SQLite

** During testing, the special md5sum() aggregate function is available.
** inside SQLite.  The following routines implement that function.
*/
static void md5step(sqlite_func *context, int argc, const char **argv){
  MD5Context *p;
  int i;
  if( argc<1 ) return;
  p = sqlite3_aggregate_context(context, sizeof(*p));
  if( p==0 ) return;
  if( sqlite3_aggregate_count(context)==1 ){
    MD5Init(p);
  }
  for(i=0; i<argc; i++){
    if( argv[i] ){
      MD5Update(p, (unsigned char*)argv[i], strlen(argv[i]));
    }
  }
}
static void md5finalize(sqlite_func *context){
  MD5Context *p;
  unsigned char digest[16];
  char zBuf[33];
  p = sqlite3_aggregate_context(context, sizeof(*p));
  MD5Final(digest,p);
  DigestToBase16(digest, zBuf);
  sqlite3_set_result_string(context, zBuf, strlen(zBuf));
}
void Md5_Register(sqlite *db){
  sqlite3_create_aggregate(db, "md5sum", -1, md5step, md5finalize, 0);
}

/*
** If we compile with the SQLITE_TEST macro set, then the following block
** of code will give us the ability to simulate a disk I/O error.  This
** is used for testing the I/O recovery logic.
*/
#ifdef SQLITE_TEST
int sqlite3_io_error_pending = 0;
#define SimulateIOError(A)  \
   if( sqlite3_io_error_pending ) \
     if( sqlite3_io_error_pending-- == 1 ){ local_ioerr(); return A; }
static void local_ioerr(){
  sqlite3_io_error_pending = 0;  /* Really just a place to set a breakpoint */
}
#else
#define SimulateIOError(A)
#endif

/*
** When testing, keep a count of the number of open files.
*/
#ifdef SQLITE_TEST
int sqlite3_open_file_count = 0;
#define OpenCounter(X)  sqlite3_open_file_count+=(X)
#else
#define OpenCounter(X)
#endif


/*
** Delete the named file

}

/*
** The following variable, if set to a non-zero value, becomes the result
** returned from sqlite3OsCurrentTime().  This is used for testing.
*/
#ifdef SQLITE_TEST
int sqlite3_current_time = 0;
#endif

/*
** Find the current time (in Universal Coordinated Time).  Write the
** current time and date as a Julian Day number into *prNow and
** return 0.  Return 1 if the time and date cannot be found.
*/

  */
  double now;
  GetSystemTimeAsFileTime( &ft );
  now = ((double)ft.dwHighDateTime) * 4294967296.0; 
  *prNow = (now + ft.dwLowDateTime)/864000000000.0 + 2305813.5;
#endif
#ifdef SQLITE_TEST
  if( sqlite3_current_time ){
    *prNow = sqlite3_current_time/86400.0 + 2440587.5;
  }
#endif
  return 0;
}

** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.106 2004/05/10 10:34:49 danielk1977 Exp $
*/
#include "os.h"         /* Must be first to enable large file support */
#include "sqliteInt.h"
#include "pager.h"
#include <assert.h>
#include <string.h>

  OsFile fd;
  int rc, i;
  int tempFile;
  int readOnly = 0;
  char zTemp[SQLITE_TEMPNAME_SIZE];

  *ppPager = 0;
  if( sqlite3_malloc_failed ){
    return SQLITE_NOMEM;
  }
  if( zFilename && zFilename[0] ){
    zFullPathname = sqlite3OsFullPathname(zFilename);
    rc = sqlite3OsOpenReadWrite(zFullPathname, &fd, &readOnly);
    tempFile = 0;
  }else{
    rc = sqlite3pager_opentemp(zTemp, &fd);
    zFilename = zTemp;
    zFullPathname = sqlite3OsFullPathname(zFilename);
    tempFile = 1;
  }
  if( sqlite3_malloc_failed ){
    return SQLITE_NOMEM;
  }
  if( rc!=SQLITE_OK ){
    sqliteFree(zFullPathname);
    return SQLITE_CANTOPEN;
  }
  nameLen = strlen(zFullPathname);

  return z;
}

/*
** Print into memory obtained from malloc().  Do not use the internal
** %-conversion extensions.  This routine is for use by external users.
*/
char *sqlite3_mprintf(const char *zFormat, ...){
  va_list ap;
  char *z;
  char zBuf[200];

  va_start(ap,zFormat);
  z = base_vprintf((void*(*)(void*,int))realloc, 0, 
                   zBuf, sizeof(zBuf), zFormat, ap);
  va_end(ap);
  return z;
}

/* This is the varargs version of sqlite3_mprintf.  
*/
char *sqlite3_vmprintf(const char *zFormat, va_list ap){
  char zBuf[200];
  return base_vprintf((void*(*)(void*,int))realloc, 0,
                      zBuf, sizeof(zBuf), zFormat, ap);
}

/*
** sqlite3_snprintf() works like snprintf() except that it ignores the
** current locale settings.  This is important for SQLite because we
** are not able to use a "," as the decimal point in place of "." as
** specified by some locales.
*/
char *sqlite3_snprintf(int n, char *zBuf, const char *zFormat, ...){
  char *z;
  va_list ap;

  va_start(ap,zFormat);
  z = base_vprintf(0, 0, zBuf, n, zFormat, ap);
  va_end(ap);
  return z;
}

/*
** The following four routines implement the varargs versions of the
** sqlite3_exec() and sqlite3_get_table() interfaces.  See the sqlite.h
** header files for a more detailed description of how these interfaces
** work.
**
** These routines are all just simple wrappers.
*/
int sqlite3_exec_printf(
  sqlite *db,                   /* An open database */
  const char *sqlFormat,        /* printf-style format string for the SQL */
  sqlite_callback xCallback,    /* Callback function */
  void *pArg,                   /* 1st argument to callback function */
  char **errmsg,                /* Error msg written here */
  ...                           /* Arguments to the format string. */
){
  va_list ap;
  int rc;

  va_start(ap, errmsg);
  rc = sqlite3_exec_vprintf(db, sqlFormat, xCallback, pArg, errmsg, ap);
  va_end(ap);
  return rc;
}
int sqlite3_exec_vprintf(
  sqlite *db,                   /* An open database */
  const char *sqlFormat,        /* printf-style format string for the SQL */
  sqlite_callback xCallback,    /* Callback function */
  void *pArg,                   /* 1st argument to callback function */
  char **errmsg,                /* Error msg written here */
  va_list ap                    /* Arguments to the format string. */
){
  char *zSql;
  int rc;

  zSql = sqlite3_vmprintf(sqlFormat, ap);
  rc = sqlite3_exec(db, zSql, xCallback, pArg, errmsg);
  free(zSql);
  return rc;
}
int sqlite3_get_table_printf(
  sqlite *db,            /* An open database */
  const char *sqlFormat, /* printf-style format string for the SQL */
  char ***resultp,       /* Result written to a char *[]  that this points to */
  int *nrow,             /* Number of result rows written here */
  int *ncol,             /* Number of result columns written here */
  char **errmsg,         /* Error msg written here */
  ...                    /* Arguments to the format string */
){
  va_list ap;
  int rc;

  va_start(ap, errmsg);
  rc = sqlite3_get_table_vprintf(db, sqlFormat, resultp, nrow, ncol, errmsg, ap);
  va_end(ap);
  return rc;
}
int sqlite3_get_table_vprintf(
  sqlite *db,            /* An open database */
  const char *sqlFormat, /* printf-style format string for the SQL */
  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 */
  va_list ap             /* Arguments to the format string */
){
  char *zSql;
  int rc;

  zSql = sqlite3_vmprintf(sqlFormat, ap);
  rc = sqlite3_get_table(db, zSql, resultp, nrow, ncolumn, errmsg);
  free(zSql);
  return rc;
}

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle SELECT statements in SQLite.
**
** $Id: select.c,v 1.163 2004/05/10 10:34:49 danielk1977 Exp $
*/
#include "sqliteInt.h"


/*
** Allocate a new Select structure and return a pointer to that
** structure.

){
  Vdbe *v = pParse->pVdbe;
  int i, j;
  sqlite *db = pParse->db;
  int fullNames, shortNames;

  assert( v!=0 );
  if( pParse->colNamesSet || v==0 || sqlite3_malloc_failed ) return;
  pParse->colNamesSet = 1;
  fullNames = (db->flags & SQLITE_FullColNames)!=0;
  shortNames = (db->flags & SQLITE_ShortColNames)!=0;
  for(i=0; i<pEList->nExpr; i++){
    Expr *p;
    int p2 = i==pEList->nExpr-1;
    p = pEList->a[i].pExpr;

  ExprList *pOrderBy;    /* The ORDER BY clause.  May be NULL */
  ExprList *pGroupBy;    /* The GROUP BY clause.  May be NULL */
  Expr *pHaving;         /* The HAVING clause.  May be NULL */
  int isDistinct;        /* True if the DISTINCT keyword is present */
  int distinct;          /* Table to use for the distinct set */
  int rc = 1;            /* Value to return from this function */

  if( sqlite3_malloc_failed || pParse->nErr || p==0 ) return 1;
  if( sqlite3AuthCheck(pParse, SQLITE_SELECT, 0, 0, 0) ) return 1;

  /* If there is are a sequence of queries, do the earlier ones first.
  */
  if( p->pPrior ){
    return multiSelect(pParse, p, eDest, iParm);
  }

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains code to implement the "sqlite" command line
** utility for accessing SQLite databases.
**
** $Id: shell.c,v 1.95 2004/05/10 10:34:52 danielk1977 Exp $
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "sqlite.h"
#include <ctype.h>

}

/*
** This routine runs when the user presses Ctrl-C
*/
static void interrupt_handler(int NotUsed){
  seenInterrupt = 1;
  if( db ) sqlite3_interrupt(db);
}

/*
** This is the callback routine that the SQLite library
** invokes for each row of a query result.
*/
static int callback(void *pArg, int nArg, char **azArg, char **azCol){

  fprintf(p->out, "%s;\n", azArg[2]);
  if( strcmp(azArg[1],"table")==0 ){
    struct callback_data d2;
    d2 = *p;
    d2.mode = MODE_Insert;
    d2.zDestTable = 0;
    set_table_name(&d2, azArg[0]);
    sqlite3_exec_printf(p->db,
       "SELECT * FROM '%q'",
       callback, &d2, 0, azArg[0]
    );
    set_table_name(&d2, 0);
  }
  return 0;
}

** the database fails to open, print an error message and exit.
*/
static void open_db(struct callback_data *p){
  if( p->db==0 ){
    char *zErrMsg = 0;
#ifdef SQLITE_HAS_CODEC
    int n = p->zKey ? strlen(p->zKey) : 0;
    db = p->db = sqlite3_open_encrypted(p->zDbFilename, p->zKey, n, 0, &zErrMsg);
#else
    db = p->db = sqlite3_open(p->zDbFilename, 0, &zErrMsg);
#endif
    if( p->db==0 ){
      if( zErrMsg ){
        fprintf(stderr,"Unable to open database \"%s\": %s\n", 
           p->zDbFilename, zErrMsg);
      }else{
        fprintf(stderr,"Unable to open database %s\n", p->zDbFilename);

    open_db(p);
    memcpy(&data, p, sizeof(data));
    data.showHeader = 1;
    data.mode = MODE_Column;
    data.colWidth[0] = 3;
    data.colWidth[1] = 15;
    data.colWidth[2] = 58;
    sqlite3_exec(p->db, "PRAGMA database_list; ", callback, &data, &zErrMsg);
    if( zErrMsg ){
      fprintf(stderr,"Error: %s\n", zErrMsg);
      sqlite3_freemem(zErrMsg);
    }
  }else

  if( c=='d' && strncmp(azArg[0], "dump", n)==0 ){
    char *zErrMsg = 0;
    open_db(p);
    fprintf(p->out, "BEGIN TRANSACTION;\n");
    if( nArg==1 ){
      sqlite3_exec(p->db,
        "SELECT name, type, sql FROM sqlite_master "
        "WHERE type!='meta' AND sql NOT NULL "
        "ORDER BY substr(type,2,1), name",
        dump_callback, p, &zErrMsg
      );
    }else{
      int i;
      for(i=1; i<nArg && zErrMsg==0; i++){
        sqlite3_exec_printf(p->db,
          "SELECT name, type, sql FROM sqlite_master "
          "WHERE tbl_name LIKE '%q' AND type!='meta' AND sql NOT NULL "
          "ORDER BY substr(type,2,1), name",
          dump_callback, p, &zErrMsg, azArg[i]
        );
      }
    }
    if( zErrMsg ){
      fprintf(stderr,"Error: %s\n", zErrMsg);
      sqlite3_freemem(zErrMsg);
    }else{
      fprintf(p->out, "COMMIT;\n");
    }
  }else

  if( c=='e' && strncmp(azArg[0], "echo", n)==0 && nArg>1 ){
    int j;

  if( c=='i' && strncmp(azArg[0], "indices", n)==0 && nArg>1 ){
    struct callback_data data;
    char *zErrMsg = 0;
    open_db(p);
    memcpy(&data, p, sizeof(data));
    data.showHeader = 0;
    data.mode = MODE_List;
    sqlite3_exec_printf(p->db,
      "SELECT name FROM sqlite_master "
      "WHERE type='index' AND tbl_name LIKE '%q' "
      "UNION ALL "
      "SELECT name FROM sqlite_temp_master "
      "WHERE type='index' AND tbl_name LIKE '%q' "
      "ORDER BY 1",
      callback, &data, &zErrMsg, azArg[1], azArg[1]
    );
    if( zErrMsg ){
      fprintf(stderr,"Error: %s\n", zErrMsg);
      sqlite3_freemem(zErrMsg);
    }
  }else

  if( c=='m' && strncmp(azArg[0], "mode", n)==0 && nArg>=2 ){
    int n2 = strlen(azArg[1]);
    if( strncmp(azArg[1],"line",n2)==0
        ||

    char *zOld = p->zKey;
    if( zOld==0 ) zOld = "";
    if( strcmp(azArg[1],zOld) ){
      fprintf(stderr,"old key is incorrect\n");
    }else if( strcmp(azArg[2], azArg[3]) ){
      fprintf(stderr,"2nd copy of new key does not match the 1st\n");
    }else{
      sqlite3_freemem(p->zKey);
      p->zKey = sqlite3_mprintf("%s", azArg[2]);
      sqlite_rekey(p->db, p->zKey, strlen(p->zKey));
    }
  }else
#endif

  if( c=='s' && strncmp(azArg[0], "schema", n)==0 ){
    struct callback_data data;

