if( ALWAYS(rc>=0) && rc<(int)(sizeof(aMsg)/sizeof(aMsg[0])) && aMsg[rc]!=0 ){
    return aMsg[rc];
  }else{
    return "unknown error";
  }
}

#ifndef SQLITE4_OMIT_PROGRESS_CALLBACK
/*
** This routine sets the progress callback for an Sqlite database to the
** given callback function with the given argument. The progress callback will
** be invoked every nOps opcodes.
*/
void sqlite4_progress_handler(
  sqlite4 *db, 
  int nOps,
  int (*xProgress)(void*), 
  void *pArg
){
  sqlite4_mutex_enter(db->mutex);
  if( nOps>0 ){
    db->xProgress = xProgress;
    db->nProgressOps = nOps;
    db->pProgressArg = pArg;
  }else{
    db->xProgress = 0;
    db->nProgressOps = 0;
    db->pProgressArg = 0;
  }
  sqlite4_mutex_leave(db->mutex);
}
#endif

/*
** Cause any pending operation to stop at its earliest opportunity.
*/
void sqlite4_interrupt(sqlite4 *db){
  db->u1.isInterrupted = 1;
}

  if( ALWAYS(rc>=0) && rc<(int)(sizeof(aMsg)/sizeof(aMsg[0])) && aMsg[rc]!=0 ){
    return aMsg[rc];
  }else{
    return "unknown error";
  }
}



























/*
** Cause any pending operation to stop at its earliest opportunity.
*/
void sqlite4_interrupt(sqlite4 *db){
  db->u1.isInterrupted = 1;
}

void sqlite4_profile(
  sqlite4*,
  void *,
  void(*xProfile)(void*,const char*,sqlite4_uint64),
  void(*xDestroy)(void*)
);

/*
** CAPIREF: Query Progress Callbacks
**
** ^The sqlite4_progress_handler(D,N,X,P) interface causes the callback
** function X to be invoked periodically during long running calls to
** [sqlite4_exec()] and [sqlite4_step()] for
** database connection D.  An example use for this
** interface is to keep a GUI updated during a large query.
**
** ^The parameter P is passed through as the only parameter to the 
** callback function X.  ^The parameter N is the number of 
** [virtual machine instructions] that are evaluated between successive
** invocations of the callback X.
**
** ^Only a single progress handler may be defined at one time per
** [database connection]; setting a new progress handler cancels the
** old one.  ^Setting parameter X to NULL disables the progress handler.
** ^The progress handler is also disabled by setting N to a value less
** than 1.
**
** ^If the progress callback returns non-zero, the operation is
** interrupted.  This feature can be used to implement a
** "Cancel" button on a GUI progress dialog box.
**
** The progress handler callback must not do anything that will modify
** the database connection that invoked the progress handler.
** Note that [sqlite4_prepare()] and [sqlite4_step()] both modify their
** database connections for the meaning of "modify" in this paragraph.
**
*/
void sqlite4_progress_handler(sqlite4*, int, int(*)(void*), void*);

/*
** CAPIREF: Opening A New Database Connection
**
** ^These routines open an SQLite4 database file as specified by the 
** URI argument.
** ^(A [database connection] handle is usually
** returned in *ppDb, even if an error occurs.  The only exception is that
................................................................................
);

/*
** CAPIREF: Load An Extension
**
** ^This interface loads an SQLite extension library from the named file.
**
** ^The sqlite4_load_extension() interface attempts 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 "sqlite4_extension_init".
** ^The sqlite4_load_extension() interface returns
** [SQLITE4_OK] on success and [SQLITE4_ERROR] if something goes wrong.
** ^If an error occurs and pzErrMsg is not 0, then the
** [sqlite4_load_extension()] interface shall attempt to
** fill *pzErrMsg with error message text stored in memory
** obtained from [sqlite4_malloc()]. The calling function
** should free this memory by calling [sqlite4_free()].
**
** ^Extension loading must be enabled using
** [sqlite4_enable_load_extension()] prior to calling this API,
** otherwise an error will be returned.



**
** See also the [load_extension() SQL function].
*/
int sqlite4_load_extension(
  sqlite4 *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 */
);

/*
** CAPIREF: 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

void sqlite4_profile(
  sqlite4*,
  void *,
  void(*xProfile)(void*,const char*,sqlite4_uint64),
  void(*xDestroy)(void*)
);

































/*
** CAPIREF: Opening A New Database Connection
**
** ^These routines open an SQLite4 database file as specified by the 
** URI argument.
** ^(A [database connection] handle is usually
** returned in *ppDb, even if an error occurs.  The only exception is that
................................................................................
);

/*
** CAPIREF: Load An Extension
**
** ^This interface loads an SQLite extension library from the named file.
**
** ^The sqlite4_load_extension() interface attempts 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 "sqlite4_extension_init". ^The 
** sqlite4_load_extension() interface returns [SQLITE4_OK] on success 
** and [SQLITE4_ERROR] if something goes wrong.





**
** ^Extension loading must be enabled using [sqlite4_enable_load_extension()] 

** prior to calling this API, otherwise an error will be returned.
**
** This function sets the values returned by sqlite4_errcode() and
** sqlite4_errmsg() before returning.
**
** See also the [load_extension() SQL function].
*/
int sqlite4_load_extension(
  sqlite4 *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 */

);

/*
** CAPIREF: 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