off all busy handlers.
**
** There can only be a single busy handler for a particular database
** connection.  If another busy handler was defined  
** (using [sqlite3_busy_handler()]) prior to calling
** this routine, that other busy handler is cleared.
















*/
int sqlite3_busy_timeout(sqlite3*, int ms);

/*
** CAPI3REF: Convenience Routines For Running Queries
**
** This next routine is a convenience wrapper around [sqlite3_exec()].
** Instead of invoking a user-supplied callback for each row of the
** result, this routine remembers each row of the result in memory
** obtained from [sqlite3_malloc()], then returns all of the result after the
** query has finished. 



**
** As an example, suppose the query result where this table:








**



** <pre>




**        Name        | Age
**        -----------------------
**        Alice       | 43
**        Bob         | 28
**        Cindy       | 21
** </pre>
**
** If the 3rd argument were &azResult then after the function returns
** azResult will contain the following data:



**
** <pre>

**        azResult[0] = "Name";
**        azResult[1] = "Age";
**        azResult[2] = "Alice";
**        azResult[3] = "43";
**        azResult[4] = "Bob";
**        azResult[5] = "28";
**        azResult[6] = "Cindy";
**        azResult[7] = "21";
** </pre>
**
** Notice that there is an extra row of data containing the column
** headers.  But the *nrow return value is still 3.  *ncolumn is
** set to 2.  In general, the number of values inserted into azResult
** will be ((*nrow) + 1)*(*ncolumn).




**
** After the calling function has finished using the result, it should 
** pass the result data pointer to sqlite3_free_table() in order to 
** release the memory that was malloc-ed.  Because of the way the 
** [sqlite3_malloc()] happens, the calling function must not try to call 
** [sqlite3_free()] directly.  Only [sqlite3_free_table()] is able to release 
** the memory properly and safely.
**
** The return value of this routine is the same as from [sqlite3_exec()].





























*/
int sqlite3_get_table(
  sqlite3*,              /* An open database */
  const char *sql,       /* SQL to be executed */
  char ***resultp,       /* Result written to a char *[]  that this points to */

  int *nrow,             /* Number of result rows written here */
  int *ncolumn,          /* Number of result columns written here */
  char **errmsg          /* Error msg written here */
);
void sqlite3_free_table(char **result);

/*
** CAPI3REF: Formatted String Printing Functions
**
** These routines are workalikes of the "printf()" family of functions
** from the standard C library.
**
** The sqlite3_mprintf() and sqlite3_vmprintf() routines write their
** results into memory obtained from [sqlite_malloc()].
** The strings returned by these two routines should be
** released by [sqlite3_free()].  Both routines return a
** NULL pointer if [sqlite3_malloc()] is unable to allocate enough
** memory to hold the resulting string.
**
** In sqlite3_snprintf() routine is similar to "snprintf()" from
** the standard C library.  The result is written into the
** buffer supplied as the second parameter whose size is given by
** the first parameter.  Note that the order of the
** first two parameters is reversed from snprintf().  This is an
** historical accident that cannot be fixed without breaking
** backwards compatibility.  Note also that sqlite3_snprintf()
** returns a pointer to its buffer instead of the number of
** characters actually written into the buffer.  We admit that
** the number of characters written would be a more useful return
** value but we cannot change the implementation of sqlite3_snprintf()
................................................................................
** parameter "n" is the total size of the buffer, including space for
** the zero terminator.  So the longest string that can be completely
** written will be n-1 characters.
**
** These routines all implement some additional formatting
** options that are useful for constructing SQL statements.
** All of the usual printf formatting options apply.  In addition, there
** is are "%q" and "%Q" options.
**
** The %q option works like %s in that it substitutes a null-terminated
** string from the argument list.  But %q also doubles every '\'' character.
** %q is designed for use inside a string literal.  By doubling each '\''
** character it escapes that character and allows it to be inserted into
** the string.
**
................................................................................
** This second example is an SQL syntax error.  As a general rule you
** should always use %q instead of %s when inserting text into a string 
** literal.
**
** The %Q option works like %q except it also adds single quotes around
** the outside of the total string.  Or if the parameter in the argument
** list is a NULL pointer, %Q substitutes the text "NULL" (without single
** quotes) in place of the %Q option.  So, for example, one could say:
**
** <blockquote><pre>
**  char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES(%Q)", zText);
**  sqlite3_exec(db, zSQL, 0, 0, 0);
**  sqlite3_free(zSQL);
** </pre></blockquote>
**
** The code above will render a correct SQL statement in the zSQL
** variable even if the zText variable is a NULL pointer.






















*/
char *sqlite3_mprintf(const char*,...);
char *sqlite3_vmprintf(const char*, va_list);
char *sqlite3_snprintf(int,char*,const char*, ...);

/*
** CAPI3REF: Memory Allocation Functions
**
** SQLite uses its own memory allocator.  On some installations, this
** memory allocator is identical to the standard malloc()/realloc()/free()
** and can be used interchangable.  On others, the implementations are
** different.  For maximum portability, it is best not to mix calls
** to the standard malloc/realloc/free with the sqlite versions.
























































































































*/
void *sqlite3_malloc(int);
void *sqlite3_realloc(void*, int);
void sqlite3_free(void*);

/*
































** CAPI3REF: Compile-Time Authorization Callbacks
***
** This routine registers a authorizer callback with the SQLite library.  

** The authorizer callback is invoked as SQL statements are being compiled
** by [sqlite3_prepare()] or its variants [sqlite3_prepare_v2()],
** [sqlite3_prepare16()] and [sqlite3_prepare16_v2()].  At various
** points during the compilation process, as logic is being created
** to perform various actions, the authorizer callback is invoked to
** see if those actions are allowed.  The authorizer callback should
** return SQLITE_OK to allow the action, [SQLITE_IGNORE] to disallow the
** specific action but allow the SQL statement to continue to be
** compiled, or [SQLITE_DENY] to cause the entire SQL statement to be
** rejected with an error.  



**
** Depending on the action, the [SQLITE_IGNORE] and [SQLITE_DENY] return
** codes might mean something different or they might mean the same
** thing.  If the action is, for example, to perform a delete opertion,
** then [SQLITE_IGNORE] and [SQLITE_DENY] both cause the statement compilation
** to fail with an error.  But if the action is to read a specific column
** from a specific table, then [SQLITE_DENY] will cause the entire
** statement to fail but [SQLITE_IGNORE] will cause a NULL value to be
** read instead of the actual column value.






**
** The first parameter to the authorizer callback is a copy of
** the third parameter to the sqlite3_set_authorizer() interface.
** The second parameter to the callback is an integer 
** [SQLITE_COPY | action code] that specifies the particular action
** to be authorized.  The available action codes are
** [SQLITE_COPY | documented separately].  The third through sixth
** parameters to the callback are strings that contain additional
** details about the action to be authorized.
**
** An authorizer is used when preparing SQL statements from an untrusted
** source, to ensure that the SQL statements do not try to access data
** that they are not allowed to see, or that they do not try to
** execute malicious statements that damage the database.  For
** example, an application may allow a user to enter arbitrary
** SQL queries for evaluation by a database.  But the application does
................................................................................
** not want the user to be able to make arbitrary changes to the
** database.  An authorizer could then be put in place while the
** user-entered SQL is being prepared that disallows everything
** except SELECT statements.  
**
** Only a single authorizer can be in place on a database connection
** at a time.  Each call to sqlite3_set_authorizer overrides the
** previous call.  A NULL authorizer means that no authorization
** callback is invoked.  The default authorizer is NULL.
**
** Note that the authorizer callback is invoked only during 
** [sqlite3_prepare()] or its variants.  Authorization is not
** performed during statement evaluation in [sqlite3_step()].




















































*/
int sqlite3_set_authorizer(
  sqlite3*,
  int (*xAuth)(void*,int,const char*,const char*,const char*,const char*),
  void *pUserData
);

/*
** CAPI3REF: Authorizer Return Codes
**
** The [sqlite3_set_authorizer | authorizer callback function] must
** return either [SQLITE_OK] or one of these two constants in order
** to signal SQLite whether or not the action is permitted.  See the
** [sqlite3_set_authorizer | authorizer documentation] for additional
** information.
*/
#define SQLITE_DENY   1   /* Abort the SQL statement with an error */
#define SQLITE_IGNORE 2   /* Don't allow access, but don't generate an error */

/*
** CAPI3REF: Authorizer Action Codes
**
** The [sqlite3_set_authorizer()] interface registers a callback function
** that is invoked to authorizer certain SQL statement actions.  The
** second parameter to the callback is an integer code that specifies
** what action is being authorized.  These are the integer action codes that
** the authorizer callback may be passed.
**
** These action code values signify what kind of operation is to be 
** authorized.  The 3rd and 4th parameters to the authorization callback
** function will be parameters or NULL depending on which of these
** codes is used as the second parameter.  The 5th parameter to the
** authorizer callback is the name of the database ("main", "temp", 
** etc.) if applicable.  The 6th parameter to the authorizer callback
** is the name of the inner-most trigger or view that is responsible for
** the access attempt or NULL if this access attempt is directly from 
** top-level SQL code.






















*/
/******************************************* 3rd ************ 4th ***********/
#define SQLITE_CREATE_INDEX          1   /* Index Name      Table Name      */
#define SQLITE_CREATE_TABLE          2   /* Table Name      NULL            */
#define SQLITE_CREATE_TEMP_INDEX     3   /* Index Name      Table Name      */
#define SQLITE_CREATE_TEMP_TABLE     4   /* Table Name      NULL            */
#define SQLITE_CREATE_TEMP_TRIGGER   5   /* Trigger Name    Table Name      */
................................................................................
#define SQLITE_ANALYZE              28   /* Table Name      NULL            */
#define SQLITE_CREATE_VTABLE        29   /* Table Name      Module Name     */
#define SQLITE_DROP_VTABLE          30   /* Table Name      Module Name     */
#define SQLITE_FUNCTION             31   /* Function Name   NULL            */
#define SQLITE_COPY                  0   /* No longer used */

/*
** CAPI3REF: Tracing And Profiling Functions
**
** These routines register callback functions that can be used for
** tracing and profiling the execution of SQL statements.

** The callback function registered by sqlite3_trace() is invoked
** at the first [sqlite3_step()] for the evaluation of an SQL statement.






** The callback function registered by sqlite3_profile() is invoked
** as each SQL statement finishes and includes

** information on how long that statement ran.
**
** The sqlite3_profile() API is currently considered experimental and
** is subject to change.








































*/
void *sqlite3_trace(sqlite3*, void(*xTrace)(void*,const char*), void*);
void *sqlite3_profile(sqlite3*,
   void(*xProfile)(void*,const char*,sqlite_uint64), void*);

/*
** CAPI3REF: Query Progress Callbacks
**
** This routine configures a callback function - the progress callback - that

** is invoked periodically during long running calls to [sqlite3_exec()],
** [sqlite3_step()] and [sqlite3_get_table()].  An example use for this 
** interface is to keep a GUI updated during a large query.
**










** The progress callback is invoked once for every N virtual machine opcodes,
** where N is the second argument to this function. The progress callback



** itself is identified by the third argument to this function. The fourth



** argument to this function is a void pointer passed to the progress callback
** function each time it is invoked.
**
** If a call to [sqlite3_exec()], [sqlite3_step()], or [sqlite3_get_table()]

** results in fewer than N opcodes being executed, then the progress 
** callback is never invoked.
** 
** Only a single progress callback function may be registered for each
** open database connection.  Every call to sqlite3_progress_handler()
** overwrites the results of the previous call.
** To remove the progress callback altogether, pass NULL as the third
** argument to this function.

**



** If the progress callback returns a result other than 0, then the current 
** query is immediately terminated and any database changes rolled back.
** The containing [sqlite3_exec()], [sqlite3_step()], or
** [sqlite3_get_table()] call returns SQLITE_INTERRUPT.   This feature
** can be used, for example, to implement the "Cancel" button on a
** progress dialog box in a GUI.

*/
void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);

/*
** CAPI3REF: Opening A New Database Connection
**
** Open the sqlite database file "filename".  The "filename" is UTF-8



** encoded for sqlite3_open() and UTF-16 encoded in the native byte order
** for sqlite3_open16().  An [sqlite3*] handle is returned in *ppDb, even



** if an error occurs. If the database is opened (or created) successfully,

** then SQLITE_OK is returned. Otherwise an error code is returned. The
** sqlite3_errmsg() or sqlite3_errmsg16()  routines can be used to obtain
** an English language description of the error.
**
** If the database file does not exist, then a new database will be created
** as needed.  The default encoding for the database will be UTF-8 if
** sqlite3_open() is called and UTF-16 if sqlite3_open16 is used.


**
** Whether or not an error occurs when it is opened, resources associated
** with the [sqlite3*] handle should be released by passing it to
** sqlite3_close() when it is no longer required.
**









































** Note to windows users:  The encoding used for the filename argument
** of sqlite3_open() must be UTF-8, not whatever codepage is currently
** defined.  Filenames containing international characters must be converted
** to UTF-8 prior to passing them into sqlite3_open().
































































*/
int sqlite3_open(
  const char *filename,   /* Database filename (UTF-8) */
  sqlite3 **ppDb          /* OUT: SQLite db handle */
);
int sqlite3_open16(
  const void *filename,   /* Database filename (UTF-16) */
  sqlite3 **ppDb          /* OUT: SQLite db handle */
);







/*
** CAPI3REF: Error Codes And Messages
**
** The sqlite3_errcode() interface returns the numeric
** [SQLITE_OK | result code] or [SQLITE_IOERR_READ | extended result code]
** for the most recent failed sqlite3_* API call associated
** with [sqlite3] handle 'db'.  If a prior API call failed but the
** most recent API call succeeded, the return value from sqlite3_errcode()
** is undefined. 
**
** The sqlite3_errmsg() and sqlite3_errmsg16() return English-langauge
** text that describes the error, as either UTF8 or UTF16 respectively.
** Memory to hold the error message string is managed internally.  The 

** string may be overwritten or deallocated by subsequent calls to SQLite
** interface functions.
**
** Calls to many sqlite3_* functions set the error code and string returned










** by [sqlite3_errcode()], [sqlite3_errmsg()], and [sqlite3_errmsg16()]









** (overwriting the previous values). Note that calls to [sqlite3_errcode()],
** [sqlite3_errmsg()], and [sqlite3_errmsg16()] themselves do not affect the


** results of future invocations.  Calls to API routines that do not return
** an error code (examples: [sqlite3_data_count()] or [sqlite3_mprintf()]) do
** not change the error code returned by this routine.

**
** Assuming no other intervening sqlite3_* API calls are made, the error
** code returned by this function is associated with the same error as
** the strings returned by [sqlite3_errmsg()] and [sqlite3_errmsg16()].





*/
int sqlite3_errcode(sqlite3 *db);
const char *sqlite3_errmsg(sqlite3*);
const void *sqlite3_errmsg16(sqlite3*);

/*
** CAPI3REF: SQL Statement Object

**
** Instance of this object represent single SQL statements.  This
** is variously known as a "prepared statement" or a 
** "compiled SQL statement" or simply as a "statement".
** 
** The life of a statement object goes something like this:
**
** <ol>
** <li> Create the object using [sqlite3_prepare_v2()] or a related
**      function.
................................................................................
**
** Refer to documentation on individual methods above for additional
** information.
*/
typedef struct sqlite3_stmt sqlite3_stmt;

/*
** CAPI3REF: Compiling An SQL Statement
**
** To execute an SQL query, it must first be compiled into a byte-code
** program using one of these routines. 
**
** The first argument "db" is an [sqlite3 | SQLite database handle] 
** obtained from a prior call to [sqlite3_open()] or [sqlite3_open16()].

** The second argument "zSql" is the statement to be compiled, encoded
** as either UTF-8 or UTF-16.  The sqlite3_prepare() and sqlite3_prepare_v2()
** interfaces uses UTF-8 and sqlite3_prepare16() and sqlite3_prepare16_v2()
** use UTF-16.
**
** If the nByte argument is less
** than zero, then zSql is read up to the first zero terminator.  If
** nByte is non-negative, then it is the maximum number of 
** bytes read from zSql.  When nByte is non-negative, the
** zSql string ends at either the first '\000' character or 
** until the nByte-th byte, whichever comes first.
**
** *pzTail is made to point to the first byte past the end of the first
** SQL statement in zSql.  This routine only compiles the first statement
** in zSql, so *pzTail is left pointing to what remains uncompiled.

**
** *ppStmt is left pointing to a compiled 
** [sqlite3_stmt | SQL statement structure] that can be
** executed using [sqlite3_step()].  Or if there is an error, *ppStmt may be
** set to NULL.  If the input text contained no SQL (if the input is and
** empty string or a comment) then *ppStmt is set to NULL.  The calling
** procedure is responsible for deleting the compiled SQL statement

** using [sqlite3_finalize()] after it has finished with it.
**
** On success, [SQLITE_OK] is returned.  Otherwise an 
** [SQLITE_ERROR | error code] is returned.
**
** The sqlite3_prepare_v2() and sqlite3_prepare16_v2() interfaces are
** recommended for all new programs. The two older interfaces are retained
** for backwards compatibility, but their use is discouraged.
** In the "v2" interfaces, the prepared statement
** that is returned (the [sqlite3_stmt] object) contains a copy of the 
** original SQL text. This causes the [sqlite3_step()] interface to
** behave a differently in two ways:
**
** <ol>
** <li>
** If the database schema changes, instead of returning [SQLITE_SCHEMA] as it
** always used to do, [sqlite3_step()] will automatically recompile the SQL
** statement and try to run it again.  If the schema has changed in a way
** that makes the statement no longer valid, [sqlite3_step()] will still
** return [SQLITE_SCHEMA].  But unlike the legacy behavior, [SQLITE_SCHEMA] is

** now a fatal error.  Calling [sqlite3_prepare_v2()] again will not make the
** error go away.  Note: use [sqlite3_errmsg()] to find the text of the parsing
** error that results in an [SQLITE_SCHEMA] return.
** </li>
**
** <li>
** When an error occurs, 
** [sqlite3_step()] will return one of the detailed 
** [SQLITE_ERROR | result codes] or
** [SQLITE_IOERR_READ | extended result codes] such as directly.
** The legacy behavior was that [sqlite3_step()] would only return a generic
** [SQLITE_ERROR] result code and you would have to make a second call to
** [sqlite3_reset()] in order to find the underlying cause of the problem.
** With the "v2" prepare interfaces, the underlying reason for the error is
** returned immediately.
** </li>
** </ol>
































*/
int sqlite3_prepare(
  sqlite3 *db,            /* Database handle */
  const char *zSql,       /* SQL statement, UTF-8 encoded */
  int nByte,              /* Maximum length of zSql in bytes. */
  sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
  const char **pzTail     /* OUT: Pointer to unused portion of zSql */
................................................................................
  const void *zSql,       /* SQL statement, UTF-16 encoded */
  int nByte,              /* Maximum length of zSql in bytes. */
  sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
  const void **pzTail     /* OUT: Pointer to unused portion of zSql */
);

/*



























** CAPI3REF:  Dynamically Typed Value Object
**


** SQLite uses dynamic typing for the values it stores.  Values can 

** be integers, floating point values, strings, BLOBs, or NULL.  When
** passing around values internally, each value is represented as
** an instance of the sqlite3_value object.
*/
typedef struct Mem sqlite3_value;

/*
** CAPI3REF:  SQL Function Context Object
**
** The context in which an SQL function executes is stored in an
** sqlite3_context object.  A pointer to such an object is the
** first parameter to user-defined SQL functions.
*/
typedef struct sqlite3_context sqlite3_context;

/*
** CAPI3REF:  Binding Values To Prepared Statements
**
** In the SQL strings input to [sqlite3_prepare_v2()] and its variants,
** one or more literals can be replace by a parameter in one of these
** forms:
**
** <ul>
** <li>  ?
** <li>  ?NNN
** <li>  :AAA
** <li>  @AAA
** <li>  $VVV
** </ul>
**
** In the parameter forms shown above NNN is an integer literal,
** AAA is an alphanumeric identifier and VVV is a variable name according
** to the syntax rules of the TCL programming language.
** The values of these parameters (also called "host parameter names")

** can be set using the sqlite3_bind_*() routines defined here.
**
** The first argument to the sqlite3_bind_*() routines always is a pointer
** to the [sqlite3_stmt] object returned from [sqlite3_prepare_v2()] or
** its variants.  The second
** argument is the index of the parameter to be set.  The first parameter has

** an index of 1. When the same named parameter is used more than once, second
** and subsequent
** occurrences have the same index as the first occurrence.  The index for
** named parameters can be looked up using the
** [sqlite3_bind_parameter_name()] API if desired.  The index for "?NNN"
** parametes is the value of NNN.
** The NNN value must be between 1 and the compile-time
** parameter SQLITE_MAX_VARIABLE_NUMBER (default value: 999).
** See <a href="limits.html">limits.html</a> for additional information.
**
** The third argument is the value to bind to the parameter.
**
** In those
** routines that have a fourth argument, its value is the number of bytes
** in the parameter.  To be clear: the value is the number of bytes in the
** string, not the number of characters.  The number
** of bytes does not include the zero-terminator at the end of strings.
** If the fourth parameter is negative, the length of the string is
** number of bytes up to the first zero terminator.
**
** The fifth argument to sqlite3_bind_blob(), sqlite3_bind_text(), and
** sqlite3_bind_text16() is a destructor used to dispose of the BLOB or
** text after SQLite has finished with it.  If the fifth argument is the
** special value [SQLITE_STATIC], then the library assumes that the information
** is in static, unmanaged space and does not need to be freed.  If the
** fifth argument has the value [SQLITE_TRANSIENT], then SQLite makes its
** own private copy of the data immediately, before the sqlite3_bind_*()
** routine returns.
**
** The sqlite3_bind_zeroblob() routine binds a BLOB of length n that
** is filled with zeros.  A zeroblob uses a fixed amount of memory
** (just an integer to hold it size) while it is being processed.
** Zeroblobs are intended to serve as place-holders for BLOBs whose
** content is later written using 
** [sqlite3_blob_open | increment BLOB I/O] routines.

**
** The sqlite3_bind_*() routines must be called after
** [sqlite3_prepare_v2()] (and its variants) or [sqlite3_reset()] and
** before [sqlite3_step()].
** Bindings are not cleared by the [sqlite3_reset()] routine.
** Unbound parameters are interpreted as NULL.
**
** These routines return [SQLITE_OK] on success or an error code if
** anything goes wrong.  [SQLITE_RANGE] is returned if the parameter
** index is out of range.  [SQLITE_NOMEM] is returned if malloc fails.
** [SQLITE_MISUSE] is returned if these routines are called on a virtual
** machine that is the wrong state or which has already been finalized.













































































*/
int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*));
int sqlite3_bind_double(sqlite3_stmt*, int, double);
int sqlite3_bind_int(sqlite3_stmt*, int, int);
int sqlite3_bind_int64(sqlite3_stmt*, int, sqlite_int64);
int sqlite3_bind_null(sqlite3_stmt*, int);
int sqlite3_bind_text(sqlite3_stmt*, int, const char*, int n, void(*)(void*));
int sqlite3_bind_text16(sqlite3_stmt*, int, const void*, int, void(*)(void*));
int sqlite3_bind_value(sqlite3_stmt*, int, const sqlite3_value*);
int sqlite3_bind_zeroblob(sqlite3_stmt*, int, int n);

/*
** CAPI3REF: Number Of Host Parameters
**
** Return the largest host parameter index in the precompiled statement given
** as the argument.  When the host parameters are of the forms like ":AAA"
** or "?", then they are assigned sequential increasing numbers beginning
** with one, so the value returned is the number of parameters.  However
** if the same host parameter name is used multiple times, each occurrance
** is given the same number, so the value returned in that case is the number
** of unique host parameter names.  If host parameters of the form "?NNN"
** are used (where NNN is an integer) then there might be gaps in the
** numbering and the value returned by this interface is the index of the
** host parameter with the largest index value.











*/
int sqlite3_bind_parameter_count(sqlite3_stmt*);

/*
** CAPI3REF: Name Of A Host Parameter
**
** This routine returns a pointer to the name of the n-th parameter in a 
** [sqlite3_stmt | prepared statement].

** Host parameters of the form ":AAA" or "@AAA" or "$VVV" have a name
** which is the string ":AAA" or "@AAA" or "$VVV".  
** In other words, the initial ":" or "$" or "@"
** is included as part of the name.
** Parameters of the form "?" or "?NNN" have no name.
**
** The first bound parameter has an index of 1, not 0.
**
** If the value n is out of range or if the n-th parameter is nameless,
** then NULL is returned.  The returned string is always in the
** UTF-8 encoding even if the named parameter was originally specified

** as UTF-16 in [sqlite3_prepare16()] or [sqlite3_prepare16_v2()].













*/
const char *sqlite3_bind_parameter_name(sqlite3_stmt*, int);

/*
** CAPI3REF: Index Of A Parameter With A Given Name
**
** This routine returns the index of a host parameter with the given name.
** The name must match exactly.  If no parameter with the given name is 
** found, return 0.  Parameter names must be UTF8.














*/
int sqlite3_bind_parameter_index(sqlite3_stmt*, const char *zName);

/*
** CAPI3REF: Reset All Bindings On A Prepared Statement
**
** Contrary to the intuition of many, [sqlite3_reset()] does not
** reset the [sqlite3_bind_blob | bindings] on a 
** [sqlite3_stmt | prepared statement].  Use this routine to
** reset all host parameters to NULL.






*/
int sqlite3_clear_bindings(sqlite3_stmt*);

/*
** CAPI3REF: Number Of Columns In A Result Set
**
** Return the number of columns in the result set returned by the 
** [sqlite3_stmt | compiled SQL statement]. This routine returns 0
** if pStmt is an SQL statement that does not return data (for 
** example an UPDATE).







*/
int sqlite3_column_count(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Column Names In A Result Set
**
** These routines return the name assigned to a particular column
** in the result set of a SELECT statement.  The sqlite3_column_name()
** interface returns a pointer to a UTF8 string and sqlite3_column_name16()

** returns a pointer to a UTF16 string.  The first parameter is the
** [sqlite_stmt | prepared statement] that implements the SELECT statement.
** The second parameter is the column number.  The left-most column is
** number 0.
**
** The returned string pointer is valid until either the 
** [sqlite_stmt | prepared statement] is destroyed by [sqlite3_finalize()]
** or until the next call sqlite3_column_name() or sqlite3_column_name16()
** on the same column.








































*/
const char *sqlite3_column_name(sqlite3_stmt*, int N);
const void *sqlite3_column_name16(sqlite3_stmt*, int N);

/*
** CAPI3REF: Source Of Data In A Query Result
**
** These routines provide a means to determine what column of what
** table in which database a result of a SELECT statement comes from.
** The name of the database or table or column can be returned as
** either a UTF8 or UTF16 string.  The _database_ routines return
** the database name, the _table_ routines return the table name, and
** the origin_ routines return the column name.
** The returned string is valid until
** the [sqlite3_stmt | prepared statement] is destroyed using
** [sqlite3_finalize()] or until the same information is requested
** again in a different encoding.
**
** The names returned are the original un-aliased names of the
** database, table, and column.
**
** The first argument to the following calls is a 
** [sqlite3_stmt | compiled SQL statement].
** These functions return information about the Nth column returned by 
** the statement, where N is the second function argument.
**
** If the Nth column returned by the statement is an expression
** or subquery and is not a column value, then all of these functions

** return NULL. Otherwise, they return the 
** name of the attached database, table and column that query result
** column was extracted from.
**
** As with all other SQLite APIs, those postfixed with "16" return UTF-16
** encoded strings, the other functions return UTF-8.
**
** These APIs are only available if the library was compiled with the 
** SQLITE_ENABLE_COLUMN_METADATA preprocessor symbol defined.


































































*/
const char *sqlite3_column_database_name(sqlite3_stmt*,int);
const void *sqlite3_column_database_name16(sqlite3_stmt*,int);
const char *sqlite3_column_table_name(sqlite3_stmt*,int);
const void *sqlite3_column_table_name16(sqlite3_stmt*,int);
const char *sqlite3_column_origin_name(sqlite3_stmt*,int);
const void *sqlite3_column_origin_name16(sqlite3_stmt*,int);

/*
** CAPI3REF: Declared Datatype Of A Query Result
**
** The first parameter is a [sqlite3_stmt | compiled SQL statement]. 
** If this statement is a SELECT statement and the Nth column of the 
** returned result set  of that SELECT is a table column (not an
** expression or subquery) then the declared type of the table
** column is returned. If the Nth column of the result set is an
** expression or subquery, then a NULL pointer is returned.
** The returned string is always UTF-8 encoded. For example, in
** the database schema:
**
** CREATE TABLE t1(c1 VARIANT);
**
** And the following statement compiled:
**
** SELECT c1 + 1, c1 FROM t1;
**
................................................................................
**
** SQLite uses dynamic run-time typing.  So just because a column
** is declared to contain a particular type does not mean that the
** data stored in that column is of the declared type.  SQLite is
** strongly typed, but the typing is dynamic not static.  Type
** is associated with individual values, not with the containers
** used to hold those values.






















*/
const char *sqlite3_column_decltype(sqlite3_stmt *, int i);
const void *sqlite3_column_decltype16(sqlite3_stmt*,int);

/* 
** CAPI3REF:  Evaluate An SQL Statement
**
** After an [sqlite3_stmt | SQL statement] has been prepared with a call
** to either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] or to one of
** the legacy interfaces [sqlite3_prepare()] or [sqlite3_prepare16()],
** then this function must be called one or more times to evaluate the 
** statement.
**
** The details of the behavior of this sqlite3_step() interface depend
** on whether the statement was prepared using the newer "v2" interface
................................................................................
** 
** [SQLITE_ERROR] means that a run-time error (such as a constraint
** violation) has occurred.  sqlite3_step() should not be called again on
** the VM. More information may be found by calling [sqlite3_errmsg()].
** With the legacy interface, a more specific error code (example:
** [SQLITE_INTERRUPT], [SQLITE_SCHEMA], [SQLITE_CORRUPT], and so forth)
** can be obtained by calling [sqlite3_reset()] on the
** [sqlite_stmt | prepared statement].  In the "v2" interface,
** the more specific error code is returned directly by sqlite3_step().
**
** [SQLITE_MISUSE] means that the this routine was called inappropriately.
** Perhaps it was called on a [sqlite_stmt | prepared statement] that has
** already been [sqlite3_finalize | finalized] or on one that had 
** previously returned [SQLITE_ERROR] or [SQLITE_DONE].  Or it could
** be the case that the same database connection is being used by two or
** more threads at the same moment in time.
**
** <b>Goofy Interface Alert:</b>
** In the legacy interface, 
** the sqlite3_step() API always returns a generic error code,
** [SQLITE_ERROR], following any error other than [SQLITE_BUSY]
** and [SQLITE_MISUSE].  You must call [sqlite3_reset()] or
** [sqlite3_finalize()] in order to find one of the specific
** [SQLITE_ERROR | result codes] that better describes the error.
** We admit that this is a goofy design.  The problem has been fixed
** with the "v2" interface.  If you prepare all of your SQL statements
** using either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] instead
** of the legacy [sqlite3_prepare()] and [sqlite3_prepare16()], then the 
** more specific [SQLITE_ERROR | result codes] are returned directly
** by sqlite3_step().  The use of the "v2" interface is recommended.



























*/
int sqlite3_step(sqlite3_stmt*);

/*
** CAPI3REF:
**
** Return the number of values in the current row of the result set.
**


** After a call to [sqlite3_step()] that returns [SQLITE_ROW], this routine

** will return the same value as the [sqlite3_column_count()] function.
** After [sqlite3_step()] has returned an [SQLITE_DONE], [SQLITE_BUSY], or



** a [SQLITE_ERROR | error code], or before [sqlite3_step()] has been 
** called on the [sqlite_stmt | prepared statement] for the first time,


** this routine returns zero.
*/
int sqlite3_data_count(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Fundamental Datatypes

**
** Every value in SQLite has one of five fundamental datatypes:
**
** <ul>
** <li> 64-bit signed integer
** <li> 64-bit IEEE floating point number
** <li> string
** <li> BLOB
** <li> NULL
** </ul>
**
** These constants are codes for each of those types.
**
** Note that the SQLITE_TEXT constant was also used in SQLite version 2
** for a completely different meaning.  Software that links against both
** SQLite version 2 and SQLite version 3 should use SQLITE3_TEXT not
** SQLITE_TEXT.
................................................................................
# undef SQLITE_TEXT
#else
# define SQLITE_TEXT     3
#endif
#define SQLITE3_TEXT     3

/*
** CAPI3REF: Results Values From A Query
**


** These routines return information about the information
** in a single column of the current result row of a query.  In every
** case the first argument is a pointer to the 
** [sqlite3_stmt | SQL statement] that is being
** evaluate (the [sqlite_stmt*] that was returned from 
** [sqlite3_prepare_v2()] or one of its variants) and
** the second argument is the index of the column for which information 
** should be returned.  The left-most column has an index of 0.