                      "  sql text\n"
                      ")";
        new_argv[1] = 0;
        new_colv[0] = "sql";
        new_colv[1] = 0;
        callback(&data, 1, new_argv, new_colv);
      }else{
        sqlite3_exec_printf(p->db,
          "SELECT sql FROM "
          "  (SELECT * FROM sqlite_master UNION ALL"
          "   SELECT * FROM sqlite_temp_master) "
          "WHERE tbl_name LIKE '%q' AND type!='meta' AND sql NOTNULL "
          "ORDER BY substr(type,2,1), name",
          callback, &data, &zErrMsg, azArg[1]);
      }
    }else{
      sqlite3_exec(p->db,
         "SELECT sql FROM "
         "  (SELECT * FROM sqlite_master UNION ALL"
         "   SELECT * FROM sqlite_temp_master) "
         "WHERE type!='meta' AND sql NOTNULL "
         "ORDER BY substr(type,2,1), name",
         callback, &data, &zErrMsg
      );
    }
    if( zErrMsg ){
      fprintf(stderr,"Error: %s\n", zErrMsg);
      sqlite3_freemem(zErrMsg);
    }
  }else

  if( c=='s' && strncmp(azArg[0], "separator", n)==0 && nArg==2 ){
    sprintf(p->separator, "%.*s", (int)ArraySize(p->separator)-1, azArg[1]);
  }else

  if( c=='t' && n>1 && strncmp(azArg[0], "tables", n)==0 ){
    char **azResult;
    int nRow, rc;
    char *zErrMsg;
    open_db(p);
    if( nArg==1 ){
      rc = sqlite3_get_table(p->db,
        "SELECT name FROM sqlite_master "
        "WHERE type IN ('table','view') "
        "UNION ALL "
        "SELECT name FROM sqlite_temp_master "
        "WHERE type IN ('table','view') "
        "ORDER BY 1",
        &azResult, &nRow, 0, &zErrMsg
      );
    }else{
      rc = sqlite3_get_table_printf(p->db,
        "SELECT name FROM sqlite_master "
        "WHERE type IN ('table','view') AND name LIKE '%%%q%%' "
        "UNION ALL "
        "SELECT name FROM sqlite_temp_master "
        "WHERE type IN ('table','view') AND name LIKE '%%%q%%' "
        "ORDER BY 1",
        &azResult, &nRow, 0, &zErrMsg, azArg[1], azArg[1]
      );
    }
    if( zErrMsg ){
      fprintf(stderr,"Error: %s\n", zErrMsg);
      sqlite3_freemem(zErrMsg);
    }
    if( rc==SQLITE_OK ){
      int len, maxlen = 0;
      int i, j;
      int nPrintCol, nPrintRow;
      for(i=1; i<=nRow; i++){
        if( azResult[i]==0 ) continue;

        for(j=i+1; j<=nRow; j+=nPrintRow){
          char *zSp = j<=nPrintRow ? "" : "  ";
          printf("%s%-*s", zSp, maxlen, azResult[j] ? azResult[j] : "");
        }
        printf("\n");
      }
    }
    sqlite3_free_table(azResult);
  }else

  if( c=='t' && n>1 && strncmp(azArg[0], "timeout", n)==0 && nArg>=2 ){
    open_db(p);
    sqlite3_busy_timeout(p->db, atoi(azArg[1]));
  }else

  if( c=='w' && strncmp(azArg[0], "width", n)==0 ){
    int j;
    for(j=1; j<nArg && j<ArraySize(p->colWidth); j++){
      p->colWidth[j-1] = atoi(azArg[j]);
    }

        exit(1);
      }
      strcpy(&zSql[nSql++], "\n");
      strcpy(&zSql[nSql], zLine);
      nSql += len;
    }
    free(zLine);
    if( zSql && _ends_with_semicolon(zSql, nSql) && sqlite3_complete(zSql) ){
      p->cnt = 0;
      open_db(p);
      rc = sqlite3_exec(p->db, zSql, callback, p, &zErrMsg);
      if( rc || zErrMsg ){
        if( in!=0 && !p->echoOn ) printf("%s\n",zSql);
        if( zErrMsg!=0 ){
          printf("SQL error: %s\n", zErrMsg);
          sqlite3_freemem(zErrMsg);
          zErrMsg = 0;
        }else{
          printf("SQL error: %s\n", sqlite3_error_string(rc));
        }
      }
      free(zSql);
      zSql = 0;
      nSql = 0;
    }
  }

    if( strcmp(argv[i],"-separator")==0 || strcmp(argv[i],"-nullvalue")==0 ){
      i++;
    }else if( strcmp(argv[i],"-init")==0 ){
      i++;
      zInitFile = argv[i];
    }else if( strcmp(argv[i],"-key")==0 ){
      i++;
      data.zKey = sqlite3_mprintf("%s",argv[i]);
    }
  }
  if( i<argc ){
    data.zDbFilename = argv[i++];
  }else{
    data.zDbFilename = ":memory:";
  }

    }else if( strcmp(z,"-header")==0 ){
      data.showHeader = 1;
    }else if( strcmp(z,"-noheader")==0 ){
      data.showHeader = 0;
    }else if( strcmp(z,"-echo")==0 ){
      data.echoOn = 1;
    }else if( strcmp(z,"-version")==0 ){
      printf("%s\n", sqlite3_version);
      return 1;
    }else if( strcmp(z,"-help")==0 ){
      usage(1);
    }else{
      fprintf(stderr,"%s: unknown option: %s\n", Argv0, z);
      fprintf(stderr,"Use -help for a list of options.\n");
      return 1;
    }
  }

  if( zFirstCmd ){
    /* Run just the command that follows the database name
    */
    if( zFirstCmd[0]=='.' ){
      do_meta_command(zFirstCmd, &data);
      exit(0);
    }else{
      int rc;
      open_db(&data);
      rc = sqlite3_exec(data.db, zFirstCmd, callback, &data, &zErrMsg);
      if( rc!=0 && zErrMsg!=0 ){
        fprintf(stderr,"SQL error: %s\n", zErrMsg);
        exit(1);
      }
    }
  }else{
    /* Run commands received from standard input
    */
    if( isatty(fileno(stdout)) && isatty(fileno(stdin)) ){
      char *zHome;
      char *zHistory = 0;
      printf(
        "SQLite version %s\n"
        "Enter \".help\" for instructions\n",
        sqlite3_version
      );
      zHome = find_home_dir();
      if( zHome && (zHistory = malloc(strlen(zHome)+20))!=0 ){
        sprintf(zHistory,"%s/.sqlite_history", zHome);
      }
      if( zHistory ) read_history(zHistory);
      process_input(&data, 0);
      if( zHistory ){
        stifle_history(100);
        write_history(zHistory);
      }
    }else{
      process_input(&data, stdin);
    }
  }
  set_table_name(&data, 0);
  if( db ) sqlite3_close(db);
  return 0;
}

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the SQLite library
** presents to client programs.
**
** @(#) $Id: sqlite.h.in,v 1.62 2004/05/10 10:34:52 danielk1977 Exp $
*/
#ifndef _SQLITE_H_
#define _SQLITE_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.

#define SQLITE_VERSION         "--VERS--"

/*
** The version string is also compiled into the library so that a program
** can check to make sure that the lib*.a file and the *.h file are from
** the same version.
*/
extern const char sqlite3_version[];

/*
** The SQLITE_UTF8 macro is defined if the library expects to see
** UTF-8 encoded data.  The SQLITE_ISO8859 macro is defined if the
** iso8859 encoded should be used.
*/
#define SQLITE_--ENCODING-- 1

/*
** The following constant holds one of two strings, "UTF-8" or "iso8859",
** depending on which character encoding the SQLite library expects to
** see.  The character encoding makes a difference for the LIKE and GLOB
** operators and for the LENGTH() and SUBSTR() functions.
*/
extern const char sqlite3_encoding[];

/*
** Each open sqlite database is represented by an instance of the
** following opaque structure.
*/
typedef struct sqlite sqlite;

** database is opened read-only.
**
** The Truth:  As currently implemented, all databases are opened
** for writing all the time.  Maybe someday we will provide the
** ability to open a database readonly.  The mode parameters is
** provided in anticipation of that enhancement.
*/
sqlite *sqlite3_open(const char *filename, int mode, char **errmsg);

/*
** A function to close the database.
**
** Call this function with a pointer to a structure that was previously
** returned from sqlite3_open() and the corresponding database will by closed.
*/
void sqlite3_close(sqlite *);

/*
** The type for a callback function.
*/
typedef int (*sqlite_callback)(void*,int,char**, char**);

/*
** A function to executes one or more statements of SQL.
**
** 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 is an arbitrary pointer that is passed
** 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.
** The 4th parameter to the callback is an array of strings 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 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_freemem() 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 return code if there is an error.  The particular
** return value depends on the type of error. 
**
** If the query could not be executed because a database file is
** locked or busy, then this function returns SQLITE_BUSY.  (This
** behavior can be modified somewhat using the sqlite3_busy_handler()
** and sqlite3_busy_timeout() functions below.)
*/
int sqlite3_exec(
  sqlite*,                      /* An open database */
  const char *sql,              /* SQL to be executed */
  sqlite_callback,              /* Callback function */
  void *,                       /* 1st argument to callback function */
  char **errmsg                 /* Error msg written here */
);

/*
** Return values for sqlite3_exec() and sqlite3_step()
*/
#define SQLITE_OK           0   /* Successful result */
#define SQLITE_ERROR        1   /* SQL error or missing database */
#define SQLITE_INTERNAL     2   /* An 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_IOERR       10   /* Some kind of disk I/O error occurred */
#define SQLITE_CORRUPT     11   /* The database disk image is malformed */
#define SQLITE_NOTFOUND    12   /* (Internal Only) 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   /* Database lock protocol error */
#define SQLITE_EMPTY       16   /* (Internal Only) Database table is empty */
#define SQLITE_SCHEMA      17   /* The database schema changed */
#define SQLITE_TOOBIG      18   /* Too much data for one row of a table */
#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 */

/*
** Each entry in an SQLite table has a unique integer key.  (The key is
** the value of the INTEGER PRIMARY KEY column if there is such a column,
** otherwise the key is generated at random.  The unique key is always
** available as the ROWID, OID, or _ROWID_ column.)  The following routine
** returns the integer key of the most recent insert in the database.
**
** This function is similar to the mysql_insert_id() function from MySQL.
*/
int sqlite3_last_insert_rowid(sqlite*);

/*
** This function returns the number of database rows that were changed
** (or inserted or deleted) by the most recent called sqlite3_exec().
**
** 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() 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 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_changes(sqlite*);

/*
** This function returns the number of database rows that were changed
** by the last INSERT, UPDATE, or DELETE statment executed by sqlite3_exec(),
** or by the last VM to run to completion. The change count is not updated
** by SQL statements other than INSERT, UPDATE or DELETE.
**
** Changes are counted, even if they are later undone by a ROLLBACK or
** ABORT. Changes associated with trigger programs that execute as a
** result of the INSERT, UPDATE, or DELETE statement are not counted.
**
** If a callback invokes sqlite3_exec() 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 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.
**
******* THIS IS AN EXPERIMENTAL API AND IS SUBJECT TO CHANGE ******
*/
int sqlite3_last_statement_changes(sqlite*);

/* If the parameter to this routine is one of the return value constants
** defined above, then this routine returns a constant text string which
** descripts (in English) the meaning of the return value.
*/
const char *sqlite3_error_string(int);
#define sqliteErrStr sqlite3_error_string  /* Legacy. Do not use in new code. */

/* 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.
*/
void sqlite3_interrupt(sqlite*);


/* This function returns true if the given input string comprises
** one or more complete SQL statements.
**
** The algorithm is simple.  If the last token other than spaces
** and comments is a semicolon, then return true.  otherwise return
** false.
*/
int sqlite3_complete(const char *sql);

/*
** This routine identifies a callback function that is invoked
** whenever an attempt is made to open a database table that is
** currently locked by another process or thread.  If the busy callback
** is NULL, then sqlite3_exec() returns SQLITE_BUSY immediately if
** it finds a locked table.  If the busy callback is not NULL, then
** sqlite3_exec() invokes the callback with three arguments.  The
** second argument is the name of the locked table and the third
** argument is the number of times the table has been busy.  If the
** busy callback returns 0, then sqlite3_exec() immediately returns
** SQLITE_BUSY.  If the callback returns non-zero, then sqlite3_exec()
** tries to open the table again and the cycle repeats.
**
** The default busy callback is NULL.
**
** 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 coredump.
*/
void sqlite3_busy_handler(sqlite*, int(*)(void*,const char*,int), void*);

/*
** 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" milleseconds of sleeping have been done.  After
** "ms" milleseconds of sleeping, the handler returns 0 which
** causes sqlite3_exec() to return SQLITE_BUSY.
**
** Calling this routine with an argument less than or equal to zero
** turns off all busy handlers.
*/
void sqlite3_busy_timeout(sqlite*, int ms);

/*
** This next routine is really just a 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 malloc(), then returns all of the result after the
** query has finished. 
**
** As an example, suppose the query result where this table:
**

**
** 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 
** malloc() happens, the calling function must not try to call 
** malloc() 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(
  sqlite*,               /* 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 */
);

/*
** Call this routine to free the memory that sqlite3_get_table() allocated.
*/
void sqlite3_free_table(char **result);

/*
** The following routines are wrappers around sqlite3_exec() and
** sqlite3_get_table().  The only difference between the routines that
** follow and the originals is that the second argument to the 
** routines that follow is really a printf()-style format
** string describing the SQL to be executed.  Arguments to the format
** string appear at the end of the argument list.
**
** All of the usual printf formatting options apply.  In addition, there
** is a "%q" option.  %q 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.
**
** For example, so some string variable contains text as follows:
**
**      char *zText = "It's a happy day!";
**
** We can use this text in an SQL statement as follows:
**
**      sqlite3_exec_printf(db, "INSERT INTO table VALUES('%q')",
**          callback1, 0, 0, zText);
**
** Because the %q format string is used, the '\'' character in zText
** is escaped and the SQL generated is as follows:
**
**      INSERT INTO table1 VALUES('It''s a happy day!')
**
** This is correct.  Had we used %s instead of %q, the generated SQL
** would have looked like this:
**
**      INSERT INTO table1 VALUES('It's a happy day!');
**
** 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.
*/
int sqlite3_exec_printf(
  sqlite*,                      /* An open database */
  const char *sqlFormat,        /* printf-style format string for the SQL */
  sqlite_callback,              /* Callback function */
  void *,                       /* 1st argument to callback function */
  char **errmsg,                /* Error msg written here */
  ...                           /* Arguments to the format string. */
);
int sqlite3_exec_vprintf(
  sqlite*,                      /* An open database */
  const char *sqlFormat,        /* printf-style format string for the SQL */
  sqlite_callback,              /* Callback function */
  void *,                       /* 1st argument to callback function */
  char **errmsg,                /* Error msg written here */
  va_list ap                    /* Arguments to the format string. */
);
int sqlite3_get_table_printf(
  sqlite*,               /* An open database */
  const char *sqlFormat, /* printf-style format string for the SQL */
  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 */
  ...                    /* Arguments to the format string */
);
int sqlite3_get_table_vprintf(
  sqlite*,               /* An open database */
  const char *sqlFormat, /* printf-style format string for the SQL */
  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 */
  va_list ap             /* Arguments to the format string */
);
char *sqlite3_mprintf(const char*,...);
char *sqlite3_vmprintf(const char*, va_list);