**
** If the SQL statement is not currently point to a valid row, or if the
** the column index is out of range, the result is undefined.









**
** The sqlite3_column_type() routine returns 
** [SQLITE_INTEGER | datatype code] for the initial data type
** of the result column.  The returned value is one of [SQLITE_INTEGER],
** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL].  The value
** returned by sqlite3_column_type() is only meaningful if no type
** conversions have occurred as described below.  After a type conversion,
................................................................................
** the string to UTF-8 and then returns the number of bytes.
** If the result is a numeric value then sqlite3_column_bytes() uses
** [sqlite3_snprintf()] to convert that value to a UTF-8 string and returns
** the number of bytes in that string.
** The value returned does not include the zero terminator at the end
** of the string.  For clarity: the value returned is the number of
** bytes in the string, not the number of characters.
**





** The sqlite3_column_bytes16() routine is similar to sqlite3_column_bytes()
** but leaves the result in UTF-16 instead of UTF-8.  
** The zero terminator is not included in this count.
**
** These routines attempt to convert the value where appropriate.  For
** example, if the internal representation is FLOAT and a text result
** is requested, [sqlite3_snprintf()] is used internally to do the conversion
** automatically.  The following table details the conversions that
** are applied:
**
** <blockquote>
** <table border="1">
** <tr><th> Internal <th> Requested <th> 
** <tr><th>  Type    <th>    Type   <th> Conversion
**
** <tr><td>  NULL    <td> INTEGER   <td> Result is 0
** <tr><td>  NULL    <td>  FLOAT    <td> Result is 0.0
** <tr><td>  NULL    <td>   TEXT    <td> Result is NULL pointer
** <tr><td>  NULL    <td>   BLOB    <td> Result is NULL pointer
** <tr><td> INTEGER  <td>  FLOAT    <td> Convert from integer to float
** <tr><td> INTEGER  <td>   TEXT    <td> ASCII rendering of the integer
................................................................................
**
** In other words, you should call sqlite3_column_text(), sqlite3_column_blob(),
** or sqlite3_column_text16() first to force the result into the desired
** format, then invoke sqlite3_column_bytes() or sqlite3_column_bytes16() to
** find the size of the result.  Do not mix call to sqlite3_column_text() or
** sqlite3_column_blob() with calls to sqlite3_column_bytes16().  And do not
** mix calls to sqlite3_column_text16() with calls to sqlite3_column_bytes().




































































*/
const void *sqlite3_column_blob(sqlite3_stmt*, int iCol);
int sqlite3_column_bytes(sqlite3_stmt*, int iCol);
int sqlite3_column_bytes16(sqlite3_stmt*, int iCol);
double sqlite3_column_double(sqlite3_stmt*, int iCol);
int sqlite3_column_int(sqlite3_stmt*, int iCol);
sqlite_int64 sqlite3_column_int64(sqlite3_stmt*, int iCol);
const unsigned char *sqlite3_column_text(sqlite3_stmt*, int iCol);
const void *sqlite3_column_text16(sqlite3_stmt*, int iCol);
int sqlite3_column_type(sqlite3_stmt*, int iCol);
sqlite3_value *sqlite3_column_value(sqlite3_stmt*, int iCol);

/*
** CAPI3REF: Destroy A Prepared Statement Object
**
** The sqlite3_finalize() function is called to delete a 
** [sqlite3_stmt | compiled SQL statement]. If the statement was
** executed successfully, or not executed at all, then SQLITE_OK is returned.
** If execution of the statement failed then an 
** [SQLITE_ERROR | error code] or [SQLITE_IOERR_READ | extended error code]
** is returned. 
**
** This routine can be called at any point during the execution of the
** [sqlite3_stmt | virtual machine].  If the virtual machine has not 
** completed execution when this routine is called, that is like
** encountering an error or an interrupt.  (See [sqlite3_interrupt()].) 
** Incomplete updates may be rolled back and transactions cancelled,  
** depending on the circumstances, and the 
** [SQLITE_ERROR | result code] returned will be [SQLITE_ABORT].










*/
int sqlite3_finalize(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Reset A Prepared Statement Object
**
** The sqlite3_reset() function is called to reset a 
** [sqlite_stmt | compiled SQL statement] object.
** back to it's initial state, ready to be re-executed.
** Any SQL statement variables that had values bound to them using
** the [sqlite3_bind_blob | sqlite3_bind_*() API] retain their values.
** Use [sqlite3_clear_bindings()] to reset the bindings.















*/
int sqlite3_reset(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Create Or Redefine SQL Functions

**

** The following two functions are used to add SQL functions or aggregates
** or to redefine the behavior of existing SQL functions or aggregates.  The
** difference only between the two is that the second parameter, the
** name of the (scalar) function or aggregate, is encoded in UTF-8 for
** sqlite3_create_function() and UTF-16 for sqlite3_create_function16().
**
** The first argument is the [sqlite3 | database handle] that holds the
** SQL function or aggregate is to be added or redefined. If a single
** program uses more than one database handle internally, then SQL
** functions or aggregates must be added individually to each database
** handle with which they will be used.
**
** The second parameter is the name of the SQL function to be created
** or redefined.
................................................................................
** aggregate may take any number of arguments.
**
** The fourth parameter, eTextRep, specifies what 
** [SQLITE_UTF8 | text encoding] this SQL function prefers for
** its parameters.  Any SQL function implementation should be able to work
** work with UTF-8, UTF-16le, or UTF-16be.  But some implementations may be
** more efficient with one encoding than another.  It is allowed to
** invoke sqlite_create_function() or sqlite3_create_function16() multiple
** times with the same function but with different values of eTextRep.
** When multiple implementations of the same function are available, SQLite
** will pick the one that involves the least amount of data conversion.
** If there is only a single implementation which does not care what
** text encoding is used, then the fourth argument should be
** [SQLITE_ANY].
**
** The fifth parameter is an arbitrary pointer.  The implementation
** of the function can gain access to this pointer using
** [sqlite_user_data()].
**
** The seventh, eighth and ninth parameters, xFunc, xStep and xFinal, are
** pointers to C-language functions that implement the SQL
** function or aggregate. A scalar SQL function requires an implementation of
** the xFunc callback only, NULL pointers should be passed as the xStep
** and xFinal parameters. An aggregate SQL function requires an implementation
** of xStep and xFinal and NULL should be passed for xFunc. To delete an
................................................................................
** callback.
**
** It is permitted to register multiple implementations of the same
** functions with the same name but with either differing numbers of
** arguments or differing perferred text encodings.  SQLite will use
** the implementation most closely matches the way in which the
** SQL function is used.










*/
int sqlite3_create_function(
  sqlite3 *,
  const char *zFunctionName,
  int nArg,
  int eTextRep,
  void*,
  void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
  void (*xFinal)(sqlite3_context*)
);
int sqlite3_create_function16(
  sqlite3*,
  const void *zFunctionName,
  int nArg,
  int eTextRep,
  void*,
  void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
  void (*xFinal)(sqlite3_context*)
);

/*
** CAPI3REF: Text Encodings
**
** These constant define integer codes that represent the various
** text encodings supported by SQLite.
*/
#define SQLITE_UTF8           1
#define SQLITE_UTF16LE        2
#define SQLITE_UTF16BE        3
................................................................................
** the use of these functions.  To help encourage people to avoid
** using these functions, we are not going to tell you want they do.
*/
int sqlite3_aggregate_count(sqlite3_context*);
int sqlite3_expired(sqlite3_stmt*);
int sqlite3_transfer_bindings(sqlite3_stmt*, sqlite3_stmt*);
int sqlite3_global_recover(void);




/*
** CAPI3REF: Obtaining SQL Function Parameter Values
**
** The C-language implementation of SQL functions and aggregates uses
** this set of interface routines to access the parameter values on
** the function or aggregate.
**
** The xFunc (for scalar functions) or xStep (for aggregates) parameters
** to [sqlite3_create_function()] and [sqlite3_create_function16()]
................................................................................
** in the native byte-order of the host machine.  The
** sqlite3_value_text16be() and sqlite3_value_text16le() interfaces
** extract UTF16 strings as big-endian and little-endian respectively.
**
** The sqlite3_value_numeric_type() interface attempts to apply
** numeric affinity to the value.  This means that an attempt is
** made to convert the value to an integer or floating point.  If
** such a conversion is possible without loss of information (in order
** words if the value is original a string that looks like a number)
** then it is done.  Otherwise no conversion occurs.  The 
** [SQLITE_INTEGER | datatype] after conversion is returned.
**
** Please pay particular attention to the fact that the pointer that
** is returned from [sqlite3_value_blob()], [sqlite3_value_text()], or
** [sqlite3_value_text16()] can be invalidated by a subsequent call to
** [sqlite3_value_bytes()], [sqlite3_value_bytes16()], [sqlite_value_text()],
** or [sqlite3_value_text16()].  







*/
const void *sqlite3_value_blob(sqlite3_value*);
int sqlite3_value_bytes(sqlite3_value*);
int sqlite3_value_bytes16(sqlite3_value*);
double sqlite3_value_double(sqlite3_value*);
int sqlite3_value_int(sqlite3_value*);
sqlite_int64 sqlite3_value_int64(sqlite3_value*);
const unsigned char *sqlite3_value_text(sqlite3_value*);
const void *sqlite3_value_text16(sqlite3_value*);
const void *sqlite3_value_text16le(sqlite3_value*);
const void *sqlite3_value_text16be(sqlite3_value*);
int sqlite3_value_type(sqlite3_value*);
int sqlite3_value_numeric_type(sqlite3_value*);

/*
** CAPI3REF: Obtain Aggregate Function Context
**
** The implementation of aggregate SQL functions use this routine to allocate
** a structure for storing their state.  The first time this routine

** is called for a particular aggregate, a new structure of size nBytes
** is allocated, zeroed, and returned.  On subsequent calls (for the



** same aggregate instance) the same buffer is returned.  The implementation
** of the aggregate can use the returned buffer to accumulate data.
**
** The buffer allocated is freed automatically by SQLite whan the aggregate

** query concludes.
**
** The first parameter should be a copy of the 
** [sqlite3_context | SQL function context] that is the first
** parameter to the callback routine that implements the aggregate
** function.



*/
void *sqlite3_aggregate_context(sqlite3_context*, int nBytes);

/*
** CAPI3REF: User Data For Functions
**


** The pUserData parameter to the [sqlite3_create_function()]
** and [sqlite3_create_function16()] routines
** used to register user functions is available to
** the implementation of the function using this call.




*/
void *sqlite3_user_data(sqlite3_context*);

/*
** CAPI3REF: Function Auxiliary Data
**
** The following two functions may be used by scalar SQL functions to
** associate meta-data with argument values. If the same value is passed to
** multiple invocations of the same SQL function during query execution, under
** some circumstances the associated meta-data may be preserved. This may
** be used, for example, to add a regular-expression matching scalar
** function. The compiled version of the regular expression is stored as
** meta-data associated with the SQL value passed as the regular expression
** pattern.  The compiled regular expression can be reused on multiple
** invocations of the same function so that the original pattern string
** does not need to be recompiled on each invocation.
**
** The sqlite3_get_auxdata() interface returns a pointer to the meta-data
** associated with the Nth argument value to the current SQL function
** call, where N is the second parameter. If no meta-data has been set for
** that value, then a NULL pointer is returned.
**
** The sqlite3_set_auxdata() is used to associate meta-data with an SQL
** function argument. The third parameter is a pointer to the meta-data
** to be associated with the Nth user function argument value. The fourth
** parameter specifies a destructor that will be called on the meta-
** data pointer to release it when it is no longer required. If the 
** destructor is NULL, it is not invoked.







**
** In practice, meta-data is preserved between function calls for
** expressions that are constant at compile time. This includes literal
** values and SQL variables.



*/
void *sqlite3_get_auxdata(sqlite3_context*, int);
void sqlite3_set_auxdata(sqlite3_context*, int, void*, void (*)(void*));


/*
** CAPI3REF: Constants Defining Special Destructor Behavior
**
** These are special value for the destructor that is passed in as the
** final argument to routines like [sqlite3_result_blob()].  If the destructor
** argument is SQLITE_STATIC, it means that the content pointer is constant
** and will never change.  It does not need to be destroyed.  The 
** SQLITE_TRANSIENT value means that the content will likely change in
** the near future and that SQLite should make its own private copy of
................................................................................
** C++ compilers.  See ticket #2191.
*/
typedef void (*sqlite3_destructor_type)(void*);
#define SQLITE_STATIC      ((sqlite3_destructor_type)0)
#define SQLITE_TRANSIENT   ((sqlite3_destructor_type)-1)

/*
** CAPI3REF: Setting The Result Of An SQL Function
**
** These routines are used by the xFunc or xFinal callbacks that
** implement SQL functions and aggregates.  See
** [sqlite3_create_function()] and [sqlite3_create_function16()]
** for additional information.
**
** These functions work very much like the 
** [sqlite3_bind_blob | sqlite3_bind_*] family of functions used
** to bind values to host parameters in prepared statements.
** Refer to the
** [sqlite3_bind_blob | sqlite3_bind_* documentation] for
** additional information.
**












** The sqlite3_result_error() and sqlite3_result_error16() functions
** cause the implemented SQL function to throw an exception.  The

** parameter to sqlite3_result_error() or sqlite3_result_error16()
** is the text of an error message.












**
** The sqlite3_result_toobig() cause the function implementation
** to throw and error indicating that a string or BLOB is to long
** to represent.



















































*/
void sqlite3_result_blob(sqlite3_context*, const void*, int, void(*)(void*));
void sqlite3_result_double(sqlite3_context*, double);
void sqlite3_result_error(sqlite3_context*, const char*, int);
void sqlite3_result_error16(sqlite3_context*, const void*, int);
void sqlite3_result_error_toobig(sqlite3_context*);

void sqlite3_result_int(sqlite3_context*, int);
void sqlite3_result_int64(sqlite3_context*, sqlite_int64);
void sqlite3_result_null(sqlite3_context*);
void sqlite3_result_text(sqlite3_context*, const char*, int, void(*)(void*));
void sqlite3_result_text16(sqlite3_context*, const void*, int, void(*)(void*));
void sqlite3_result_text16le(sqlite3_context*, const void*, int,void(*)(void*));
void sqlite3_result_text16be(sqlite3_context*, const void*, int,void(*)(void*));
void sqlite3_result_value(sqlite3_context*, sqlite3_value*);
void sqlite3_result_zeroblob(sqlite3_context*, int n);

/*
** CAPI3REF: Define New Collating Sequences
**

** These functions are used to add new collation sequences to the
** [sqlite3*] handle specified as the first argument. 
**

** The name of the new collation sequence is specified as a UTF-8 string
** for sqlite3_create_collation() and sqlite3_create_collation_v2()
** and a UTF-16 string for sqlite3_create_collation16().  In all cases
** the name is passed as the second function argument.
**

** The third argument must be one of the constants [SQLITE_UTF8],
** [SQLITE_UTF16LE] or [SQLITE_UTF16BE], indicating that the user-supplied
** routine expects to be passed pointers to strings encoded using UTF-8,
** UTF-16 little-endian or UTF-16 big-endian respectively.



**

** A pointer to the user supplied routine must be passed as the fifth
** argument. If it is NULL, this is the same as deleting the collation
** sequence (so that SQLite cannot call it anymore). Each time the user

** supplied function is invoked, it is passed a copy of the void* passed as
** the fourth argument to sqlite3_create_collation() or
** sqlite3_create_collation16() as its first parameter.
**

** The remaining arguments to the user-supplied routine are two strings,
** each represented by a [length, data] pair and encoded in the encoding
** that was passed as the third argument when the collation sequence was

** registered. The user routine should return negative, zero or positive if
** the first string is less than, equal to, or greater than the second
** string. i.e. (STRING1 - STRING2).
**

** The sqlite3_create_collation_v2() works like sqlite3_create_collation()
** excapt that it takes an extra argument which is a destructor for
** the collation.  The destructor is called when the collation is
** destroyed and is passed a copy of the fourth parameter void* pointer
** of the sqlite3_create_collation_v2().  Collations are destroyed when

** they are overridden by later calls to the collation creation functions
** or when the [sqlite3*] database handle is closed using [sqlite3_close()].
**
** The sqlite3_create_collation_v2() interface is experimental and
** subject to change in future releases.  The other collation creation
** functions are stable.
*/
int sqlite3_create_collation(
  sqlite3*, 
  const char *zName, 
  int eTextRep, 
  void*,
  int(*xCompare)(void*,int,const void*,int,const void*)
................................................................................
  const char *zName, 
  int eTextRep, 
  void*,
  int(*xCompare)(void*,int,const void*,int,const void*)
);

/*
** CAPI3REF: Collation Needed Callbacks
**

** To avoid having to register all collation sequences before a database
** can be used, a single callback function may be registered with the
** database handle to be called whenever an undefined collation sequence is
** required.
**

** If the function is registered using the sqlite3_collation_needed() API,
** then it is passed the names of undefined collation sequences as strings
** encoded in UTF-8. If sqlite3_collation_needed16() is used, the names
** are passed as UTF-16 in machine native byte order. A call to either
** function replaces any existing callback.
**
** When the callback is invoked, the first argument passed is a copy
** of the second argument to sqlite3_collation_needed() or
** sqlite3_collation_needed16(). The second argument is the database
** handle. The third argument is one of [SQLITE_UTF8], [SQLITE_UTF16BE], or

** [SQLITE_UTF16LE], indicating the most desirable form of the collation
** sequence function required. The fourth parameter is the name of the
** required collation sequence.
**
** The callback function should register the desired collation using
** [sqlite3_create_collation()], [sqlite3_create_collation16()], or
** [sqlite3_create_collation_v2()].
*/
int sqlite3_collation_needed(
  sqlite3*, 
................................................................................
*/
int sqlite3_rekey(
  sqlite3 *db,                   /* Database to be rekeyed */
  const void *pKey, int nKey     /* The new key */
);

/*
** CAPI3REF:  Suspend Execution For A Short Time
**

** This function causes the current thread to suspend execution
** a number of milliseconds specified in its parameter.
**
** If the operating system does not support sleep requests with 
** millisecond time resolution, then the time will be rounded up to 
** the nearest second. The number of milliseconds of sleep actually 
** requested from the operating system is returned.



*/
int sqlite3_sleep(int);

/*
** CAPI3REF:  Name Of The Folder Holding Temporary Files
**
** If this global variable is made to point to a string which is
** the name of a folder (a.ka. directory), then all temporary files
** created by SQLite will be placed in that directory.  If this variable
** is NULL pointer, then SQLite does a search for an appropriate temporary
** file directory.
**
** Once [sqlite3_open()] has been called, changing this variable will
** invalidate the current temporary database, if any.  Generally speaking,
** it is not safe to invoke this routine after [sqlite3_open()] has
** been called.
*/
extern char *sqlite3_temp_directory;

/*
** CAPI3REF:  Test To See If The Databse Is In Auto-Commit Mode
**
** Test to see whether or not the database connection is in autocommit

** mode.  Return TRUE if it is and FALSE if not.  Autocommit mode is on
** by default.  Autocommit is disabled by a BEGIN statement and reenabled
** by the next COMMIT or ROLLBACK.




























*/
int sqlite3_get_autocommit(sqlite3*);

/*
** CAPI3REF:  Find The Database Handle Associated With A Prepared Statement
**

** Return the [sqlite3*] database handle to which a
** [sqlite3_stmt | prepared statement] belongs.

** This is the same database handle that was
** the first argument to the [sqlite3_prepare_v2()] or its variants
** that was used to create the statement in the first place.
*/
sqlite3 *sqlite3_db_handle(sqlite3_stmt*);


/*
** CAPI3REF: Commit And Rollback Notification Callbacks
**
** These routines
** register callback functions to be invoked whenever a transaction






** is committed or rolled back.  The pArg argument is passed through
** to the callback.  If the callback on a commit hook function 
** returns non-zero, then the commit is converted into a rollback.
**
** If another function was previously registered, its pArg value is returned.
** Otherwise NULL is returned.
**
** Registering a NULL function disables the callback.
**
** For the purposes of this API, a transaction is said to have been 
** rolled back if an explicit "ROLLBACK" statement is executed, or
** an error or constraint causes an implicit rollback to occur. The 
** callback is not invoked if a transaction is automatically rolled
** back because the database connection is closed.



**
** These are experimental interfaces and are subject to change.
*/
void *sqlite3_commit_hook(sqlite3*, int(*)(void*), void*);
void *sqlite3_rollback_hook(sqlite3*, void(*)(void *), void*);

/*
** CAPI3REF: Data Change Notification Callbacks
**

** Register a callback function with the database connection identified by the 
** first argument to be invoked whenever a row is updated, inserted or deleted.
** Any callback set by a previous call to this function for the same 
** database connection is overridden.
**
** The second argument is a pointer to the function to invoke when a 
** row is updated, inserted or deleted. The first argument to the callback is

** a copy of the third argument to sqlite3_update_hook(). The second callback 
** argument is one of SQLITE_INSERT, SQLITE_DELETE or SQLITE_UPDATE, depending


** on the operation that caused the callback to be invoked. The third and 

** fourth arguments to the callback contain pointers to the database and 
** table name containing the affected row. The final callback parameter is 


** the rowid of the row. In the case of an update, this is the rowid after 
** the update takes place.
**
** The update hook is not invoked when internal system tables are
** modified (i.e. sqlite_master and sqlite_sequence).
**
** If another function was previously registered, its pArg value is returned.
** Otherwise NULL is returned.
*/
void *sqlite3_update_hook(
  sqlite3*, 
  void(*)(void *,int ,char const *,char const *,sqlite_int64),
  void*
);

/*
** CAPI3REF:  Enable Or Disable Shared Pager Cache
**

** This routine enables or disables the sharing of the database cache
** and schema data structures between connections to the same database.

** Sharing is enabled if the argument is true and disabled if the argument
** is false.
**
** Cache sharing is enabled and disabled on a thread-by-thread basis.
** Each call to this routine enables or disables cache sharing only for
** connections created in the same thread in which this routine is called.
** There is no mechanism for sharing cache between database connections
** running in different threads.

**
** Sharing must be disabled prior to shutting down a thread or else
** the thread will leak memory.  Call this routine with an argument of
** 0 to turn off sharing.  Or use the sqlite3_thread_cleanup() API.
**
** This routine must not be called when any database connections
** are active in the current thread.  Enabling or disabling shared
** cache while there are active database connections will result
** in memory corruption.
**
** When the shared cache is enabled, the
** following routines must always be called from the same thread:
** [sqlite3_open()], [sqlite3_prepare_v2()], [sqlite3_step()],
** [sqlite3_reset()], [sqlite3_finalize()], and [sqlite3_close()].
** This is due to the fact that the shared cache makes use of
** thread-specific storage so that it will be available for sharing
** with other connections.
**
** Virtual tables cannot be used with a shared cache.  When shared
** cache is enabled, the sqlite3_create_module() API used to register

** virtual tables will always return an error.
**
** This routine returns [SQLITE_OK] if shared cache was
** enabled or disabled successfully.  An [SQLITE_ERROR | error code]
** is returned otherwise.
**
** Shared cache is disabled by default for backward compatibility.


*/
int sqlite3_enable_shared_cache(int);

/*
** CAPI3REF:  Attempt To Free Heap Memory
**

** Attempt to free N bytes of heap memory by deallocating non-essential
** memory allocations held by the database library (example: memory 
** used to cache database pages to improve performance).
**
** This function is not a part of standard builds.  It is only created
** if SQLite is compiled with the SQLITE_ENABLE_MEMORY_MANAGEMENT macro.



*/
int sqlite3_release_memory(int);

/*
** CAPI3REF:  Impose A Limit On Heap Size
**

** Place a "soft" limit on the amount of heap memory that may be allocated by
** SQLite within the current thread. If an internal allocation is requested 
** that would exceed the specified limit, [sqlite3_release_memory()] is invoked
** one or more times to free up some space before the allocation is made.

**
** The limit is called "soft", because if [sqlite3_release_memory()] cannot free

** sufficient memory to prevent the limit from being exceeded, the memory is
** allocated anyway and the current operation proceeds.
**
** Prior to shutting down a thread sqlite3_soft_heap_limit() must be set to 
** zero (the default) or else the thread will leak memory. Alternatively, use
** the [sqlite3_thread_cleanup()] API.
**
** A negative or zero value for N means that there is no soft heap limit and
** [sqlite3_release_memory()] will only be called when memory is exhaused.
** The default value for the soft heap limit is zero.
**
** SQLite makes a best effort to honor the soft heap limit.  But if it
** is unable to reduce memory usage below the soft limit, execution will
** continue without error or notification.  This is why the limit is 
** called a "soft" limit.  It is advisory only.
**
** This function is only available if the library was compiled with the 
** SQLITE_ENABLE_MEMORY_MANAGEMENT option set.
** memory-management has been enabled.




*/
void sqlite3_soft_heap_limit(int);

/*
** CAPI3REF:  Clean Up Thread Local Storage
**
** This routine makes sure that all thread-local storage has been
** deallocated for the current thread.
**
** This routine is not technically necessary.  All thread-local storage
** will be automatically deallocated once memory-management and
** shared-cache are disabled and the soft heap limit has been set
** to zero.  This routine is provided as a convenience for users who
** want to make absolutely sure they have not forgotten something
** prior to killing off a thread.
*/
void sqlite3_thread_cleanup(void);

/*
** CAPI3REF:  Extract Metadata About A Column Of A Table
**
** This routine
** returns meta-data about a specific column of a specific database
** table accessible using the connection handle passed as the first function 
** argument.
**
** The column is identified by the second, third and fourth parameters to 
................................................................................
  const char *zDbName,        /* Database name or NULL */
  const char *zTableName,     /* Table name */
  const char *zColumnName,    /* Column name */
  char const **pzDataType,    /* OUTPUT: Declared data type */
  char const **pzCollSeq,     /* OUTPUT: Collation sequence name */
  int *pNotNull,              /* OUTPUT: True if NOT NULL constraint exists */
  int *pPrimaryKey,           /* OUTPUT: True if column part of PK */
  int *pAutoinc               /* OUTPUT: True if colums is auto-increment */
);

/*
** CAPI3REF: Load An Extension
**

** Attempt to load an SQLite extension library contained in the file
** zFile.  The entry point is zProc.  zProc may be 0 in which case the

** name of the entry point defaults to "sqlite3_extension_init".
**

** Return [SQLITE_OK] on success and [SQLITE_ERROR] if something goes wrong.
**

** If an error occurs and pzErrMsg is not 0, then fill *pzErrMsg with 


** error message text.  The calling function should free this memory
** by calling [sqlite3_free()].
**

** Extension loading must be enabled using [sqlite3_enable_load_extension()]
** prior to calling this API or an error will be returned.
*/
int sqlite3_load_extension(
  sqlite3 *db,          /* Load the extension into this database connection */
  const char *zFile,    /* Name of the shared library containing extension */
  const char *zProc,    /* Entry point.  Derived from zFile if 0 */
  char **pzErrMsg       /* Put error message here if not 0 */
);

/*
** CAPI3REF:  Enable Or Disable Extension Loading
**
** So as not to open security holes in older applications that are
** unprepared to deal with extension loading, and as a means of disabling
** extension loading while evaluating user-entered SQL, the following
** API is provided to turn the [sqlite3_load_extension()] mechanism on and
** off.  It is off by default.  See ticket #1863.
**

** Call this routine with onoff==1 to turn extension loading on
** and call it with onoff==0 to turn it back off again.
*/
int sqlite3_enable_load_extension(sqlite3 *db, int onoff);

/*
** CAPI3REF: Make Arrangements To Automatically Load An Extension
**

** Register an extension entry point that is automatically invoked
** whenever a new database connection is opened using
** [sqlite3_open()] or [sqlite3_open16()].

**
** This API can be invoked at program startup in order to register
** one or more statically linked extensions that will be available
** to all new database connections.
**
** Duplicate extensions are detected so calling this routine multiple
** times with the same extension is harmless.
**
** This routine stores a pointer to the extension in an array
** that is obtained from malloc().  If you run a memory leak
** checker on your program and it reports a leak because of this
** array, then invoke [sqlite3_automatic_extension_reset()] prior
** to shutdown to free the memory.
**
** Automatic extensions apply across all threads.
**
** This interface is experimental and is subject to change or
** removal in future releases of SQLite.
*/
int sqlite3_auto_extension(void *xEntryPoint);


/*
** CAPI3REF: Reset Automatic Extension Loading
**

** Disable all previously registered automatic extensions.  This
** routine undoes the effect of all prior [sqlite3_automatic_extension()]
** calls.
**
** This call disabled automatic extensions in all threads.
**
** This interface is experimental and is subject to change or
** removal in future releases of SQLite.
*/
void sqlite3_reset_auto_extension(void);


................................................................................
  int (*xOpen)(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor);
  int (*xClose)(sqlite3_vtab_cursor*);
  int (*xFilter)(sqlite3_vtab_cursor*, int idxNum, const char *idxStr,
                int argc, sqlite3_value **argv);
  int (*xNext)(sqlite3_vtab_cursor*);
  int (*xEof)(sqlite3_vtab_cursor*);
  int (*xColumn)(sqlite3_vtab_cursor*, sqlite3_context*, int);
  int (*xRowid)(sqlite3_vtab_cursor*, sqlite_int64 *pRowid);
  int (*xUpdate)(sqlite3_vtab *, int, sqlite3_value **, sqlite_int64 *);
  int (*xBegin)(sqlite3_vtab *pVTab);
  int (*xSync)(sqlite3_vtab *pVTab);
  int (*xCommit)(sqlite3_vtab *pVTab);
  int (*xRollback)(sqlite3_vtab *pVTab);
  int (*xFindFunction)(sqlite3_vtab *pVtab, int nArg, const char *zName,
                       void (**pxFunc)(sqlite3_context*,int,sqlite3_value**),
                       void **ppArg);
................................................................................
** results into the **Outputs** fields.
**
** The aConstraint[] array records WHERE clause constraints of the
** form:
**
**         column OP expr
**

** Where OP is =, <, <=, >, or >=.  The particular operator is stored
** in aConstraint[].op.  The index of the column is stored in 
** aConstraint[].iColumn.  aConstraint[].usable is TRUE if the
** expr on the right-hand side can be evaluated (and thus the constraint
** is usable) and false if it cannot.
**
** The optimizer automatically inverts terms of the form "expr OP column"
** and makes other simplificatinos to the WHERE clause in an attempt to
** get as many WHERE clause terms into the form shown above as possible.
** The aConstraint[] array only reports WHERE clause terms in the correct
** form that refer to the particular virtual table being queried.
**
** Information about the ORDER BY clause is stored in aOrderBy[].
** Each term of aOrderBy records a column of the ORDER BY clause.
**
................................................................................
** The estimatedCost value is an estimate of the cost of doing the
** particular lookup.  A full scan of a table with N entries should have
** a cost of N.  A binary search of a table of N entries should have a
** cost of approximately log(N).
*/
struct sqlite3_index_info {
  /* Inputs */
  const int nConstraint;     /* Number of entries in aConstraint */
  const struct sqlite3_index_constraint {
     int iColumn;              /* Column on left-hand side of constraint */
     unsigned char op;         /* Constraint operator */
     unsigned char usable;     /* True if this constraint is usable */
     int iTermOffset;          /* Used internally - xBestIndex should ignore */
  } *const aConstraint;      /* Table of WHERE clause constraints */
  const int nOrderBy;        /* Number of terms in the ORDER BY clause */
  const struct sqlite3_index_orderby {
     int iColumn;              /* Column number */
     unsigned char desc;       /* True for DESC.  False for ASC. */
  } *const aOrderBy;         /* The ORDER BY clause */

  /* Outputs */
  struct sqlite3_index_constraint_usage {
    int argvIndex;           /* if >0, constraint is part of argv to xFilter */
    unsigned char omit;      /* Do not code a test for this constraint */
  } *const aConstraintUsage;
  int idxNum;                /* Number used to identify the index */
  char *idxStr;              /* String, possibly obtained from sqlite3_malloc */
  int needToFreeIdxStr;      /* Free idxStr using sqlite3_free() if true */
  int orderByConsumed;       /* True if output is already ordered */
  double estimatedCost;      /* Estimated cost of using this index */
};
#define SQLITE_INDEX_CONSTRAINT_EQ    2
................................................................................
  void *,                    /* Client data for xCreate/xConnect */
  void(*xDestroy)(void*)     /* Module destructor function */
);

/*
** Every module implementation uses a subclass of the following structure
** to describe a particular instance of the module.  Each subclass will
** be taylored to the specific needs of the module implementation.   The
** purpose of this superclass is to define certain fields that are common
** to all module implementations.
**
** Virtual tables methods can set an error message by assigning a
** string obtained from sqlite3_mprintf() to zErrMsg.  The method should
** take care that any prior string is freed by a call to sqlite3_free()
** prior to assigning a new string to zErrMsg.  After the error message
................................................................................

/*
** The interface to the virtual-table mechanism defined above (back up
** to a comment remarkably similar to this one) is currently considered
** to be experimental.  The interface might change in incompatible ways.
** If this is a problem for you, do not use the interface at this time.
**
** When the virtual-table mechanism stablizes, we will declare the
** interface fixed, support it indefinitely, and remove this comment.
**
****** EXPERIMENTAL - subject to change without notice **************
*/

/*
** CAPI3REF: A Handle To An Open BLOB
**
** An instance of the following opaque structure is used to 
** represent an blob-handle.  A blob-handle is created by
** [sqlite3_blob_open()] and destroyed by [sqlite3_blob_close()].
** The [sqlite3_blob_read()] and [sqlite3_blob_write()] interfaces
** can be used to read or write small subsections of the blob.
** The [sqltie3_blob_size()] interface returns the size of the
** blob in bytes.
*/
typedef struct sqlite3_blob sqlite3_blob;

/*
** CAPI3REF: Open A BLOB For Incremental I/O
**
** Open a handle to the blob located in row iRow,, column zColumn, 
** table zTable in database zDb. i.e. the same blob that would
** be selected by:
**
** <pre>
**     SELECT zColumn FROM zDb.zTable WHERE rowid = iRow;
** </pre>
**
** If the flags parameter is non-zero, the blob is opened for 
** read and write access. If it is zero, the blob is opened for read 
** access.
**
** On success, [SQLITE_OK] is returned and the new 
** [sqlite3_blob | blob handle] is written to *ppBlob.
** Otherwise an error code is returned and 
** any value written to *ppBlob should not be used by the caller.
** This function sets the database-handle error code and message
** accessible via [sqlite3_errcode()] and [sqlite3_errmsg()].


*/
int sqlite3_blob_open(
  sqlite3*,
  const char *zDb,
  const char *zTable,
  const char *zColumn,
  sqlite_int64 iRow,
  int flags,
  sqlite3_blob **ppBlob
);

/*
** CAPI3REF:  Close A BLOB Handle
**
** Close an open [sqlite3_blob | blob handle].













*/
int sqlite3_blob_close(sqlite3_blob *);

/*
** CAPI3REF:  Return The Size Of An Open BLOB
**
** Return the size in bytes of the blob accessible via the open 
** [sqlite3_blob | blob-handle] passed as an argument.
*/
int sqlite3_blob_bytes(sqlite3_blob *);

/*
** CAPI3REF:  Read Data From A BLOB Incrementally
**
** This function is used to read data from an open 
** [sqlite3_blob | blob-handle] into a caller supplied buffer.
** n bytes of data are copied into buffer
** z from the open blob, starting at offset iOffset.
**




** On success, SQLITE_OK is returned. Otherwise, an 
** [SQLITE_ERROR | SQLite error code] or an
** [SQLITE_IOERR_READ | extended error code] is returned.
*/
int sqlite3_blob_read(sqlite3_blob *, void *z, int n, int iOffset);

/*
** CAPI3REF:  Write Data Into A BLOB Incrementally
**
** This function is used to write data into an open 
** [sqlite3_blob | blob-handle] from a user supplied buffer.
** n bytes of data are copied from the buffer
** pointed to by z into the open blob, starting at offset iOffset.
**
** If the [sqlite3_blob | blob-handle] passed as the first argument
** was not opened for writing (the flags parameter to [sqlite3_blob_open()]
*** was zero), this function returns [SQLITE_READONLY].
**
** This function may only modify the contents of the blob, it is
** not possible to increase the size of a blob using this API. If
** offset iOffset is less than n bytes from the end of the blob, 
** [SQLITE_ERROR] is returned and no data is written.

**
** On success, SQLITE_OK is returned. Otherwise, an 
** [SQLITE_ERROR | SQLite error code] or an
** [SQLITE_IOERR_READ | extended error code] is returned.
*/
int sqlite3_blob_write(sqlite3_blob *, const void *z, int n, int iOffset);

/*





































































































































































































































































** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double
#endif

#ifdef __cplusplus
}  /* End of the 'extern "C"' block */
#endif
#endif







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1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891

1892
1893
1894
1895

1896



1897
1898
1899
1900
1901
1902





1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924

1925

1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074

2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103



2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
....
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166

2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201

2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
....
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305


2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334

2335
2336
2337
2338
2339
2340
2341
2342
2343
2344

2345
2346
2347
2348
2349
2350

2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508

2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672

2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
....
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
....
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924

2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
....
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
....
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033

3034
3035
3036
3037
3038
3039
3040
....
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
....
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
....
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
....
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357

3358
3359
3360
3361
3362
3363
3364
3365
3366
....
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423

3424
3425
3426
3427
3428
3429

3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449


3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
....
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683




3684
3685
3686
3687
3688
3689
3690
....
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
....
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812

3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904

3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938


3939
3940
3941
3942

3943
3944
3945
3946
3947


3948








3949

3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969



3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990



3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011















4012
4013
4014
4015
4016
4017
4018
4019
....
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137

4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
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** on how SQLite interfaces are suppose to operate.
**
** The name of this file under configuration management is "sqlite.h.in".
** The makefile makes some minor changes to this file (such as inserting
** the version number) and changes its name to "sqlite3.h" as
** part of the build process.
**
** @(#) $Id: sqlite.h.in,v 1.283 2008/01/31 17:21:22 drh Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.
*/
#ifdef __cplusplus
extern "C" {
#endif


/*
** Add the ability to override 'extern'
*/
#ifndef SQLITE_EXTERN
# define SQLITE_EXTERN extern
#endif

/*
** Make sure these symbols where not defined by some previous header
** file.
*/
#ifdef SQLITE_VERSION
# undef SQLITE_VERSION
#endif
#ifdef SQLITE_VERSION_NUMBER
# undef SQLITE_VERSION_NUMBER
#endif

/*
** CAPI3REF: Compile-Time Library Version Numbers {F10010}
**
** The SQLITE_VERSION and SQLITE_VERSION_NUMBER #defines in
** the sqlite3.h file specify the version of SQLite with which
** that header file is associated.
**
** The "version" of SQLite is a strong of the form "X.Y.Z".
** The phrase "alpha" or "beta" might be appended after the Z.
** The X value is major version number always 3 in SQLite3.


** The X value only changes when  backwards compatibility is
** broken and we intend to never break
** backwards compatibility.  The Y value is the minor version
** number and only changes when
** there are major feature enhancements that are forwards compatible
** but not backwards compatible.  The Z value is release number
** and is incremented with
** each release but resets back to 0 when Y is incremented.
**
** See also: [sqlite3_libversion()] and [sqlite3_libversion_number()].
**
** INVARIANTS:
**
** {F10011} The SQLITE_VERSION #define in the sqlite3.h header file
**          evaluates to a string literal that is the SQLite version
**          with which the header file is associated.
**

** {F10014} The SQLITE_VERSION_NUMBER #define resolves to an integer
**          with the value  (X*1000000 + Y*1000 + Z) where X, Y, and
**          Z are the major version, minor version, and release number.
*/
#define SQLITE_VERSION         "3.5.5"
#define SQLITE_VERSION_NUMBER 3005005

/*
** CAPI3REF: Run-Time Library Version Numbers {F10020}
** KEYWORDS: sqlite3_version
**

** These features provide the same information as the [SQLITE_VERSION]
** and [SQLITE_VERSION_NUMBER] #defines in the header, but are associated
** with the library instead of the header file.  Cautious programmers might
** include a check in their application to verify that 
** sqlite3_libversion_number() always returns the value 
** [SQLITE_VERSION_NUMBER].




**

** The sqlite3_libversion() function returns the same information as is
** in the sqlite3_version[] string constant.  The function is provided

** for use in DLLs since DLL users usually do not have direct access to string
** constants within the DLL.
**
** INVARIANTS:
**
** {F10021} The [sqlite3_libversion_number()] interface returns an integer
**          equal to [SQLITE_VERSION_NUMBER]. 
**
** {F10022} The [sqlite3_version] string constant contains the text of the
**          [SQLITE_VERSION] string. 
**
** {F10023} The [sqlite3_libversion()] function returns
**          a pointer to the [sqlite3_version] string constant.
*/
SQLITE_EXTERN const char sqlite3_version[];
const char *sqlite3_libversion(void);
int sqlite3_libversion_number(void);

/*
** CAPI3REF: Test To See If The Library Is Threadsafe {F10100}
**
** SQLite can be compiled with or without mutexes.  When
** the SQLITE_THREADSAFE C preprocessor macro is true, mutexes
** are enabled and SQLite is threadsafe.  When that macro os false,
** the mutexes are omitted.  Without the mutexes, it is not safe
** to use SQLite from more than one thread.
**
** There is a measurable performance penalty for enabling mutexes.
** So if speed is of utmost importance, it makes sense to disable
** the mutexes.  But for maximum safety, mutexes should be enabled.
** The default behavior is for mutexes to be enabled.
**
** This interface can be used by a program to make sure that the
** version of SQLite that it is linking against was compiled with
** the desired setting of the SQLITE_THREADSAFE macro.
**
** INVARIANTS:
**
** {F10101} The [sqlite3_threadsafe()] function returns nonzero if
**          SQLite was compiled with its mutexes enabled or zero
**          if SQLite was compiled with mutexes disabled.
*/
int sqlite3_threadsafe(void);

/*
** CAPI3REF: Database Connection Handle {F12000}
** KEYWORDS: {database connection}
**
** Each open SQLite database is represented by pointer to an instance of the
** opaque structure named "sqlite3".  It is useful to think of an sqlite3
** pointer as an object.  The [sqlite3_open()], [sqlite3_open16()], and
** [sqlite3_open_v2()] interfaces are its constructors
** and [sqlite3_close()] is its destructor.  There are many other interfaces
** (such as [sqlite3_prepare_v2()], [sqlite3_create_function()], and
** [sqlite3_busy_timeout()] to name but three) that are methods on this
** object.
*/
typedef struct sqlite3 sqlite3;


/*
** CAPI3REF: 64-Bit Integer Types {F10200}
** KEYWORDS: sqlite_int64 sqlite_uint64
**

** Because there is no cross-platform way to specify 64-bit integer types
** SQLite includes typedefs for 64-bit signed and unsigned integers.
**

** The sqlite3_int64 and sqlite3_uint64 are the preferred type
** definitions.  The sqlite_int64 and sqlite_uint64 types are
** supported for backwards compatibility only.
**
** INVARIANTS:
**
** {F10201} The [sqlite_int64] and [sqlite3_int64] types specify a
**          64-bit signed integer.
**
** {F10202} The [sqlite_uint64] and [sqlite3_uint64] types specify
**          a 64-bit unsigned integer.
*/
#ifdef SQLITE_INT64_TYPE
  typedef SQLITE_INT64_TYPE sqlite_int64;
  typedef unsigned SQLITE_INT64_TYPE sqlite_uint64;
#elif defined(_MSC_VER) || defined(__BORLANDC__)
  typedef __int64 sqlite_int64;
  typedef unsigned __int64 sqlite_uint64;
#else
  typedef long long int sqlite_int64;
  typedef unsigned long long int sqlite_uint64;
#endif
typedef sqlite_int64 sqlite3_int64;
typedef sqlite_uint64 sqlite3_uint64;

/*
** If compiling for a processor that lacks floating point support,
** substitute integer for floating-point
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# define double sqlite3_int64
#endif

/*
** CAPI3REF: Closing A Database Connection {F12010}
**
** This routine is the destructor for the [sqlite3] object.  


**
** Applications should [sqlite3_finalize | finalize] all
** [prepared statements] and
** [sqlite3_blob_close | close] all [sqlite3_blob | BLOBs] 
** associated with the [sqlite3] object prior
** to attempting to close the [sqlite3] object.
**
** <todo>What happens to pending transactions?  Are they
** rolled back, or abandoned?</todo>
**
** INVARIANTS:
**
** {F12011} The [sqlite3_close()] interface destroys an [sqlite3] object
**          allocated by a prior call to [sqlite3_open()],
**          [sqlite3_open16()], or [sqlite3_open_v2()].
**
** {F12012} The [sqlite3_close()] function releases all memory used by the
**          connection and closes all open files.
**
** {F12013} If the database connection contains
**          [prepared statements] that have not been
**          finalized by [sqlite3_finalize()], then [sqlite3_close()]
**          returns [SQLITE_BUSY] and leaves the connection open.
**
** {F12014} Giving sqlite3_close() a NULL pointer is a harmless no-op.
**
** LIMITATIONS:
**
** {U12015} The parameter to [sqlite3_close()] must be an [sqlite3] object
**          pointer previously obtained from [sqlite3_open()] or the 
**          equivalent, or NULL.
**
** {U12016} The parameter to [sqlite3_close()] must not have been previously
**          closed.
*/
int sqlite3_close(sqlite3 *);

/*
** The type for a callback function.
** This is legacy and deprecated.  It is included for historical
** compatibility and is not documented.
*/
typedef int (*sqlite3_callback)(void*,int,char**, char**);

/*
** CAPI3REF: One-Step Query Execution Interface {F12100}
**


** The sqlite3_exec() interface is a convenient way of running
** one or more SQL statements without a lot of C code.  The
** SQL statements are passed in as the second parameter to


** sqlite3_exec().  The statements are evaluated one by one
** until either an error or an interrupt is encountered or
** until they are all done.  The 3rd parameter is an optional
** callback that is invoked once for each row of any query results
** produced by the SQL statements.  The 5th parameter tells where
** to write any error messages.
**
** The sqlite3_exec() interface is implemented in terms of
** [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()].
** The sqlite3_exec() routine does nothing that cannot be done
** by [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()].
** The sqlite3_exec() is just a convenient wrapper.
**
** INVARIANTS:
** 
** {F12101} The [sqlite3_exec()] interface evaluates zero or more UTF-8
**          encoded, semicolon-separated, SQL statements in the
**          zero-terminated string of its 2nd parameter within the
**          context of the [sqlite3] object given in the 1st parameter.
**
** {F12104} The return value of [sqlite3_exec()] is SQLITE_OK if all
**          SQL statements run successfully.
**
** {F12105} The return value of [sqlite3_exec()] is an appropriate 
**          non-zero error code if any SQL statement fails.
**
** {F12107} If one or more of the SQL statements handed to [sqlite3_exec()]
**          return results and the 3rd parameter is not NULL, then
**          the callback function specified by the 3rd parameter is
**          invoked once for each row of result.
**
** {F12110} If the callback returns a non-zero value then [sqlite3_exec()]
**          will aborted the SQL statement it is currently evaluating,
**          skip all subsequent SQL statements, and return [SQLITE_ABORT].

**          <todo>What happens to *errmsg here?  Does the result code for
**          sqlite3_errcode() get set?</todo>
**


** {F12113} The [sqlite3_exec()] routine will pass its 4th parameter through
**          as the 1st parameter of the callback.
**



** {F12116} The [sqlite3_exec()] routine sets the 2nd parameter of its
**          callback to be the number of columns in the current row of
**          result.
**
** {F12119} The [sqlite3_exec()] routine sets the 3rd parameter of its 
**          callback to be an array of pointers to strings holding the
**          values for each column in the current result set row as
**          obtained from [sqlite3_column_text()].



**



** {F12122} The [sqlite3_exec()] routine sets the 4th parameter of its
**          callback to be an array of pointers to strings holding the
**          names of result columns as obtained from [sqlite3_column_name()].
**
** {F12125} If the 3rd parameter to [sqlite3_exec()] is NULL then
**          [sqlite3_exec()] never invokes a callback.  All query
**          results are silently discarded.
**
** {F12128} If an error occurs while parsing or evaluating any of the SQL


**          statements handed to [sqlite3_exec()] then [sqlite3_exec()] will
**          return an [error code] other than [SQLITE_OK].
**
** {F12131} If an error occurs while parsing or evaluating any of the SQL
**          handed to [sqlite3_exec()] and if the 5th parameter (errmsg)
**          to [sqlite3_exec()] is not NULL, then an error message is
**          allocated using the equivalent of [sqlite3_mprintf()] and
**          *errmsg is made to point to that message.



**



** {F12134} The [sqlite3_exec()] routine does not change the value of
**          *errmsg if errmsg is NULL or if there are no errors.
**
** {F12137} The [sqlite3_exec()] function sets the error code and message
**          accessible via [sqlite3_errcode()] and [sqlite3_errmsg()].
**
** LIMITATIONS:
**
** {U12141} The first parameter to [sqlite3_exec()] must be an valid and open
**          [database connection].
**
** {U12142} The database connection must not be closed while
**          [sqlite3_exec()] is running.
** 
** {U12143} The calling function is should use [sqlite3_free()] to free
**          the memory that *errmsg is left pointing at once the error
**          message is no longer needed.
**
** {U12145} The SQL statement text in the 2nd parameter to [sqlite3_exec()]
**          must remain unchanged while [sqlite3_exec()] is running.
*/
int sqlite3_exec(
  sqlite3*,                                  /* An open database */
  const char *sql,                           /* SQL to be evaluted */
  int (*callback)(void*,int,char**,char**),  /* Callback function */
  void *,                                    /* 1st argument to callback */
  char **errmsg                              /* Error msg written here */
);

/*
** CAPI3REF: Result Codes {F10210}
** KEYWORDS: SQLITE_OK {error code} {error codes}
**
** Many SQLite functions return an integer result code from the set shown
** here in order to indicates success or failure.
**





** See also: [SQLITE_IOERR_READ | extended result codes]

*/
#define SQLITE_OK           0   /* Successful result */
/* beginning-of-error-codes */
#define SQLITE_ERROR        1   /* SQL error or missing database */
#define SQLITE_INTERNAL     2   /* Internal logic error in SQLite */
#define SQLITE_PERM         3   /* Access permission denied */
#define SQLITE_ABORT        4   /* Callback routine requested an abort */
#define SQLITE_BUSY         5   /* The database file is locked */
#define SQLITE_LOCKED       6   /* A table in the database is locked */
#define SQLITE_NOMEM        7   /* A malloc() failed */
#define SQLITE_READONLY     8   /* Attempt to write a readonly database */
#define SQLITE_INTERRUPT    9   /* Operation terminated by sqlite3_interrupt()*/
................................................................................
#define SQLITE_NOTFOUND    12   /* NOT USED. Table or record not found */
#define SQLITE_FULL        13   /* Insertion failed because database is full */
#define SQLITE_CANTOPEN    14   /* Unable to open the database file */
#define SQLITE_PROTOCOL    15   /* NOT USED. Database lock protocol error */
#define SQLITE_EMPTY       16   /* Database is empty */
#define SQLITE_SCHEMA      17   /* The database schema changed */
#define SQLITE_TOOBIG      18   /* String or BLOB exceeds size limit */
#define SQLITE_CONSTRAINT  19   /* Abort due to constraint violation */
#define SQLITE_MISMATCH    20   /* Data type mismatch */
#define SQLITE_MISUSE      21   /* Library used incorrectly */
#define SQLITE_NOLFS       22   /* Uses OS features not supported on host */
#define SQLITE_AUTH        23   /* Authorization denied */
#define SQLITE_FORMAT      24   /* Auxiliary database format error */
#define SQLITE_RANGE       25   /* 2nd parameter to sqlite3_bind out of range */
#define SQLITE_NOTADB      26   /* File opened that is not a database file */
#define SQLITE_ROW         100  /* sqlite3_step() has another row ready */
#define SQLITE_DONE        101  /* sqlite3_step() has finished executing */
/* end-of-error-codes */

/*
** CAPI3REF: Extended Result Codes {F10220}
** KEYWORDS: {extended error code} {extended error codes}
** KEYWORDS: {extended result codes}
**
** In its default configuration, SQLite API routines return one of 26 integer
** [SQLITE_OK | result codes].  However, experience has shown that
** many of these result codes are too course-grained.  They do not provide as
** much information about problems as programmers might like.  In an effort to
** address this, newer versions of SQLite (version 3.3.8 and later) include
** support for additional result codes that provide more detailed information
** about errors. The extended result codes are enabled or disabled

** for each database connection using the [sqlite3_extended_result_codes()]
** API.
** 
** Some of the available extended result codes are listed here.
** One may expect the number of extended result codes will be expand
** over time.  Software that uses extended result codes should expect
** to see new result codes in future releases of SQLite.






**
** The SQLITE_OK result code will never be extended.  It will always
** be exactly zero.
** 
** INVARIANTS:
**
** {F10223} The symbolic name for an extended result code always contains
**          a related primary result code as a prefix.
**
** {F10224} Primary result code names contain a single "_" character.
**
** {F10225} Extended result code names contain two or more "_" characters.
**
** {F10226} The numeric value of an extended result code contains the
**          numeric value of its corresponding primary result code it
**          its least significant 8 bits.
*/
#define SQLITE_IOERR_READ          (SQLITE_IOERR | (1<<8))
#define SQLITE_IOERR_SHORT_READ    (SQLITE_IOERR | (2<<8))
#define SQLITE_IOERR_WRITE         (SQLITE_IOERR | (3<<8))
#define SQLITE_IOERR_FSYNC         (SQLITE_IOERR | (4<<8))
#define SQLITE_IOERR_DIR_FSYNC     (SQLITE_IOERR | (5<<8))
#define SQLITE_IOERR_TRUNCATE      (SQLITE_IOERR | (6<<8))
#define SQLITE_IOERR_FSTAT         (SQLITE_IOERR | (7<<8))
#define SQLITE_IOERR_UNLOCK        (SQLITE_IOERR | (8<<8))
#define SQLITE_IOERR_RDLOCK        (SQLITE_IOERR | (9<<8))
#define SQLITE_IOERR_DELETE        (SQLITE_IOERR | (10<<8))
#define SQLITE_IOERR_BLOCKED       (SQLITE_IOERR | (11<<8))
#define SQLITE_IOERR_NOMEM         (SQLITE_IOERR | (12<<8))

/*
** CAPI3REF: Flags For File Open Operations {F10230}
**
** These bit values are intended for use in then
** 3rd parameter to the [sqlite3_open_v2()] interface and
** in the 4th parameter to the xOpen method of the
** [sqlite3_vfs] object.
*/
#define SQLITE_OPEN_READONLY         0x00000001
#define SQLITE_OPEN_READWRITE        0x00000002
#define SQLITE_OPEN_CREATE           0x00000004
#define SQLITE_OPEN_DELETEONCLOSE    0x00000008
#define SQLITE_OPEN_EXCLUSIVE        0x00000010
#define SQLITE_OPEN_MAIN_DB          0x00000100
#define SQLITE_OPEN_TEMP_DB          0x00000200
#define SQLITE_OPEN_TRANSIENT_DB     0x00000400
#define SQLITE_OPEN_MAIN_JOURNAL     0x00000800
#define SQLITE_OPEN_TEMP_JOURNAL     0x00001000
#define SQLITE_OPEN_SUBJOURNAL       0x00002000
#define SQLITE_OPEN_MASTER_JOURNAL   0x00004000

/*
** CAPI3REF: Device Characteristics {F10240}
**
** The xDeviceCapabilities method of the [sqlite3_io_methods]
** object returns an integer which is a vector of the these
** bit values expressing I/O characteristics of the mass storage
** device that holds the file that the [sqlite3_io_methods]
** refers to.
**
** The SQLITE_IOCAP_ATOMIC property means that all writes of
** any size are atomic.  The SQLITE_IOCAP_ATOMICnnn values
** mean that writes of blocks that are nnn bytes in size and
** are aligned to an address which is an integer multiple of
** nnn are atomic.  The SQLITE_IOCAP_SAFE_APPEND value means
** that when data is appended to a file, the data is appended
** first then the size of the file is extended, never the other
** way around.  The SQLITE_IOCAP_SEQUENTIAL property means that
** information is written to disk in the same order as calls
** to xWrite().
*/
#define SQLITE_IOCAP_ATOMIC          0x00000001
#define SQLITE_IOCAP_ATOMIC512       0x00000002
#define SQLITE_IOCAP_ATOMIC1K        0x00000004
#define SQLITE_IOCAP_ATOMIC2K        0x00000008
#define SQLITE_IOCAP_ATOMIC4K        0x00000010
#define SQLITE_IOCAP_ATOMIC8K        0x00000020
#define SQLITE_IOCAP_ATOMIC16K       0x00000040
#define SQLITE_IOCAP_ATOMIC32K       0x00000080
#define SQLITE_IOCAP_ATOMIC64K       0x00000100
#define SQLITE_IOCAP_SAFE_APPEND     0x00000200
#define SQLITE_IOCAP_SEQUENTIAL      0x00000400

/*
** CAPI3REF: File Locking Levels {F10250}
**
** SQLite uses one of these integer values as the second
** argument to calls it makes to the xLock() and xUnlock() methods
** of an [sqlite3_io_methods] object.
*/
#define SQLITE_LOCK_NONE          0
#define SQLITE_LOCK_SHARED        1
#define SQLITE_LOCK_RESERVED      2
#define SQLITE_LOCK_PENDING       3
#define SQLITE_LOCK_EXCLUSIVE     4

/*
** CAPI3REF: Synchronization Type Flags {F10260}
**
** When SQLite invokes the xSync() method of an
** [sqlite3_io_methods] object it uses a combination of the
** these integer values as the second argument.
**
** When the SQLITE_SYNC_DATAONLY flag is used, it means that the
** sync operation only needs to flush data to mass storage.  Inode
** information need not be flushed. The SQLITE_SYNC_NORMAL means 
** to use normal fsync() semantics. The SQLITE_SYNC_FULL flag means 
** to use Mac OS-X style fullsync instead of fsync().
*/
#define SQLITE_SYNC_NORMAL        0x00002
#define SQLITE_SYNC_FULL          0x00003
#define SQLITE_SYNC_DATAONLY      0x00010


/*
** CAPI3REF: OS Interface Open File Handle {F11110}
**
** An [sqlite3_file] object represents an open file in the OS
** interface layer.  Individual OS interface implementations will
** want to subclass this object by appending additional fields
** for their own use.  The pMethods entry is a pointer to an
** [sqlite3_io_methods] object that defines methods for performing
** I/O operations on the open file.
*/
typedef struct sqlite3_file sqlite3_file;
struct sqlite3_file {
  const struct sqlite3_io_methods *pMethods;  /* Methods for an open file */
};

/*
** CAPI3REF: OS Interface File Virtual Methods Object {F11120}
**
** Every file opened by the [sqlite3_vfs] xOpen method contains a pointer to
** an instance of the this object.  This object defines the
** methods used to perform various operations against the open file.
**
** The flags argument to xSync may be one of [SQLITE_SYNC_NORMAL] or
** [SQLITE_SYNC_FULL].  The first choice is the normal fsync().
*  The second choice is an
** OS-X style fullsync.  The SQLITE_SYNC_DATA flag may be ORed in to
** indicate that only the data of the file and not its inode needs to be
** synced.
** 
** The integer values to xLock() and xUnlock() are one of
** <ul>
** <li> [SQLITE_LOCK_NONE],
** <li> [SQLITE_LOCK_SHARED],
** <li> [SQLITE_LOCK_RESERVED],
** <li> [SQLITE_LOCK_PENDING], or
** <li> [SQLITE_LOCK_EXCLUSIVE].
** </ul>
** xLock() increases the lock. xUnlock() decreases the lock.  
** The xCheckReservedLock() method looks
** to see if any database connection, either in this
** process or in some other process, is holding an RESERVED,
** PENDING, or EXCLUSIVE lock on the file.  It returns true
** if such a lock exists and false if not.
** 
** The xFileControl() method is a generic interface that allows custom
** VFS implementations to directly control an open file using the
** [sqlite3_file_control()] interface.  The second "op" argument
** is an integer opcode.   The third
** argument is a generic pointer which is intended to be a pointer
** to a structure that may contain arguments or space in which to
** write return values.  Potential uses for xFileControl() might be
** functions to enable blocking locks with timeouts, to change the
** locking strategy (for example to use dot-file locks), to inquire
** about the status of a lock, or to break stale locks.  The SQLite
** core reserves opcodes less than 100 for its own use. 
** A [SQLITE_FCNTL_LOCKSTATE | list of opcodes] less than 100 is available.
** Applications that define a custom xFileControl method should use opcodes 
** greater than 100 to avoid conflicts.
**
** The xSectorSize() method returns the sector size of the
** device that underlies the file.  The sector size is the
** minimum write that can be performed without disturbing
** other bytes in the file.  The xDeviceCharacteristics()
** method returns a bit vector describing behaviors of the
** underlying device:
**
** <ul>
** <li> [SQLITE_IOCAP_ATOMIC]
** <li> [SQLITE_IOCAP_ATOMIC512]
** <li> [SQLITE_IOCAP_ATOMIC1K]
** <li> [SQLITE_IOCAP_ATOMIC2K]
** <li> [SQLITE_IOCAP_ATOMIC4K]
** <li> [SQLITE_IOCAP_ATOMIC8K]
** <li> [SQLITE_IOCAP_ATOMIC16K]
** <li> [SQLITE_IOCAP_ATOMIC32K]
** <li> [SQLITE_IOCAP_ATOMIC64K]
** <li> [SQLITE_IOCAP_SAFE_APPEND]
** <li> [SQLITE_IOCAP_SEQUENTIAL]
** </ul>
**
** The SQLITE_IOCAP_ATOMIC property means that all writes of
** any size are atomic.  The SQLITE_IOCAP_ATOMICnnn values
** mean that writes of blocks that are nnn bytes in size and
** are aligned to an address which is an integer multiple of
** nnn are atomic.  The SQLITE_IOCAP_SAFE_APPEND value means
** that when data is appended to a file, the data is appended
** first then the size of the file is extended, never the other
** way around.  The SQLITE_IOCAP_SEQUENTIAL property means that
** information is written to disk in the same order as calls
** to xWrite().
*/
typedef struct sqlite3_io_methods sqlite3_io_methods;
struct sqlite3_io_methods {
  int iVersion;
  int (*xClose)(sqlite3_file*);
  int (*xRead)(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
  int (*xWrite)(sqlite3_file*, const void*, int iAmt, sqlite3_int64 iOfst);
  int (*xTruncate)(sqlite3_file*, sqlite3_int64 size);
  int (*xSync)(sqlite3_file*, int flags);
  int (*xFileSize)(sqlite3_file*, sqlite3_int64 *pSize);
  int (*xLock)(sqlite3_file*, int);
  int (*xUnlock)(sqlite3_file*, int);
  int (*xCheckReservedLock)(sqlite3_file*);
  int (*xFileControl)(sqlite3_file*, int op, void *pArg);
  int (*xSectorSize)(sqlite3_file*);
  int (*xDeviceCharacteristics)(sqlite3_file*);
  /* Additional methods may be added in future releases */
};