/*
** Windows systems should call this routine to free memory that
** is returned in the in the errmsg parameter of sqlite3_open() when
** SQLite is a DLL.  For some reason, it does not work to call free()
** directly.
*/
void sqlite3_freemem(void *p);

/*
** Windows systems need functions to call to return the sqlite3_version
** and sqlite3_encoding strings.
*/
const char *sqlite3_libversion(void);
const char *sqlite3_libencoding(void);

/*
** A pointer to the following structure is used to communicate with
** the implementations of user-defined functions.
*/
typedef struct sqlite_func sqlite_func;

/*
** Use the following routines to create new user-defined functions.  See
** the documentation for details.
*/
int sqlite3_create_function(
  sqlite*,                  /* Database where the new function is registered */
  const char *zName,        /* Name of the new function */
  int nArg,                 /* Number of arguments.  -1 means any number */
  void (*xFunc)(sqlite_func*,int,const char**),  /* C code to implement */
  void *pUserData           /* Available via the sqlite3_user_data() call */
);
int sqlite3_create_aggregate(
  sqlite*,                  /* Database where the new function is registered */
  const char *zName,        /* Name of the function */
  int nArg,                 /* Number of arguments */
  void (*xStep)(sqlite_func*,int,const char**), /* Called for each row */
  void (*xFinalize)(sqlite_func*),       /* Called once to get final result */
  void *pUserData           /* Available via the sqlite3_user_data() call */
);

/*
** Use the following routine to define the datatype returned by a
** user-defined function.  The second argument can be one of the
** constants SQLITE_NUMERIC, SQLITE_TEXT, or SQLITE_ARGS or it
** can be an integer greater than or equal to zero.  When the datatype
** parameter is non-negative, the type of the result will be the
** same as the datatype-th argument.  If datatype==SQLITE_NUMERIC
** then the result is always numeric.  If datatype==SQLITE_TEXT then
** the result is always text.  If datatype==SQLITE_ARGS then the result
** is numeric if any argument is numeric and is text otherwise.
*/
int sqlite3_function_type(
  sqlite *db,               /* The database there the function is registered */
  const char *zName,        /* Name of the function */
  int datatype              /* The datatype for this function */
);
#define SQLITE_NUMERIC     (-1)
#define SQLITE_TEXT        (-2)
#define SQLITE_ARGS        (-3)

/*
** The user function implementations call one of the following four routines
** in order to return their results.  The first parameter to each of these
** routines is a copy of the first argument to xFunc() or xFinialize().
** The second parameter to these routines is the result to be returned.
** A NULL can be passed as the second parameter to sqlite3_set_result_string()
** in order to return a NULL result.
**
** The 3rd argument to _string and _error is the number of characters to
** take from the string.  If this argument is negative, then all characters
** up to and including the first '\000' are used.
**
** The sqlite3_set_result_string() function allocates a buffer to hold the
** result and returns a pointer to this buffer.  The calling routine
** (that is, the implmentation of a user function) can alter the content
** of this buffer if desired.
*/
char *sqlite3_set_result_string(sqlite_func*,const char*,int);
void sqlite3_set_result_int(sqlite_func*,int);
void sqlite3_set_result_double(sqlite_func*,double);
void sqlite3_set_result_error(sqlite_func*,const char*,int);

/*
** The pUserData parameter to the sqlite3_create_function() and
** sqlite3_create_aggregate() routines used to register user functions
** is available to the implementation of the function using this
** call.
*/
void *sqlite3_user_data(sqlite_func*);

/*
** Aggregate functions use the following 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 be SQLite.
*/
void *sqlite3_aggregate_context(sqlite_func*, int nBytes);

/*
** The next routine returns the number of calls to xStep for a particular
** aggregate function instance.  The current call to xStep counts so this
** routine always returns at least 1.
*/
int sqlite3_aggregate_count(sqlite_func*);

/*
** This routine registers a callback with the SQLite library.  The
** callback is invoked (at compile-time, not at run-time) for each
** attempt to access a column of a table in the database.  The callback
** returns SQLITE_OK if access is allowed, SQLITE_DENY if the entire
** SQL statement should be aborted with an error and SQLITE_IGNORE
** if the column should be treated as a NULL value.
*/
int sqlite3_set_authorizer(
  sqlite*,
  int (*xAuth)(void*,int,const char*,const char*,const char*,const char*),
  void *pUserData
);

/*
** The second parameter to the access authorization function above will

** following constants:
*/
/* #define SQLITE_OK  0   // Allow access (This is actually defined above) */
#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 */

/*
** Register a function that is called at every invocation of sqlite3_exec()
** or sqlite3_compile().  This function can be used (for example) to generate
** a log file of all SQL executed against a database.
*/
void *sqlite3_trace(sqlite*, void(*xTrace)(void*,const char*), void*);

/*** The Callback-Free API
** 
** The following routines implement a new way to access SQLite that does not
** involve the use of callbacks.
**
** An sqlite_vm is an opaque object that represents a single SQL statement
** that is ready to be executed.
*/
typedef struct sqlite_vm sqlite_vm;

/*
** To execute an SQLite query without the use of callbacks, you first have
** to compile the SQL using this routine.  The 1st parameter "db" is a pointer
** to an sqlite object obtained from sqlite3_open().  The 2nd parameter
** "zSql" is the text of the SQL to be compiled.   The remaining parameters
** are all outputs.
**
** *pzTail is made to point to the first character 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.
**
** *ppVm is left pointing to a "virtual machine" that can be used to execute
** the compiled statement.  Or if there is an error, *ppVm may be set to NULL.
** If the input text contained no SQL (if the input is and empty string or
** a comment) then *ppVm is set to NULL.
**
** If any errors are detected during compilation, an error message is written
** into space obtained from malloc() and *pzErrMsg is made to point to that
** error message.  The calling routine is responsible for freeing the text
** of this message when it has finished with it.  Use sqlite3_freemem() to
** free the message.  pzErrMsg may be NULL in which case no error message
** will be generated.
**
** On success, SQLITE_OK is returned.  Otherwise and error code is returned.
*/
int sqlite3_compile(
  sqlite *db,                   /* The open database */
  const char *zSql,             /* SQL statement to be compiled */
  const char **pzTail,          /* OUT: uncompiled tail of zSql */
  sqlite_vm **ppVm,             /* OUT: the virtual machine to execute zSql */
  char **pzErrmsg               /* OUT: Error message. */
);

/*
** After an SQL statement has been compiled, it is handed to this routine
** to be executed.  This routine executes the statement as far as it can
** go then returns.  The return value will be one of SQLITE_DONE,
** SQLITE_ERROR, SQLITE_BUSY, SQLITE_ROW, or SQLITE_MISUSE.
**
** SQLITE_DONE means that the execute of the SQL statement is complete
** an no errors have occurred.  sqlite3_step() should not be called again
** for the same virtual machine.  *pN is set to the number of columns in
** the result set and *pazColName is set to an array of strings that
** describe the column names and datatypes.  The name of the i-th column
** is (*pazColName)[i] and the datatype of the i-th column is
** (*pazColName)[i+*pN].  *pazValue is set to NULL.
**
** SQLITE_ERROR means that the virtual machine encountered a run-time
** error.  sqlite3_step() should not be called again for the same
** virtual machine.  *pN is set to 0 and *pazColName and *pazValue are set
** to NULL.  Use sqlite3_finalize() to obtain the specific error code
** and the error message text for the error.
**
** SQLITE_BUSY means that an attempt to open the database failed because
** another thread or process is holding a lock.  The calling routine
** can try again to open the database by calling sqlite3_step() again.
** The return code will only be SQLITE_BUSY if no busy handler is registered
** using the sqlite3_busy_handler() or sqlite3_busy_timeout() routines.  If
** a busy handler callback has been registered but returns 0, then this
** routine will return SQLITE_ERROR and sqltie_finalize() will return
** SQLITE_BUSY when it is called.
**
** SQLITE_ROW means that a single row of the result is now available.
** The data is contained in *pazValue.  The value of the i-th column is
** (*azValue)[i].  *pN and *pazColName are set as described in SQLITE_DONE.
** Invoke sqlite3_step() again to advance to the next row.
**
** SQLITE_MISUSE is returned if sqlite3_step() is called incorrectly.
** For example, if you call sqlite3_step() after the virtual machine
** has halted (after a prior call to sqlite3_step() has returned SQLITE_DONE)
** or if you call sqlite3_step() with an incorrectly initialized virtual
** machine or a virtual machine that has been deleted or that is associated
** with an sqlite structure that has been closed.
*/
int sqlite3_step(
  sqlite_vm *pVm,              /* The virtual machine to execute */
  int *pN,                     /* OUT: Number of columns in result */
  const char ***pazValue,      /* OUT: Column data */
  const char ***pazColName     /* OUT: Column names and datatypes */
);

/*
** This routine is called to delete a virtual machine after it has finished
** executing.  The return value is the result code.  SQLITE_OK is returned
** if the statement executed successfully and some other value is returned if
** there was any kind of error.  If an error occurred and pzErrMsg is not
** NULL, then an error message is written into memory obtained from malloc()
** and *pzErrMsg is made to point to that error message.  The calling routine
** should use sqlite3_freemem() to delete this message when it has finished
** with it.
**
** This routine can be called at any point during the execution of the
** 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 result code returned will be SQLITE_ABORT.
*/
int sqlite3_finalize(sqlite_vm*, char **pzErrMsg);

/*
** This routine deletes the virtual machine, writes any error message to
** *pzErrMsg and returns an SQLite return code in the same way as the
** sqlite3_finalize() function.
**
** Additionally, if ppVm is not NULL, *ppVm is left pointing to a new virtual
** machine loaded with the compiled version of the original query ready for
** execution.
**
** If sqlite3_reset() returns SQLITE_SCHEMA, then *ppVm is set to NULL.
**
******* THIS IS AN EXPERIMENTAL API AND IS SUBJECT TO CHANGE ******
*/
int sqlite3_reset(sqlite_vm*, char **pzErrMsg);

/*
** If the SQL that was handed to sqlite3_compile contains variables that
** are represeted in the SQL text by a question mark ('?').  This routine
** is used to assign values to those variables.
**
** The first parameter is a virtual machine obtained from sqlite3_compile().
** The 2nd "idx" parameter determines which variable in the SQL statement
** to bind the value to.  The left most '?' is 1.  The 3rd parameter is
** the value to assign to that variable.  The 4th parameter is the number
** of bytes in the value, including the terminating \000 for strings.
** Finally, the 5th "copy" parameter is TRUE if SQLite should make its
** own private copy of this value, or false if the space that the 3rd
** parameter points to will be unchanging and can be used directly by
** SQLite.
**
** Unbound variables are treated as having a value of NULL.  To explicitly
** set a variable to NULL, call this routine with the 3rd parameter as a
** NULL pointer.
**
** If the 4th "len" parameter is -1, then strlen() is used to find the
** length.
**
** This routine can only be called immediately after sqlite3_compile()
** or sqlite3_reset() and before any calls to sqlite3_step().
**
******* THIS IS AN EXPERIMENTAL API AND IS SUBJECT TO CHANGE ******
*/
int sqlite3_bind(sqlite_vm*, int idx, const char *value, int len, int copy);

/*
** 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 API 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 less than N opcodes being executed, then the progress callback is not
** invoked.
** 
** Calling this routine overwrites any previously installed progress callback.
** 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. If the
** query was part of a larger transaction, then the transaction is not rolled
** back and remains active. The sqlite3_exec() call returns SQLITE_ABORT. 
**
******* THIS IS AN EXPERIMENTAL API AND IS SUBJECT TO CHANGE ******
*/
void sqlite3_progress_handler(sqlite*, int, int(*)(void*), void*);

/*
** Register a callback function to be invoked whenever a new transaction
** is committed.  The pArg argument is passed through to the callback.
** callback.  If the callback 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.
**
******* THIS IS AN EXPERIMENTAL API AND IS SUBJECT TO CHANGE ******
*/
void *sqlite3_commit_hook(sqlite*, int(*)(void*), void*);

/*
** Open an encrypted SQLite database.  If pKey==0 or nKey==0, this routine
** is the same as sqlite3_open().
**
** The code to implement this API is not available in the public release
** of SQLite.
*/
sqlite *sqlite3_open_encrypted(
  const char *zFilename,   /* Name of the encrypted database */
  const void *pKey,        /* Pointer to the key */
  int nKey,                /* Number of bytes in the key */
  int *pErrcode,           /* Write error code here */
  char **pzErrmsg          /* Write error message here */
);

/*
** 2001 September 15
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.228 2004/05/10 10:34:52 danielk1977 Exp $
*/
#include "config.h"
#include "sqlite.h"
#include "hash.h"
#include "parse.h"
#include <stdio.h>
#include <stdlib.h>

# define sqlite3StrRealloc(X)
#endif

/*
** This variable gets set if malloc() ever fails.  After it gets set,
** the SQLite library shuts down permanently.
*/
extern int sqlite3_malloc_failed;

/*
** The following global variables are used for testing and debugging
** only.  They only work if MEMORY_DEBUG is defined.
*/
#ifdef MEMORY_DEBUG
extern int sqlite3_nMalloc;       /* Number of sqliteMalloc() calls */
extern int sqlite3_nFree;         /* Number of sqliteFree() calls */
extern int sqlite3_iMallocFail;   /* Fail sqliteMalloc() after this many calls */
#endif

/*
** Name of the master database table.  The master database table
** is a special table that holds the names and attributes of all
** user tables and indices.
*/