/*
** CAPI3REF: Standard File Control Opcodes {F11310}
**
** These integer constants are opcodes for the xFileControl method
** of the [sqlite3_io_methods] object and to the [sqlite3_file_control()]
** interface.
**
** The [SQLITE_FCNTL_LOCKSTATE] opcode is used for debugging.  This
** opcode cases the xFileControl method to write the current state of
** the lock (one of [SQLITE_LOCK_NONE], [SQLITE_LOCK_SHARED],
** [SQLITE_LOCK_RESERVED], [SQLITE_LOCK_PENDING], or [SQLITE_LOCK_EXCLUSIVE])
** into an integer that the pArg argument points to. This capability
** is used during testing and only needs to be supported when SQLITE_TEST
** is defined.
*/
#define SQLITE_FCNTL_LOCKSTATE        1

/*
** CAPI3REF: Mutex Handle {F17110}
**
** The mutex module within SQLite defines [sqlite3_mutex] to be an
** abstract type for a mutex object.  The SQLite core never looks
** at the internal representation of an [sqlite3_mutex].  It only
** deals with pointers to the [sqlite3_mutex] object.
**
** Mutexes are created using [sqlite3_mutex_alloc()].
*/
typedef struct sqlite3_mutex sqlite3_mutex;

/*
** CAPI3REF: OS Interface Object {F11140}
**
** An instance of this object defines the interface between the
** SQLite core and the underlying operating system.  The "vfs"
** in the name of the object stands for "virtual file system".
**
** The iVersion field is initially 1 but may be larger for future
** versions of SQLite.  Additional fields may be appended to this
** object when the iVersion value is increased.
**
** The szOsFile field is the size of the subclassed [sqlite3_file]
** structure used by this VFS.  mxPathname is the maximum length of
** a pathname in this VFS.
**
** Registered vfs modules are kept on a linked list formed by
** the pNext pointer.  The [sqlite3_vfs_register()]
** and [sqlite3_vfs_unregister()] interfaces manage this list
** in a thread-safe way.  The [sqlite3_vfs_find()] interface
** searches the list.
**
** The pNext field is the only fields in the sqlite3_vfs 
** structure that SQLite will ever modify.  SQLite will only access
** or modify this field while holding a particular static mutex.
** The application should never modify anything within the sqlite3_vfs
** object once the object has been registered.
**
** The zName field holds the name of the VFS module.  The name must
** be unique across all VFS modules.
**
** {F11141} SQLite will guarantee that the zFilename string passed to
** xOpen() is a full pathname as generated by xFullPathname() and
** that the string will be valid and unchanged until xClose() is
** called.  {END} So the [sqlite3_file] can store a pointer to the
** filename if it needs to remember the filename for some reason.
**
** {F11142} The flags argument to xOpen() includes all bits set in
** the flags argument to [sqlite3_open_v2()].  Or if [sqlite3_open()]
** or [sqlite3_open16()] is used, then flags includes at least
** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]. {END}
** If xOpen() opens a file read-only then it sets *pOutFlags to
** include [SQLITE_OPEN_READONLY].  Other bits in *pOutFlags may be
** set.
** 
** {F11143} SQLite will also add one of the following flags to the xOpen()
** call, depending on the object being opened:
** 
** <ul>
** <li>  [SQLITE_OPEN_MAIN_DB]
** <li>  [SQLITE_OPEN_MAIN_JOURNAL]
** <li>  [SQLITE_OPEN_TEMP_DB]
** <li>  [SQLITE_OPEN_TEMP_JOURNAL]
** <li>  [SQLITE_OPEN_TRANSIENT_DB]
** <li>  [SQLITE_OPEN_SUBJOURNAL]
** <li>  [SQLITE_OPEN_MASTER_JOURNAL]
** </ul> {END}
**
** The file I/O implementation can use the object type flags to
** changes the way it deals with files.  For example, an application
** that does not care about crash recovery or rollback, might make
** the open of a journal file a no-op.  Writes to this journal are
** also a no-op.  Any attempt to read the journal return SQLITE_IOERR.
** Or the implementation might recognize the a database file will
** be doing page-aligned sector reads and writes in a random order
** and set up its I/O subsystem accordingly.
** 
** SQLite might also add one of the following flags to the xOpen
** method:
** 
** <ul>
** <li> [SQLITE_OPEN_DELETEONCLOSE]
** <li> [SQLITE_OPEN_EXCLUSIVE]
** </ul>
** 
** {F11145} The [SQLITE_OPEN_DELETEONCLOSE] flag means the file should be
** deleted when it is closed.  {F11146} The [SQLITE_OPEN_DELETEONCLOSE]
** will be set for TEMP  databases, journals and for subjournals. 
** {F11147} The [SQLITE_OPEN_EXCLUSIVE] flag means the file should be opened
** for exclusive access.  This flag is set for all files except
** for the main database file. {END}
** 
** {F11148} At least szOsFile bytes of memory is allocated by SQLite 
** to hold the  [sqlite3_file] structure passed as the third 
** argument to xOpen.  {END}  The xOpen method does not have to
** allocate the structure; it should just fill it in.
** 
** {F11149} The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS] 
** to test for the existance of a file,
** or [SQLITE_ACCESS_READWRITE] to test to see
** if a file is readable and writable, or [SQLITE_ACCESS_READ]
** to test to see if a file is at least readable.  {END} The file can be a 
** directory.
** 
** {F11150} SQLite will always allocate at least mxPathname+1 byte for
** the output buffers for xGetTempname and xFullPathname. {F11151} The exact
** size of the output buffer is also passed as a parameter to both 
** methods. {END} If the output buffer is not large enough, SQLITE_CANTOPEN
** should be returned. As this is handled as a fatal error by SQLite,
** vfs implementations should endeavor to prevent this by setting 
** mxPathname to a sufficiently large value.
** 
** The xRandomness(), xSleep(), and xCurrentTime() interfaces
** are not strictly a part of the filesystem, but they are
** included in the VFS structure for completeness.
** The xRandomness() function attempts to return nBytes bytes
** of good-quality randomness into zOut.  The return value is
** the actual number of bytes of randomness obtained.  The
** xSleep() method cause the calling thread to sleep for at
** least the number of microseconds given.  The xCurrentTime()
** method returns a Julian Day Number for the current date and
** time.
*/
typedef struct sqlite3_vfs sqlite3_vfs;
struct sqlite3_vfs {
  int iVersion;            /* Structure version number */
  int szOsFile;            /* Size of subclassed sqlite3_file */
  int mxPathname;          /* Maximum file pathname length */
  sqlite3_vfs *pNext;      /* Next registered VFS */
  const char *zName;       /* Name of this virtual file system */
  void *pAppData;          /* Pointer to application-specific data */
  int (*xOpen)(sqlite3_vfs*, const char *zName, sqlite3_file*,
               int flags, int *pOutFlags);
  int (*xDelete)(sqlite3_vfs*, const char *zName, int syncDir);
  int (*xAccess)(sqlite3_vfs*, const char *zName, int flags);
  int (*xGetTempname)(sqlite3_vfs*, int nOut, char *zOut);
  int (*xFullPathname)(sqlite3_vfs*, const char *zName, int nOut, char *zOut);
  void *(*xDlOpen)(sqlite3_vfs*, const char *zFilename);
  void (*xDlError)(sqlite3_vfs*, int nByte, char *zErrMsg);
  void *(*xDlSym)(sqlite3_vfs*,void*, const char *zSymbol);
  void (*xDlClose)(sqlite3_vfs*, void*);
  int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut);
  int (*xSleep)(sqlite3_vfs*, int microseconds);
  int (*xCurrentTime)(sqlite3_vfs*, double*);
  /* New fields may be appended in figure versions.  The iVersion
  ** value will increment whenever this happens. */
};

/*
** CAPI3REF: Flags for the xAccess VFS method {F11190}
**
** {F11191} These integer constants can be used as the third parameter to
** the xAccess method of an [sqlite3_vfs] object. {END}  They determine
** the kind of what kind of permissions the xAccess method is
** looking for.  {F11192} With SQLITE_ACCESS_EXISTS, the xAccess method
** simply checks to see if the file exists. {F11193} With
** SQLITE_ACCESS_READWRITE, the xAccess method checks to see
** if the file is both readable and writable.  {F11194} With
** SQLITE_ACCESS_READ the xAccess method
** checks to see if the file is readable.
*/
#define SQLITE_ACCESS_EXISTS    0
#define SQLITE_ACCESS_READWRITE 1
#define SQLITE_ACCESS_READ      2

/*
** CAPI3REF: Enable Or Disable Extended Result Codes {F12200}
**
** The sqlite3_extended_result_codes() routine enables or disables the
** [SQLITE_IOERR_READ | extended result codes] feature of SQLite.

** The extended result codes are disabled by default for historical
** compatibility.
**
** INVARIANTS:
**
** {F12201} Each new [database connection] has the 
**          [extended result codes] feature



**          disabled by default.
**

** {F12202} The [sqlite3_extended_result_codes(D,F)] interface will enable
**          [extended result codes] for the 

**          [database connection] D if the F parameter
**          is true, or disable them if F is false.
*/
int sqlite3_extended_result_codes(sqlite3*, int onoff);

/*
** CAPI3REF: Last Insert Rowid {F12220}
**
** Each entry in an SQLite table has a unique 64-bit signed
** integer key called the "rowid". The rowid is always available
** as an undeclared column named ROWID, OID, or _ROWID_ as long as those
** names are not also used by explicitly declared columns. If
** the table has a column of type INTEGER PRIMARY KEY then that column

** is another an alias for the rowid.
**
** This routine returns the rowid of the most recent
** successful INSERT into the database from the database connection
** shown in the first argument.  If no successful inserts
** have ever occurred on this database connection, zero is returned.

**
** If an INSERT occurs within a trigger, then the rowid of the
** inserted row is returned by this routine as long as the trigger
** is running.  But once the trigger terminates, the value returned
** by this routine reverts to the last value inserted before the
** trigger fired.
**
** An INSERT that fails due to a constraint violation is not a
** successful insert and does not change the value returned by this
** routine.  Thus INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK,
** and INSERT OR ABORT make no changes to the return value of this
** routine when their insertion fails.  When INSERT OR REPLACE 
** encounters a constraint violation, it does not fail.  The
** INSERT continues to completion after deleting rows that caused
** the constraint problem so INSERT OR REPLACE will always change
** the return value of this interface. 
**
** For the purposes of this routine, an insert is considered to
** be successful even if it is subsequently rolled back.
**
** INVARIANTS:
**
** {F12221} The [sqlite3_last_insert_rowid()] function returns the
**          rowid of the most recent successful insert done
**          on the same database connection and within the same
**          trigger context, or zero if there have
**          been no qualifying inserts on that connection.
**
** {F12223} The [sqlite3_last_insert_rowid()] function returns
**          same value when called from the same trigger context
**          immediately before and after a ROLLBACK.
**
** LIMITATIONS:
**
** {U12232} If separate thread does a new insert on the same
**          database connection while the [sqlite3_last_insert_rowid()]
**          function is running and thus changes the last insert rowid,
**          then the value returned by [sqlite3_last_insert_rowid()] is
**          unpredictable and might not equal either the old or the new
**          last insert rowid.
*/
sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*);

/*
** CAPI3REF: Count The Number Of Rows Modified {F12240}
**
** This function returns the number of database rows that were changed

** or inserted or deleted by the most recently completed SQL statement
** on the connection specified by the first parameter.  Only
** changes that are directly specified by the INSERT, UPDATE, or
** DELETE statement are counted.  Auxiliary changes caused by
** triggers are not counted. Use the [sqlite3_total_changes()] function
** to find the total number of changes including changes caused by triggers.
**
** A "row changes" is a change to a single row of a single table
** caused by an INSERT, DELETE, or UPDATE statement.  Rows that
** are changed as side effects of REPLACE constraint resolution,
** rollback, ABORT processing, DROP TABLE, or by any other
** mechanisms do not count as direct row changes.
**
** A "trigger context" is a scope of execution that begins and
** ends with the script of a trigger.  Most SQL statements are
** evaluated outside of any trigger.  This is the "top level"
** trigger context.  If a trigger fires from the top level, a
** new trigger context is entered for the duration of that one
** trigger.  Subtriggers create subcontexts for their duration.
**
** Calling [sqlite3_exec()] or [sqlite3_step()] recursively does
** not create a new trigger context.
**
** This function returns the number of direct row changes in the
** most recent INSERT, UPDATE, or DELETE statement within the same
** trigger context.
**
** So when called from the top level, this function returns the
** number of changes in the most recent INSERT, UPDATE, or DELETE
** that also occurred at the top level.
** Within the body of a trigger, the sqlite3_changes() interface
** can be called to find the number of
** changes in the most recently completed INSERT, UPDATE, or DELETE
** statement within the body of the same trigger.
** However, the number returned does not include in changes
** caused by subtriggers since they have their own context.
**








** SQLite implements the command "DELETE FROM table" without
** a WHERE clause by dropping and recreating the table.  (This is much
** faster than going through and deleting individual elements from the


** table.)  Because of this optimization, the deletions in
** "DELETE FROM table" are not row changes and will not be counted
** by the sqlite3_changes() or [sqlite3_total_changes()] functions.
** To get an accurate count of the number of rows deleted, use
** "DELETE FROM table WHERE 1" instead.
**
** INVARIANTS:
**
** {F12241} The [sqlite3_changes()] function returns the number of
**          row changes caused by the most recent INSERT, UPDATE,
**          or DELETE statement on the same database connection and
**          within the same trigger context, or zero if there have
**          not been any qualifying row changes.
**
** LIMITATIONS:
**
** {U12252} If a separate thread makes changes on the same database connection
**          while [sqlite3_changes()] is running then the value returned
**          is unpredictable and unmeaningful.
*/
int sqlite3_changes(sqlite3*);

/*
** CAPI3REF: Total Number Of Rows Modified {F12260}
***
** This function returns the number of row changes caused
** by INSERT, UPDATE or DELETE statements since the database handle
** was opened.  The count includes all changes from all trigger
** contexts.  But the count does not include changes used to
** implement REPLACE constraints, do rollbacks or ABORT processing,
** or DROP table processing.
** The changes
** are counted as soon as the statement that makes them is completed 
** (when the statement handle is passed to [sqlite3_reset()] or 
** [sqlite3_finalize()]).
**


** SQLite implements the command "DELETE FROM table" without
** a WHERE clause by dropping and recreating the table.  (This is much
** faster than going
** through and deleting individual elements form the table.)  Because of
** this optimization, the change count for "DELETE FROM table" will be
** zero regardless of the number of elements that were originally in the
** table. To get an accurate count of the number of rows deleted, use
** "DELETE FROM table WHERE 1" instead.
**
** See also the [sqlite3_changes()] interface.
**
** INVARIANTS:
** 
** {F12261} The [sqlite3_total_changes()] returns the total number
**          of row changes caused by INSERT, UPDATE, and/or DELETE
**          statements on the same [database connection], in any
**          trigger context, since the database connection was
**          created.
**
** LIMITATIONS:
**
** {U12264} If a separate thread makes changes on the same database connection
**          while [sqlite3_total_changes()] is running then the value 
**          returned is unpredictable and unmeaningful.
*/
int sqlite3_total_changes(sqlite3*);

/*
** CAPI3REF: Interrupt A Long-Running Query {F12270}
**
** This function causes any pending database operation to abort and
** return at its earliest opportunity. This routine is typically
** called in response to a user action such as pressing "Cancel"
** or Ctrl-C where the user wants a long query operation to halt
** immediately.
**
** It is safe to call this routine from a thread different from the
** thread that is currently running the database operation.  But it
** is not safe to call this routine with a database connection that
** is closed or might close before sqlite3_interrupt() returns.
**
** If an SQL is very nearly finished at the time when sqlite3_interrupt()
** is called, then it might not have an opportunity to be interrupted.
** It might continue to completion.
** An SQL operation that is interrupted will return

** [SQLITE_INTERRUPT].  If the interrupted SQL operation is an
** INSERT, UPDATE, or DELETE that is inside an explicit transaction, 
** then the entire transaction will be rolled back automatically.

** A call to sqlite3_interrupt() has no effect on SQL statements
** that are started after sqlite3_interrupt() returns.
**
** INVARIANTS:
**
** {F12271} The [sqlite3_interrupt()] interface will force all running
**          SQL statements associated with the same database connection
**          to halt after processing at most one additional row of
**          data.
**
** {F12272} Any SQL statement that is interrupted by [sqlite3_interrupt()]
**          will return [SQLITE_INTERRUPT].
**
** LIMITATIONS:
**
** {U12279} If the database connection closes while [sqlite3_interrupt()]
**          is running then bad things will likely happen.
*/
void sqlite3_interrupt(sqlite3*);

/*
** CAPI3REF: Determine If An SQL Statement Is Complete {F10510}
**






** These routines are useful for command-line input to determine if the
** currently entered text seems to form complete a SQL statement or
** if additional input is needed before sending the text into
** SQLite for parsing.  These routines return true if the input string




** appears to be a complete SQL statement.  A statement is judged to be
** complete if it ends with a semicolon token and is not a fragment of a
** CREATE TRIGGER statement.  Semicolons that are embedded within
** string literals or quoted identifier names or comments are not
** independent tokens (they are part of the token in which they are
** embedded) and thus do not count as a statement terminator.
**
** These routines do not parse the SQL and
** so will not detect syntactically incorrect SQL.
**
** INVARIANTS:
**
** {F10511} The sqlite3_complete() and sqlite3_complete16() functions
**          return true (non-zero) if and only if the last
**          non-whitespace token in their input is a semicolon that
**          is not in between the BEGIN and END of a CREATE TRIGGER
**          statement.
**
** LIMITATIONS:
**
** {U10512} The input to sqlite3_complete() must be a zero-terminated
**          UTF-8 string.
**
** {U10513} The input to sqlite3_complete16() must be a zero-terminated
**          UTF-16 string in native byte order.
*/
int sqlite3_complete(const char *sql);
int sqlite3_complete16(const void *sql);

/*
** CAPI3REF: Register A Callback To Handle SQLITE_BUSY Errors {F12310}
**
** This routine identifies a callback function that might be
** invoked whenever an attempt is made to open a database table 
** that another thread or process has locked.
** If the busy callback is NULL, then [SQLITE_BUSY]
** or [SQLITE_IOERR_BLOCKED]
** is returned immediately upon encountering the lock.
** If the busy callback is not NULL, then the
** callback will be invoked with two arguments.  The
** first argument to the handler is a copy of the void* pointer which
** is the third argument to this routine.  The second argument to
** the handler is the number of times that the busy handler has
** been invoked for this locking event.   If the
** busy callback returns 0, then no additional attempts are made to
** access the database and [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED] is returned.
** If the callback returns non-zero, then another attempt
** is made to open the database for reading and the cycle repeats.
**
** The presence of a busy handler does not guarantee that
** it will be invoked when there is lock contention.
** If SQLite determines that invoking the busy handler could result in
** a deadlock, it will go ahead and return [SQLITE_BUSY] or
** [SQLITE_IOERR_BLOCKED] instead of invoking the
** busy handler.
** Consider a scenario where one process is holding a read lock that
** it is trying to promote to a reserved lock and
** a second process is holding a reserved lock that it is trying
** to promote to an exclusive lock.  The first process cannot proceed
** because it is blocked by the second and the second process cannot
** proceed because it is blocked by the first.  If both processes
** invoke the busy handlers, neither will make any progress.  Therefore,
** SQLite returns [SQLITE_BUSY] for the first process, hoping that this
** will induce the first process to release its read lock and allow
** the second process to proceed.
**
** The default busy callback is NULL.
**
** The [SQLITE_BUSY] error is converted to [SQLITE_IOERR_BLOCKED]
** when SQLite is in the middle of a large transaction where all the
** changes will not fit into the in-memory cache.  SQLite will
** already hold a RESERVED lock on the database file, but it needs
** to promote this lock to EXCLUSIVE so that it can spill cache
** pages into the database file without harm to concurrent
** readers.  If it is unable to promote the lock, then the in-memory
** cache will be left in an inconsistent state and so the error
** code is promoted from the relatively benign [SQLITE_BUSY] to
** the more severe [SQLITE_IOERR_BLOCKED].  This error code promotion
** forces an automatic rollback of the changes.  See the
** <a href="http://www.sqlite.org/cvstrac/wiki?p=CorruptionFollowingBusyError">
** CorruptionFollowingBusyError</a> wiki page for a discussion of why
** this is important.
**	







** There can only be a single busy handler defined for each database
** connection.  Setting a new busy handler clears any previous one. 
** Note that calling [sqlite3_busy_timeout()] will also set or clear
** the busy handler.
**
** INVARIANTS:
**
** {F12311} The [sqlite3_busy_handler()] function replaces the busy handler
**          callback in the database connection identified by the 1st
**          parameter with a new busy handler identified by the 2nd and 3rd
**          parameters.
**
** {F12312} The default busy handler for new database connections is NULL.
**
** {F12314} When two or more database connection share a common cache,
**          the busy handler for the database connection currently using
**          the cache is invoked when the cache encounters a lock.
**
** {F12316} If a busy handler callback returns zero, then the SQLite
**          interface that provoked the locking event will return
**          [SQLITE_BUSY].
**
** {F12318} SQLite will invokes the busy handler with two argument which
**          are a copy of the pointer supplied by the 3rd parameter to
**          [sqlite3_busy_handler()] and a count of the number of prior
**          invocations of the busy handler for the same locking event.
**
** LIMITATIONS:
**
** {U12319} A busy handler should not call close the database connection
**          or prepared statement that invoked the busy handler.
*/
int sqlite3_busy_handler(sqlite3*, int(*)(void*,int), void*);

/*
** CAPI3REF: Set A Busy Timeout {F12340}
**
** This routine sets a [sqlite3_busy_handler | busy handler]
** that sleeps for a while when a
** table is locked.  The handler will sleep multiple times until 
** at least "ms" milliseconds of sleeping have been done. {F12343} After
** "ms" milliseconds of sleeping, the handler returns 0 which
** causes [sqlite3_step()] to return [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED].
**
** Calling this routine with an argument less than or equal to zero
** turns off all busy handlers.
**
** There can only be a single busy handler for a particular database
** connection.  If another busy handler was defined  
** (using [sqlite3_busy_handler()]) prior to calling
** this routine, that other busy handler is cleared.
**
** INVARIANTS:
**
** {F12341} The [sqlite3_busy_timeout()] function overrides any prior
**          [sqlite3_busy_timeout()] or [sqlite3_busy_handler()] setting
**          on the same database connection.
**
** {F12343} If the 2nd parameter to [sqlite3_busy_timeout()] is less than
**          or equal to zero, then the busy handler is cleared so that
**          all subsequent locking events immediately return [SQLITE_BUSY].
**
** {F12344} If the 2nd parameter to [sqlite3_busy_timeout()] is a positive
**          number N, then a busy handler is set that repeatedly calls
**          the xSleep() method in the VFS interface until either the
**          lock clears or until the cumulative sleep time reported back
**          by xSleep() exceeds N milliseconds.
*/
int sqlite3_busy_timeout(sqlite3*, int ms);

/*
** CAPI3REF: Convenience Routines For Running Queries {F12370}
**
** Definition: A <b>result table</b> is memory data structure created by the
** [sqlite3_get_table()] interface.  A result table records the
** complete query results from one or more queries.
**
** The table conceptually has a number of rows and columns.  But
** these numbers are not part of the result table itself.  These
** numbers are obtained separately.  Let N be the number of rows
** and M be the number of columns.
**

** A result table is an array of pointers to zero-terminated
** UTF-8 strings.  There are (N+1)*M elements in the array.  
** The first M pointers point to zero-terminated strings that 
** contain the names of the columns.
** The remaining entries all point to query results.  NULL
** values are give a NULL pointer.  All other values are in
** their UTF-8 zero-terminated string representation as returned by
** [sqlite3_column_text()].
**
** A result table might consists of one or more memory allocations.
** It is not safe to pass a result table directly to [sqlite3_free()].
** A result table should be deallocated using [sqlite3_free_table()].
**
** As an example of the result table format, suppose a query result
** is as follows:
**
** <blockquote><pre>
**        Name        | Age
**        -----------------------
**        Alice       | 43
**        Bob         | 28
**        Cindy       | 21
** </pre></blockquote>
**


** There are two column (M==2) and three rows (N==3).  Thus the
** result table has 8 entries.  Suppose the result table is stored
** in an array names azResult.  Then azResult holds this content:
**

** <blockquote><pre>
**        azResult&#91;0] = "Name";
**        azResult&#91;1] = "Age";
**        azResult&#91;2] = "Alice";
**        azResult&#91;3] = "43";
**        azResult&#91;4] = "Bob";
**        azResult&#91;5] = "28";
**        azResult&#91;6] = "Cindy";
**        azResult&#91;7] = "21";
** </pre></blockquote>
**




** The sqlite3_get_table() function evaluates one or more
** semicolon-separated SQL statements in the zero-terminated UTF-8
** string of its 2nd parameter.  It returns a result table to the
** pointer given in its 3rd parameter.
**
** After the calling function has finished using the result, it should 
** pass the pointer to the result table to sqlite3_free_table() in order to 
** release the memory that was malloc-ed.  Because of the way the 
** [sqlite3_malloc()] happens within sqlite3_get_table(), the calling
** function must not try to call [sqlite3_free()] directly.  Only 
** [sqlite3_free_table()] is able to release the memory properly and safely.
**

** The sqlite3_get_table() interface is implemented as a wrapper around
** [sqlite3_exec()].  The sqlite3_get_table() routine does not have access
** to any internal data structures of SQLite.  It uses only the public
** interface defined here.  As a consequence, errors that occur in the
** wrapper layer outside of the internal [sqlite3_exec()] call are not
** reflected in subsequent calls to [sqlite3_errcode()] or
** [sqlite3_errmsg()].
**
** INVARIANTS:
**
** {F12371} If a [sqlite3_get_table()] fails a memory allocation, then
**          it frees the result table under construction, aborts the
**          query in process, skips any subsequent queries, sets the
**          *resultp output pointer to NULL and returns [SQLITE_NOMEM].
**
** {F12373} If the ncolumn parameter to [sqlite3_get_table()] is not NULL
**          then [sqlite3_get_table()] write the number of columns in the
**          result set of the query into *ncolumn if the query is
**          successful (if the function returns SQLITE_OK).
**
** {F12374} If the nrow parameter to [sqlite3_get_table()] is not NULL
**          then [sqlite3_get_table()] write the number of rows in the
**          result set of the query into *nrow if the query is
**          successful (if the function returns SQLITE_OK).
**
** {F12376} The [sqlite3_get_table()] function sets its *ncolumn value
**          to the number of columns in the result set of the query in the
**          sql parameter, or to zero if the query in sql has an empty
**          result set.
*/
int sqlite3_get_table(
  sqlite3*,             /* An open database */
  const char *sql,      /* SQL to be evaluated */

  char ***pResult,      /* Results of the query */
  int *nrow,            /* Number of result rows written here */
  int *ncolumn,         /* Number of result columns written here */
  char **errmsg         /* Error msg written here */
);
void sqlite3_free_table(char **result);

/*
** CAPI3REF: Formatted String Printing Functions {F17400}
**
** These routines are workalikes of the "printf()" family of functions
** from the standard C library.
**
** The sqlite3_mprintf() and sqlite3_vmprintf() routines write their
** results into memory obtained from [sqlite3_malloc()].
** The strings returned by these two routines should be
** released by [sqlite3_free()].   Both routines return a
** NULL pointer if [sqlite3_malloc()] is unable to allocate enough
** memory to hold the resulting string.
**
** In sqlite3_snprintf() routine is similar to "snprintf()" from
** the standard C library.  The result is written into the
** buffer supplied as the second parameter whose size is given by
** the first parameter. Note that the order of the
** first two parameters is reversed from snprintf().  This is an
** historical accident that cannot be fixed without breaking
** backwards compatibility.  Note also that sqlite3_snprintf()
** returns a pointer to its buffer instead of the number of
** characters actually written into the buffer.  We admit that
** the number of characters written would be a more useful return
** value but we cannot change the implementation of sqlite3_snprintf()
................................................................................
** parameter "n" is the total size of the buffer, including space for
** the zero terminator.  So the longest string that can be completely
** written will be n-1 characters.
**
** These routines all implement some additional formatting
** options that are useful for constructing SQL statements.
** All of the usual printf formatting options apply.  In addition, there
** is are "%q", "%Q", and "%z" options.
**
** The %q option works like %s in that it substitutes a null-terminated
** string from the argument list.  But %q also doubles every '\'' character.
** %q is designed for use inside a string literal.  By doubling each '\''
** character it escapes that character and allows it to be inserted into
** the string.
**
................................................................................
** This second example is an SQL syntax error.  As a general rule you
** should always use %q instead of %s when inserting text into a string 
** literal.
**
** The %Q option works like %q except it also adds single quotes around
** the outside of the total string.  Or if the parameter in the argument
** list is a NULL pointer, %Q substitutes the text "NULL" (without single
** quotes) in place of the %Q option. {END}  So, for example, one could say:
**
** <blockquote><pre>
**  char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES(%Q)", zText);
**  sqlite3_exec(db, zSQL, 0, 0, 0);
**  sqlite3_free(zSQL);
** </pre></blockquote>
**
** The code above will render a correct SQL statement in the zSQL
** variable even if the zText variable is a NULL pointer.
**
** The "%z" formatting option works exactly like "%s" with the
** addition that after the string has been read and copied into
** the result, [sqlite3_free()] is called on the input string. {END}
**
** INVARIANTS:
**
** {F17403}  The [sqlite3_mprintf()] and [sqlite3_vmprintf()] interfaces
**           return either pointers to zero-terminated UTF-8 strings held in
**           memory obtained from [sqlite3_malloc()] or NULL pointers if
**           a call to [sqlite3_malloc()] fails.
**
** {F17406}  The [sqlite3_snprintf()] interface writes a zero-terminated
**           UTF-8 string into the buffer pointed to by the second parameter
**           provided that the first parameter is greater than zero.
**
** {F17407}  The [sqlite3_snprintf()] interface does not writes slots of
**           its output buffer (the second parameter) outside the range
**           of 0 through N-1 (where N is the first parameter)
**           regardless of the length of the string
**           requested by the format specification.
**   
*/
char *sqlite3_mprintf(const char*,...);
char *sqlite3_vmprintf(const char*, va_list);
char *sqlite3_snprintf(int,char*,const char*, ...);

/*
** CAPI3REF: Memory Allocation Subsystem {F17300}
**





** The SQLite core  uses these three routines for all of its own
** internal memory allocation needs. "Core" in the previous sentence
** does not include operating-system specific VFS implementation.  The
** windows VFS uses native malloc and free for some operations.
**
** The sqlite3_malloc() routine returns a pointer to a block
** of memory at least N bytes in length, where N is the parameter.
** If sqlite3_malloc() is unable to obtain sufficient free
** memory, it returns a NULL pointer.  If the parameter N to
** sqlite3_malloc() is zero or negative then sqlite3_malloc() returns
** a NULL pointer.
**
** Calling sqlite3_free() with a pointer previously returned
** by sqlite3_malloc() or sqlite3_realloc() releases that memory so
** that it might be reused.  The sqlite3_free() routine is
** a no-op if is called with a NULL pointer.  Passing a NULL pointer
** to sqlite3_free() is harmless.  After being freed, memory
** should neither be read nor written.  Even reading previously freed
** memory might result in a segmentation fault or other severe error.
** Memory corruption, a segmentation fault, or other severe error
** might result if sqlite3_free() is called with a non-NULL pointer that
** was not obtained from sqlite3_malloc() or sqlite3_free().
**
** The sqlite3_realloc() interface attempts to resize a
** prior memory allocation to be at least N bytes, where N is the
** second parameter.  The memory allocation to be resized is the first
** parameter.  If the first parameter to sqlite3_realloc()
** is a NULL pointer then its behavior is identical to calling
** sqlite3_malloc(N) where N is the second parameter to sqlite3_realloc().
** If the second parameter to sqlite3_realloc() is zero or
** negative then the behavior is exactly the same as calling
** sqlite3_free(P) where P is the first parameter to sqlite3_realloc().
** Sqlite3_realloc() returns a pointer to a memory allocation
** of at least N bytes in size or NULL if sufficient memory is unavailable.
** If M is the size of the prior allocation, then min(N,M) bytes
** of the prior allocation are copied into the beginning of buffer returned
** by sqlite3_realloc() and the prior allocation is freed.
** If sqlite3_realloc() returns NULL, then the prior allocation
** is not freed.
**
** The memory returned by sqlite3_malloc() and sqlite3_realloc()
** is always aligned to at least an 8 byte boundary. {END}
**
** The default implementation
** of the memory allocation subsystem uses the malloc(), realloc()
** and free() provided by the standard C library. {F17382} However, if 
** SQLite is compiled with the following C preprocessor macro
**
** <blockquote> SQLITE_MEMORY_SIZE=<i>NNN</i> </blockquote>
**
** where <i>NNN</i> is an integer, then SQLite create a static
** array of at least <i>NNN</i> bytes in size and use that array
** for all of its dynamic memory allocation needs. {END}  Additional
** memory allocator options may be added in future releases.
**
** In SQLite version 3.5.0 and 3.5.1, it was possible to define
** the SQLITE_OMIT_MEMORY_ALLOCATION which would cause the built-in
** implementation of these routines to be omitted.  That capability
** is no longer provided.  Only built-in memory allocators can be
** used.
**
** The windows OS interface layer calls
** the system malloc() and free() directly when converting
** filenames between the UTF-8 encoding used by SQLite
** and whatever filename encoding is used by the particular windows
** installation.  Memory allocation errors are detected, but
** they are reported back as [SQLITE_CANTOPEN] or
** [SQLITE_IOERR] rather than [SQLITE_NOMEM].
**
** INVARIANTS:
**
** {F17303}  The [sqlite3_malloc(N)] interface returns either a pointer to 
**           newly checked-out block of at least N bytes of memory
**           that is 8-byte aligned, 
**           or it returns NULL if it is unable to fulfill the request.
**
** {F17304}  The [sqlite3_malloc(N)] interface returns a NULL pointer if
**           N is less than or equal to zero.
**
** {F17305}  The [sqlite3_free(P)] interface releases memory previously
**           returned from [sqlite3_malloc()] or [sqlite3_realloc()],
**           making it available for reuse.
**
** {F17306}  A call to [sqlite3_free(NULL)] is a harmless no-op.
**
** {F17310}  A call to [sqlite3_realloc(0,N)] is equivalent to a call
**           to [sqlite3_malloc(N)].
**
** {F17312}  A call to [sqlite3_realloc(P,0)] is equivalent to a call
**           to [sqlite3_free(P)].
**
** {F17315}  The SQLite core uses [sqlite3_malloc()], [sqlite3_realloc()],
**           and [sqlite3_free()] for all of its memory allocation and
**           deallocation needs.
**
** {F17318}  The [sqlite3_realloc(P,N)] interface returns either a pointer
**           to a block of checked-out memory of at least N bytes in size
**           that is 8-byte aligned, or a NULL pointer.
**
** {F17321}  When [sqlite3_realloc(P,N)] returns a non-NULL pointer, it first
**           copies the first K bytes of content from P into the newly allocated
**           where K is the lessor of N and the size of the buffer P.
**
** {F17322}  When [sqlite3_realloc(P,N)] returns a non-NULL pointer, it first
**           releases the buffer P.
**
** {F17323}  When [sqlite3_realloc(P,N)] returns NULL, the buffer P is
**           not modified or released.
**
** LIMITATIONS:
**
** {U17350}  The pointer arguments to [sqlite3_free()] and [sqlite3_realloc()]
**           must be either NULL or else a pointer obtained from a prior
**           invocation of [sqlite3_malloc()] or [sqlite3_realloc()] that has
**           not been released.
**
** {U17351}  The application must not read or write any part of 
**           a block of memory after it has been released using
**           [sqlite3_free()] or [sqlite3_realloc()].
**
*/
void *sqlite3_malloc(int);
void *sqlite3_realloc(void*, int);
void sqlite3_free(void*);

/*
** CAPI3REF: Memory Allocator Statistics {F17370}
**
** SQLite provides these two interfaces for reporting on the status
** of the [sqlite3_malloc()], [sqlite3_free()], and [sqlite3_realloc()]
** the memory allocation subsystem included within the SQLite.
**
** INVARIANTS:
**
** {F17371} The [sqlite3_memory_used()] routine returns the
**          number of bytes of memory currently outstanding 
**          (malloced but not freed).
**
** {F17373} The [sqlite3_memory_highwater()] routine returns the maximum
**          value of [sqlite3_memory_used()] 
**          since the highwater mark was last reset.
**
** {F17374} The values returned by [sqlite3_memory_used()] and
**          [sqlite3_memory_highwater()] include any overhead
**          added by SQLite in its implementation of [sqlite3_malloc()],
**          but not overhead added by the any underlying system library
**          routines that [sqlite3_malloc()] may call.
** 
** {F17375} The memory highwater mark is reset to the current value of
**          [sqlite3_memory_used()] if and only if the parameter to
**          [sqlite3_memory_highwater()] is true.  The value returned
**          by [sqlite3_memory_highwater(1)] is the highwater mark
**          prior to the reset.
*/
sqlite3_int64 sqlite3_memory_used(void);
sqlite3_int64 sqlite3_memory_highwater(int resetFlag);

/*
** CAPI3REF: Compile-Time Authorization Callbacks {F12500}
**
** This routine registers a authorizer callback with a particular
** database connection, supplied in the first argument.
** The authorizer callback is invoked as SQL statements are being compiled
** by [sqlite3_prepare()] or its variants [sqlite3_prepare_v2()],
** [sqlite3_prepare16()] and [sqlite3_prepare16_v2()].  At various
** points during the compilation process, as logic is being created
** to perform various actions, the authorizer callback is invoked to
** see if those actions are allowed.  The authorizer callback should
** return SQLITE_OK to allow the action, [SQLITE_IGNORE] to disallow the
** specific action but allow the SQL statement to continue to be
** compiled, or [SQLITE_DENY] to cause the entire SQL statement to be
** rejected with an error.   If the authorizer callback returns
** any value other than [SQLITE_IGNORE], [SQLITE_OK], or [SQLITE_DENY]
** then [sqlite3_prepare_v2()] or equivalent call that triggered
** the authorizer will fail with an error message.
**



** When the callback returns [SQLITE_OK], that means the operation
** requested is ok.  When the callback returns [SQLITE_DENY], the
** [sqlite3_prepare_v2()] or equivalent call that triggered the
** authorizer will fail with an error message explaining that
** access is denied.  If the authorizer code is [SQLITE_READ]
** and the callback returns [SQLITE_IGNORE] then the prepared
** statement is constructed to insert a NULL value in place of
** the table column that would have
** been read if [SQLITE_OK] had been returned.  The [SQLITE_IGNORE]
** return can be used to deny an untrusted user access to individual
** columns of a table.
**
** The first parameter to the authorizer callback is a copy of
** the third parameter to the sqlite3_set_authorizer() interface.
** The second parameter to the callback is an integer 
** [SQLITE_COPY | action code] that specifies the particular action
** to be authorized. The third through sixth

** parameters to the callback are zero-terminated strings that contain 
** additional details about the action to be authorized.
**
** An authorizer is used when preparing SQL statements from an untrusted
** source, to ensure that the SQL statements do not try to access data
** that they are not allowed to see, or that they do not try to
** execute malicious statements that damage the database.  For
** example, an application may allow a user to enter arbitrary
** SQL queries for evaluation by a database.  But the application does
................................................................................
** not want the user to be able to make arbitrary changes to the
** database.  An authorizer could then be put in place while the
** user-entered SQL is being prepared that disallows everything
** except SELECT statements.  
**
** Only a single authorizer can be in place on a database connection
** at a time.  Each call to sqlite3_set_authorizer overrides the
** previous call.  Disable the authorizer by installing a NULL callback.
** The authorizer is disabled by default.
**
** Note that the authorizer callback is invoked only during 
** [sqlite3_prepare()] or its variants.  Authorization is not
** performed during statement evaluation in [sqlite3_step()].
**
** INVARIANTS:
**
** {F12501} The [sqlite3_set_authorizer(D,...)] interface registers a
**          authorizer callback with database connection D.
**
** {F12502} The authorizer callback is invoked as SQL statements are
**          being compiled
**
** {F12503} If the authorizer callback returns any value other than
**          [SQLITE_IGNORE], [SQLITE_OK], or [SQLITE_DENY] then
**          the [sqlite3_prepare_v2()] or equivalent call that caused
**          the authorizer callback to run shall fail with an
**          [SQLITE_ERROR] error code and an appropriate error message.
**
** {F12504} When the authorizer callback returns [SQLITE_OK], the operation
**          described is coded normally.
**
** {F12505} When the authorizer callback returns [SQLITE_DENY], the
**          [sqlite3_prepare_v2()] or equivalent call that caused the
**          authorizer callback to run shall fail
**          with an [SQLITE_ERROR] error code and an error message
**          explaining that access is denied.
**
** {F12506} If the authorizer code (the 2nd parameter to the authorizer
**          callback) is [SQLITE_READ] and the authorizer callback returns
**          [SQLITE_IGNORE] then the prepared statement is constructed to
**          insert a NULL value in place of the table column that would have
**          been read if [SQLITE_OK] had been returned.
**
** {F12507} If the authorizer code (the 2nd parameter to the authorizer
**          callback) is anything other than [SQLITE_READ], then
**          a return of [SQLITE_IGNORE] has the same effect as [SQLITE_DENY]. 
**
** {F12510} The first parameter to the authorizer callback is a copy of
**          the third parameter to the [sqlite3_set_authorizer()] interface.
**
** {F12511} The second parameter to the callback is an integer 
**          [SQLITE_COPY | action code] that specifies the particular action
**          to be authorized.
**
** {F12512} The third through sixth parameters to the callback are
**          zero-terminated strings that contain 
**          additional details about the action to be authorized.
**
** {F12520} Each call to [sqlite3_set_authorizer()] overrides the
**          any previously installed authorizer.
**
** {F12521} A NULL authorizer means that no authorization
**          callback is invoked.
**
** {F12522} The default authorizer is NULL.
*/
int sqlite3_set_authorizer(
  sqlite3*,
  int (*xAuth)(void*,int,const char*,const char*,const char*,const char*),
  void *pUserData
);

/*
** CAPI3REF: Authorizer Return Codes {F12590}
**
** The [sqlite3_set_authorizer | authorizer callback function] must
** return either [SQLITE_OK] or one of these two constants in order
** to signal SQLite whether or not the action is permitted.  See the
** [sqlite3_set_authorizer | authorizer documentation] for additional
** information.
*/
#define SQLITE_DENY   1   /* Abort the SQL statement with an error */
#define SQLITE_IGNORE 2   /* Don't allow access, but don't generate an error */

/*
** CAPI3REF: Authorizer Action Codes {F12550}
**
** The [sqlite3_set_authorizer()] interface registers a callback function
** that is invoked to authorizer certain SQL statement actions.  The
** second parameter to the callback is an integer code that specifies
** what action is being authorized.  These are the integer action codes that
** the authorizer callback may be passed.
**
** These action code values signify what kind of operation is to be 
** authorized.  The 3rd and 4th parameters to the authorization
** callback function will be parameters or NULL depending on which of these
** codes is used as the second parameter.  The 5th parameter to the
** authorizer callback is the name of the database ("main", "temp", 
** etc.) if applicable.  The 6th parameter to the authorizer callback
** is the name of the inner-most trigger or view that is responsible for
** the access attempt or NULL if this access attempt is directly from 
** top-level SQL code.
**
** INVARIANTS:
**
** {F12551} The second parameter to an 
**          [sqlite3_set_authorizer | authorizer callback is always an integer
**          [SQLITE_COPY | authorizer code] that specifies what action
**          is being authorized.
**
** {F12552} The 3rd and 4th parameters to the 
**          [sqlite3_set_authorizer | authorization callback function]
**          will be parameters or NULL depending on which 
**          [SQLITE_COPY | authorizer code] is used as the second parameter.
**
** {F12553} The 5th parameter to the
**          [sqlite3_set_authorizer | authorizer callback] is the name
**          of the database (example: "main", "temp", etc.) if applicable.
**
** {F12554} The 6th parameter to the
**          [sqlite3_set_authorizer | authorizer callback] is the name
**          of the inner-most trigger or view that is responsible for
**          the access attempt or NULL if this access attempt is directly from 
**          top-level SQL code.
*/
/******************************************* 3rd ************ 4th ***********/
#define SQLITE_CREATE_INDEX          1   /* Index Name      Table Name      */
#define SQLITE_CREATE_TABLE          2   /* Table Name      NULL            */
#define SQLITE_CREATE_TEMP_INDEX     3   /* Index Name      Table Name      */
#define SQLITE_CREATE_TEMP_TABLE     4   /* Table Name      NULL            */
#define SQLITE_CREATE_TEMP_TRIGGER   5   /* Trigger Name    Table Name      */
................................................................................
#define SQLITE_ANALYZE              28   /* Table Name      NULL            */
#define SQLITE_CREATE_VTABLE        29   /* Table Name      Module Name     */
#define SQLITE_DROP_VTABLE          30   /* Table Name      Module Name     */
#define SQLITE_FUNCTION             31   /* Function Name   NULL            */
#define SQLITE_COPY                  0   /* No longer used */

/*
** CAPI3REF: Tracing And Profiling Functions {F12280}
**
** These routines register callback functions that can be used for
** tracing and profiling the execution of SQL statements.
**
** The callback function registered by sqlite3_trace() is invoked at

** various times when an SQL statement is being run by [sqlite3_step()].
** The callback returns a UTF-8 rendering of the SQL statement text
** as the statement first begins executing.  Additional callbacks occur
** as each triggersubprogram is entered.  The callbacks for triggers
** contain a UTF-8 SQL comment that identifies the trigger.
** 
** The callback function registered by sqlite3_profile() is invoked
** as each SQL statement finishes.  The profile callback contains
** the original statement text and an estimate of wall-clock time
** of how long that statement took to run.
**
** The sqlite3_profile() API is currently considered experimental and
** is subject to change or removal in a future release.
**
** The trigger reporting feature of the trace callback is considered
** experimental and is subject to change or removal in future releases.
** Future versions of SQLite might also add new trace callback 
** invocations.
**
** INVARIANTS:
**
** {F12281} The callback function registered by [sqlite3_trace()] is
**          whenever an SQL statement first begins to execute and
**          whenever a trigger subprogram first begins to run.
**
** {F12282} Each call to [sqlite3_trace()] overrides the previously
**          registered trace callback.
**
** {F12283} A NULL trace callback disables tracing.
**
** {F12284} The first argument to the trace callback is a copy of
**          the pointer which was the 3rd argument to [sqlite3_trace()].
**
** {F12285} The second argument to the trace callback is a
**          zero-terminated UTF8 string containing the original text
**          of the SQL statement as it was passed into [sqlite3_prepare_v2()]
**          or the equivalent, or an SQL comment indicating the beginning
**          of a trigger subprogram.
**
** {F12287} The callback function registered by [sqlite3_profile()] is invoked
**          as each SQL statement finishes.
**
** {F12288} The first parameter to the profile callback is a copy of
**          the 3rd parameter to [sqlite3_profile()].
**
** {F12289} The second parameter to the profile callback is a
**          zero-terminated UTF-8 string that contains the complete text of
**          the SQL statement as it was processed by [sqlite3_prepare_v2()]
**          or the equivalent.
**
** {F12290} The third parameter to the profile  callback is an estimate
**          of the number of nanoseconds of wall-clock time required to
**          run the SQL statement from start to finish.
*/
void *sqlite3_trace(sqlite3*, void(*xTrace)(void*,const char*), void*);
void *sqlite3_profile(sqlite3*,
   void(*xProfile)(void*,const char*,sqlite3_uint64), void*);

/*
** CAPI3REF: Query Progress Callbacks {F12910}
**
** This routine configures a callback function - the
** progress callback - that is invoked periodically during long
** running calls to [sqlite3_exec()], [sqlite3_step()] and
** [sqlite3_get_table()].   An example use for this 
** interface is to keep a GUI updated during a large query.
**
** If the progress callback returns non-zero, the opertion is
** interrupted.  This feature can be used to implement a
** "Cancel" button on a GUI dialog box.
**
** INVARIANTS:
**
** {F12911} The callback function registered by [sqlite3_progress_handler()]
**          is invoked periodically during long running calls to
**          [sqlite3_step()].
**
** {F12912} The progress callback is invoked once for every N virtual
**          machine opcodes, where N is the second argument to 
**          the [sqlite3_progress_handler()] call that registered
**          the callback.  <todo>What if N is less than 1?</todo>
**
** {F12913} The progress callback itself is identified by the third
**          argument to [sqlite3_progress_handler()].
**
** {F12914} The fourth argument [sqlite3_progress_handler()] is a
***         void pointer passed to the progress callback
**          function each time it is invoked.
**

** {F12915} If a call to [sqlite3_step()] results in fewer than
**          N opcodes being executed,
**          then the progress callback is never invoked. {END}
** 

** {F12916} Every call to [sqlite3_progress_handler()]



**          overwrites any previously registere progress handler.
**
** {F12917} If the progress handler callback is NULL then no progress
**          handler is invoked.
**
** {F12918} If the progress callback returns a result other than 0, then





**          the behavior is a if [sqlite3_interrupt()] had been called.
*/
void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);

/*
** CAPI3REF: Opening A New Database Connection {F12700}
**
** These routines open an SQLite database file whose name
** is given by the filename argument.
** The filename argument is interpreted as UTF-8
** for [sqlite3_open()] and [sqlite3_open_v2()] and as UTF-16
** in the native byte order for [sqlite3_open16()].
** An [sqlite3*] handle is usually returned in *ppDb, even
** if an error occurs.  The only exception is if SQLite is unable
** to allocate memory to hold the [sqlite3] object, a NULL will
** be written into *ppDb instead of a pointer to the [sqlite3] object.
** If the database is opened (and/or created)
** successfully, then [SQLITE_OK] is returned.  Otherwise an
** error code is returned.  The
** [sqlite3_errmsg()] or [sqlite3_errmsg16()]  routines can be used to obtain
** an English language description of the error.
**

** The default encoding for the database will be UTF-8 if

** [sqlite3_open()] or [sqlite3_open_v2()] is called and
** UTF-16 in the native byte order if [sqlite3_open16()] is used.
**
** Whether or not an error occurs when it is opened, resources
** associated with the [sqlite3*] handle should be released by passing it
** to [sqlite3_close()] when it is no longer required.
**
** The [sqlite3_open_v2()] interface works like [sqlite3_open()] 
** except that it acccepts two additional parameters for additional control
** over the new database connection.  The flags parameter can be
** one of:
**
** <ol>
** <li>  [SQLITE_OPEN_READONLY]
** <li>  [SQLITE_OPEN_READWRITE]
** <li>  [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]
** </ol>
**
** The first value opens the database read-only. 
** If the database does not previously exist, an error is returned.
** The second option opens
** the database for reading and writing if possible, or reading only if
** if the file is write protected.  In either case the database
** must already exist or an error is returned.  The third option
** opens the database for reading and writing and creates it if it does
** not already exist.
** The third options is behavior that is always used for [sqlite3_open()]
** and [sqlite3_open16()].
**
** If the filename is ":memory:", then an private
** in-memory database is created for the connection.  This in-memory
** database will vanish when the database connection is closed.  Future
** version of SQLite might make use of additional special filenames
** that begin with the ":" character.  It is recommended that 
** when a database filename really does begin with
** ":" that you prefix the filename with a pathname like "./" to
** avoid ambiguity.
**
** If the filename is an empty string, then a private temporary
** on-disk database will be created.  This private database will be
** automatically deleted as soon as the database connection is closed.
**
** The fourth parameter to sqlite3_open_v2() is the name of the
** [sqlite3_vfs] object that defines the operating system 
** interface that the new database connection should use.  If the
** fourth parameter is a NULL pointer then the default [sqlite3_vfs]
** object is used.
**
** <b>Note to windows users:</b>  The encoding used for the filename argument
** of [sqlite3_open()] and [sqlite3_open_v2()] must be UTF-8, not whatever
** codepage is currently defined.  Filenames containing international
** characters must be converted to UTF-8 prior to passing them into
** [sqlite3_open()] or [sqlite3_open_v2()].
**
** INVARIANTS:
**
** {F12701} The [sqlite3_open()], [sqlite3_open16()], and
**          [sqlite3_open_v2()] interfaces create a new
**          [database connection] associated with
**          the database file given in their first parameter.
**
** {F12702} The filename argument is interpreted as UTF-8
**          for [sqlite3_open()] and [sqlite3_open_v2()] and as UTF-16
**          in the native byte order for [sqlite3_open16()].
**
** {F12703} A successful invocation of [sqlite3_open()], [sqlite3_open16()], 
**          or [sqlite3_open_v2()] writes a pointer to a new
**          [database connection] into *ppDb.
**
** {F12704} The [sqlite3_open()], [sqlite3_open16()], and
**          [sqlite3_open_v2()] interfaces return [SQLITE_OK] upon success,
**          or an appropriate [error code] on failure.
**
** {F12706} The default text encoding for a new database created using
**          [sqlite3_open()] or [sqlite3_open_v2()] will be UTF-8.
**
** {F12707} The default text encoding for a new database created using
**          [sqlite3_open16()] will be UTF-16.
**
** {F12709} The [sqlite3_open(F,D)] interface is equivalent to
**          [sqlite3_open_v2(F,D,G,0)] where the G parameter is
**          [SQLITE_OPEN_READWRITE]|[SQLITE_OPEN_CREATE].
**
** {F12711} If the G parameter to [sqlite3_open_v2(F,D,G,V)] contains the
**          bit value [SQLITE_OPEN_READONLY] then the database is opened
**          for reading only.
**
** {F12712} If the G parameter to [sqlite3_open_v2(F,D,G,V)] contains the
**          bit value [SQLITE_OPEN_READWRITE] then the database is opened
**          reading and writing if possible, or for reading only if the
**          file is write protected by the operating system.
**
** {F12713} If the G parameter to [sqlite3_open(v2(F,D,G,V)] omits the
**          bit value [SQLITE_OPEN_CREATE] and the database does not
**          previously exist, an error is returned.
**
** {F12714} If the G parameter to [sqlite3_open(v2(F,D,G,V)] contains the
**          bit value [SQLITE_OPEN_CREATE] and the database does not
**          previously exist, then an attempt is made to create and
**          initialize the database.
**
** {F12717} If the filename argument to [sqlite3_open()], [sqlite3_open16()],
**          or [sqlite3_open_v2()] is ":memory:", then an private,
**          ephemeral, in-memory database is created for the connection.
**          <todo>Is SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE required
**          in sqlite3_open_v2()?</todo>
**
** {F12719} If the filename is an empty string, then a private, ephermeral
**          on-disk database will be created.
**          <todo>Is SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE required
**          in sqlite3_open_v2()?</todo>
**
** {F12721} The [database connection] created by 
**          [sqlite3_open_v2(F,D,G,V)] will use the
**          [sqlite3_vfs] object identified by the V parameter, or
**          the default [sqlite3_vfs] object is V is a NULL pointer.
*/
int sqlite3_open(
  const char *filename,   /* Database filename (UTF-8) */
  sqlite3 **ppDb          /* OUT: SQLite db handle */
);
int sqlite3_open16(
  const void *filename,   /* Database filename (UTF-16) */
  sqlite3 **ppDb          /* OUT: SQLite db handle */
);
int sqlite3_open_v2(
  const char *filename,   /* Database filename (UTF-8) */
  sqlite3 **ppDb,         /* OUT: SQLite db handle */
  int flags,              /* Flags */
  const char *zVfs        /* Name of VFS module to use */
);

/*
** CAPI3REF: Error Codes And Messages {F12800}
**
** The sqlite3_errcode() interface returns the numeric
** [SQLITE_OK | result code] or [SQLITE_IOERR_READ | extended result code]
** for the most recent failed sqlite3_* API call associated
** with [sqlite3] handle 'db'. If a prior API call failed but the
** most recent API call succeeded, the return value from sqlite3_errcode()
** is undefined.
**
** The sqlite3_errmsg() and sqlite3_errmsg16() return English-language
** text that describes the error, as either UTF8 or UTF16 respectively.
** Memory to hold the error message string is managed internally.
** The application does not need to worry with freeing the result.
** However, the error string might be overwritten or deallocated b
** subsequent calls to other SQLite interface functions.
**

** INVARIANTS:
**
** {F12801} The [sqlite3_errcode(D)] interface returns the numeric
**          [SQLITE_OK | result code] or
**          [SQLITE_IOERR_READ | extended result code]
**          for the most recent failed interface call associated
**          with [sqlite3] handle D.
**
** {U12802} If a prior API call failed but the most recent API call
**          succeeded, the return value from [sqlite3_errcode()],
**          [sqlite3_errmsg()], and [sqlite3_errmsg16()] are undefined.
**
** {F12803} The [sqlite3_errmsg(D)] and [sqlite3_errmsg16(D)]
**          interfaces return English-language text that describes
**          the error in the mostly recently failed interface call,
**          encoded as either UTF8 or UTF16 respectively.
**
** {U12804} The strings returned by [sqlite3_errmsg()] and [sqlite3_errmsg16()]
**          are only valid until the next SQLite interface call.
**
** {F12807} Calls to [sqlite3_errcode()], [sqlite3_errmsg()], and
**          [sqlite3_errmsg16()] themselves do not affect the
**          results of future invocations of these routines.
**
** {F12808} Calls to API routines that do not return an error code
**          (example: [sqlite3_data_count()]) do not
**          change the error code or message returned by
**          [sqlite3_errcode()], [sqlite3_errmsg()], or [sqlite3_errmsg16()].
**



** {F12809} Interfaces that are not associated with a specific
**          [database connection] (examples:
**          [sqlite3_mprintf()] or [sqlite3_enable_shared_cache()]
**          do not change the values returned by
**          [sqlite3_errcode()], [sqlite3_errmsg()], or [sqlite3_errmsg16()].
*/
int sqlite3_errcode(sqlite3 *db);
const char *sqlite3_errmsg(sqlite3*);
const void *sqlite3_errmsg16(sqlite3*);

/*
** CAPI3REF: SQL Statement Object {F13000}
** KEYWORDS: {prepared statement} {prepared statements}
**
** An instance of this object represent single SQL statements.  This
** object is variously known as a "prepared statement" or a 
** "compiled SQL statement" or simply as a "statement".
** 
** The life of a statement object goes something like this:
**
** <ol>
** <li> Create the object using [sqlite3_prepare_v2()] or a related
**      function.
................................................................................
**
** Refer to documentation on individual methods above for additional
** information.
*/
typedef struct sqlite3_stmt sqlite3_stmt;

/*
** CAPI3REF: Compiling An SQL Statement {F13010}
**
** To execute an SQL query, it must first be compiled into a byte-code
** program using one of these routines. 
**
** The first argument "db" is an [database connection] 
** obtained from a prior call to [sqlite3_open()], [sqlite3_open_v2()]
** or [sqlite3_open16()]. 
** The second argument "zSql" is the statement to be compiled, encoded
** as either UTF-8 or UTF-16.  The sqlite3_prepare() and sqlite3_prepare_v2()
** interfaces uses UTF-8 and sqlite3_prepare16() and sqlite3_prepare16_v2()
** use UTF-16. {END}
**
** If the nByte argument is less
** than zero, then zSql is read up to the first zero terminator.
** If nByte is non-negative, then it is the maximum number of 
** bytes read from zSql.  When nByte is non-negative, the
** zSql string ends at either the first '\000' or '\u0000' character or 
** until the nByte-th byte, whichever comes first. {END}
**
** *pzTail is made to point to the first byte past the end of the
** first SQL statement in zSql.  These routines only compiles the first
** statement in zSql, so *pzTail is left pointing to what remains
** uncompiled.
**
** *ppStmt is left pointing to a compiled [prepared statement] that can be

** executed using [sqlite3_step()].  Or if there is an error, *ppStmt may be
** set to NULL.  If the input text contains no SQL (if the input
** is and empty string or a comment) then *ppStmt is set to NULL.
** {U13018} The calling procedure is responsible for deleting the
** compiled SQL statement
** using [sqlite3_finalize()] after it has finished with it.
**
** On success, [SQLITE_OK] is returned.  Otherwise an 
** [error code] is returned.
**
** The sqlite3_prepare_v2() and sqlite3_prepare16_v2() interfaces are
** recommended for all new programs. The two older interfaces are retained
** for backwards compatibility, but their use is discouraged.
** In the "v2" interfaces, the prepared statement
** that is returned (the [sqlite3_stmt] object) contains a copy of the 
** original SQL text. {END} This causes the [sqlite3_step()] interface to
** behave a differently in two ways:
**
** <ol>
** <li>
** If the database schema changes, instead of returning [SQLITE_SCHEMA] as it
** always used to do, [sqlite3_step()] will automatically recompile the SQL
** statement and try to run it again.  If the schema has changed in
** a way that makes the statement no longer valid, [sqlite3_step()] will still
** return [SQLITE_SCHEMA].  But unlike the legacy behavior, 
** [SQLITE_SCHEMA] is now a fatal error.  Calling
** [sqlite3_prepare_v2()] again will not make the
** error go away.  Note: use [sqlite3_errmsg()] to find the text
** of the parsing error that results in an [SQLITE_SCHEMA] return. {END}
** </li>
**
** <li>
** When an error occurs, 
** [sqlite3_step()] will return one of the detailed 
** [error codes] or [extended error codes]. 

** The legacy behavior was that [sqlite3_step()] would only return a generic
** [SQLITE_ERROR] result code and you would have to make a second call to
** [sqlite3_reset()] in order to find the underlying cause of the problem.
** With the "v2" prepare interfaces, the underlying reason for the error is
** returned immediately.
** </li>
** </ol>
**
** INVARIANTS:
**
** {F13011} The [sqlite3_prepare(db,zSql,...)] and
**          [sqlite3_prepare_v2(db,zSql,...)] interfaces interpret the
**          text in their zSql parameter as UTF-8.
**
** {F13012} The [sqlite3_prepare16(db,zSql,...)] and
**          [sqlite3_prepare16_v2(db,zSql,...)] interfaces interpret the
**          text in their zSql parameter as UTF-16 in the native byte order.
**
** {F13013} If the nByte argument to [sqlite3_prepare_v2(db,zSql,nByte,...)]
**          and its variants is less than zero, then SQL text is
**          read from zSql is read up to the first zero terminator.
**
** {F13014} If the nByte argument to [sqlite3_prepare_v2(db,zSql,nByte,...)]
**          and its variants is non-negative, then nBytes bytes
**          SQL text is read from zSql.
**
** {F13015} In [sqlite3_prepare_v2(db,zSql,N,P,pzTail)] and its variants
**          if the zSql input text contains more than one SQL statement
**          and pzTail is not NULL, then *pzTail is made to point to the
**          first byte past the end of the first SQL statement in zSql.
**          <todo>What does *pzTail point to if there is one statement?</todo>
**
** {F13016} A successful call to [sqlite3_prepare_v2(db,zSql,N,ppStmt,...)]
**          or one of its variants writes into *ppStmt a pointer to a new
**          [prepared statement] or a pointer to NULL
**          if zSql contains nothing other than whitespace or comments. 
**
** {F13019} The [sqlite3_prepare_v2()] interface and its variants return
**          [SQLITE_OK] or an appropriate [error code] upon failure.
*/
int sqlite3_prepare(
  sqlite3 *db,            /* Database handle */
  const char *zSql,       /* SQL statement, UTF-8 encoded */
  int nByte,              /* Maximum length of zSql in bytes. */
  sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
  const char **pzTail     /* OUT: Pointer to unused portion of zSql */
................................................................................
  const void *zSql,       /* SQL statement, UTF-16 encoded */
  int nByte,              /* Maximum length of zSql in bytes. */
  sqlite3_stmt **ppStmt,  /* OUT: Statement handle */
  const void **pzTail     /* OUT: Pointer to unused portion of zSql */
);

/*
** CAPIREF: Retrieving Statement SQL {F13100}
**
** This intereface can be used to retrieve a saved copy of the original
** SQL text used to create a [prepared statement].
**
** INVARIANTS:
**
** {F13101} If the [prepared statement] passed as 
**          the an argument to [sqlite3_sql()] was compiled
**          compiled using either [sqlite3_prepare_v2()] or
**          [sqlite3_prepare16_v2()],
**          then [sqlite3_sql()] function returns a pointer to a
**          zero-terminated string containing a UTF-8 rendering
**          of the original SQL statement.
**
** {F13102} If the [prepared statement] passed as 
**          the an argument to [sqlite3_sql()] was compiled
**          compiled using either [sqlite3_prepare()] or
**          [sqlite3_prepare16()],
**          then [sqlite3_sql()] function returns a NULL pointer.
**
** {F13103} The string returned by [sqlite3_sql(S)] is valid until the
**          [prepared statement] S is deleted using [sqlite3_finalize(S)].
*/
const char *sqlite3_sql(sqlite3_stmt *pStmt);

/*
** CAPI3REF:  Dynamically Typed Value Object  {F15000}
**
** SQLite uses the sqlite3_value object to represent all values
** that are or can be stored in a database table.
** SQLite uses dynamic typing for the values it stores.  
** Values stored in sqlite3_value objects can be
** be integers, floating point values, strings, BLOBs, or NULL.