** insert statement.  Inserts on views do not affect its value.  Each
** trigger has its own context, so that lastRowid can be updated inside
** triggers as usual.  The previous value will be restored once the trigger
** exits.  Upon entering a before or instead of trigger, lastRowid is no
** longer (since after version 2.8.12) reset to -1.
**
** The sqlite.nChange does not count changes within triggers and keeps no
** context.  It is reset at start of sqlite3_exec.
** The sqlite.lsChange represents the number of changes made by the last
** insert, update, or delete statement.  It remains constant throughout the
** length of a statement and is then updated by OP_SetCounts.  It keeps a
** context stack just like lastRowid so that the count of changes
** within a trigger is not seen outside the trigger.  Changes to views do not
** affect the value of lsChange.
** The sqlite.csChange keeps track of the number of current changes (since

int sqlite3FixInit(DbFixer*, Parse*, int, const char*, const Token*);
int sqlite3FixSrcList(DbFixer*, SrcList*);
int sqlite3FixSelect(DbFixer*, Select*);
int sqlite3FixExpr(DbFixer*, Expr*);
int sqlite3FixExprList(DbFixer*, ExprList*);
int sqlite3FixTriggerStep(DbFixer*, TriggerStep*);
double sqlite3AtoF(const char *z, const char **);
char *sqlite3_snprintf(int,char*,const char*,...);
int sqlite3FitsIn32Bits(const char *);

unsigned char *sqlite3utf16to8(const void *pData, int N);
void *sqlite3utf8to16be(const unsigned char *pIn, int N);
void *sqlite3utf8to16le(const unsigned char *pIn, int N);
void sqlite3utf16to16le(void *pData, int N);
void sqlite3utf16to16be(void *pData, int N);
int sqlite3PutVarint(unsigned char *, u64);
int sqlite3GetVarint(const unsigned char *, u64 *);
int sqlite3VarintLen(u64 v);

/*
** 2001 September 15
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains the sqlite3_get_table() and sqlite3_free_table()
** interface routines.  These are just wrappers around the main
** interface routine of sqlite3_exec().
**
** These routines are in a separate files so that they will not be linked
** if they are not used.
*/
#include <stdlib.h>
#include <string.h>
#include "sqliteInt.h"

/*
** This structure is used to pass data from sqlite3_get_table() through
** to the callback function is uses to build the result.
*/
typedef struct TabResult {
  char **azResult;
  char *zErrMsg;
  int nResult;
  int nAlloc;
  int nRow;
  int nColumn;
  int nData;
  int rc;
} TabResult;

/*
** This routine is called once for each row in the result table.  Its job
** is to fill in the TabResult structure appropriately, allocating new
** memory as necessary.
*/
static int sqlite3_get_table_cb(void *pArg, int nCol, char **argv, char **colv){
  TabResult *p = (TabResult*)pArg;
  int need;
  int i;
  char *z;

  /* Make sure there is enough space in p->azResult to hold everything
  ** we need to remember from this invocation of the callback.

        }
        strcpy(z, colv[i]);
      }
      p->azResult[p->nData++] = z;
    }
  }else if( p->nColumn!=nCol ){
    sqlite3SetString(&p->zErrMsg,
       "sqlite3_get_table() called with two or more incompatible queries",
       (char*)0);
    p->rc = SQLITE_ERROR;
    return 1;
  }

  /* Copy over the row data
  */

/*
** Query the database.  But instead of invoking a callback for each row,
** malloc() for space to hold the result and return the entire results
** at the conclusion of the call.
**
** The result that is written to ***pazResult is held in memory obtained
** from malloc().  But the caller cannot free this memory directly.  
** Instead, the entire table should be passed to sqlite3_free_table() when
** the calling procedure is finished using it.
*/
int sqlite3_get_table(
  sqlite *db,                 /* The database on which the SQL executes */
  const char *zSql,           /* The SQL to be executed */
  char ***pazResult,          /* Write the result table here */
  int *pnRow,                 /* Write the number of rows in the result here */
  int *pnColumn,              /* Write the number of columns of result here */
  char **pzErrMsg             /* Write error messages here */
){

  res.nAlloc = 20;
  res.rc = SQLITE_OK;
  res.azResult = malloc( sizeof(char*)*res.nAlloc );
  if( res.azResult==0 ){
    return SQLITE_NOMEM;
  }
  res.azResult[0] = 0;
  rc = sqlite3_exec(db, zSql, sqlite3_get_table_cb, &res, pzErrMsg);
  if( res.azResult ){
    res.azResult[0] = (char*)res.nData;
  }
  if( rc==SQLITE_ABORT ){
    sqlite3_free_table(&res.azResult[1]);
    if( res.zErrMsg ){
      if( pzErrMsg ){
        free(*pzErrMsg);
        *pzErrMsg = res.zErrMsg;
        sqlite3StrRealloc(pzErrMsg);
      }else{
        sqliteFree(res.zErrMsg);
      }
    }
    return res.rc;
  }
  sqliteFree(res.zErrMsg);
  if( rc!=SQLITE_OK ){
    sqlite3_free_table(&res.azResult[1]);
    return rc;
  }
  if( res.nAlloc>res.nData ){
    char **azNew;
    azNew = realloc( res.azResult, sizeof(char*)*(res.nData+1) );
    if( azNew==0 ){
      sqlite3_free_table(&res.azResult[1]);
      return SQLITE_NOMEM;
    }
    res.nAlloc = res.nData+1;
    res.azResult = azNew;
  }
  *pazResult = &res.azResult[1];
  if( pnColumn ) *pnColumn = res.nColumn;
  if( pnRow ) *pnRow = res.nRow;
  return rc;
}

/*
** This routine frees the space the sqlite3_get_table() malloced.
*/
void sqlite3_free_table(
  char **azResult             /* Result returned from from sqlite3_get_table() */
){
  if( azResult ){
    int i, n;
    azResult--;
    if( azResult==0 ) return;
    n = (int)azResult[0];
    for(i=1; i<n; i++){ if( azResult[i] ) free(azResult[i]); }
    free(azResult);
  }
}

/*
** 2001 September 15
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** A TCL Interface to SQLite
**
** $Id: tclsqlite.c,v 1.64 2004/05/10 10:34:53 danielk1977 Exp $
*/
#ifndef NO_TCL     /* Omit this whole file if TCL is unavailable */

#include "sqliteInt.h"
#include "tcl.h"
#include <stdlib.h>
#include <string.h>

  Tcl_Interp *interp;   /* The interpreter used for this database */
  char *zBusy;          /* The busy callback routine */
  char *zCommit;        /* The commit hook callback routine */
  char *zTrace;         /* The trace callback routine */
  char *zProgress;      /* The progress callback routine */
  char *zAuth;          /* The authorization callback routine */
  SqlFunc *pFunc;       /* List of SQL functions */
  int rc;               /* Return code of most recent sqlite3_exec() */
};

/*
** An instance of this structure passes information thru the sqlite
** logic from the original TCL command into the callback routine.
*/
typedef struct CallbackData CallbackData;

  int i, rc;
  if( azCol==0 || (cbData->once && cbData->zArray[0]) ){
    Tcl_SetVar2(cbData->interp, cbData->zArray, "*", "", 0);
    for(i=0; i<nCol; i++){
      Tcl_SetVar2(cbData->interp, cbData->zArray, "*", azN[i],
         TCL_LIST_ELEMENT|TCL_APPEND_VALUE);
      if( azN[nCol] ){
        char *z = sqlite3_mprintf("typeof:%s", azN[i]);
        Tcl_SetVar2(cbData->interp, cbData->zArray, z, azN[i+nCol],
           TCL_LIST_ELEMENT|TCL_APPEND_VALUE);
        sqlite3_freemem(z);
      }
    }
    cbData->once = 0;
  }
  if( azCol!=0 ){
    if( cbData->zArray[0] ){
      for(i=0; i<nCol; i++){

}

/*
** Called when the command is deleted.
*/
static void DbDeleteCmd(void *db){
  SqliteDb *pDb = (SqliteDb*)db;
  sqlite3_close(pDb->db);
  while( pDb->pFunc ){
    SqlFunc *pFunc = pDb->pFunc;
    pDb->pFunc = pFunc->pNext;
    Tcl_Free((char*)pFunc);
  }
  if( pDb->zBusy ){
    Tcl_Free(pDb->zBusy);

}

/*
** This routine is called to evaluate an SQL function implemented
** using TCL script.
*/
static void tclSqlFunc(sqlite_func *context, int argc, const char **argv){
  SqlFunc *p = sqlite3_user_data(context);
  Tcl_DString cmd;
  int i;
  int rc;

  Tcl_DStringInit(&cmd);
  Tcl_DStringAppend(&cmd, p->zScript, -1);
  for(i=0; i<argc; i++){
    Tcl_DStringAppendElement(&cmd, argv[i] ? argv[i] : "");
  }
  rc = Tcl_Eval(p->interp, Tcl_DStringValue(&cmd));
  if( rc ){
    sqlite3_set_result_error(context, Tcl_GetStringResult(p->interp), -1); 
  }else{
    sqlite3_set_result_string(context, Tcl_GetStringResult(p->interp), -1);
  }
}
#ifndef SQLITE_OMIT_AUTHORIZATION
/*
** This is the authentication function.  It appends the authentication
** type code and the two arguments to zCmd[] then invokes the result
** on the interpreter.  The reply is examined to determine if the

        strcpy(pDb->zAuth, zAuth);
      }else{
        pDb->zAuth = 0;
      }
#ifndef SQLITE_OMIT_AUTHORIZATION
      if( pDb->zAuth ){
        pDb->interp = interp;
        sqlite3_set_authorizer(pDb->db, auth_callback, pDb);
      }else{
        sqlite3_set_authorizer(pDb->db, 0, 0);
      }
#endif
    }
    break;
  }

  /*    $db busy ?CALLBACK?

        pDb->zBusy = Tcl_Alloc( len + 1 );
        strcpy(pDb->zBusy, zBusy);
      }else{
        pDb->zBusy = 0;
      }
      if( pDb->zBusy ){
        pDb->interp = interp;
        sqlite3_busy_handler(pDb->db, DbBusyHandler, pDb);
      }else{
        sqlite3_busy_handler(pDb->db, 0, 0);
      }
    }
    break;
  }

  /*    $db progress ?N CALLBACK?
  ** 

        strcpy(pDb->zProgress, zProgress);
      }else{
        pDb->zProgress = 0;
      }
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
      if( pDb->zProgress ){
        pDb->interp = interp;
        sqlite3_progress_handler(pDb->db, N, DbProgressHandler, pDb);
      }else{
        sqlite3_progress_handler(pDb->db, 0, 0, 0);
      }
#endif
    }else{
      Tcl_WrongNumArgs(interp, 2, objv, "N CALLBACK");
      return TCL_ERROR;
    }
    break;

  case DB_CHANGES: {
    Tcl_Obj *pResult;
    int nChange;
    if( objc!=2 ){
      Tcl_WrongNumArgs(interp, 2, objv, "");
      return TCL_ERROR;
    }
    nChange = sqlite3_changes(pDb->db);
    pResult = Tcl_GetObjResult(interp);
    Tcl_SetIntObj(pResult, nChange);
    break;
  }

  /*
  **     $db last_statement_changes
  **
  ** Return the number of rows that were modified, inserted, or deleted by
  ** the last statment to complete execution (excluding changes due to
  ** triggers)
  */
  case DB_LAST_STATEMENT_CHANGES: {
    Tcl_Obj *pResult;
    int lsChange;
    if( objc!=2 ){
      Tcl_WrongNumArgs(interp, 2, objv, "");
      return TCL_ERROR;
    }
    lsChange = sqlite3_last_statement_changes(pDb->db);
    pResult = Tcl_GetObjResult(interp);
    Tcl_SetIntObj(pResult, lsChange);
    break;
  }

  /*    $db close
  **

        pDb->zCommit = Tcl_Alloc( len + 1 );
        strcpy(pDb->zCommit, zCommit);
      }else{
        pDb->zCommit = 0;
      }
      if( pDb->zCommit ){
        pDb->interp = interp;
        sqlite3_commit_hook(pDb->db, DbCommitHandler, pDb);
      }else{
        sqlite3_commit_hook(pDb->db, 0, 0);
      }
    }
    break;
  }

  /*    $db complete SQL
  **
  ** Return TRUE if SQL is a complete SQL statement.  Return FALSE if
  ** additional lines of input are needed.  This is similar to the
  ** built-in "info complete" command of Tcl.
  */
  case DB_COMPLETE: {
    Tcl_Obj *pResult;
    int isComplete;
    if( objc!=3 ){
      Tcl_WrongNumArgs(interp, 2, objv, "SQL");
      return TCL_ERROR;
    }
    isComplete = sqlite3_complete( Tcl_GetStringFromObj(objv[2], 0) );
    pResult = Tcl_GetObjResult(interp);
    Tcl_SetBooleanObj(pResult, isComplete);
    break;
  }

  /*
  **    $db errorcode
  **
  ** Return the numeric error code that was returned by the most recent
  ** call to sqlite3_exec().
  */
  case DB_ERRORCODE: {
    Tcl_SetObjResult(interp, Tcl_NewIntObj(pDb->rc));
    break;
  }
   
  /*

      cbData.pCode = objv[4];
      cbData.tcl_rc = TCL_OK;
      cbData.nColName = 0;
      cbData.azColName = 0;
      zErrMsg = 0;
      Tcl_IncrRefCount(objv[3]);
      Tcl_IncrRefCount(objv[4]);
      rc = sqlite3_exec(pDb->db, zSql, DbEvalCallback, &cbData, &zErrMsg);
      Tcl_DecrRefCount(objv[4]);
      Tcl_DecrRefCount(objv[3]);
      if( cbData.tcl_rc==TCL_BREAK ){ cbData.tcl_rc = TCL_OK; }
    }else{
      Tcl_Obj *pList = Tcl_NewObj();
      cbData.tcl_rc = TCL_OK;
      rc = sqlite3_exec(pDb->db, zSql, DbEvalCallback2, pList, &zErrMsg);
      Tcl_SetObjResult(interp, pList);
    }
    pDb->rc = rc;
    if( rc==SQLITE_ABORT ){
      if( zErrMsg ) free(zErrMsg);
      rc = cbData.tcl_rc;
    }else if( zErrMsg ){
      Tcl_SetResult(interp, zErrMsg, TCL_VOLATILE);
      free(zErrMsg);
      rc = TCL_ERROR;
    }else if( rc!=SQLITE_OK ){
      Tcl_AppendResult(interp, sqlite3_error_string(rc), 0);
      rc = TCL_ERROR;
    }else{
    }
    Tcl_DecrRefCount(objv[2]);
#ifdef UTF_TRANSLATION_NEEDED
    Tcl_DStringFree(&dSql);
    if( objc==5 && cbData.azColName ){

    zScript = Tcl_GetStringFromObj(objv[3], &nScript);
    pFunc = (SqlFunc*)Tcl_Alloc( sizeof(*pFunc) + nScript + 1 );
    if( pFunc==0 ) return TCL_ERROR;
    pFunc->interp = interp;
    pFunc->pNext = pDb->pFunc;
    pFunc->zScript = (char*)&pFunc[1];
    strcpy(pFunc->zScript, zScript);
    sqlite3_create_function(pDb->db, zName, -1, tclSqlFunc, pFunc);
    sqlite3_function_type(pDb->db, zName, SQLITE_NUMERIC);
    break;
  }