*/
typedef struct Mem sqlite3_value;

/*
** CAPI3REF:  SQL Function Context Object {F16001}
**
** The context in which an SQL function executes is stored in an
** sqlite3_context object.  A pointer to an sqlite3_context
** object is always first parameter to application-defined SQL functions.
*/
typedef struct sqlite3_context sqlite3_context;

/*
** CAPI3REF:  Binding Values To Prepared Statements {F13500}
**
** In the SQL strings input to [sqlite3_prepare_v2()] and its
** variants, literals may be replace by a parameter in one
** of these forms:
**
** <ul>
** <li>  ?
** <li>  ?NNN
** <li>  :VVV
** <li>  @VVV
** <li>  $VVV
** </ul>
**
** In the parameter forms shown above NNN is an integer literal,
** VVV alpha-numeric parameter name.

** The values of these parameters (also called "host parameter names"
** or "SQL parameters")
** can be set using the sqlite3_bind_*() routines defined here.
**
** The first argument to the sqlite3_bind_*() routines always
** is a pointer to the [sqlite3_stmt] object returned from
** [sqlite3_prepare_v2()] or its variants. The second
** argument is the index of the parameter to be set. The
** first parameter has an index of 1.  When the same named
** parameter is used more than once, second and subsequent

** occurrences have the same index as the first occurrence. 
** The index for named parameters can be looked up using the
** [sqlite3_bind_parameter_name()] API if desired.  The index
** for "?NNN" parameters is the value of NNN.
** The NNN value must be between 1 and the compile-time
** parameter SQLITE_MAX_VARIABLE_NUMBER (default value: 999).

**
** The third argument is the value to bind to the parameter.
**
** In those
** routines that have a fourth argument, its value is the number of bytes
** in the parameter.  To be clear: the value is the number of <u>bytes</u>
** in the value, not the number of characters.   The number
** of bytes does not include the zero-terminator at the end of strings.
** If the fourth parameter is negative, the length of the string is
** number of bytes up to the first zero terminator.
**
** The fifth argument to sqlite3_bind_blob(), sqlite3_bind_text(), and
** sqlite3_bind_text16() is a destructor used to dispose of the BLOB or
** string after SQLite has finished with it. If the fifth argument is
** the special value [SQLITE_STATIC], then SQLite assumes that the
** information is in static, unmanaged space and does not need to be freed.
** If the fifth argument has the value [SQLITE_TRANSIENT], then
** SQLite makes its own private copy of the data immediately, before
** the sqlite3_bind_*() routine returns.
**
** The sqlite3_bind_zeroblob() routine binds a BLOB of length N that
** is filled with zeros.  A zeroblob uses a fixed amount of memory
** (just an integer to hold it size) while it is being processed.
** Zeroblobs are intended to serve as place-holders for BLOBs whose
** content is later written using 
** [sqlite3_blob_open | increment BLOB I/O] routines. A negative
** value for the zeroblob results in a zero-length BLOB.
**
** The sqlite3_bind_*() routines must be called after
** [sqlite3_prepare_v2()] (and its variants) or [sqlite3_reset()] and
** before [sqlite3_step()].
** Bindings are not cleared by the [sqlite3_reset()] routine.
** Unbound parameters are interpreted as NULL.
**
** These routines return [SQLITE_OK] on success or an error code if
** anything goes wrong.  [SQLITE_RANGE] is returned if the parameter
** index is out of range.  [SQLITE_NOMEM] is returned if malloc fails.
** [SQLITE_MISUSE] might be returned if these routines are called on a
** virtual machine that is the wrong state or which has already been finalized.
** Detection of misuse is unreliable.  Applications should not depend
** on SQLITE_MISUSE returns.  SQLITE_MISUSE is intended to indicate a
** a logic error in the application.  Future versions of SQLite might
** panic rather than return SQLITE_MISUSE.
**
** See also: [sqlite3_bind_parameter_count()],
** [sqlite3_bind_parameter_name()], and
** [sqlite3_bind_parameter_index()].
**
** INVARIANTS:
**
** {F13506} The [sqlite3_prepare | SQL statement compiler] recognizes
**          tokens of the forms "?", "?NNN", "$VVV", ":VVV", and "@VVV"
**          as SQL parameters, where NNN is any sequence of one or more
**          digits and where VVV is any sequence of one or more 
**          alphanumeric characters or "::" optionally followed by
**          a string containing no spaces and contained within parentheses.
**
** {F13509} The initial value of an SQL parameter is NULL.
**
** {F13512} The index of an "?" SQL parameter is one larger than the
**          largest index of SQL parameter to the left, or 1 if
**          the "?" is the leftmost SQL parameter.
**
** {F13515} The index of an "?NNN" SQL parameter is the integer NNN.
**
** {F13518} The index of an ":VVV", "$VVV", or "@VVV" SQL parameter is
**          the same as the index of leftmost occurances of the same
**          parameter, or one more than the largest index over all
**          parameters to the left if this is the first occurrance
**          of this parameter, or 1 if this is the leftmost parameter.
**
** {F13521} The [sqlite3_prepare | SQL statement compiler] fail with
**          an [SQLITE_RANGE] error if the index of an SQL parameter
**          is less than 1 or greater than SQLITE_MAX_VARIABLE_NUMBER.
**
** {F13524} Calls to [sqlite3_bind_text | sqlite3_bind(S,N,V,...)]
**          associate the value V with all SQL parameters having an
**          index of N in the [prepared statement] S.
**
** {F13527} Calls to [sqlite3_bind_text | sqlite3_bind(S,N,...)]
**          override prior calls with the same values of S and N.
**
** {F13530} Bindings established by [sqlite3_bind_text | sqlite3_bind(S,...)]
**          persist across calls to [sqlite3_reset(S)].
**
** {F13533} In calls to [sqlite3_bind_blob(S,N,V,L,D)],
**          [sqlite3_bind_text(S,N,V,L,D)], or
**          [sqlite3_bind_text16(S,N,V,L,D)] SQLite binds the first L
**          bytes of the blob or string pointed to by V, when L
**          is non-negative.
**
** {F13536} In calls to [sqlite3_bind_text(S,N,V,L,D)] or
**          [sqlite3_bind_text16(S,N,V,L,D)] SQLite binds characters
**          from V through the first zero character when L is negative.
**
** {F13539} In calls to [sqlite3_bind_blob(S,N,V,L,D)],
**          [sqlite3_bind_text(S,N,V,L,D)], or
**          [sqlite3_bind_text16(S,N,V,L,D)] when D is the special
**          constant [SQLITE_STATIC], SQLite assumes that the value V
**          is held in static unmanaged space that will not change
**          during the lifetime of the binding.
**
** {F13542} In calls to [sqlite3_bind_blob(S,N,V,L,D)],
**          [sqlite3_bind_text(S,N,V,L,D)], or
**          [sqlite3_bind_text16(S,N,V,L,D)] when D is the special
**          constant [SQLITE_TRANSIENT], the routine makes a 
**          private copy of V value before it returns.
**
** {F13545} In calls to [sqlite3_bind_blob(S,N,V,L,D)],
**          [sqlite3_bind_text(S,N,V,L,D)], or
**          [sqlite3_bind_text16(S,N,V,L,D)] when D is a pointer to
**          a function, SQLite invokes that function to destroy the
**          V value after it has finished using the V value.
**
** {F13548} In calls to [sqlite3_bind_zeroblob(S,N,V,L)] the value bound
**          is a blob of L bytes, or a zero-length blob if L is negative.
*/
int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*));
int sqlite3_bind_double(sqlite3_stmt*, int, double);
int sqlite3_bind_int(sqlite3_stmt*, int, int);
int sqlite3_bind_int64(sqlite3_stmt*, int, sqlite3_int64);
int sqlite3_bind_null(sqlite3_stmt*, int);
int sqlite3_bind_text(sqlite3_stmt*, int, const char*, int n, void(*)(void*));
int sqlite3_bind_text16(sqlite3_stmt*, int, const void*, int, void(*)(void*));
int sqlite3_bind_value(sqlite3_stmt*, int, const sqlite3_value*);
int sqlite3_bind_zeroblob(sqlite3_stmt*, int, int n);

/*
** CAPI3REF: Number Of SQL Parameters {F13600}
**
** This routine can be used to find the number of SQL parameters
** in a prepared statement.  SQL parameters are tokens of the
** form "?", "?NNN", ":AAA", "$AAA", or "@AAA" that serve as
** place-holders for values that are [sqlite3_bind_blob | bound]
** to the parameters at a later time.
**
** This routine actually returns the index of the largest parameter.
** For all forms except ?NNN, this will correspond to the number of
** unique parameters.  If parameters of the ?NNN are used, there may
** be gaps in the list.
**
** See also: [sqlite3_bind_blob|sqlite3_bind()],
** [sqlite3_bind_parameter_name()], and
** [sqlite3_bind_parameter_index()].
**
** INVARIANTS:
**
** {F13601} The [sqlite3_bind_parameter_count(S)] interface returns
**          the largest index of all SQL parameters in the
**          [prepared statement] S, or 0 if S
**          contains no SQL parameters.
*/
int sqlite3_bind_parameter_count(sqlite3_stmt*);

/*
** CAPI3REF: Name Of A Host Parameter {F13620}
**
** This routine returns a pointer to the name of the n-th

** SQL parameter in a [prepared statement].
** SQL parameters of the form ":AAA" or "@AAA" or "$AAA" have a name
** which is the string ":AAA" or "@AAA" or "$VVV". 
** In other words, the initial ":" or "$" or "@"
** is included as part of the name.
** Parameters of the form "?" or "?NNN" have no name.
**
** The first host parameter has an index of 1, not 0.
**
** If the value n is out of range or if the n-th parameter is
** nameless, then NULL is returned.  The returned string is
** always in the UTF-8 encoding even if the named parameter was
** originally specified as UTF-16 in [sqlite3_prepare16()] or
** [sqlite3_prepare16_v2()].
**
** See also: [sqlite3_bind_blob|sqlite3_bind()],
** [sqlite3_bind_parameter_count()], and
** [sqlite3_bind_parameter_index()].
**
** INVARIANTS:
**
** {F13621} The [sqlite3_bind_parameter_name(S,N)] interface returns
**          a UTF-8 rendering of the name of the SQL parameter in
**          [prepared statement] S having index N, or
**          NULL if there is no SQL parameter with index N or if the
**          parameter with index N is an anonymous parameter "?" or
**          a numbered parameter "?NNN".
*/
const char *sqlite3_bind_parameter_name(sqlite3_stmt*, int);

/*
** CAPI3REF: Index Of A Parameter With A Given Name {F13640}
**
** Return the index of an SQL parameter given its name.  The
** index value returned is suitable for use as the second
** parameter to [sqlite3_bind_blob|sqlite3_bind()].  A zero
** is returned if no matching parameter is found.  The parameter
** name must be given in UTF-8 even if the original statement
** was prepared from UTF-16 text using [sqlite3_prepare16_v2()].
**
** See also: [sqlite3_bind_blob|sqlite3_bind()],
** [sqlite3_bind_parameter_count()], and
** [sqlite3_bind_parameter_index()].
**
** INVARIANTS:
**
** {F13641} The [sqlite3_bind_parameter_index(S,N)] interface returns
**          the index of SQL parameter in [prepared statement]
**          S whose name matches the UTF-8 string N, or 0 if there is
**          no match.
*/
int sqlite3_bind_parameter_index(sqlite3_stmt*, const char *zName);

/*
** CAPI3REF: Reset All Bindings On A Prepared Statement {F13660}
**
** Contrary to the intuition of many, [sqlite3_reset()] does not
** reset the [sqlite3_bind_blob | bindings] on a 
** [prepared statement].  Use this routine to
** reset all host parameters to NULL.
**
** INVARIANTS:
**
** {F13661} The [sqlite3_clear_bindings(S)] interface resets all
**          SQL parameter bindings in [prepared statement] S
**          back to NULL.
*/
int sqlite3_clear_bindings(sqlite3_stmt*);

/*
** CAPI3REF: Number Of Columns In A Result Set {F13710}
**
** Return the number of columns in the result set returned by the 
** [prepared statement]. This routine returns 0
** if pStmt is an SQL statement that does not return data (for 
** example an UPDATE).
**
** INVARIANTS:
**
** {F13711} The [sqlite3_column_count(S)] interface returns the number of
**          columns in the result set generated by the
**          [prepared statement] S, or 0 if S does not generate
**          a result set.
*/
int sqlite3_column_count(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Column Names In A Result Set {F13720}
**
** These routines return the name assigned to a particular column
** in the result set of a SELECT statement.  The sqlite3_column_name()
** interface returns a pointer to a zero-terminated UTF8 string
** and sqlite3_column_name16() returns a pointer to a zero-terminated
** UTF16 string.  The first parameter is the
** [prepared statement] that implements the SELECT statement.
** The second parameter is the column number.  The left-most column is
** number 0.
**
** The returned string pointer is valid until either the 
** [prepared statement] is destroyed by [sqlite3_finalize()]
** or until the next call sqlite3_column_name() or sqlite3_column_name16()
** on the same column.
**
** If sqlite3_malloc() fails during the processing of either routine
** (for example during a conversion from UTF-8 to UTF-16) then a
** NULL pointer is returned.
**
** The name of a result column is the value of the "AS" clause for
** that column, if there is an AS clause.  If there is no AS clause
** then the name of the column is unspecified and may change from
** one release of SQLite to the next.
**
** INVARIANTS:
**
** {F13721} A successful invocation of the [sqlite3_column_name(S,N)]
**          interface returns the name
**          of the Nth column (where 0 is the left-most column) for the
**          result set of [prepared statement] S as a
**          zero-terminated UTF-8 string.
**
** {F13723} A successful invocation of the [sqlite3_column_name16(S,N)]
**          interface returns the name
**          of the Nth column (where 0 is the left-most column) for the
**          result set of [prepared statement] S as a
**          zero-terminated UTF-16 string in the native byte order.
**
** {F13724} The [sqlite3_column_name()] and [sqlite3_column_name16()]
**          interfaces return a NULL pointer if they are unable to
**          allocate memory memory to hold there normal return strings.
**
** {F13725} If the N parameter to [sqlite3_column_name(S,N)] or
**          [sqlite3_column_name16(S,N)] is out of range, then the
**          interfaces returns a NULL pointer.
** 
** {F13726} The strings returned by [sqlite3_column_name(S,N)] and
**          [sqlite3_column_name16(S,N)] are valid until the next
**          call to either routine with the same S and N parameters
**          or until [sqlite3_finalize(S)] is called.
**
** {F13727} When a result column of a [SELECT] statement contains
**          an AS clause, the name of that column is the indentifier
**          to the right of the AS keyword.
*/
const char *sqlite3_column_name(sqlite3_stmt*, int N);
const void *sqlite3_column_name16(sqlite3_stmt*, int N);

/*
** CAPI3REF: Source Of Data In A Query Result {F13740}
**
** These routines provide a means to determine what column of what
** table in which database a result of a SELECT statement comes from.
** The name of the database or table or column can be returned as
** either a UTF8 or UTF16 string.  The _database_ routines return
** the database name, the _table_ routines return the table name, and
** the origin_ routines return the column name.
** The returned string is valid until
** the [prepared statement] is destroyed using
** [sqlite3_finalize()] or until the same information is requested
** again in a different encoding.
**
** The names returned are the original un-aliased names of the
** database, table, and column.
**
** The first argument to the following calls is a [prepared statement].

** These functions return information about the Nth column returned by 
** the statement, where N is the second function argument.
**
** If the Nth column returned by the statement is an expression
** or subquery and is not a column value, then all of these functions
** return NULL.  These routine might also return NULL if a memory
** allocation error occurs.  Otherwise, they return the 
** name of the attached database, table and column that query result
** column was extracted from.
**
** As with all other SQLite APIs, those postfixed with "16" return
** UTF-16 encoded strings, the other functions return UTF-8. {END}
**
** These APIs are only available if the library was compiled with the 
** SQLITE_ENABLE_COLUMN_METADATA preprocessor symbol defined.
**
** {U13751}
** If two or more threads call one or more of these routines against the same
** prepared statement and column at the same time then the results are
** undefined.
**
** INVARIANTS:
**
** {F13741} The [sqlite3_column_database_name(S,N)] interface returns either
**          the UTF-8 zero-terminated name of the database from which the 
**          Nth result column of [prepared statement] S 
**          is extracted, or NULL if the the Nth column of S is a
**          general expression or if unable to allocate memory
**          to store the name.
**          
** {F13742} The [sqlite3_column_database_name16(S,N)] interface returns either
**          the UTF-16 native byte order
**          zero-terminated name of the database from which the 
**          Nth result column of [prepared statement] S 
**          is extracted, or NULL if the the Nth column of S is a
**          general expression or if unable to allocate memory
**          to store the name.
**          
** {F13743} The [sqlite3_column_table_name(S,N)] interface returns either
**          the UTF-8 zero-terminated name of the table from which the 
**          Nth result column of [prepared statement] S 
**          is extracted, or NULL if the the Nth column of S is a
**          general expression or if unable to allocate memory
**          to store the name.
**          
** {F13744} The [sqlite3_column_table_name16(S,N)] interface returns either
**          the UTF-16 native byte order
**          zero-terminated name of the table from which the 
**          Nth result column of [prepared statement] S 
**          is extracted, or NULL if the the Nth column of S is a
**          general expression or if unable to allocate memory
**          to store the name.
**          
** {F13745} The [sqlite3_column_origin_name(S,N)] interface returns either
**          the UTF-8 zero-terminated name of the table column from which the 
**          Nth result column of [prepared statement] S 
**          is extracted, or NULL if the the Nth column of S is a
**          general expression or if unable to allocate memory
**          to store the name.
**          
** {F13746} The [sqlite3_column_origin_name16(S,N)] interface returns either
**          the UTF-16 native byte order
**          zero-terminated name of the table column from which the 
**          Nth result column of [prepared statement] S 
**          is extracted, or NULL if the the Nth column of S is a
**          general expression or if unable to allocate memory
**          to store the name.
**          
** {F13748} The return values from
**          [sqlite3_column_database_name|column metadata interfaces]
**          are valid
**          for the lifetime of the [prepared statement]
**          or until the encoding is changed by another metadata
**          interface call for the same prepared statement and column.
**
** LIMITATIONS:
**
** {U13751} If two or more threads call one or more
**          [sqlite3_column_database_name|column metadata interfaces]
**          the same [prepared statement] and result column
**          at the same time then the results are undefined.
*/
const char *sqlite3_column_database_name(sqlite3_stmt*,int);
const void *sqlite3_column_database_name16(sqlite3_stmt*,int);
const char *sqlite3_column_table_name(sqlite3_stmt*,int);
const void *sqlite3_column_table_name16(sqlite3_stmt*,int);
const char *sqlite3_column_origin_name(sqlite3_stmt*,int);
const void *sqlite3_column_origin_name16(sqlite3_stmt*,int);

/*
** CAPI3REF: Declared Datatype Of A Query Result {F13760}
**
** The first parameter is a [prepared statement]. 
** If this statement is a SELECT statement and the Nth column of the 
** returned result set of that SELECT is a table column (not an
** expression or subquery) then the declared type of the table
** column is returned.  If the Nth column of the result set is an
** expression or subquery, then a NULL pointer is returned.
** The returned string is always UTF-8 encoded.  {END} 
** For example, in the database schema:
**
** CREATE TABLE t1(c1 VARIANT);
**
** And the following statement compiled:
**
** SELECT c1 + 1, c1 FROM t1;
**
................................................................................
**
** SQLite uses dynamic run-time typing.  So just because a column
** is declared to contain a particular type does not mean that the
** data stored in that column is of the declared type.  SQLite is
** strongly typed, but the typing is dynamic not static.  Type
** is associated with individual values, not with the containers
** used to hold those values.
**
** INVARIANTS:
**
** {F13761}  A successful call to [sqlite3_column_decltype(S,N)]
**           returns a zero-terminated UTF-8 string containing the
**           the declared datatype of the table column that appears
**           as the Nth column (numbered from 0) of the result set to the
**           [prepared statement] S.
**
** {F13762}  A successful call to [sqlite3_column_decltype16(S,N)]
**           returns a zero-terminated UTF-16 native byte order string
**           containing the declared datatype of the table column that appears
**           as the Nth column (numbered from 0) of the result set to the
**           [prepared statement] S.
**
** {F13763}  If N is less than 0 or N is greater than or equal to
**           the number of columns in [prepared statement] S
**           or if the Nth column of S is an expression or subquery rather
**           than a table column or if a memory allocation failure
**           occurs during encoding conversions, then
**           calls to [sqlite3_column_decltype(S,N)] or
**           [sqlite3_column_decltype16(S,N)] return NULL.
*/
const char *sqlite3_column_decltype(sqlite3_stmt*,int);
const void *sqlite3_column_decltype16(sqlite3_stmt*,int);

/* 
** CAPI3REF:  Evaluate An SQL Statement {F13200}
**
** After an [prepared statement] has been prepared with a call
** to either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] or to one of
** the legacy interfaces [sqlite3_prepare()] or [sqlite3_prepare16()],
** then this function must be called one or more times to evaluate the 
** statement.
**
** The details of the behavior of this sqlite3_step() interface depend
** on whether the statement was prepared using the newer "v2" interface
................................................................................
** 
** [SQLITE_ERROR] means that a run-time error (such as a constraint
** violation) has occurred.  sqlite3_step() should not be called again on
** the VM. More information may be found by calling [sqlite3_errmsg()].
** With the legacy interface, a more specific error code (example:
** [SQLITE_INTERRUPT], [SQLITE_SCHEMA], [SQLITE_CORRUPT], and so forth)
** can be obtained by calling [sqlite3_reset()] on the
** [prepared statement].  In the "v2" interface,
** the more specific error code is returned directly by sqlite3_step().
**
** [SQLITE_MISUSE] means that the this routine was called inappropriately.
** Perhaps it was called on a [prepared statement] that has
** already been [sqlite3_finalize | finalized] or on one that had 
** previously returned [SQLITE_ERROR] or [SQLITE_DONE].  Or it could
** be the case that the same database connection is being used by two or
** more threads at the same moment in time.
**
** <b>Goofy Interface Alert:</b>
** In the legacy interface, 
** the sqlite3_step() API always returns a generic error code,
** [SQLITE_ERROR], following any error other than [SQLITE_BUSY]
** and [SQLITE_MISUSE].  You must call [sqlite3_reset()] or
** [sqlite3_finalize()] in order to find one of the specific
** [error codes] that better describes the error.
** We admit that this is a goofy design.  The problem has been fixed
** with the "v2" interface.  If you prepare all of your SQL statements
** using either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] instead
** of the legacy [sqlite3_prepare()] and [sqlite3_prepare16()], then the 
** more specific [error codes] are returned directly
** by sqlite3_step().  The use of the "v2" interface is recommended.
**
** INVARIANTS:
**
** {F13202}  If [prepared statement] S is ready to be
**           run, then [sqlite3_step(S)] advances that prepared statement
**           until to completion or until it is ready to return another
**           row of the result set or an interrupt or run-time error occurs.
**
** {F15304}  When a call to [sqlite3_step(S)] causes the 
**           [prepared statement] S to run to completion,
**           the function returns [SQLITE_DONE].
**
** {F15306}  When a call to [sqlite3_step(S)] stops because it is ready
**           to return another row of the result set, it returns
**           [SQLITE_ROW].
**
** {F15308}  If a call to [sqlite3_step(S)] encounters an
**           [sqlite3_interrupt|interrupt] or a run-time error,
**           it returns an appropraite error code that is not one of
**           [SQLITE_OK], [SQLITE_ROW], or [SQLITE_DONE].
**
** {F15310}  If an [sqlite3_interrupt|interrupt] or run-time error
**           occurs during a call to [sqlite3_step(S)]
**           for a [prepared statement] S created using
**           legacy interfaces [sqlite3_prepare()] or
**           [sqlite3_prepare16()] then the function returns either
**           [SQLITE_ERROR], [SQLITE_BUSY], or [SQLITE_MISUSE].
*/
int sqlite3_step(sqlite3_stmt*);

/*
** CAPI3REF: Number of columns in a result set {F13770}
**
** Return the number of values in the current row of the result set.
**
** INVARIANTS:
**
** {F13771}  After a call to [sqlite3_step(S)] that returns
**           [SQLITE_ROW], the [sqlite3_data_count(S)] routine
**           will return the same value as the

**           [sqlite3_column_count(S)] function.
**
** {F13772}  After [sqlite3_step(S)] has returned any value other than
**           [SQLITE_ROW] or before [sqlite3_step(S)] has been 
**           called on the [prepared statement] for
**           the first time since it was [sqlite3_prepare|prepared]
**           or [sqlite3_reset|reset], the [sqlite3_data_count(S)]
**           routine returns zero.
*/
int sqlite3_data_count(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Fundamental Datatypes {F10265}
** KEYWORDS: SQLITE_TEXT
**
** {F10266}Every value in SQLite has one of five fundamental datatypes:
**
** <ul>
** <li> 64-bit signed integer
** <li> 64-bit IEEE floating point number
** <li> string
** <li> BLOB
** <li> NULL
** </ul> {END}
**
** These constants are codes for each of those types.
**
** Note that the SQLITE_TEXT constant was also used in SQLite version 2
** for a completely different meaning.  Software that links against both
** SQLite version 2 and SQLite version 3 should use SQLITE3_TEXT not
** SQLITE_TEXT.
................................................................................
# undef SQLITE_TEXT
#else
# define SQLITE_TEXT     3
#endif
#define SQLITE3_TEXT     3

/*
** CAPI3REF: Results Values From A Query {F13800}
**
** These routines form the "result set query" interface.
**
** These routines return information about
** a single column of the current result row of a query.  In every
** case the first argument is a pointer to the 
** [prepared statement] that is being
** evaluated (the [sqlite3_stmt*] that was returned from 
** [sqlite3_prepare_v2()] or one of its variants) and
** the second argument is the index of the column for which information 
** should be returned.  The left-most column of the result set
** has an index of 0.
**
** If the SQL statement is not currently point to a valid row, or if the
** the column index is out of range, the result is undefined. 
** These routines may only be called when the most recent call to
** [sqlite3_step()] has returned [SQLITE_ROW] and neither
** [sqlite3_reset()] nor [sqlite3_finalize()] has been call subsequently.
** If any of these routines are called after [sqlite3_reset()] or
** [sqlite3_finalize()] or after [sqlite3_step()] has returned
** something other than [SQLITE_ROW], the results are undefined.
** If [sqlite3_step()] or [sqlite3_reset()] or [sqlite3_finalize()]
** are called from a different thread while any of these routines
** are pending, then the results are undefined.  
**
** The sqlite3_column_type() routine returns 
** [SQLITE_INTEGER | datatype code] for the initial data type
** of the result column.  The returned value is one of [SQLITE_INTEGER],
** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL].  The value
** returned by sqlite3_column_type() is only meaningful if no type
** conversions have occurred as described below.  After a type conversion,
................................................................................
** the string to UTF-8 and then returns the number of bytes.
** If the result is a numeric value then sqlite3_column_bytes() uses
** [sqlite3_snprintf()] to convert that value to a UTF-8 string and returns
** the number of bytes in that string.
** The value returned does not include the zero terminator at the end
** of the string.  For clarity: the value returned is the number of
** bytes in the string, not the number of characters.
**
** Strings returned by sqlite3_column_text() and sqlite3_column_text16(),
** even empty strings, are always zero terminated.  The return
** value from sqlite3_column_blob() for a zero-length blob is an arbitrary
** pointer, possibly even a NULL pointer.
**
** The sqlite3_column_bytes16() routine is similar to sqlite3_column_bytes()
** but leaves the result in UTF-16 in native byte order instead of UTF-8.  
** The zero terminator is not included in this count.
**
** These routines attempt to convert the value where appropriate.  For
** example, if the internal representation is FLOAT and a text result
** is requested, [sqlite3_snprintf()] is used internally to do the conversion
** automatically.  The following table details the conversions that
** are applied:
**
** <blockquote>
** <table border="1">
** <tr><th> Internal<br>Type <th> Requested<br>Type <th>  Conversion

**
** <tr><td>  NULL    <td> INTEGER   <td> Result is 0
** <tr><td>  NULL    <td>  FLOAT    <td> Result is 0.0
** <tr><td>  NULL    <td>   TEXT    <td> Result is NULL pointer
** <tr><td>  NULL    <td>   BLOB    <td> Result is NULL pointer
** <tr><td> INTEGER  <td>  FLOAT    <td> Convert from integer to float
** <tr><td> INTEGER  <td>   TEXT    <td> ASCII rendering of the integer
................................................................................
**
** In other words, you should call sqlite3_column_text(), sqlite3_column_blob(),
** or sqlite3_column_text16() first to force the result into the desired
** format, then invoke sqlite3_column_bytes() or sqlite3_column_bytes16() to
** find the size of the result.  Do not mix call to sqlite3_column_text() or
** sqlite3_column_blob() with calls to sqlite3_column_bytes16().  And do not
** mix calls to sqlite3_column_text16() with calls to sqlite3_column_bytes().
**
** The pointers returned are valid until a type conversion occurs as
** described above, or until [sqlite3_step()] or [sqlite3_reset()] or
** [sqlite3_finalize()] is called.  The memory space used to hold strings
** and blobs is freed automatically.  Do <b>not</b> pass the pointers returned
** [sqlite3_column_blob()], [sqlite3_column_text()], etc. into 
** [sqlite3_free()].
**
** If a memory allocation error occurs during the evaluation of any
** of these routines, a default value is returned.  The default value
** is either the integer 0, the floating point number 0.0, or a NULL
** pointer.  Subsequent calls to [sqlite3_errcode()] will return
** [SQLITE_NOMEM].
**
** INVARIANTS:
**
** {F13803} The [sqlite3_column_blob(S,N)] interface converts the
**          Nth column in the current row of the result set for
**          [prepared statement] S into a blob and then returns a
**          pointer to the converted value.
**
** {F13806} The [sqlite3_column_bytes(S,N)] interface returns the
**          number of bytes in the blob or string (exclusive of the
**          zero terminator on the string) that was returned by the
**          most recent call to [sqlite3_column_blob(S,N)] or
**          [sqlite3_column_text(S,N)].
**
** {F13809} The [sqlite3_column_bytes16(S,N)] interface returns the
**          number of bytes in the string (exclusive of the
**          zero terminator on the string) that was returned by the
**          most recent call to [sqlite3_column_text16(S,N)].
**
** {F13812} The [sqlite3_column_double(S,N)] interface converts the
**          Nth column in the current row of the result set for
**          [prepared statement] S into a floating point value and
**          returns a copy of that value.
**
** {F13815} The [sqlite3_column_int(S,N)] interface converts the
**          Nth column in the current row of the result set for
**          [prepared statement] S into a 32-bit signed integer and
**          returns a copy of that integer.
**
** {F13818} The [sqlite3_column_int64(S,N)] interface converts the
**          Nth column in the current row of the result set for
**          [prepared statement] S into a 64-bit signed integer and
**          returns a copy of that integer.
**
** {F13821} The [sqlite3_column_text(S,N)] interface converts the
**          Nth column in the current row of the result set for
**          [prepared statement] S into a zero-terminated UTF-8 
**          string and returns a pointer to that string.
**
** {F13824} The [sqlite3_column_text16(S,N)] interface converts the
**          Nth column in the current row of the result set for
**          [prepared statement] S into a zero-terminated 2-byte
**          aligned UTF-16 native byte order
**          string and returns a pointer to that string.
**
** {F13827} The [sqlite3_column_type(S,N)] interface returns
**          one of [SQLITE_NULL], [SQLITE_INTEGER], [SQLITE_FLOAT],
**          [SQLITE_TEXT], or [SQLITE_BLOB] as appropriate for
**          the Nth column in the current row of the result set for
**          [prepared statement] S.
**
** {F13830} The [sqlite3_column_value(S,N)] interface returns a
**          pointer to the [sqlite3_value] object that for the
**          Nth column in the current row of the result set for
**          [prepared statement] S.
*/
const void *sqlite3_column_blob(sqlite3_stmt*, int iCol);
int sqlite3_column_bytes(sqlite3_stmt*, int iCol);
int sqlite3_column_bytes16(sqlite3_stmt*, int iCol);
double sqlite3_column_double(sqlite3_stmt*, int iCol);
int sqlite3_column_int(sqlite3_stmt*, int iCol);
sqlite3_int64 sqlite3_column_int64(sqlite3_stmt*, int iCol);
const unsigned char *sqlite3_column_text(sqlite3_stmt*, int iCol);
const void *sqlite3_column_text16(sqlite3_stmt*, int iCol);
int sqlite3_column_type(sqlite3_stmt*, int iCol);
sqlite3_value *sqlite3_column_value(sqlite3_stmt*, int iCol);