  /*
  **     $db last_insert_rowid 
  **
  ** Return an integer which is the ROWID for the most recent insert.
  */
  case DB_LAST_INSERT_ROWID: {
    Tcl_Obj *pResult;
    int rowid;
    if( objc!=2 ){
      Tcl_WrongNumArgs(interp, 2, objv, "");
      return TCL_ERROR;
    }
    rowid = sqlite3_last_insert_rowid(pDb->db);
    pResult = Tcl_GetObjResult(interp);
    Tcl_SetIntObj(pResult, rowid);
    break;
  }

  /*
  **     $db onecolumn SQL
  **
  ** Return a single column from a single row of the given SQL query.
  */
  case DB_ONECOLUMN: {
    char *zSql;
    char *zErrMsg = 0;
    if( objc!=3 ){
      Tcl_WrongNumArgs(interp, 2, objv, "SQL");
      return TCL_ERROR;
    }
    zSql = Tcl_GetStringFromObj(objv[2], 0);
    rc = sqlite3_exec(pDb->db, zSql, DbEvalCallback3, interp, &zErrMsg);
    if( rc==SQLITE_ABORT ){
      rc = SQLITE_OK;
    }else if( zErrMsg ){
      Tcl_SetResult(interp, zErrMsg, TCL_VOLATILE);
      free(zErrMsg);
      rc = TCL_ERROR;
    }else if( rc!=SQLITE_OK ){
      Tcl_AppendResult(interp, sqlite3_error_string(rc), 0);
      rc = TCL_ERROR;
    }
    break;
  }

  /*
  **     $db rekey KEY

      Tcl_WrongNumArgs(interp, 2, objv, "KEY");
      return TCL_ERROR;
    }
    pKey = Tcl_GetByteArrayFromObj(objv[2], &nKey);
#ifdef SQLITE_HAS_CODEC
    rc = sqlite_rekey(pDb->db, pKey, nKey);
    if( rc ){
      Tcl_AppendResult(interp, sqlite3_error_string(rc), 0);
      rc = TCL_ERROR;
    }
#endif
    break;
  }

  /*
  **     $db timeout MILLESECONDS
  **
  ** Delay for the number of milliseconds specified when a file is locked.
  */
  case DB_TIMEOUT: {
    int ms;
    if( objc!=3 ){
      Tcl_WrongNumArgs(interp, 2, objv, "MILLISECONDS");
      return TCL_ERROR;
    }
    if( Tcl_GetIntFromObj(interp, objv[2], &ms) ) return TCL_ERROR;
    sqlite3_busy_timeout(pDb->db, ms);
    break;
  }

  /*    $db trace ?CALLBACK?
  **
  ** Make arrangements to invoke the CALLBACK routine for each SQL statement
  ** that is executed.  The text of the SQL is appended to CALLBACK before

        pDb->zTrace = Tcl_Alloc( len + 1 );
        strcpy(pDb->zTrace, zTrace);
      }else{
        pDb->zTrace = 0;
      }
      if( pDb->zTrace ){
        pDb->interp = interp;
        sqlite3_trace(pDb->db, DbTraceHandler, pDb);
      }else{
        sqlite3_trace(pDb->db, 0, 0);
      }
    }
    break;
  }

  } /* End of the SWITCH statement */
  return rc;

  const char *zArg;
  char *zErrMsg;
  const char *zFile;
  char zBuf[80];
  if( objc==2 ){
    zArg = Tcl_GetStringFromObj(objv[1], 0);
    if( strcmp(zArg,"-encoding")==0 ){
      Tcl_AppendResult(interp,sqlite3_encoding,0);
      return TCL_OK;
    }
    if( strcmp(zArg,"-version")==0 ){
      Tcl_AppendResult(interp,sqlite3_version,0);
      return TCL_OK;
    }
    if( strcmp(zArg,"-has-codec")==0 ){
#ifdef SQLITE_HAS_CODEC
      Tcl_AppendResult(interp,"1",0);
#else
      Tcl_AppendResult(interp,"0",0);

  if( p==0 ){
    Tcl_SetResult(interp, "malloc failed", TCL_STATIC);
    return TCL_ERROR;
  }
  memset(p, 0, sizeof(*p));
  zFile = Tcl_GetStringFromObj(objv[2], 0);
#ifdef SQLITE_HAS_CODEC
  p->db = sqlite3_open_encrypted(zFile, pKey, nKey, 0, &zErrMsg);
#else
  p->db = sqlite3_open(zFile, mode, &zErrMsg);
#endif
  if( p->db==0 ){
    Tcl_SetResult(interp, zErrMsg, TCL_VOLATILE);
    Tcl_Free((char*)p);
    free(zErrMsg);
    return TCL_ERROR;
  }

**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing the printf() interface to SQLite.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test1.c,v 1.38 2004/05/10 10:34:53 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include "os.h"
#include <stdlib.h>
#include <string.h>

      return TCL_ERROR;
    }
  }
  return TCL_OK;
}

/*
** Usage:   sqlite3_open filename
**
** Returns:  The name of an open database.
*/
static int sqlite_test_open(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite *db;
  char *zErr = 0;
  char zBuf[100];
  if( argc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FILENAME\"", 0);
    return TCL_ERROR;
  }
  db = sqlite3_open(argv[1], 0666, &zErr);
  if( db==0 ){
    Tcl_AppendResult(interp, zErr, 0);
    free(zErr);
    return TCL_ERROR;
  }
  if( makePointerStr(interp, zBuf, db) ) return TCL_ERROR;
  Tcl_AppendResult(interp, zBuf, 0);
  return TCL_OK;
}

/*
** The callback routine for sqlite3_exec_printf().
*/
static int exec_printf_cb(void *pArg, int argc, char **argv, char **name){
  Tcl_DString *str = (Tcl_DString*)pArg;
  int i;

  if( Tcl_DStringLength(str)==0 ){
    for(i=0; i<argc; i++){
      Tcl_DStringAppendElement(str, name[i] ? name[i] : "NULL");
    }
  }
  for(i=0; i<argc; i++){
    Tcl_DStringAppendElement(str, argv[i] ? argv[i] : "NULL");
  }
  return 0;
}

/*
** Usage:  sqlite3_exec_printf  DB  FORMAT  STRING
**
** Invoke the sqlite3_exec_printf() interface using the open database
** DB.  The SQL is the string FORMAT.  The format string should contain
** one %s or %q.  STRING is the value inserted into %s or %q.
*/
static int test_exec_printf(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */

  if( argc!=4 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
       " DB FORMAT STRING", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  Tcl_DStringInit(&str);
  rc = sqlite3_exec_printf(db, argv[2], exec_printf_cb, &str, &zErr, argv[3]);
  sprintf(zBuf, "%d", rc);
  Tcl_AppendElement(interp, zBuf);
  Tcl_AppendElement(interp, rc==SQLITE_OK ? Tcl_DStringValue(&str) : zErr);
  Tcl_DStringFree(&str);
  if( zErr ) free(zErr);
  return TCL_OK;
}

/*
** Usage:  sqlite3_mprintf_z_test  SEPARATOR  ARG0  ARG1 ...
**
** Test the %z format of mprintf().  Use multiple mprintf() calls to 
** concatenate arg0 through argn using separator as the separator.
** Return the result.
*/
static int test_mprintf_z(
  void *NotUsed,

  }
  Tcl_AppendResult(interp, zResult, 0);
  sqliteFree(zResult);
  return TCL_OK;
}

/*
** Usage:  sqlite3_get_table_printf  DB  FORMAT  STRING
**
** Invoke the sqlite3_get_table_printf() interface using the open database
** DB.  The SQL is the string FORMAT.  The format string should contain
** one %s or %q.  STRING is the value inserted into %s or %q.
*/
static int test_get_table_printf(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */

  if( argc!=4 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
       " DB FORMAT STRING", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  Tcl_DStringInit(&str);
  rc = sqlite3_get_table_printf(db, argv[2], &aResult, &nRow, &nCol, 
               &zErr, argv[3]);
  sprintf(zBuf, "%d", rc);
  Tcl_AppendElement(interp, zBuf);
  if( rc==SQLITE_OK ){
    sprintf(zBuf, "%d", nRow);
    Tcl_AppendElement(interp, zBuf);
    sprintf(zBuf, "%d", nCol);
    Tcl_AppendElement(interp, zBuf);
    for(i=0; i<(nRow+1)*nCol; i++){
      Tcl_AppendElement(interp, aResult[i] ? aResult[i] : "NULL");
    }
  }else{
    Tcl_AppendElement(interp, zErr);
  }
  sqlite3_free_table(aResult);
  if( zErr ) free(zErr);
  return TCL_OK;
}


/*
** Usage:  sqlite3_last_insert_rowid DB
**
** Returns the integer ROWID of the most recent insert.
*/
static int test_last_rowid(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite *db;
  char zBuf[30];

  if( argc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " DB\"", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  sprintf(zBuf, "%d", sqlite3_last_insert_rowid(db));
  Tcl_AppendResult(interp, zBuf, 0);
  return SQLITE_OK;
}

/*
** Usage:  sqlite3_close DB
**
** Closes the database opened by sqlite3_open.
*/
static int sqlite_test_close(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite *db;
  if( argc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FILENAME\"", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  sqlite3_close(db);
  return TCL_OK;
}

/*
** Implementation of the x_coalesce() function.
** Return the first argument non-NULL argument.
*/
static void ifnullFunc(sqlite_func *context, int argc, const char **argv){
  int i;
  for(i=0; i<argc; i++){
    if( argv[i] ){
      sqlite3_set_result_string(context, argv[i], -1);
      break;
    }
  }
}

/*
** A structure into which to accumulate text.

      dstrAppend(p, argv[i], ' ');
    }
  }
  return 0;
}

/*
** Implementation of the x_sqlite3_exec() function.  This function takes
** a single argument and attempts to execute that argument as SQL code.
** This is illegal and should set the SQLITE_MISUSE flag on the database.
**
** 2004-Jan-07:  We have changed this to make it legal to call sqlite3_exec()
** from within a function call.  
** 
** This routine simulates the effect of having two threads attempt to
** use the same database at the same time.
*/
static void sqlite3ExecFunc(sqlite_func *context, int argc, const char **argv){
  struct dstr x;
  memset(&x, 0, sizeof(x));
  sqlite3_exec((sqlite*)sqlite3_user_data(context), argv[0], 
      execFuncCallback, &x, 0);
  sqlite3_set_result_string(context, x.z, x.nUsed);
  sqliteFree(x.z);
}

/*
** Usage:  sqlite_test_create_function DB
**
** Call the sqlite3_create_function API on the given database in order
** to create a function named "x_coalesce".  This function does the same thing
** as the "coalesce" function.  This function also registers an SQL function
** named "x_sqlite3_exec" that invokes sqlite3_exec().  Invoking sqlite3_exec()
** in this way is illegal recursion and should raise an SQLITE_MISUSE error.
** The effect is similar to trying to use the same database connection from
** two threads at the same time.
**
** The original motivation for this routine was to be able to call the
** sqlite3_create_function function while a query is in progress in order
** to test the SQLITE_MISUSE detection logic.
*/
static int test_create_function(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite *db;
  extern void Md5_Register(sqlite*);
  if( argc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FILENAME\"", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  sqlite3_create_function(db, "x_coalesce", -1, ifnullFunc, 0);
  sqlite3_create_function(db, "x_sqlite3_exec", 1, sqlite3ExecFunc, db);
  return TCL_OK;
}

/*
** Routines to implement the x_count() aggregate function.
*/
typedef struct CountCtx CountCtx;
struct CountCtx {
  int n;
};
static void countStep(sqlite_func *context, int argc, const char **argv){
  CountCtx *p;
  p = sqlite3_aggregate_context(context, sizeof(*p));
  if( (argc==0 || argv[0]) && p ){
    p->n++;
  }
}   
static void countFinalize(sqlite_func *context){
  CountCtx *p;
  p = sqlite3_aggregate_context(context, sizeof(*p));
  sqlite3_set_result_int(context, p ? p->n : 0);
}

/*
** Usage:  sqlite_test_create_aggregate DB
**
** Call the sqlite3_create_function API on the given database in order
** to create a function named "x_count".  This function does the same thing
** as the "md5sum" function.
**
** The original motivation for this routine was to be able to call the
** sqlite3_create_aggregate function while a query is in progress in order
** to test the SQLITE_MISUSE detection logic.
*/
static int test_create_aggregate(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite *db;
  if( argc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FILENAME\"", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  sqlite3_create_aggregate(db, "x_count", 0, countStep, countFinalize, 0);
  sqlite3_create_aggregate(db, "x_count", 1, countStep, countFinalize, 0);
  return TCL_OK;
}



/*
** Usage:  sqlite3_mprintf_int FORMAT INTEGER INTEGER INTEGER
**
** Call mprintf with three integer arguments
*/
static int sqlite3_mprintf_int(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  int a[3], i;
  char *z;
  if( argc!=5 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FORMAT INT INT INT\"", 0);
    return TCL_ERROR;
  }
  for(i=2; i<5; i++){
    if( Tcl_GetInt(interp, argv[i], &a[i-2]) ) return TCL_ERROR;
  }
  z = sqlite3_mprintf(argv[1], a[0], a[1], a[2]);
  Tcl_AppendResult(interp, z, 0);
  sqlite3_freemem(z);
  return TCL_OK;
}

/*
** Usage:  sqlite3_mprintf_str FORMAT INTEGER INTEGER STRING
**
** Call mprintf with two integer arguments and one string argument
*/
static int sqlite3_mprintf_str(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  int a[3], i;
  char *z;
  if( argc<4 || argc>5 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FORMAT INT INT ?STRING?\"", 0);
    return TCL_ERROR;
  }
  for(i=2; i<4; i++){
    if( Tcl_GetInt(interp, argv[i], &a[i-2]) ) return TCL_ERROR;
  }
  z = sqlite3_mprintf(argv[1], a[0], a[1], argc>4 ? argv[4] : NULL);
  Tcl_AppendResult(interp, z, 0);
  sqlite3_freemem(z);
  return TCL_OK;
}

/*
** Usage:  sqlite3_mprintf_str FORMAT INTEGER INTEGER DOUBLE
**
** Call mprintf with two integer arguments and one double argument
*/
static int sqlite3_mprintf_double(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  int a[3], i;
  double r;
  char *z;
  if( argc!=5 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FORMAT INT INT STRING\"", 0);
    return TCL_ERROR;
  }
  for(i=2; i<4; i++){
    if( Tcl_GetInt(interp, argv[i], &a[i-2]) ) return TCL_ERROR;
  }
  if( Tcl_GetDouble(interp, argv[4], &r) ) return TCL_ERROR;
  z = sqlite3_mprintf(argv[1], a[0], a[1], r);
  Tcl_AppendResult(interp, z, 0);
  sqlite3_freemem(z);
  return TCL_OK;
}

/*
** Usage:  sqlite3_mprintf_str FORMAT DOUBLE DOUBLE
**
** Call mprintf with a single double argument which is the product of the
** two arguments given above.  This is used to generate overflow and underflow
** doubles to test that they are converted properly.
*/
static int sqlite3_mprintf_scaled(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  int i;
  double r[2];
  char *z;
  if( argc!=4 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FORMAT DOUBLE DOUBLE\"", 0);
    return TCL_ERROR;
  }
  for(i=2; i<4; i++){
    if( Tcl_GetDouble(interp, argv[i], &r[i-2]) ) return TCL_ERROR;
  }
  z = sqlite3_mprintf(argv[1], r[0]*r[1]);
  Tcl_AppendResult(interp, z, 0);
  sqlite3_freemem(z);
  return TCL_OK;
}

/*
** Usage: sqlite_malloc_fail N
**
** Rig sqliteMalloc() to fail on the N-th call.  Turn off this mechanism
** and reset the sqlite3_malloc_failed variable is N==0.
*/
#ifdef MEMORY_DEBUG
static int sqlite_malloc_fail(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  int n;
  if( argc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " N\"", 0);
    return TCL_ERROR;
  }
  if( Tcl_GetInt(interp, argv[1], &n) ) return TCL_ERROR;
  sqlite3_iMallocFail = n;
  sqlite3_malloc_failed = 0;
  return TCL_OK;
}
#endif

/*
** Usage: sqlite_malloc_stat
**
** Return the number of prior calls to sqliteMalloc() and sqliteFree().
*/
#ifdef MEMORY_DEBUG
static int sqlite_malloc_stat(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  char zBuf[200];
  sprintf(zBuf, "%d %d %d", sqlite3_nMalloc, sqlite3_nFree, sqlite3_iMallocFail);
  Tcl_AppendResult(interp, zBuf, 0);
  return TCL_OK;
}
#endif

/*
** Usage:  sqlite_abort

/*
** The following routine is a user-defined SQL function whose purpose
** is to test the sqlite_set_result() API.
*/
static void testFunc(sqlite_func *context, int argc, const char **argv){
  while( argc>=2 ){
    if( argv[0]==0 ){
      sqlite3_set_result_error(context, "first argument to test function "
         "may not be NULL", -1);
    }else if( sqlite3StrICmp(argv[0],"string")==0 ){
      sqlite3_set_result_string(context, argv[1], -1);
    }else if( argv[1]==0 ){
      sqlite3_set_result_error(context, "2nd argument may not be NULL if the "
         "first argument is not \"string\"", -1);
    }else if( sqlite3StrICmp(argv[0],"int")==0 ){
      sqlite3_set_result_int(context, atoi(argv[1]));
    }else if( sqlite3StrICmp(argv[0],"double")==0 ){
      sqlite3_set_result_double(context, sqlite3AtoF(argv[1], 0));
    }else{
      sqlite3_set_result_error(context,"first argument should be one of: "
          "string int double", -1);
    }
    argc -= 2;
    argv += 2;
  }
}

  int rc;
  if( argc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
       " DB FUNCTION-NAME", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  rc = sqlite3_create_function(db, argv[2], -1, testFunc, 0);
  if( rc!=0 ){
    Tcl_AppendResult(interp, sqlite3_error_string(rc), 0);
    return TCL_ERROR;
  }
  return TCL_OK;
}

/*
** This SQLite callback records the datatype of all columns.

  int rc;
  if( argc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
       " DB SQL", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  rc = sqlite3_exec(db, argv[2], rememberDataTypes, interp, 0);
  if( rc!=0 && rc!=SQLITE_ABORT ){
    Tcl_AppendResult(interp, sqlite3_error_string(rc), 0);
    return TCL_ERROR;
  }
  return TCL_OK;
}

/*
** Usage:  sqlite3_compile  DB  SQL  ?TAILVAR?
**
** Attempt to compile an SQL statement.  Return a pointer to the virtual
** machine used to execute that statement.  Unprocessed SQL is written
** into TAILVAR.
*/
static int test_compile(
  void *NotUsed,

  char zBuf[50];
  if( argc!=3 && argc!=4 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
       " DB SQL TAILVAR", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  rc = sqlite3_compile(db, argv[2], argc==4 ? &zTail : 0, &vm, &zErr);
  if( argc==4 ) Tcl_SetVar(interp, argv[3], zTail, 0);
  if( rc ){
    assert( vm==0 );
    sprintf(zBuf, "(%d) ", rc);
    Tcl_AppendResult(interp, zBuf, zErr, 0);
    sqlite3_freemem(zErr);
    return TCL_ERROR;
  }
  if( vm ){
    if( makePointerStr(interp, zBuf, vm) ) return TCL_ERROR;
    Tcl_AppendResult(interp, zBuf, 0);
  }
  return TCL_OK;
}

/*
** Usage:  sqlite3_step  VM  ?NVAR?  ?VALUEVAR?  ?COLNAMEVAR?
**
** Step a virtual machine.  Return a the result code as a string.
** Column results are written into three variables.
*/
static int test_step(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */

  char zBuf[50];
  if( argc<2 || argc>5 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
       " VM NVAR VALUEVAR COLNAMEVAR", 0);
    return TCL_ERROR;
  }
  if( getVmPointer(interp, argv[1], &vm) ) return TCL_ERROR;
  rc = sqlite3_step(vm, argc>=3?&N:0, argc>=4?&azValue:0, argc==5?&azColName:0);
  if( argc>=3 ){
    sprintf(zBuf, "%d", N);
    Tcl_SetVar(interp, argv[2], zBuf, 0);
  }
  if( argc>=4 ){
    Tcl_SetVar(interp, argv[3], "", 0);
    if( azValue ){

    default:            zRc = "unknown";        break;
  }
  Tcl_AppendResult(interp, zRc, 0);
  return TCL_OK;
}

/*
** Usage:  sqlite3_finalize  VM 
**
** Shutdown a virtual machine.
*/
static int test_finalize(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite_vm *vm;
  int rc;
  char *zErrMsg = 0;
  if( argc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
       " VM\"", 0);
    return TCL_ERROR;
  }
  if( getVmPointer(interp, argv[1], &vm) ) return TCL_ERROR;
  rc = sqlite3_finalize(vm, &zErrMsg);
  if( rc ){
    char zBuf[50];
    sprintf(zBuf, "(%d) ", rc);
    Tcl_AppendResult(interp, zBuf, zErrMsg, 0);
    sqlite3_freemem(zErrMsg);
    return TCL_ERROR;
  }
  return TCL_OK;
}

/*
** Usage:  sqlite3_reset   VM 
**
** Reset a virtual machine and prepare it to be run again.
*/
static int test_reset(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite_vm *vm;
  int rc;
  char *zErrMsg = 0;
  if( argc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
       " VM\"", 0);
    return TCL_ERROR;
  }
  if( getVmPointer(interp, argv[1], &vm) ) return TCL_ERROR;
  rc = sqlite3_reset(vm, &zErrMsg);
  if( rc ){
    char zBuf[50];
    sprintf(zBuf, "(%d) ", rc);
    Tcl_AppendResult(interp, zBuf, zErrMsg, 0);
    sqlite3_freemem(zErrMsg);
    return TCL_ERROR;
  }
  return TCL_OK;
}

/*
** This is the "static_bind_value" that variables are bound to when
** the FLAG option of sqlite3_bind is "static"
*/
static char *sqlite_static_bind_value = 0;

/*
** Usage:  sqlite3_bind  VM  IDX  VALUE  FLAGS
**
** Sets the value of the IDX-th occurance of "?" in the original SQL
** string.  VALUE is the new value.  If FLAGS=="null" then VALUE is
** ignored and the value is set to NULL.  If FLAGS=="static" then
** the value is set to the value of a static variable named
** "sqlite_static_bind_value".  If FLAGS=="normal" then a copy
** of the VALUE is made.

    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
       " VM IDX VALUE (null|static|normal)\"", 0);
    return TCL_ERROR;
  }
  if( getVmPointer(interp, argv[1], &vm) ) return TCL_ERROR;
  if( Tcl_GetInt(interp, argv[2], &idx) ) return TCL_ERROR;
  if( strcmp(argv[4],"null")==0 ){
    rc = sqlite3_bind(vm, idx, 0, 0, 0);
  }else if( strcmp(argv[4],"static")==0 ){
    rc = sqlite3_bind(vm, idx, sqlite_static_bind_value, -1, 0);
  }else if( strcmp(argv[4],"normal")==0 ){
    rc = sqlite3_bind(vm, idx, argv[3], -1, 1);
  }else{
    Tcl_AppendResult(interp, "4th argument should be "
        "\"null\" or \"static\" or \"normal\"", 0);
    return TCL_ERROR;
  }
  if( rc ){
    char zBuf[50];
    sprintf(zBuf, "(%d) ", rc);
    Tcl_AppendResult(interp, zBuf, sqlite3_error_string(rc), 0);
    return TCL_ERROR;
  }
  return TCL_OK;
}

/*
** Usage:    breakpoint

  return TCL_OK;         /* Do nothing */
}

/*
** Register commands with the TCL interpreter.
*/
int Sqlitetest1_Init(Tcl_Interp *interp){
  extern int sqlite3_search_count;
  extern int sqlite3_interrupt_count;
  extern int sqlite3_open_file_count;
  extern int sqlite3_current_time;
  static struct {
     char *zName;
     Tcl_CmdProc *xProc;
  } aCmd[] = {
     { "sqlite3_mprintf_int",             (Tcl_CmdProc*)sqlite3_mprintf_int    },
     { "sqlite3_mprintf_str",             (Tcl_CmdProc*)sqlite3_mprintf_str    },
     { "sqlite3_mprintf_double",          (Tcl_CmdProc*)sqlite3_mprintf_double },
     { "sqlite3_mprintf_scaled",          (Tcl_CmdProc*)sqlite3_mprintf_scaled },
     { "sqlite3_mprintf_z_test",          (Tcl_CmdProc*)test_mprintf_z        },
     { "sqlite3_open",                    (Tcl_CmdProc*)sqlite_test_open      },
     { "sqlite3_last_insert_rowid",       (Tcl_CmdProc*)test_last_rowid       },
     { "sqlite3_exec_printf",             (Tcl_CmdProc*)test_exec_printf      },
     { "sqlite3_get_table_printf",        (Tcl_CmdProc*)test_get_table_printf },
     { "sqlite3_close",                   (Tcl_CmdProc*)sqlite_test_close     },
     { "sqlite3_create_function",         (Tcl_CmdProc*)test_create_function  },
     { "sqlite3_create_aggregate",        (Tcl_CmdProc*)test_create_aggregate },
     { "sqlite_register_test_function",  (Tcl_CmdProc*)test_register_func    },
     { "sqlite_abort",                   (Tcl_CmdProc*)sqlite_abort          },
     { "sqlite_datatypes",               (Tcl_CmdProc*)sqlite_datatypes      },
#ifdef MEMORY_DEBUG
     { "sqlite_malloc_fail",             (Tcl_CmdProc*)sqlite_malloc_fail    },
     { "sqlite_malloc_stat",             (Tcl_CmdProc*)sqlite_malloc_stat    },
#endif
     { "sqlite3_compile",                 (Tcl_CmdProc*)test_compile          },
     { "sqlite3_step",                    (Tcl_CmdProc*)test_step             },
     { "sqlite3_finalize",                (Tcl_CmdProc*)test_finalize         },
     { "sqlite3_bind",                    (Tcl_CmdProc*)test_bind             },
     { "sqlite3_reset",                   (Tcl_CmdProc*)test_reset            },
     { "breakpoint",                     (Tcl_CmdProc*)test_breakpoint       },
  };
  int i;

  for(i=0; i<sizeof(aCmd)/sizeof(aCmd[0]); i++){
    Tcl_CreateCommand(interp, aCmd[i].zName, aCmd[i].xProc, 0, 0);
  }
  Tcl_LinkVar(interp, "sqlite3_search_count", 
      (char*)&sqlite3_search_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite3_interrupt_count", 
      (char*)&sqlite3_interrupt_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite3_open_file_count", 
      (char*)&sqlite3_open_file_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite3_current_time", 
      (char*)&sqlite3_current_time, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_static_bind_value",
      (char*)&sqlite_static_bind_value, TCL_LINK_STRING);
  return TCL_OK;
}

**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing the pager.c module in SQLite.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test2.c,v 1.19 2004/05/10 10:34:53 danielk1977 Exp $
*/
#include "os.h"
#include "sqliteInt.h"
#include "pager.h"
#include "tcl.h"
#include <stdlib.h>
#include <string.h>

  return TCL_OK;
}

/*
** Register commands with the TCL interpreter.
*/
int Sqlitetest2_Init(Tcl_Interp *interp){
  extern int sqlite3_io_error_pending;
  char zBuf[100];
  static struct {
    char *zName;
    Tcl_CmdProc *xProc;
  } aCmd[] = {
    { "pager_open",              (Tcl_CmdProc*)pager_open          },
    { "pager_close",             (Tcl_CmdProc*)pager_close         },

    { "page_number",             (Tcl_CmdProc*)page_number         },
    { "fake_big_file",           (Tcl_CmdProc*)fake_big_file       },
  };
  int i;
  for(i=0; i<sizeof(aCmd)/sizeof(aCmd[0]); i++){
    Tcl_CreateCommand(interp, aCmd[i].zName, aCmd[i].xProc, 0, 0);
  }
  Tcl_LinkVar(interp, "sqlite3_io_error_pending",
     (char*)&sqlite3_io_error_pending, TCL_LINK_INT);
#ifdef SQLITE_TEST
  {
    extern int journal_format;
    Tcl_LinkVar(interp, "journal_format",
       (char*)&journal_format, TCL_LINK_INT);
  }
#endif

/*
** 2003 December 18
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing the the SQLite library in a multithreaded environment.
**
** $Id: test4.c,v 1.5 2004/05/10 10:34:53 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#if defined(OS_UNIX) && OS_UNIX==1 && defined(THREADSAFE) && THREADSAFE==1
#include <stdlib.h>
#include <string.h>
#include <pthread.h>

/*
** The main loop for a thread.  Threads use busy waiting. 
*/
static void *thread_main(void *pArg){
  Thread *p = (Thread*)pArg;
  if( p->db ){
    sqlite3_close(p->db);
  }
  p->db = sqlite3_open(p->zFilename, 0, &p->zErr);
  p->vm = 0;
  p->completed = 1;
  while( p->opnum<=p->completed ) sched_yield();
  while( p->xOp ){
    if( p->zErr && p->zErr!=p->zStaticErr ){
      sqlite3_freemem(p->zErr);
      p->zErr = 0;
    }
    (*p->xOp)(p);
    p->completed++;
    while( p->opnum<=p->completed ) sched_yield();
  }
  if( p->vm ){
    sqlite3_finalize(p->vm, 0);
    p->vm = 0;
  }
  if( p->db ){
    sqlite3_close(p->db);
    p->db = 0;
  }
  if( p->zErr && p->zErr!=p->zStaticErr ){
    sqlite3_freemem(p->zErr);
    p->zErr = 0;
  }
  p->completed++;
  return 0;
}

/*

static void do_compile(Thread *p){
  if( p->db==0 ){
    p->zErr = p->zStaticErr = "no database is open";
    p->rc = SQLITE_ERROR;
    return;
  }
  if( p->vm ){
    sqlite3_finalize(p->vm, 0);
    p->vm = 0;
  }
  p->rc = sqlite3_compile(p->db, p->zArg, 0, &p->vm, &p->zErr);
}

/*
** Usage: thread_compile ID SQL
**
** Compile a new virtual machine.
*/

*/
static void do_step(Thread *p){
  if( p->vm==0 ){
    p->zErr = p->zStaticErr = "no virtual machine available";
    p->rc = SQLITE_ERROR;
    return;
  }
  p->rc = sqlite3_step(p->vm, &p->argc, &p->argv, &p->colv);
}

/*
** Usage: thread_step ID
**
** Advance the virtual machine by one step
*/

*/
static void do_finalize(Thread *p){
  if( p->vm==0 ){
    p->zErr = p->zStaticErr = "no virtual machine available";
    p->rc = SQLITE_ERROR;
    return;
  }
  p->rc = sqlite3_finalize(p->vm, &p->zErr);
  p->vm = 0;
}

/*
** Usage: thread_finalize ID
**
** Finalize the virtual machine.