/*
** CAPI3REF: Destroy A Prepared Statement Object {F13300}
**
** The sqlite3_finalize() function is called to delete a 
** [prepared statement]. If the statement was
** executed successfully, or not executed at all, then SQLITE_OK is returned.
** If execution of the statement failed then an 
** [error code] or [extended error code]
** is returned. 
**
** This routine can be called at any point during the execution of the
** [prepared statement].  If the virtual machine has not 
** completed execution when this routine is called, that is like
** encountering an error or an interrupt.  (See [sqlite3_interrupt()].) 
** Incomplete updates may be rolled back and transactions cancelled,  
** depending on the circumstances, and the 
** [error code] returned will be [SQLITE_ABORT].
**
** INVARIANTS:
**
** {F11302} The [sqlite3_finalize(S)] interface destroys the
**          [prepared statement] S and releases all
**          memory and file resources held by that object.
**
** {F11304} If the most recent call to [sqlite3_step(S)] for the
**          [prepared statement] S returned an error,
**          then [sqlite3_finalize(S)] returns that same error.
*/
int sqlite3_finalize(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Reset A Prepared Statement Object {F13330}
**
** The sqlite3_reset() function is called to reset a 
** [prepared statement] object.
** back to its initial state, ready to be re-executed.
** Any SQL statement variables that had values bound to them using
** the [sqlite3_bind_blob | sqlite3_bind_*() API] retain their values.
** Use [sqlite3_clear_bindings()] to reset the bindings.
**
** {F11332} The [sqlite3_reset(S)] interface resets the [prepared statement] S
**          back to the beginning of its program.
**
** {F11334} If the most recent call to [sqlite3_step(S)] for 
**          [prepared statement] S returned [SQLITE_ROW] or [SQLITE_DONE],
**          or if [sqlite3_step(S)] has never before been called on S,
**          then [sqlite3_reset(S)] returns [SQLITE_OK].
**
** {F11336} If the most recent call to [sqlite3_step(S)] for
**          [prepared statement] S indicated an error, then
**          [sqlite3_reset(S)] returns an appropriate [error code].
**
** {F11338} The [sqlite3_reset(S)] interface does not change the values
**          of any [sqlite3_bind_blob|bindings] on [prepared statement] S.
*/
int sqlite3_reset(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Create Or Redefine SQL Functions {F16100}
** KEYWORDS: {function creation routines} 
**
** These two functions (collectively known as
** "function creation routines") are used to add SQL functions or aggregates
** or to redefine the behavior of existing SQL functions or aggregates.  The
** difference only between the two is that the second parameter, the
** name of the (scalar) function or aggregate, is encoded in UTF-8 for
** sqlite3_create_function() and UTF-16 for sqlite3_create_function16().
**
** The first argument is the [database connection] that holds the
** SQL function or aggregate is to be added or redefined. If a single
** program uses more than one database handle internally, then SQL
** functions or aggregates must be added individually to each database
** handle with which they will be used.
**
** The second parameter is the name of the SQL function to be created
** or redefined.
................................................................................
** aggregate may take any number of arguments.
**
** The fourth parameter, eTextRep, specifies what 
** [SQLITE_UTF8 | text encoding] this SQL function prefers for
** its parameters.  Any SQL function implementation should be able to work
** work with UTF-8, UTF-16le, or UTF-16be.  But some implementations may be
** more efficient with one encoding than another.  It is allowed to
** invoke sqlite3_create_function() or sqlite3_create_function16() multiple
** times with the same function but with different values of eTextRep.
** When multiple implementations of the same function are available, SQLite
** will pick the one that involves the least amount of data conversion.
** If there is only a single implementation which does not care what
** text encoding is used, then the fourth argument should be
** [SQLITE_ANY].
**
** The fifth parameter is an arbitrary pointer.  The implementation
** of the function can gain access to this pointer using
** [sqlite3_user_data()].
**
** The seventh, eighth and ninth parameters, xFunc, xStep and xFinal, are
** pointers to C-language functions that implement the SQL
** function or aggregate. A scalar SQL function requires an implementation of
** the xFunc callback only, NULL pointers should be passed as the xStep
** and xFinal parameters. An aggregate SQL function requires an implementation
** of xStep and xFinal and NULL should be passed for xFunc. To delete an
................................................................................
** callback.
**
** It is permitted to register multiple implementations of the same
** functions with the same name but with either differing numbers of
** arguments or differing perferred text encodings.  SQLite will use
** the implementation most closely matches the way in which the
** SQL function is used.
**
** INVARIANTS:
**
** {F16103} The [sqlite3_create_function16()] interface behaves exactly
**          like [sqlite3_create_function()] in every way except that it
**          interprets the zFunctionName argument as
**          zero-terminated UTF-16 native byte order instead of as a
**          zero-terminated UTF-8.
**
** {F16106} 
*/
int sqlite3_create_function(
  sqlite3 *db,
  const char *zFunctionName,
  int nArg,
  int eTextRep,
  void *pApp,
  void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
  void (*xFinal)(sqlite3_context*)
);
int sqlite3_create_function16(
  sqlite3 *db,
  const void *zFunctionName,
  int nArg,
  int eTextRep,
  void *pApp,
  void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
  void (*xFinal)(sqlite3_context*)
);

/*
** CAPI3REF: Text Encodings {F10267}
**
** These constant define integer codes that represent the various
** text encodings supported by SQLite.
*/
#define SQLITE_UTF8           1
#define SQLITE_UTF16LE        2
#define SQLITE_UTF16BE        3
................................................................................
** the use of these functions.  To help encourage people to avoid
** using these functions, we are not going to tell you want they do.
*/
int sqlite3_aggregate_count(sqlite3_context*);
int sqlite3_expired(sqlite3_stmt*);
int sqlite3_transfer_bindings(sqlite3_stmt*, sqlite3_stmt*);
int sqlite3_global_recover(void);
void sqlite3_thread_cleanup(void);
int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),void*,sqlite3_int64);


/*
** CAPI3REF: Obtaining SQL Function Parameter Values {F15100}
**
** The C-language implementation of SQL functions and aggregates uses
** this set of interface routines to access the parameter values on
** the function or aggregate.
**
** The xFunc (for scalar functions) or xStep (for aggregates) parameters
** to [sqlite3_create_function()] and [sqlite3_create_function16()]
................................................................................
** in the native byte-order of the host machine.  The
** sqlite3_value_text16be() and sqlite3_value_text16le() interfaces
** extract UTF16 strings as big-endian and little-endian respectively.
**
** The sqlite3_value_numeric_type() interface attempts to apply
** numeric affinity to the value.  This means that an attempt is
** made to convert the value to an integer or floating point.  If
** such a conversion is possible without loss of information (in other
** words if the value is a string that looks like a number)
** then the conversion is done.  Otherwise no conversion occurs.  The 
** [SQLITE_INTEGER | datatype] after conversion is returned.
**
** Please pay particular attention to the fact that the pointer that
** is returned from [sqlite3_value_blob()], [sqlite3_value_text()], or
** [sqlite3_value_text16()] can be invalidated by a subsequent call to
** [sqlite3_value_bytes()], [sqlite3_value_bytes16()], [sqlite3_value_text()],
** or [sqlite3_value_text16()].  
**
** These routines must be called from the same thread as
** the SQL function that supplied the sqlite3_value* parameters.
** Or, if the sqlite3_value* argument comes from the [sqlite3_column_value()]
** interface, then these routines should be called from the same thread
** that ran [sqlite3_column_value()].
**
*/
const void *sqlite3_value_blob(sqlite3_value*);
int sqlite3_value_bytes(sqlite3_value*);
int sqlite3_value_bytes16(sqlite3_value*);
double sqlite3_value_double(sqlite3_value*);
int sqlite3_value_int(sqlite3_value*);
sqlite3_int64 sqlite3_value_int64(sqlite3_value*);
const unsigned char *sqlite3_value_text(sqlite3_value*);
const void *sqlite3_value_text16(sqlite3_value*);
const void *sqlite3_value_text16le(sqlite3_value*);
const void *sqlite3_value_text16be(sqlite3_value*);
int sqlite3_value_type(sqlite3_value*);
int sqlite3_value_numeric_type(sqlite3_value*);

/*
** CAPI3REF: Obtain Aggregate Function Context {F16210}
**
** The implementation of aggregate SQL functions use this routine to allocate
** a structure for storing their state.  
** {F16211} The first time the sqlite3_aggregate_context() routine is
** is called for a particular aggregate, SQLite allocates nBytes of memory

** zeros that memory, and returns a pointer to it.
** {F16212} On second and subsequent calls to sqlite3_aggregate_context()
** for the same aggregate function index, the same buffer is returned. {END}
** The implementation
** of the aggregate can use the returned buffer to accumulate data.
**

** {F16213} SQLite automatically frees the allocated buffer when the aggregate
** query concludes. {END}
**
** The first parameter should be a copy of the 
** [sqlite3_context | SQL function context] that is the first
** parameter to the callback routine that implements the aggregate
** function.
**
** This routine must be called from the same thread in which
** the aggregate SQL function is running.
*/
void *sqlite3_aggregate_context(sqlite3_context*, int nBytes);

/*
** CAPI3REF: User Data For Functions {F16240}
**
** {F16241} The sqlite3_user_data() interface returns a copy of
** the pointer that was the pUserData parameter (the 5th parameter)
** of the the [sqlite3_create_function()]
** and [sqlite3_create_function16()] routines that originally


** registered the application defined function. {END}
**
** {U16243} This routine must be called from the same thread in which
** the application-defined function is running.
*/
void *sqlite3_user_data(sqlite3_context*);

/*
** CAPI3REF: Function Auxiliary Data {F16270}
**
** The following two functions may be used by scalar SQL functions to
** associate meta-data with argument values. If the same value is passed to
** multiple invocations of the same SQL function during query execution, under
** some circumstances the associated meta-data may be preserved. This may
** be used, for example, to add a regular-expression matching scalar
** function. The compiled version of the regular expression is stored as
** meta-data associated with the SQL value passed as the regular expression
** pattern.  The compiled regular expression can be reused on multiple
** invocations of the same function so that the original pattern string
** does not need to be recompiled on each invocation.
**
** {F16271}
** The sqlite3_get_auxdata() interface returns a pointer to the meta-data
** associated by the sqlite3_set_auxdata() function with the Nth argument
** value to the application-defined function.
** {F16272} If no meta-data has been ever been set for the Nth
** argument of the function, or if the cooresponding function parameter
** has changed since the meta-data was set, then sqlite3_get_auxdata()
** returns a NULL pointer.
**
** {F16275} The sqlite3_set_auxdata() interface saves the meta-data
** pointed to by its 3rd parameter as the meta-data for the N-th
** argument of the application-defined function. {END} Subsequent
** calls to sqlite3_get_auxdata() might return this data, if it has
** not been destroyed. 
** {F16277} If it is not NULL, SQLite will invoke the destructor 
** function given by the 4th parameter to sqlite3_set_auxdata() on
** the meta-data when the corresponding function parameter changes
** or when the SQL statement completes, whichever comes first. {END}
**
** In practice, meta-data is preserved between function calls for
** expressions that are constant at compile time. This includes literal
** values and SQL variables.
**
** These routines must be called from the same thread in which
** the SQL function is running.
*/
void *sqlite3_get_auxdata(sqlite3_context*, int N);
void sqlite3_set_auxdata(sqlite3_context*, int N, void*, void (*)(void*));


/*
** CAPI3REF: Constants Defining Special Destructor Behavior {F10280}
**
** These are special value for the destructor that is passed in as the
** final argument to routines like [sqlite3_result_blob()].  If the destructor
** argument is SQLITE_STATIC, it means that the content pointer is constant
** and will never change.  It does not need to be destroyed.  The 
** SQLITE_TRANSIENT value means that the content will likely change in
** the near future and that SQLite should make its own private copy of
................................................................................
** C++ compilers.  See ticket #2191.
*/
typedef void (*sqlite3_destructor_type)(void*);
#define SQLITE_STATIC      ((sqlite3_destructor_type)0)
#define SQLITE_TRANSIENT   ((sqlite3_destructor_type)-1)

/*
** CAPI3REF: Setting The Result Of An SQL Function {F16400}
**
** These routines are used by the xFunc or xFinal callbacks that
** implement SQL functions and aggregates.  See
** [sqlite3_create_function()] and [sqlite3_create_function16()]
** for additional information.
**
** These functions work very much like the 
** [sqlite3_bind_blob | sqlite3_bind_*] family of functions used
** to bind values to host parameters in prepared statements.
** Refer to the
** [sqlite3_bind_blob | sqlite3_bind_* documentation] for
** additional information.
**
** {F16402} The sqlite3_result_blob() interface sets the result from
** an application defined function to be the BLOB whose content is pointed
** to by the second parameter and which is N bytes long where N is the
** third parameter. 
** {F16403} The sqlite3_result_zeroblob() inerfaces set the result of
** the application defined function to be a BLOB containing all zero
** bytes and N bytes in size, where N is the value of the 2nd parameter.
**
** {F16407} The sqlite3_result_double() interface sets the result from
** an application defined function to be a floating point value specified
** by its 2nd argument.
**
** {F16409} The sqlite3_result_error() and sqlite3_result_error16() functions
** cause the implemented SQL function to throw an exception.
** {F16411} SQLite uses the string pointed to by the
** 2nd parameter of sqlite3_result_error() or sqlite3_result_error16()
** as the text of an error message. {F16412} SQLite interprets the error
** message string from sqlite3_result_error() as UTF8.  {F16413} SQLite
** interprets the string from sqlite3_result_error16() as UTF16 in native
** byte order.  {F16414} If the third parameter to sqlite3_result_error()
** or sqlite3_result_error16() is negative then SQLite takes as the error
** message all text up through the first zero character.
** {F16415} If the third parameter to sqlite3_result_error() or
** sqlite3_result_error16() is non-negative then SQLite takes that many
** bytes (not characters) from the 2nd parameter as the error message.
** {F16417} The sqlite3_result_error() and sqlite3_result_error16()
** routines make a copy private copy of the error message text before
** they return.  {END} Hence, the calling function can deallocate or
** modify the text after they return without harm.
**
** {F16421} The sqlite3_result_toobig() interface causes SQLite
** to throw an error indicating that a string or BLOB is to long
** to represent.  {F16422} The sqlite3_result_nomem() interface
** causes SQLite to throw an exception indicating that the a
** memory allocation failed.
**
** {F16431} The sqlite3_result_int() interface sets the return value
** of the application-defined function to be the 32-bit signed integer
** value given in the 2nd argument.
** {F16432} The sqlite3_result_int64() interface sets the return value
** of the application-defined function to be the 64-bit signed integer
** value given in the 2nd argument.
**
** {F16437} The sqlite3_result_null() interface sets the return value
** of the application-defined function to be NULL.
**
** {F16441} The sqlite3_result_text(), sqlite3_result_text16(), 
** sqlite3_result_text16le(), and sqlite3_result_text16be() interfaces
** set the return value of the application-defined function to be
** a text string which is represented as UTF-8, UTF-16 native byte order,
** UTF-16 little endian, or UTF-16 big endian, respectively.
** {F16442} SQLite takes the text result from the application from
** the 2nd parameter of the sqlite3_result_text* interfaces.
** {F16444} If the 3rd parameter to the sqlite3_result_text* interfaces
** is negative, then SQLite takes result text from the 2nd parameter 
** through the first zero character.
** {F16447} If the 3rd parameter to the sqlite3_result_text* interfaces
** is non-negative, then as many bytes (not characters) of the text
** pointed to by the 2nd parameter are taken as the application-defined
** function result.
** {F16451} If the 4th parameter to the sqlite3_result_text* interfaces
** or sqlite3_result_blob is a non-NULL pointer, then SQLite calls that
** function as the destructor on the text or blob result when it has
** finished using that result.
** {F16453} If the 4th parameter to the sqlite3_result_text* interfaces
** or sqlite3_result_blob is the special constant SQLITE_STATIC, then
** SQLite assumes that the text or blob result is constant space and
** does not copy the space or call a destructor when it has
** finished using that result.
** {F16454} If the 4th parameter to the sqlite3_result_text* interfaces
** or sqlite3_result_blob is the special constant SQLITE_TRANSIENT
** then SQLite makes a copy of the result into space obtained from
** from [sqlite3_malloc()] before it returns.
**
** {F16461} The sqlite3_result_value() interface sets the result of
** the application-defined function to be a copy the [sqlite3_value]
** object specified by the 2nd parameter.  {F16463} The
** sqlite3_result_value() interface makes a copy of the [sqlite3_value]
** so that [sqlite3_value] specified in the parameter may change or
** be deallocated after sqlite3_result_value() returns without harm.
**
** {U16491} These routines are called from within the different thread 
** than the one containing the application-defined function that recieved
** the [sqlite3_context] pointer, the results are undefined.
*/
void sqlite3_result_blob(sqlite3_context*, const void*, int, void(*)(void*));
void sqlite3_result_double(sqlite3_context*, double);
void sqlite3_result_error(sqlite3_context*, const char*, int);
void sqlite3_result_error16(sqlite3_context*, const void*, int);
void sqlite3_result_error_toobig(sqlite3_context*);
void sqlite3_result_error_nomem(sqlite3_context*);
void sqlite3_result_int(sqlite3_context*, int);
void sqlite3_result_int64(sqlite3_context*, sqlite3_int64);
void sqlite3_result_null(sqlite3_context*);
void sqlite3_result_text(sqlite3_context*, const char*, int, void(*)(void*));
void sqlite3_result_text16(sqlite3_context*, const void*, int, void(*)(void*));
void sqlite3_result_text16le(sqlite3_context*, const void*, int,void(*)(void*));
void sqlite3_result_text16be(sqlite3_context*, const void*, int,void(*)(void*));
void sqlite3_result_value(sqlite3_context*, sqlite3_value*);
void sqlite3_result_zeroblob(sqlite3_context*, int n);

/*
** CAPI3REF: Define New Collating Sequences {F16600}
**
** {F16601}
** These functions are used to add new collation sequences to the
** [sqlite3*] handle specified as the first argument. 
**
** {F16602}
** The name of the new collation sequence is specified as a UTF-8 string
** for sqlite3_create_collation() and sqlite3_create_collation_v2()
** and a UTF-16 string for sqlite3_create_collation16(). {F16603} In all cases
** the name is passed as the second function argument.
**
** {F16604}
** The third argument may be one of the constants [SQLITE_UTF8],
** [SQLITE_UTF16LE] or [SQLITE_UTF16BE], indicating that the user-supplied
** routine expects to be passed pointers to strings encoded using UTF-8,
** UTF-16 little-endian or UTF-16 big-endian respectively. {F16605} The
** third argument might also be [SQLITE_UTF16_ALIGNED] to indicate that
** the routine expects pointers to 16-bit word aligned strings
** of UTF16 in the native byte order of the host computer.
**
** {F16607}
** A pointer to the user supplied routine must be passed as the fifth
** argument. {F16609} If it is NULL, this is the same as deleting the collation
** sequence (so that SQLite cannot call it anymore).
** {F16611} Each time the application
** supplied function is invoked, it is passed a copy of the void* passed as
** the fourth argument to sqlite3_create_collation() or
** sqlite3_create_collation16() as its first parameter.
**
** {F16612}
** The remaining arguments to the application-supplied routine are two strings,
** each represented by a (length, data) pair and encoded in the encoding
** that was passed as the third argument when the collation sequence was
** registered. {END} The application defined collation routine should
** return negative, zero or positive if
** the first string is less than, equal to, or greater than the second
** string. i.e. (STRING1 - STRING2).
**
** {F16615}
** The sqlite3_create_collation_v2() works like sqlite3_create_collation()
** excapt that it takes an extra argument which is a destructor for
** the collation.  {F16617} The destructor is called when the collation is
** destroyed and is passed a copy of the fourth parameter void* pointer
** of the sqlite3_create_collation_v2().
** {F16618}  Collations are destroyed when
** they are overridden by later calls to the collation creation functions
** or when the [sqlite3*] database handle is closed using [sqlite3_close()].




*/
int sqlite3_create_collation(
  sqlite3*, 
  const char *zName, 
  int eTextRep, 
  void*,
  int(*xCompare)(void*,int,const void*,int,const void*)
................................................................................
  const char *zName, 
  int eTextRep, 
  void*,
  int(*xCompare)(void*,int,const void*,int,const void*)
);

/*
** CAPI3REF: Collation Needed Callbacks {F16700}
**
** {F16701}
** To avoid having to register all collation sequences before a database
** can be used, a single callback function may be registered with the
** database handle to be called whenever an undefined collation sequence is
** required.
**
** {F16702}
** If the function is registered using the sqlite3_collation_needed() API,
** then it is passed the names of undefined collation sequences as strings
** encoded in UTF-8. {F16703} If sqlite3_collation_needed16() is used, the names
** are passed as UTF-16 in machine native byte order. {F16704} A call to either
** function replaces any existing callback.
**
** {F16705} When the callback is invoked, the first argument passed is a copy
** of the second argument to sqlite3_collation_needed() or
** sqlite3_collation_needed16(). {F16706} The second argument is the database
** handle.  {F16707} The third argument is one of [SQLITE_UTF8],
** [SQLITE_UTF16BE], or [SQLITE_UTF16LE], indicating the most
** desirable form of the collation sequence function required.
** {F16708} The fourth parameter is the name of the
** required collation sequence. {END}
**
** The callback function should register the desired collation using
** [sqlite3_create_collation()], [sqlite3_create_collation16()], or
** [sqlite3_create_collation_v2()].
*/
int sqlite3_collation_needed(
  sqlite3*, 
................................................................................
*/
int sqlite3_rekey(
  sqlite3 *db,                   /* Database to be rekeyed */
  const void *pKey, int nKey     /* The new key */
);

/*
** CAPI3REF:  Suspend Execution For A Short Time {F10530}
**
** {F10531} The sqlite3_sleep() function
** causes the current thread to suspend execution
** for at least a number of milliseconds specified in its parameter.
**
** {F10532} If the operating system does not support sleep requests with 
** millisecond time resolution, then the time will be rounded up to 
** the nearest second. {F10533} The number of milliseconds of sleep actually 
** requested from the operating system is returned.
**
** {F10534} SQLite implements this interface by calling the xSleep()
** method of the default [sqlite3_vfs] object. {END}
*/
int sqlite3_sleep(int);

/*
** CAPI3REF:  Name Of The Folder Holding Temporary Files {F10310}
**
** If this global variable is made to point to a string which is
** the name of a folder (a.ka. directory), then all temporary files
** created by SQLite will be placed in that directory.  If this variable
** is NULL pointer, then SQLite does a search for an appropriate temporary
** file directory.
**
** It is not safe to modify this variable once a database connection
** has been opened.  It is intended that this variable be set once
** as part of process initialization and before any SQLite interface
** routines have been call and remain unchanged thereafter.
*/
SQLITE_EXTERN char *sqlite3_temp_directory;

/*
** CAPI3REF:  Test To See If The Database Is In Auto-Commit Mode {F12930}
**
** The sqlite3_get_autocommit() interfaces returns non-zero or
** zero if the given database connection is or is not in autocommit mode,
** respectively.   Autocommit mode is on
** by default.  Autocommit mode is disabled by a [BEGIN] statement.

** Autocommit mode is reenabled by a [COMMIT] or [ROLLBACK].
**
** If certain kinds of errors occur on a statement within a multi-statement
** transactions (errors including [SQLITE_FULL], [SQLITE_IOERR], 
** [SQLITE_NOMEM], [SQLITE_BUSY], and [SQLITE_INTERRUPT]) then the
** transaction might be rolled back automatically.  The only way to
** find out if SQLite automatically rolled back the transaction after
** an error is to use this function.
**
** INVARIANTS:
**
** {F12931} The [sqlite3_get_autocommit()] interface returns non-zero or
**          zero if the given database connection is or is not in autocommit
**          mode, respectively.
**
** {F12932} Autocommit mode is on by default.
**
** {F12933} Autocommit mode is disabled by a successful [BEGIN] statement.
**
** {F12934} Autocommit mode is enabled by a successful [COMMIT] or [ROLLBACK]
**          statement.
** 
**
** LIMITATIONS:
***
** {U12936} If another thread changes the autocommit status of the database
**          connection while this routine is running, then the return value
**          is undefined.
*/
int sqlite3_get_autocommit(sqlite3*);

/*
** CAPI3REF:  Find The Database Handle Of A Prepared Statement {F13120}
**
** {F13121} The sqlite3_db_handle interface
** returns the [sqlite3*] database handle to which a
** [prepared statement] belongs.
** {F13122} the database handle returned by sqlite3_db_handle
** is the same database handle that was
** the first argument to the [sqlite3_prepare_v2()] or its variants
** that was used to create the statement in the first place.
*/
sqlite3 *sqlite3_db_handle(sqlite3_stmt*);


/*
** CAPI3REF: Commit And Rollback Notification Callbacks {F12950}
**
** {F12951} The sqlite3_commit_hook() interface registers a callback
** function to be invoked whenever a transaction is committed.
** {F12952} Any callback set by a previous call to sqlite3_commit_hook()
** for the same database connection is overridden.
** {F12953} The sqlite3_rollback_hook() interface registers a callback
** function to be invoked whenever a transaction is committed.
** {F12954} Any callback set by a previous call to sqlite3_commit_hook()
** for the same database connection is overridden.
** {F12956} The pArg argument is passed through
** to the callback.  {F12957} If the callback on a commit hook function 
** returns non-zero, then the commit is converted into a rollback.
**
** {F12958} If another function was previously registered, its
** pArg value is returned.  Otherwise NULL is returned.
**
** {F12959} Registering a NULL function disables the callback.
**
** {F12961} For the purposes of this API, a transaction is said to have been 
** rolled back if an explicit "ROLLBACK" statement is executed, or
** an error or constraint causes an implicit rollback to occur.
** {F12962} The rollback callback is not invoked if a transaction is
** automatically rolled back because the database connection is closed.
** {F12964} The rollback callback is not invoked if a transaction is
** rolled back because a commit callback returned non-zero.
** <todo> Check on this </todo> {END}
**
** These are experimental interfaces and are subject to change.
*/
void *sqlite3_commit_hook(sqlite3*, int(*)(void*), void*);
void *sqlite3_rollback_hook(sqlite3*, void(*)(void *), void*);

/*
** CAPI3REF: Data Change Notification Callbacks {F12970}
**
** {F12971} The sqlite3_update_hook() interface
** registers a callback function with the database connection identified by the 
** first argument to be invoked whenever a row is updated, inserted or deleted.
** {F12972} Any callback set by a previous call to this function for the same 
** database connection is overridden.
**
** {F12974} The second argument is a pointer to the function to invoke when a 
** row is updated, inserted or deleted. 
** {F12976} The first argument to the callback is
** a copy of the third argument to sqlite3_update_hook().