*************************************************************************
** An tokenizer for SQL
**
** This file contains C code that splits an SQL input string up into
** individual tokens and sends those tokens one-by-one over to the
** parser for analysis.
**
** $Id: tokenize.c,v 1.70 2004/05/10 10:34:53 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include <stdlib.h>

/*

  pEngine = sqlite3ParserAlloc((void*(*)(int))malloc);
  if( pEngine==0 ){
    sqlite3SetString(pzErrMsg, "out of memory", (char*)0);
    return 1;
  }
  pParse->sLastToken.dyn = 0;
  pParse->zTail = zSql;
  while( sqlite3_malloc_failed==0 && zSql[i]!=0 ){
    assert( i>=0 );
    pParse->sLastToken.z = &zSql[i];
    assert( pParse->sLastToken.dyn==0 );
    pParse->sLastToken.n = sqliteGetToken((unsigned char*)&zSql[i], &tokenType);
    i += pParse->sLastToken.n;
    switch( tokenType ){
      case TK_SPACE:

      sqlite3Parser(pEngine, TK_SEMI, pParse->sLastToken, pParse);
      pParse->zTail = &zSql[i];
    }
    sqlite3Parser(pEngine, 0, pParse->sLastToken, pParse);
  }
  sqlite3ParserFree(pEngine, free);
  if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){
    sqlite3SetString(&pParse->zErrMsg, sqlite3_error_string(pParse->rc),
                    (char*)0);
  }
  if( pParse->zErrMsg ){
    if( pzErrMsg && *pzErrMsg==0 ){
      *pzErrMsg = pParse->zErrMsg;
    }else{
      sqliteFree(pParse->zErrMsg);

  if( nErr>0 && (pParse->rc==SQLITE_OK || pParse->rc==SQLITE_DONE) ){
    pParse->rc = SQLITE_ERROR;
  }
  return nErr;
}

/*
** Token types used by the sqlite3_complete() routine.  See the header
** comments on that procedure for additional information.
*/
#define tkEXPLAIN 0
#define tkCREATE  1
#define tkTEMP    2
#define tkTRIGGER 3
#define tkEND     4

**   (4) tkEND       The "end" keyword.
**   (5) tkSEMI      A semicolon.
**   (6) tkWS        Whitespace
**   (7) tkOTHER     Any other SQL token.
**
** Whitespace never causes a state transition and is always ignored.
*/
int sqlite3_complete(const char *zSql){
  u8 state = 0;   /* Current state, using numbers defined in header comment */
  u8 token;       /* Value of the next token */

  /* The following matrix defines the transition from one state to another
  ** according to what token is seen.  trans[state][token] returns the
  ** next state.
  */

  /* Check that: 
  ** 1. the trigger name does not already exist.
  ** 2. the table (or view) does exist in the same database as the trigger.
  ** 3. that we are not trying to create a trigger on the sqlite_master table
  ** 4. That we are not trying to create an INSTEAD OF trigger on a table.
  ** 5. That we are not trying to create a BEFORE or AFTER trigger on a view.
  */
  if( sqlite3_malloc_failed ) goto trigger_cleanup;
  assert( pTableName->nSrc==1 );
  if( db->init.busy
   && sqlite3FixInit(&sFix, pParse, db->init.iDb, "trigger", pName)
   && sqlite3FixSrcList(&sFix, pTableName)
  ){
    goto trigger_cleanup;
  }

  /* Build the Trigger object */
  nt = (Trigger*)sqliteMalloc(sizeof(Trigger));
  if( nt==0 ) goto trigger_cleanup;
  nt->name = zName;
  zName = 0;
  nt->table = sqliteStrDup(pTableName->a[0].zName);
  if( sqlite3_malloc_failed ) goto trigger_cleanup;
  nt->iDb = iDb;
  nt->iTabDb = tab->iDb;
  nt->op = op;
  nt->tr_tm = tr_tm;
  nt->pWhen = sqlite3ExprDup(pWhen);
  nt->pColumns = sqlite3IdListDup(pColumns);
  nt->foreach = foreach;

}

/*
** Make a copy of all components of the given trigger step.  This has
** the effect of copying all Expr.token.z values into memory obtained
** from sqliteMalloc().  As initially created, the Expr.token.z values
** all point to the input string that was fed to the parser.  But that
** string is ephemeral - it will go away as soon as the sqlite3_exec()
** call that started the parser exits.  This routine makes a persistent
** copy of all the Expr.token.z strings so that the TriggerStep structure
** will be valid even after the sqlite3_exec() call returns.
*/
static void sqlitePersistTriggerStep(TriggerStep *p){
  if( p->target.z ){
    p->target.z = sqliteStrNDup(p->target.z, p->target.n);
    p->target.dyn = 1;
  }
  if( p->pSelect ){

  Trigger *pTrigger;
  int i;
  const char *zDb;
  const char *zName;
  int nName;
  sqlite *db = pParse->db;

  if( sqlite3_malloc_failed ) goto drop_trigger_cleanup;
  assert( pName->nSrc==1 );
  zDb = pName->a[0].zDatabase;
  zName = pName->a[0].zName;
  nName = strlen(zName);
  for(i=0; i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
    if( zDb && sqlite3StrICmp(db->aDb[j].zName, zDb) ) continue;

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle UPDATE statements.
**
** $Id: update.c,v 1.72 2004/05/10 10:35:00 danielk1977 Exp $
*/
#include "sqliteInt.h"

/*
** Process an UPDATE statement.
**
**   UPDATE OR IGNORE table_wxyz SET a=b, c=d WHERE e<5 AND f NOT NULL;

  int after_triggers;          /* True if there are any AFTER triggers */
  int row_triggers_exist = 0;  /* True if any row triggers exist */

  int newIdx      = -1;  /* index of trigger "new" temp table       */
  int oldIdx      = -1;  /* index of trigger "old" temp table       */

  sContext.pParse = 0;
  if( pParse->nErr || sqlite3_malloc_failed ) goto update_cleanup;
  db = pParse->db;
  assert( pTabList->nSrc==1 );

  /* Locate the table which we want to update. 
  */
  pTab = sqlite3SrcListLookup(pParse, pTabList);
  if( pTab==0 ) goto update_cleanup;

**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.79 2004/05/10 10:35:00 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>
#include <ctype.h>

/*
** If malloc() ever fails, this global variable gets set to 1.
** This causes the library to abort and never again function.
*/
int sqlite3_malloc_failed = 0;

/*
** If MEMORY_DEBUG is defined, then use versions of malloc() and
** free() that track memory usage and check for buffer overruns.
*/
#ifdef MEMORY_DEBUG

/*
** For keeping track of the number of mallocs and frees.   This
** is used to check for memory leaks.
*/
int sqlite3_nMalloc;         /* Number of sqliteMalloc() calls */
int sqlite3_nFree;           /* Number of sqliteFree() calls */
int sqlite3_iMallocFail;     /* Fail sqliteMalloc() after this many calls */
#if MEMORY_DEBUG>1
static int memcnt = 0;
#endif

/*
** Number of 32-bit guard words
*/
#define N_GUARD 1

/*
** Allocate new memory and set it to zero.  Return NULL if
** no memory is available.
*/
void *sqlite3Malloc_(int n, int bZero, char *zFile, int line){
  void *p;
  int *pi;
  int i, k;
  if( sqlite3_iMallocFail>=0 ){
    sqlite3_iMallocFail--;
    if( sqlite3_iMallocFail==0 ){
      sqlite3_malloc_failed++;
#if MEMORY_DEBUG>1
      fprintf(stderr,"**** failed to allocate %d bytes at %s:%d\n",
              n, zFile,line);
#endif
      sqlite3_iMallocFail--;
      return 0;
    }
  }
  if( n==0 ) return 0;
  k = (n+sizeof(int)-1)/sizeof(int);
  pi = malloc( (N_GUARD*2+1+k)*sizeof(int));
  if( pi==0 ){
    sqlite3_malloc_failed++;
    return 0;
  }
  sqlite3_nMalloc++;
  for(i=0; i<N_GUARD; i++) pi[i] = 0xdead1122;
  pi[N_GUARD] = n;
  for(i=0; i<N_GUARD; i++) pi[k+1+N_GUARD+i] = 0xdead3344;
  p = &pi[N_GUARD+1];
  memset(p, bZero==0, n);
#if MEMORY_DEBUG>1
  fprintf(stderr,"%06d malloc %d bytes at 0x%x from %s:%d\n",

** Free memory previously obtained from sqliteMalloc()
*/
void sqlite3Free_(void *p, char *zFile, int line){
  if( p ){
    int *pi, i, k, n;
    pi = p;
    pi -= N_GUARD+1;
    sqlite3_nFree++;
    for(i=0; i<N_GUARD; i++){
      if( pi[i]!=0xdead1122 ){
        fprintf(stderr,"Low-end memory corruption at 0x%x\n", (int)p);
        return;
      }
    }
    n = pi[N_GUARD];

              (int)oldP);
      return 0;
    }
  }
  k = (n + sizeof(int) - 1)/sizeof(int);
  pi = malloc( (k+N_GUARD*2+1)*sizeof(int) );
  if( pi==0 ){
    sqlite3_malloc_failed++;
    return 0;
  }
  for(i=0; i<N_GUARD; i++) pi[i] = 0xdead1122;
  pi[N_GUARD] = n;
  for(i=0; i<N_GUARD; i++) pi[k+N_GUARD+1+i] = 0xdead3344;
  p = &pi[N_GUARD+1];
  memcpy(p, oldP, n>oldN ? oldN : n);

** rather than having to call sqliteFree().
*/
void sqlite3StrRealloc(char **pz){
  char *zNew;
  if( pz==0 || *pz==0 ) return;
  zNew = malloc( strlen(*pz) + 1 );
  if( zNew==0 ){
    sqlite3_malloc_failed++;
    sqliteFree(*pz);
    *pz = 0;
  }
  strcpy(zNew, *pz);
  sqliteFree(*pz);
  *pz = zNew;
}

/*
** Allocate new memory and set it to zero.  Return NULL if
** no memory is available.  See also sqliteMallocRaw().
*/
void *sqliteMalloc(int n){
  void *p;
  if( (p = malloc(n))==0 ){
    if( n>0 ) sqlite3_malloc_failed++;
  }else{
    memset(p, 0, n);
  }
  return p;
}

/*
** Allocate new memory but do not set it to zero.  Return NULL if
** no memory is available.  See also sqliteMalloc().
*/
void *sqliteMallocRaw(int n){
  void *p;
  if( (p = malloc(n))==0 ){
    if( n>0 ) sqlite3_malloc_failed++;
  }
  return p;
}

/*
** Free memory previously obtained from sqliteMalloc()
*/

  }
  if( n==0 ){
    sqliteFree(p);
    return 0;
  }
  p2 = realloc(p, n);
  if( p2==0 ){
    sqlite3_malloc_failed++;
  }
  return p2;
}

/*
** Make a copy of a string in memory obtained from sqliteMalloc()
*/

** But usually the problem will be seen.  The result will be an
** error which can be used to debug the application that is
** using SQLite incorrectly.
**
** Ticket #202:  If db->magic is not a valid open value, take care not
** to modify the db structure at all.  It could be that db is a stale
** pointer.  In other words, it could be that there has been a prior
** call to sqlite3_close(db) and db has been deallocated.  And we do
** not want to write into deallocated memory.
*/
int sqlite3SafetyOn(sqlite *db){
  if( db->magic==SQLITE_MAGIC_OPEN ){
    db->magic = SQLITE_MAGIC_BUSY;
    return 0;
  }else if( db->magic==SQLITE_MAGIC_BUSY || db->magic==SQLITE_MAGIC_ERROR

    db->magic = SQLITE_MAGIC_ERROR;
    db->flags |= SQLITE_Interrupt;
  }
  return 1;
}

/*
** Check to make sure we are not currently executing an sqlite3_exec().
** If we are currently in an sqlite3_exec(), return true and set
** sqlite.magic to SQLITE_MAGIC_ERROR.  This will cause a complete
** shutdown of the database.
**
** This routine is used to try to detect when API routines are called
** at the wrong time or in the wrong sequence.
*/
int sqlite3SafetyCheck(sqlite *db){

**
*************************************************************************
** This file contains code used to implement the VACUUM command.
**
** Most of the code in this file may be omitted by defining the
** SQLITE_OMIT_VACUUM macro.
**
** $Id: vacuum.c,v 1.15 2004/05/10 10:35:00 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"

/*
** A structure for holding a dynamic string - a string that can grow
** without bound. 