** {F12977} The second callback 
** argument is one of [SQLITE_INSERT], [SQLITE_DELETE] or [SQLITE_UPDATE],
** depending on the operation that caused the callback to be invoked.
** {F12978} The third and 
** fourth arguments to the callback contain pointers to the database and 
** table name containing the affected row.
** {F12979} The final callback parameter is 
** the rowid of the row.
** {F12981} In the case of an update, this is the rowid after 
** the update takes place.
**
** {F12983} The update hook is not invoked when internal system tables are
** modified (i.e. sqlite_master and sqlite_sequence).
**
** {F12984} If another function was previously registered, its pArg value
** is returned.  {F12985} Otherwise NULL is returned.
*/
void *sqlite3_update_hook(
  sqlite3*, 
  void(*)(void *,int ,char const *,char const *,sqlite3_int64),
  void*
);

/*
** CAPI3REF:  Enable Or Disable Shared Pager Cache {F10330}
**
** {F10331}
** This routine enables or disables the sharing of the database cache
** and schema data structures between connections to the same database.
** {F10332}
** Sharing is enabled if the argument is true and disabled if the argument
** is false.
**
** {F10333} Cache sharing is enabled and disabled


** for an entire process. {END} This is a change as of SQLite version 3.5.0.
** In prior versions of SQLite, sharing was
** enabled or disabled for each thread separately.
**

** {F10334}
** The cache sharing mode set by this interface effects all subsequent
** calls to [sqlite3_open()], [sqlite3_open_v2()], and [sqlite3_open16()].
** {F10335} Existing database connections continue use the sharing mode
** that was in effect at the time they were opened. {END}


**








** Virtual tables cannot be used with a shared cache.  {F10336} When shared

** cache is enabled, the [sqlite3_create_module()] API used to register
** virtual tables will always return an error. {END}
**
** {F10337} This routine returns [SQLITE_OK] if shared cache was
** enabled or disabled successfully.  {F10338} An [error code]
** is returned otherwise. {END}
**
** {F10339} Shared cache is disabled by default. {END} But this might change in
** future releases of SQLite.  Applications that care about shared
** cache setting should set it explicitly.
*/
int sqlite3_enable_shared_cache(int);

/*
** CAPI3REF:  Attempt To Free Heap Memory {F17340}
**
** {F17341} The sqlite3_release_memory() interface attempts to
** free N bytes of heap memory by deallocating non-essential memory
** allocations held by the database labrary. {END}  Memory used
** to cache database pages to improve performance is an example of



** non-essential memory.  {F16342} sqlite3_release_memory() returns
** the number of bytes actually freed, which might be more or less
** than the amount requested.
*/
int sqlite3_release_memory(int);

/*
** CAPI3REF:  Impose A Limit On Heap Size {F17350}
**
** {F16351} The sqlite3_soft_heap_limit() interface
** places a "soft" limit on the amount of heap memory that may be allocated
** by SQLite. {F16352} If an internal allocation is requested 
** that would exceed the soft heap limit, [sqlite3_release_memory()] is
** invoked one or more times to free up some space before the allocation
** is made. {END}
**
** {F16353} The limit is called "soft", because if
** [sqlite3_release_memory()] cannot
** free sufficient memory to prevent the limit from being exceeded,
** the memory is allocated anyway and the current operation proceeds.
**



** {F16354}
** A negative or zero value for N means that there is no soft heap limit and
** [sqlite3_release_memory()] will only be called when memory is exhausted.
** {F16355} The default value for the soft heap limit is zero.
**
** SQLite makes a best effort to honor the soft heap limit.  
** {F16356} But if the soft heap limit cannot honored, execution will
** continue without error or notification. {END}  This is why the limit is 
** called a "soft" limit.  It is advisory only.
**
** Prior to SQLite version 3.5.0, this routine only constrained the memory
** allocated by a single thread - the same thread in which this routine
** runs.  Beginning with SQLite version 3.5.0, the soft heap limit is
** applied to all threads. {F16357} The value specified for the soft heap limit
** is an upper bound on the total memory allocation for all threads. {END}  In
** version 3.5.0 there is no mechanism for limiting the heap usage for
** individual threads.
*/
void sqlite3_soft_heap_limit(int);

/*















** CAPI3REF:  Extract Metadata About A Column Of A Table {F12850}
**
** This routine
** returns meta-data about a specific column of a specific database
** table accessible using the connection handle passed as the first function 
** argument.
**
** The column is identified by the second, third and fourth parameters to 
................................................................................
  const char *zDbName,        /* Database name or NULL */
  const char *zTableName,     /* Table name */
  const char *zColumnName,    /* Column name */
  char const **pzDataType,    /* OUTPUT: Declared data type */
  char const **pzCollSeq,     /* OUTPUT: Collation sequence name */
  int *pNotNull,              /* OUTPUT: True if NOT NULL constraint exists */
  int *pPrimaryKey,           /* OUTPUT: True if column part of PK */
  int *pAutoinc               /* OUTPUT: True if column is auto-increment */
);

/*
** CAPI3REF: Load An Extension {F12600}
**
** {F12601} The sqlite3_load_extension() interface
** attempts to load an SQLite extension library contained in the file
** zFile. {F12602} The entry point is zProc. {F12603} zProc may be 0
** in which case the name of the entry point defaults
** to "sqlite3_extension_init".
**
** {F12604} The sqlite3_load_extension() interface shall
** return [SQLITE_OK] on success and [SQLITE_ERROR] if something goes wrong.
**
** {F12605}
** If an error occurs and pzErrMsg is not 0, then the
** sqlite3_load_extension() interface shall attempt to fill *pzErrMsg with 
** error message text stored in memory obtained from [sqlite3_malloc()].
** {END}  The calling function should free this memory
** by calling [sqlite3_free()].
**
** {F12606}
** Extension loading must be enabled using [sqlite3_enable_load_extension()]
** prior to calling this API or an error will be returned.
*/
int sqlite3_load_extension(
  sqlite3 *db,          /* Load the extension into this database connection */
  const char *zFile,    /* Name of the shared library containing extension */
  const char *zProc,    /* Entry point.  Derived from zFile if 0 */
  char **pzErrMsg       /* Put error message here if not 0 */
);

/*
** CAPI3REF:  Enable Or Disable Extension Loading {F12620}
**
** So as not to open security holes in older applications that are
** unprepared to deal with extension loading, and as a means of disabling
** extension loading while evaluating user-entered SQL, the following
** API is provided to turn the [sqlite3_load_extension()] mechanism on and
** off.  {F12622} It is off by default. {END} See ticket #1863.
**
** {F12621} Call the sqlite3_enable_load_extension() routine
** with onoff==1 to turn extension loading on
** and call it with onoff==0 to turn it back off again. {END}
*/
int sqlite3_enable_load_extension(sqlite3 *db, int onoff);

/*
** CAPI3REF: Make Arrangements To Automatically Load An Extension {F12640}
**
** {F12641} This function
** registers an extension entry point that is automatically invoked
** whenever a new database connection is opened using

** [sqlite3_open()], [sqlite3_open16()], or [sqlite3_open_v2()]. {END}
**
** This API can be invoked at program startup in order to register
** one or more statically linked extensions that will be available
** to all new database connections.
**
** {F12642} Duplicate extensions are detected so calling this routine multiple
** times with the same extension is harmless.
**
** {F12643} This routine stores a pointer to the extension in an array
** that is obtained from sqlite_malloc(). {END} If you run a memory leak
** checker on your program and it reports a leak because of this
** array, then invoke [sqlite3_reset_auto_extension()] prior
** to shutdown to free the memory.
**
** {F12644} Automatic extensions apply across all threads. {END}
**
** This interface is experimental and is subject to change or
** removal in future releases of SQLite.
*/
int sqlite3_auto_extension(void *xEntryPoint);


/*
** CAPI3REF: Reset Automatic Extension Loading {F12660}
**
** {F12661} This function disables all previously registered
** automatic extensions. {END}  This
** routine undoes the effect of all prior [sqlite3_auto_extension()]
** calls.
**
** {F12662} This call disabled automatic extensions in all threads. {END}
**
** This interface is experimental and is subject to change or
** removal in future releases of SQLite.
*/
void sqlite3_reset_auto_extension(void);


................................................................................
  int (*xOpen)(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor);
  int (*xClose)(sqlite3_vtab_cursor*);
  int (*xFilter)(sqlite3_vtab_cursor*, int idxNum, const char *idxStr,
                int argc, sqlite3_value **argv);
  int (*xNext)(sqlite3_vtab_cursor*);
  int (*xEof)(sqlite3_vtab_cursor*);
  int (*xColumn)(sqlite3_vtab_cursor*, sqlite3_context*, int);
  int (*xRowid)(sqlite3_vtab_cursor*, sqlite3_int64 *pRowid);
  int (*xUpdate)(sqlite3_vtab *, int, sqlite3_value **, sqlite3_int64 *);
  int (*xBegin)(sqlite3_vtab *pVTab);
  int (*xSync)(sqlite3_vtab *pVTab);
  int (*xCommit)(sqlite3_vtab *pVTab);
  int (*xRollback)(sqlite3_vtab *pVTab);
  int (*xFindFunction)(sqlite3_vtab *pVtab, int nArg, const char *zName,
                       void (**pxFunc)(sqlite3_context*,int,sqlite3_value**),
                       void **ppArg);
................................................................................
** results into the **Outputs** fields.
**
** The aConstraint[] array records WHERE clause constraints of the
** form:
**
**         column OP expr
**
** Where OP is =, &lt;, &lt;=, &gt;, or &gt;=.  
** The particular operator is stored
** in aConstraint[].op.  The index of the column is stored in 
** aConstraint[].iColumn.  aConstraint[].usable is TRUE if the
** expr on the right-hand side can be evaluated (and thus the constraint
** is usable) and false if it cannot.
**
** The optimizer automatically inverts terms of the form "expr OP column"
** and makes other simplifications to the WHERE clause in an attempt to
** get as many WHERE clause terms into the form shown above as possible.
** The aConstraint[] array only reports WHERE clause terms in the correct
** form that refer to the particular virtual table being queried.
**
** Information about the ORDER BY clause is stored in aOrderBy[].
** Each term of aOrderBy records a column of the ORDER BY clause.
**
................................................................................
** The estimatedCost value is an estimate of the cost of doing the
** particular lookup.  A full scan of a table with N entries should have
** a cost of N.  A binary search of a table of N entries should have a
** cost of approximately log(N).
*/
struct sqlite3_index_info {
  /* Inputs */
  int nConstraint;           /* Number of entries in aConstraint */
  struct sqlite3_index_constraint {
     int iColumn;              /* Column on left-hand side of constraint */
     unsigned char op;         /* Constraint operator */
     unsigned char usable;     /* True if this constraint is usable */
     int iTermOffset;          /* Used internally - xBestIndex should ignore */
  } *aConstraint;            /* Table of WHERE clause constraints */
  int nOrderBy;              /* Number of terms in the ORDER BY clause */
  struct sqlite3_index_orderby {
     int iColumn;              /* Column number */
     unsigned char desc;       /* True for DESC.  False for ASC. */
  } *aOrderBy;               /* The ORDER BY clause */

  /* Outputs */
  struct sqlite3_index_constraint_usage {
    int argvIndex;           /* if >0, constraint is part of argv to xFilter */
    unsigned char omit;      /* Do not code a test for this constraint */
  } *aConstraintUsage;
  int idxNum;                /* Number used to identify the index */
  char *idxStr;              /* String, possibly obtained from sqlite3_malloc */
  int needToFreeIdxStr;      /* Free idxStr using sqlite3_free() if true */
  int orderByConsumed;       /* True if output is already ordered */
  double estimatedCost;      /* Estimated cost of using this index */
};
#define SQLITE_INDEX_CONSTRAINT_EQ    2
................................................................................
  void *,                    /* Client data for xCreate/xConnect */
  void(*xDestroy)(void*)     /* Module destructor function */
);

/*
** Every module implementation uses a subclass of the following structure
** to describe a particular instance of the module.  Each subclass will
** be tailored to the specific needs of the module implementation.   The
** purpose of this superclass is to define certain fields that are common
** to all module implementations.
**
** Virtual tables methods can set an error message by assigning a
** string obtained from sqlite3_mprintf() to zErrMsg.  The method should
** take care that any prior string is freed by a call to sqlite3_free()
** prior to assigning a new string to zErrMsg.  After the error message
................................................................................

/*
** The interface to the virtual-table mechanism defined above (back up
** to a comment remarkably similar to this one) is currently considered
** to be experimental.  The interface might change in incompatible ways.
** If this is a problem for you, do not use the interface at this time.
**
** When the virtual-table mechanism stabilizes, we will declare the
** interface fixed, support it indefinitely, and remove this comment.
**
****** EXPERIMENTAL - subject to change without notice **************
*/

/*
** CAPI3REF: A Handle To An Open BLOB {F17800}
**
** An instance of the following opaque structure is used to 
** represent an blob-handle.  A blob-handle is created by
** [sqlite3_blob_open()] and destroyed by [sqlite3_blob_close()].
** The [sqlite3_blob_read()] and [sqlite3_blob_write()] interfaces
** can be used to read or write small subsections of the blob.
** The [sqlite3_blob_bytes()] interface returns the size of the
** blob in bytes.
*/
typedef struct sqlite3_blob sqlite3_blob;

/*
** CAPI3REF: Open A BLOB For Incremental I/O {F17810}
**
** {F17811} This interfaces opens a handle to the blob located
** in row iRow,, column zColumn, table zTable in database zDb;
** in other words,  the same blob that would be selected by:
**
** <pre>
**     SELECT zColumn FROM zDb.zTable WHERE rowid = iRow;
** </pre> {END}
**
** {F17812} If the flags parameter is non-zero, the blob is opened for 
** read and write access. If it is zero, the blob is opened for read 
** access. {END}
**
** {F17813} On success, [SQLITE_OK] is returned and the new 
** [sqlite3_blob | blob handle] is written to *ppBlob. 
** {F17814} Otherwise an error code is returned and 
** any value written to *ppBlob should not be used by the caller.
** {F17815} This function sets the database-handle error code and message
** accessible via [sqlite3_errcode()] and [sqlite3_errmsg()].
** <todo>We should go through and mark all interfaces that behave this
** way with a similar statement</todo>
*/
int sqlite3_blob_open(
  sqlite3*,
  const char *zDb,
  const char *zTable,
  const char *zColumn,
  sqlite3_int64 iRow,
  int flags,
  sqlite3_blob **ppBlob
);

/*
** CAPI3REF:  Close A BLOB Handle {F17830}
**
** Close an open [sqlite3_blob | blob handle].
**
** {F17831} Closing a BLOB shall cause the current transaction to commit
** if there are no other BLOBs, no pending prepared statements, and the
** database connection is in autocommit mode.
** {F17832} If any writes were made to the BLOB, they might be held in cache
** until the close operation if they will fit. {END}
** Closing the BLOB often forces the changes
** out to disk and so if any I/O errors occur, they will likely occur
** at the time when the BLOB is closed.  {F17833} Any errors that occur during
** closing are reported as a non-zero return value.
**
** {F17839} The BLOB is closed unconditionally.  Even if this routine returns
** an error code, the BLOB is still closed.
*/
int sqlite3_blob_close(sqlite3_blob *);

/*
** CAPI3REF:  Return The Size Of An Open BLOB {F17805}
**
** {F16806} Return the size in bytes of the blob accessible via the open 
** [sqlite3_blob | blob-handle] passed as an argument.
*/
int sqlite3_blob_bytes(sqlite3_blob *);

/*
** CAPI3REF:  Read Data From A BLOB Incrementally {F17850}
**
** This function is used to read data from an open 
** [sqlite3_blob | blob-handle] into a caller supplied buffer.
** {F17851} n bytes of data are copied into buffer
** z from the open blob, starting at offset iOffset.
**
** {F17852} If offset iOffset is less than n bytes from the end of the blob, 
** [SQLITE_ERROR] is returned and no data is read.  {F17853} If n is
** less than zero [SQLITE_ERROR] is returned and no data is read.
**
** {F17854} On success, SQLITE_OK is returned. Otherwise, an 

** [error code] or an [extended error code] is returned.
*/
int sqlite3_blob_read(sqlite3_blob *, void *z, int n, int iOffset);

/*
** CAPI3REF:  Write Data Into A BLOB Incrementally {F17870}
**
** This function is used to write data into an open 
** [sqlite3_blob | blob-handle] from a user supplied buffer.
** {F17871} n bytes of data are copied from the buffer
** pointed to by z into the open blob, starting at offset iOffset.
**
** {F17872} If the [sqlite3_blob | blob-handle] passed as the first argument
** was not opened for writing (the flags parameter to [sqlite3_blob_open()]
*** was zero), this function returns [SQLITE_READONLY].
**
** {F17873} This function may only modify the contents of the blob; it is
** not possible to increase the size of a blob using this API.
** {F17874} If offset iOffset is less than n bytes from the end of the blob, 
** [SQLITE_ERROR] is returned and no data is written.  {F17875} If n is
** less than zero [SQLITE_ERROR] is returned and no data is written.
**
** {F17876} On success, SQLITE_OK is returned. Otherwise, an 

** [error code] or an [extended error code] is returned.
*/
int sqlite3_blob_write(sqlite3_blob *, const void *z, int n, int iOffset);

/*
** CAPI3REF:  Virtual File System Objects {F11200}
**
** A virtual filesystem (VFS) is an [sqlite3_vfs] object
** that SQLite uses to interact
** with the underlying operating system.  Most builds come with a
** single default VFS that is appropriate for the host computer.
** New VFSes can be registered and existing VFSes can be unregistered.
** The following interfaces are provided.
**
** {F11201} The sqlite3_vfs_find() interface returns a pointer to 
** a VFS given its name.  {F11202} Names are case sensitive.
** {F11203} Names are zero-terminated UTF-8 strings.
** {F11204} If there is no match, a NULL
** pointer is returned. {F11205} If zVfsName is NULL then the default 
** VFS is returned. {END}
**
** {F11210} New VFSes are registered with sqlite3_vfs_register().
** {F11211} Each new VFS becomes the default VFS if the makeDflt flag is set.
** {F11212} The same VFS can be registered multiple times without injury.
** {F11213} To make an existing VFS into the default VFS, register it again
** with the makeDflt flag set. {U11214} If two different VFSes with the
** same name are registered, the behavior is undefined.  {U11215} If a
** VFS is registered with a name that is NULL or an empty string,
** then the behavior is undefined.
** 
** {F11220} Unregister a VFS with the sqlite3_vfs_unregister() interface.
** {F11221} If the default VFS is unregistered, another VFS is chosen as
** the default.  The choice for the new VFS is arbitrary.
*/
sqlite3_vfs *sqlite3_vfs_find(const char *zVfsName);
int sqlite3_vfs_register(sqlite3_vfs*, int makeDflt);
int sqlite3_vfs_unregister(sqlite3_vfs*);

/*
** CAPI3REF: Mutexes {F17000}
**
** The SQLite core uses these routines for thread
** synchronization.  Though they are intended for internal
** use by SQLite, code that links against SQLite is
** permitted to use any of these routines.
**
** The SQLite source code contains multiple implementations 
** of these mutex routines.  An appropriate implementation
** is selected automatically at compile-time.  The following
** implementations are available in the SQLite core:
**
** <ul>
** <li>   SQLITE_MUTEX_OS2
** <li>   SQLITE_MUTEX_PTHREAD
** <li>   SQLITE_MUTEX_W32
** <li>   SQLITE_MUTEX_NOOP
** </ul>
**
** The SQLITE_MUTEX_NOOP implementation is a set of routines 
** that does no real locking and is appropriate for use in 
** a single-threaded application.  The SQLITE_MUTEX_OS2,
** SQLITE_MUTEX_PTHREAD, and SQLITE_MUTEX_W32 implementations
** are appropriate for use on os/2, unix, and windows.
** 
** If SQLite is compiled with the SQLITE_MUTEX_APPDEF preprocessor
** macro defined (with "-DSQLITE_MUTEX_APPDEF=1"), then no mutex
** implementation is included with the library.  The
** mutex interface routines defined here become external
** references in the SQLite library for which implementations
** must be provided by the application.  This facility allows an
** application that links against SQLite to provide its own mutex
** implementation without having to modify the SQLite core.
**
** {F17011} The sqlite3_mutex_alloc() routine allocates a new
** mutex and returns a pointer to it. {F17012} If it returns NULL
** that means that a mutex could not be allocated. {F17013} SQLite
** will unwind its stack and return an error. {F17014} The argument
** to sqlite3_mutex_alloc() is one of these integer constants:
**
** <ul>
** <li>  SQLITE_MUTEX_FAST
** <li>  SQLITE_MUTEX_RECURSIVE
** <li>  SQLITE_MUTEX_STATIC_MASTER
** <li>  SQLITE_MUTEX_STATIC_MEM
** <li>  SQLITE_MUTEX_STATIC_MEM2
** <li>  SQLITE_MUTEX_STATIC_PRNG
** <li>  SQLITE_MUTEX_STATIC_LRU
** </ul> {END}
**
** {F17015} The first two constants cause sqlite3_mutex_alloc() to create
** a new mutex.  The new mutex is recursive when SQLITE_MUTEX_RECURSIVE
** is used but not necessarily so when SQLITE_MUTEX_FAST is used. {END}
** The mutex implementation does not need to make a distinction
** between SQLITE_MUTEX_RECURSIVE and SQLITE_MUTEX_FAST if it does
** not want to.  {F17016} But SQLite will only request a recursive mutex in
** cases where it really needs one.  {END} If a faster non-recursive mutex
** implementation is available on the host platform, the mutex subsystem
** might return such a mutex in response to SQLITE_MUTEX_FAST.
**
** {F17017} The other allowed parameters to sqlite3_mutex_alloc() each return
** a pointer to a static preexisting mutex. {END}  Four static mutexes are
** used by the current version of SQLite.  Future versions of SQLite
** may add additional static mutexes.  Static mutexes are for internal
** use by SQLite only.  Applications that use SQLite mutexes should
** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or
** SQLITE_MUTEX_RECURSIVE.
**
** {F17018} Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST
** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc()
** returns a different mutex on every call.  {F17034} But for the static 
** mutex types, the same mutex is returned on every call that has
** the same type number. {END}
**
** {F17019} The sqlite3_mutex_free() routine deallocates a previously
** allocated dynamic mutex. {F17020} SQLite is careful to deallocate every
** dynamic mutex that it allocates. {U17021} The dynamic mutexes must not be in 
** use when they are deallocated. {U17022} Attempting to deallocate a static
** mutex results in undefined behavior. {F17023} SQLite never deallocates
** a static mutex. {END}
**
** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
** to enter a mutex. {F17024} If another thread is already within the mutex,
** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return
** SQLITE_BUSY. {F17025}  The sqlite3_mutex_try() interface returns SQLITE_OK
** upon successful entry.  {F17026} Mutexes created using
** SQLITE_MUTEX_RECURSIVE can be entered multiple times by the same thread.
** {F17027} In such cases the,
** mutex must be exited an equal number of times before another thread
** can enter.  {U17028} If the same thread tries to enter any other
** kind of mutex more than once, the behavior is undefined.
** {F17029} SQLite will never exhibit
** such behavior in its own use of mutexes. {END}
**
** Some systems (ex: windows95) do not the operation implemented by
** sqlite3_mutex_try().  On those systems, sqlite3_mutex_try() will
** always return SQLITE_BUSY.  {F17030} The SQLite core only ever uses
** sqlite3_mutex_try() as an optimization so this is acceptable behavior. {END}
**
** {F17031} The sqlite3_mutex_leave() routine exits a mutex that was
** previously entered by the same thread.  {U17032} The behavior
** is undefined if the mutex is not currently entered by the
** calling thread or is not currently allocated.  {F17033} SQLite will
** never do either. {END}
**
** See also: [sqlite3_mutex_held()] and [sqlite3_mutex_notheld()].
*/
sqlite3_mutex *sqlite3_mutex_alloc(int);
void sqlite3_mutex_free(sqlite3_mutex*);
void sqlite3_mutex_enter(sqlite3_mutex*);
int sqlite3_mutex_try(sqlite3_mutex*);
void sqlite3_mutex_leave(sqlite3_mutex*);

/*
** CAPI3REF: Mutex Verifcation Routines {F17080}
**
** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routines
** are intended for use inside assert() statements. {F17081} The SQLite core
** never uses these routines except inside an assert() and applications
** are advised to follow the lead of the core.  {F17082} The core only
** provides implementations for these routines when it is compiled
** with the SQLITE_DEBUG flag.  {U17087} External mutex implementations
** are only required to provide these routines if SQLITE_DEBUG is
** defined and if NDEBUG is not defined.
**
** {F17083} These routines should return true if the mutex in their argument
** is held or not held, respectively, by the calling thread. {END}
**
** {X17084} The implementation is not required to provided versions of these
** routines that actually work.
** If the implementation does not provide working
** versions of these routines, it should at least provide stubs
** that always return true so that one does not get spurious
** assertion failures. {END}
**
** {F17085} If the argument to sqlite3_mutex_held() is a NULL pointer then
** the routine should return 1.  {END} This seems counter-intuitive since
** clearly the mutex cannot be held if it does not exist.  But the
** the reason the mutex does not exist is because the build is not
** using mutexes.  And we do not want the assert() containing the
** call to sqlite3_mutex_held() to fail, so a non-zero return is
** the appropriate thing to do.  {F17086} The sqlite3_mutex_notheld() 
** interface should also return 1 when given a NULL pointer.
*/
int sqlite3_mutex_held(sqlite3_mutex*);
int sqlite3_mutex_notheld(sqlite3_mutex*);

/*
** CAPI3REF: Mutex Types {F17001}
**
** {F17002} The [sqlite3_mutex_alloc()] interface takes a single argument
** which is one of these integer constants. {END}
*/
#define SQLITE_MUTEX_FAST             0
#define SQLITE_MUTEX_RECURSIVE        1
#define SQLITE_MUTEX_STATIC_MASTER    2
#define SQLITE_MUTEX_STATIC_MEM       3  /* sqlite3_malloc() */
#define SQLITE_MUTEX_STATIC_MEM2      4  /* sqlite3_release_memory() */
#define SQLITE_MUTEX_STATIC_PRNG      5  /* sqlite3_random() */
#define SQLITE_MUTEX_STATIC_LRU       6  /* lru page list */

/*
** CAPI3REF: Low-Level Control Of Database Files {F11300}
**
** {F11301} The [sqlite3_file_control()] interface makes a direct call to the
** xFileControl method for the [sqlite3_io_methods] object associated
** with a particular database identified by the second argument. {F11302} The
** name of the database is the name assigned to the database by the
** <a href="lang_attach.html">ATTACH</a> SQL command that opened the
** database. {F11303} To control the main database file, use the name "main"
** or a NULL pointer. {F11304} The third and fourth parameters to this routine
** are passed directly through to the second and third parameters of
** the xFileControl method.  {F11305} The return value of the xFileControl
** method becomes the return value of this routine.
**
** {F11306} If the second parameter (zDbName) does not match the name of any
** open database file, then SQLITE_ERROR is returned. {F11307} This error
** code is not remembered and will not be recalled by [sqlite3_errcode()]
** or [sqlite3_errmsg()]. {U11308} The underlying xFileControl method might
** also return SQLITE_ERROR.  {U11309} There is no way to distinguish between
** an incorrect zDbName and an SQLITE_ERROR return from the underlying
** xFileControl method. {END}
**
** See also: [SQLITE_FCNTL_LOCKSTATE]
*/
int sqlite3_file_control(sqlite3*, const char *zDbName, int op, void*);

/*
** CAPI3REF: Testing Interface {F11400}
**
** The sqlite3_test_control() interface is used to read out internal
** state of SQLite and to inject faults into SQLite for testing
** purposes.  The first parameter a operation code that determines
** the number, meaning, and operation of all subsequent parameters.
**
** This interface is not for use by applications.  It exists solely
** for verifying the correct operation of the SQLite library.  Depending
** on how the SQLite library is compiled, this interface might not exist.
**
** The details of the operation codes, their meanings, the parameters
** they take, and what they do are all subject to change without notice.
** Unlike most of the SQLite API, this function is not guaranteed to
** operate consistently from one release to the next.
*/
int sqlite3_test_control(int op, ...);

/*
** CAPI3REF: Testing Interface Operation Codes {F11410}
**
** These constants are the valid operation code parameters used
** as the first argument to [sqlite3_test_control()].
**
** These parameters and their meansing are subject to change
** without notice.  These values are for testing purposes only.
** Applications should not use any of these parameters or the
** [sqlite3_test_control()] interface.
*/
#define SQLITE_TESTCTRL_FAULT_CONFIG             1
#define SQLITE_TESTCTRL_FAULT_FAILURES           2
#define SQLITE_TESTCTRL_FAULT_BENIGN_FAILURES    3
#define SQLITE_TESTCTRL_FAULT_PENDING            4





/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double
#endif

#ifdef __cplusplus
}  /* End of the 'extern "C"' block */
#endif
#endif

Changes to src/xfer.c.

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  remote_has(rid);
  blob_reset(&uuid);
}

/*
** Send a gimme message for every phantom.
*/
static void request_phantoms(Xfer *pXfer){
  Stmt q;
  db_prepare(&q, 
    "SELECT uuid FROM phantom JOIN blob USING(rid)"
    " WHERE NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid)"
  );
  while( db_step(&q)==SQLITE_ROW ){
    const char *zUuid = db_column_text(&q, 0);
    blob_appendf(pXfer->pOut, "gimme %s\n", zUuid);
    pXfer->nGimmeSent++;
  }
  db_finalize(&q);
}

................................................................................

  memset(&xfer, 0, sizeof(xfer));
  blobarray_zero(xfer.aToken, count(xfer.aToken));
  cgi_set_content_type(g.zContentType);
  blob_zero(&xfer.err);
  xfer.pIn = &g.cgiIn;
  xfer.pOut = cgi_output_blob();
  xfer.mxSend = db_get_int("max-download", 1000000);

  db_begin_transaction();
  db_multi_exec(
     "CREATE TEMP TABLE onremote(rid INTEGER PRIMARY KEY);"
  );
  while( blob_line(xfer.pIn, &xfer.line) ){
    xfer.nToken = blob_tokenize(&xfer.line, xfer.aToken, count(xfer.aToken));
................................................................................
    {
      cgi_reset_content();
      @ error bad\scommand:\s%F(blob_str(&xfer.line))
    }
    blobarray_reset(xfer.aToken, xfer.nToken);
  }
  if( isPush ){
    request_phantoms(&xfer);
  }
  if( isPull ){
    create_cluster();
    send_unclustered(&xfer);
  }
  db_end_transaction(0);
}
................................................................................
void client_sync(int pushFlag, int pullFlag, int cloneFlag){
  int go = 1;        /* Loop until zero */
  const char *zSCode = db_get("server-code", "x");
  const char *zPCode = db_get("project-code", 0);
  int nMsg = 0;          /* Number of messages sent or received */
  int nCycle = 0;        /* Number of round trips to the server */
  int nFileSend = 0;


  const char *zCookie;   /* Server cookie */
  Blob send;        /* Text we are sending to the server */
  Blob recv;        /* Reply we got back from the server */
  Xfer xfer;        /* Transfer data */

  memset(&xfer, 0, sizeof(xfer));
  xfer.pIn = &recv;
  xfer.pOut = &send;
................................................................................
      blob_appendf(&send, "cookie %s\n", zCookie);
    }
    
    /* Generate gimme messages for phantoms and leaf messages
    ** for all leaves.
    */
    if( pullFlag || cloneFlag ){
      request_phantoms(&xfer);
    }
    if( pushFlag ){
      send_unsent(&xfer);
      nMsg += send_unclustered(&xfer);
    }

    /* Exchange messages with the server */
................................................................................
    blob_reset(&recv);
    nCycle++;
    go = 0;

    /* If we received one or more files on the previous exchange but
    ** there are still phantoms, then go another round.
    */
    if( (xfer.nFileRcvd+xfer.nDeltaRcvd+xfer.nDanglingFile>0 || newPhantom)
         && db_exists("SELECT 1 FROM phantom")
    ){
      go = 1;


    }
    nMsg = 0;
    xfer.nFileRcvd = 0;
    xfer.nDeltaRcvd = 0;
    xfer.nDanglingFile = 0;

    /* If we have one or more files queued to send, then go







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  remote_has(rid);
  blob_reset(&uuid);
}

/*
** Send a gimme message for every phantom.
*/
static void request_phantoms(Xfer *pXfer, int maxReq){
  Stmt q;
  db_prepare(&q, 
    "SELECT uuid FROM phantom JOIN blob USING(rid)"
    " WHERE NOT EXISTS(SELECT 1 FROM shun WHERE uuid=blob.uuid)"
  );
  while( db_step(&q)==SQLITE_ROW && maxReq-- > 0 ){
    const char *zUuid = db_column_text(&q, 0);
    blob_appendf(pXfer->pOut, "gimme %s\n", zUuid);
    pXfer->nGimmeSent++;
  }
  db_finalize(&q);
}

................................................................................

  memset(&xfer, 0, sizeof(xfer));
  blobarray_zero(xfer.aToken, count(xfer.aToken));
  cgi_set_content_type(g.zContentType);
  blob_zero(&xfer.err);
  xfer.pIn = &g.cgiIn;
  xfer.pOut = cgi_output_blob();
  xfer.mxSend = db_get_int("max-download", 5000000);

  db_begin_transaction();
  db_multi_exec(
     "CREATE TEMP TABLE onremote(rid INTEGER PRIMARY KEY);"
  );
  while( blob_line(xfer.pIn, &xfer.line) ){
    xfer.nToken = blob_tokenize(&xfer.line, xfer.aToken, count(xfer.aToken));
................................................................................
    {
      cgi_reset_content();
      @ error bad\scommand:\s%F(blob_str(&xfer.line))
    }
    blobarray_reset(xfer.aToken, xfer.nToken);
  }
  if( isPush ){
    request_phantoms(&xfer, 500);
  }
  if( isPull ){
    create_cluster();
    send_unclustered(&xfer);
  }
  db_end_transaction(0);
}
................................................................................
void client_sync(int pushFlag, int pullFlag, int cloneFlag){
  int go = 1;        /* Loop until zero */
  const char *zSCode = db_get("server-code", "x");
  const char *zPCode = db_get("project-code", 0);
  int nMsg = 0;          /* Number of messages sent or received */
  int nCycle = 0;        /* Number of round trips to the server */
  int nFileSend = 0;
  int nFileRecv;          /* Number of files received */
  int mxPhantomReq = 200; /* Max number of phantoms to request per comm */
  const char *zCookie;    /* Server cookie */
  Blob send;        /* Text we are sending to the server */
  Blob recv;        /* Reply we got back from the server */
  Xfer xfer;        /* Transfer data */

  memset(&xfer, 0, sizeof(xfer));
  xfer.pIn = &recv;
  xfer.pOut = &send;
................................................................................
      blob_appendf(&send, "cookie %s\n", zCookie);
    }
    
    /* Generate gimme messages for phantoms and leaf messages
    ** for all leaves.
    */
    if( pullFlag || cloneFlag ){
      request_phantoms(&xfer, mxPhantomReq);
    }
    if( pushFlag ){
      send_unsent(&xfer);
      nMsg += send_unclustered(&xfer);
    }

    /* Exchange messages with the server */
................................................................................
    blob_reset(&recv);
    nCycle++;
    go = 0;

    /* If we received one or more files on the previous exchange but
    ** there are still phantoms, then go another round.
    */
    nFileRecv = xfer.nFileRcvd + xfer.nDeltaRcvd + xfer.nDanglingFile;
    if( (nFileRecv>0 || newPhantom) && db_exists("SELECT 1 FROM phantom") ){

      go = 1;
      mxPhantomReq = nFileRecv*2;
      if( mxPhantomReq<200 ) mxPhantomReq = 200;
    }
    nMsg = 0;
    xfer.nFileRcvd = 0;
    xfer.nDeltaRcvd = 0;
    xfer.nDanglingFile = 0;

    /* If we have one or more files queued to send, then go