** message into *pzErrMsg and return non-zero.
*/
static int execsql(char **pzErrMsg, sqlite *db, const char *zSql){ 
  char *zErrMsg = 0;
  int rc;

  /* printf("***** executing *****\n%s\n", zSql); */
  rc = sqlite3_exec(db, zSql, 0, 0, &zErrMsg);
  if( zErrMsg ){
    sqlite3SetString(pzErrMsg, zErrMsg, (char*)0);
    sqlite3_freemem(zErrMsg);
  }
  return rc;
}

/*
** This is the second stage callback.  Each invocation contains all the
** data for a single row of a single table in the original database.  This

  rc = execsql(p->pzErrMsg, p->dbNew, argv[2]);
  if( rc==SQLITE_OK && strcmp(argv[0],"table")==0 ){
    char *zErrMsg = 0;
    p->s1.nUsed = 0;
    appendText(&p->s1, "SELECT * FROM ", -1);
    appendQuoted(&p->s1, argv[1]);
    p->zTable = argv[1];
    rc = sqlite3_exec(p->dbOld, p->s1.z, vacuumCallback2, p, &zErrMsg);
    if( zErrMsg ){
      sqlite3SetString(p->pzErrMsg, zErrMsg, (char*)0);
      sqlite3_freemem(zErrMsg);
    }
  }
  if( rc!=SQLITE_ABORT ) p->rc = rc;
  return rc;
}

/*

  if( i>=10 ){
    sqlite3SetString(pzErrMsg, "unable to create a temporary database file "
       "in the same directory as the original database", (char*)0);
    goto end_of_vacuum;
  }

  
  dbNew = sqlite3_open(zTemp, 0, &zErrMsg);
  if( dbNew==0 ){
    sqlite3SetString(pzErrMsg, "unable to open a temporary database at ",
       zTemp, " - ", zErrMsg, (char*)0);
    goto end_of_vacuum;
  }
  if( (rc = execsql(pzErrMsg, db, "BEGIN"))!=0 ) goto end_of_vacuum;
  if( (rc = execsql(pzErrMsg, dbNew, "PRAGMA synchronous=off; BEGIN"))!=0 ){
    goto end_of_vacuum;
  }
  
  sVac.dbOld = db;
  sVac.dbNew = dbNew;
  sVac.pzErrMsg = pzErrMsg;
  for(i=0; rc==SQLITE_OK && i<sizeof(zPragma)/sizeof(zPragma[0]); i++){
    char zBuf[200];
    assert( strlen(zPragma[i])<100 );
    sprintf(zBuf, "PRAGMA %s;", zPragma[i]);
    sVac.zPragma = zPragma[i];
    rc = sqlite3_exec(db, zBuf, vacuumCallback3, &sVac, &zErrMsg);
  }
  if( rc==SQLITE_OK ){
    rc = sqlite3_exec(db, 
      "SELECT type, name, sql FROM sqlite_master "
      "WHERE sql NOT NULL AND type!='view' "
      "UNION ALL "
      "SELECT type, name, sql FROM sqlite_master "
      "WHERE sql NOT NULL AND type=='view'",
      vacuumCallback1, &sVac, &zErrMsg);
  }
  if( rc==SQLITE_OK ){
    rc = sqlite3BtreeCopyFile(db->aDb[0].pBt, dbNew->aDb[0].pBt);
    sqlite3_exec(db, "COMMIT", 0, 0, 0);
    sqlite3ResetInternalSchema(db, 0);
  }

end_of_vacuum:
  if( rc && zErrMsg!=0 ){
    sqlite3SetString(pzErrMsg, "unable to vacuum database - ", 
       zErrMsg, (char*)0);
  }
  sqlite3_exec(db, "ROLLBACK", 0, 0, 0);
  if( dbNew ) sqlite3_close(dbNew);
  sqlite3OsDelete(zTemp);
  sqliteFree(zTemp);
  sqliteFree(sVac.s1.z);
  sqliteFree(sVac.s2.z);
  if( zErrMsg ) sqlite3_freemem(zErrMsg);
  if( rc==SQLITE_ABORT ) sVac.rc = SQLITE_ERROR;
  return sVac.rc;
#endif
}

**
** Various scripts scan this source file in order to generate HTML
** documentation, headers files, or other derived files.  The formatting
** of the code in this file is, therefore, important.  See other comments
** in this file for details.  If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
**
** $Id: vdbe.c,v 1.273 2004/05/10 10:35:00 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include "vdbeInt.h"

/*
** The following global variable is incremented every time a cursor
** moves, either by the OP_MoveTo or the OP_Next opcode.  The test
** procedures use this information to make sure that indices are
** working correctly.  This variable has no function other than to
** help verify the correct operation of the library.
*/
int sqlite3_search_count = 0;

/*
** When this global variable is positive, it gets decremented once before
** each instruction in the VDBE.  When reaches zero, the SQLITE_Interrupt
** of the db.flags field is set in order to simulate and interrupt.
**
** This facility is used for testing purposes only.  It does not function
** in an ordinary build.
*/
int sqlite3_interrupt_count = 0;

/*
** Advance the virtual machine to the next output row.
**
** The return vale will be either SQLITE_BUSY, SQLITE_DONE, 
** SQLITE_ROW, SQLITE_ERROR, or SQLITE_MISUSE.
**
** SQLITE_BUSY means that the virtual machine attempted to open
** a locked database and there is no busy callback registered.
** Call sqlite3_step() again to retry the open.  *pN is set to 0
** and *pazColName and *pazValue are both set to NULL.
**
** SQLITE_DONE means that the virtual machine has finished
** executing.  sqlite3_step() should not be called again on this
** virtual machine.  *pN and *pazColName are set appropriately
** but *pazValue is set to NULL.
**
** SQLITE_ROW means that the virtual machine has generated another
** row of the result set.  *pN is set to the number of columns in
** the row.  *pazColName is set to the names of the columns followed
** by the column datatypes.  *pazValue is set to the values of each
** column in the row.  The value of the i-th column is (*pazValue)[i].
** The name of the i-th column is (*pazColName)[i] and the datatype
** of the i-th column is (*pazColName)[i+*pN].
**
** SQLITE_ERROR means that a run-time error (such as a constraint
** violation) has occurred.  The details of the error will be returned
** by the next call to sqlite3_finalize().  sqlite3_step() should not
** be called again on the VM.
**
** SQLITE_MISUSE means that the this routine was called inappropriately.
** Perhaps it was called on a virtual machine that had already been
** finalized or on one that had previously returned SQLITE_ERROR or
** SQLITE_DONE.  Or it could be the case the the same database connection
** is being used simulataneously by two or more threads.
*/
int sqlite3_step(
  sqlite_vm *pVm,              /* The virtual machine to execute */
  int *pN,                     /* OUT: Number of columns in result */
  const char ***pazValue,      /* OUT: Column data */
  const char ***pazColName     /* OUT: Column names and datatypes */
){
  Vdbe *p = (Vdbe*)pVm;
  sqlite *db;

** Convert the given stack entity into a string if it isn't one
** already.
*/
#define Stringify(P) if(((P)->flags & MEM_Str)==0){hardStringify(P);}
static int hardStringify(Mem *pStack){
  int fg = pStack->flags;
  if( fg & MEM_Real ){
    sqlite3_snprintf(sizeof(pStack->zShort),pStack->zShort,"%.15g",pStack->r);
  }else if( fg & MEM_Int ){
    sqlite3_snprintf(sizeof(pStack->zShort),pStack->zShort,"%d",pStack->i);
  }else{
    pStack->zShort[0] = 0;
  }
  pStack->z = pStack->zShort;
  pStack->n = strlen(pStack->zShort)+1;
  pStack->flags = MEM_Str | MEM_Short;
  return 0;

          :"=A" (x));
  return x;
}
#endif

/*
** The CHECK_FOR_INTERRUPT macro defined here looks to see if the
** sqlite3_interrupt() routine has been called.  If it has been, then
** processing of the VDBE program is interrupted.
**
** This macro added to every instruction that does a jump in order to
** implement a loop.  This test used to be on every single instruction,
** but that meant we more testing that we needed.  By only testing the
** flag on jump instructions, we get a (small) speed improvement.
*/

#endif

  if( p->magic!=VDBE_MAGIC_RUN ) return SQLITE_MISUSE;
  assert( db->magic==SQLITE_MAGIC_BUSY );
  assert( p->rc==SQLITE_OK || p->rc==SQLITE_BUSY );
  p->rc = SQLITE_OK;
  assert( p->explain==0 );
  if( sqlite3_malloc_failed ) goto no_mem;
  pTos = p->pTos;
  if( p->popStack ){
    popStack(&pTos, p->popStack);
    p->popStack = 0;
  }
  CHECK_FOR_INTERRUPT;
  for(pc=p->pc; rc==SQLITE_OK; pc++){

    }
#endif

    /* Check to see if we need to simulate an interrupt.  This only happens
    ** if we have a special test build.
    */
#ifdef SQLITE_TEST
    if( sqlite3_interrupt_count>0 ){
      sqlite3_interrupt_count--;
      if( sqlite3_interrupt_count==0 ){
        sqlite3_interrupt(db);
      }
    }
#endif

#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
    /* Call the progress callback if it is configured and the required number
    ** of VDBE ops have been executed (either since this invocation of

}

/* Opcode:  Halt P1 P2 *
**
** Exit immediately.  All open cursors, Lists, Sorts, etc are closed
** automatically.
**
** P1 is the result code returned by sqlite3_exec().  For a normal
** halt, this should be SQLITE_OK (0).  For errors, it can be some
** other value.  If P1!=0 then P2 will determine whether or not to
** rollback the current transaction.  Do not rollback if P2==OE_Fail.
** Do the rollback if P2==OE_Rollback.  If P2==OE_Abort, then back
** out all changes that have occurred during this execution of the
** VDBE, but do not rollback the transaction. 
**

  }
  break;
}

/* Opcode: Variable P1 * *
**
** Push the value of variable P1 onto the stack.  A variable is
** an unknown in the original SQL string as handed to sqlite3_compile().
** Any occurance of the '?' character in the original SQL is considered
** a variable.  Variables in the SQL string are number from left to
** right beginning with 1.  The values of variables are set using the
** sqlite3_bind() API.
*/
case OP_Variable: {
  int j = pOp->p1 - 1;
  pTos++;
  if( j>=0 && j<p->nVar && p->azVar[j]!=0 ){
    pTos->z = p->azVar[j];
    pTos->n = p->anVar[j];

      pTos->flags &= ~MEM_Dyn;
      pTos->flags |= MEM_Ephem;
    }else if( pTos->flags & MEM_Short ){
      memcpy(pTos->zShort, pFrom->zShort, pTos->n);
      pTos->z = pTos->zShort;
    }else if( (pTos->flags & MEM_Static)==0 ){
      pTos->z = sqliteMallocRaw(pFrom->n);
      if( sqlite3_malloc_failed ) goto no_mem;
      memcpy(pTos->z, pFrom->z, pFrom->n);
      pTos->flags &= ~(MEM_Static|MEM_Ephem|MEM_Short);
      pTos->flags |= MEM_Dyn;
    }
  }
  break;
}

        if( db->xBusyCallback==0 ){
          p->pc = pc;
          p->undoTransOnError = 1;
          p->rc = SQLITE_BUSY;
          p->pTos = pTos;
          return SQLITE_BUSY;
        }else if( (*db->xBusyCallback)(db->pBusyArg, "", busy++)==0 ){
          sqlite3SetString(&p->zErrMsg, sqlite3_error_string(rc), (char*)0);
          busy = 0;
        }
        break;
      }
      case SQLITE_READONLY: {
        rc = SQLITE_OK;
        /* Fall thru into the next case */

      case SQLITE_BUSY: {
        if( db->xBusyCallback==0 ){
          p->pc = pc;
          p->rc = SQLITE_BUSY;
          p->pTos = &pTos[1 + (pOp->p2<=0)]; /* Operands must remain on stack */
          return SQLITE_BUSY;
        }else if( (*db->xBusyCallback)(db->pBusyArg, pOp->p3, ++busy)==0 ){
          sqlite3SetString(&p->zErrMsg, sqlite3_error_string(rc), (char*)0);
          busy = 0;
        }
        break;
      }
      case SQLITE_OK: {
        busy = 0;
        break;

      pC->recnoIsValid = res==0;
    }else{
      Stringify(pTos);
      sqlite3BtreeMoveto(pC->pCursor, pTos->z, pTos->n, &res);
      pC->recnoIsValid = 0;
    }
    pC->deferredMoveto = 0;
    sqlite3_search_count++;
    oc = pOp->opcode;
    if( oc==OP_MoveTo && res<0 ){
      sqlite3BtreeNext(pC->pCursor, &res);
      pC->recnoIsValid = 0;
      if( res && pOp->p2>0 ){
        pc = pOp->p2 - 1;
      }

** stack.  The key is the next value down on the stack.  The key must
** be an integer.  The stack is popped twice by this instruction.
**
** If the OPFLAG_NCHANGE flag of P2 is set, then the row change count is
** incremented (otherwise not).  If the OPFLAG_CSCHANGE flag is set,
** then the current statement change count is incremented (otherwise not).
** If the OPFLAG_LASTROWID flag of P2 is set, then rowid is
** stored for subsequent return by the sqlite3_last_insert_rowid() function
** (otherwise it's unmodified).
*/
/* Opcode: PutStrKey P1 * *
**
** Write an entry into the table of cursor P1.  A new entry is
** created if it doesn't already exist or the data for an existing
** entry is overwritten.  The data is the value on the top of the

      assert( pC->deferredMoveto==0 );
      rc = pOp->opcode==OP_Next ? sqlite3BtreeNext(pCrsr, &res) :
                                  sqlite3BtreePrevious(pCrsr, &res);
      pC->nullRow = res;
    }
    if( res==0 ){
      pc = pOp->p2 - 1;
      sqlite3_search_count++;
    }
  }else{
    pC->nullRow = 1;
  }
  pC->recnoIsValid = 0;
  break;
}

  nKey = pTos->n;
  pElem = sqlite3HashFind(&p->agg.hash, zKey, nKey);
  if( pElem ){
    p->agg.pCurrent = pElem;
    pc = pOp->p2 - 1;
  }else{
    AggInsert(&p->agg, zKey, nKey);
    if( sqlite3_malloc_failed ) goto no_mem;
  }
  Release(pTos);
  pTos--;
  break; 
}

/* Opcode: AggSet * P2 *

  }else{
    assert( pTos>=p->aStack );
    Stringify(pTos);
    sqlite3HashInsert(&p->aSet[i].hash, pTos->z, pTos->n, p);
    Release(pTos);
    pTos--;
  }
  if( sqlite3_malloc_failed ) goto no_mem;
  break;
}

/* Opcode: SetFound P1 P2 *
**
** Pop the stack once and compare the value popped off with the
** contents of set P1.  If the element popped exists in set P1,

  if( sqlite3SafetyOn(db) ) goto abort_due_to_misuse;
  break;
}

/* An other opcode is illegal...
*/
default: {
  sqlite3_snprintf(sizeof(zBuf),zBuf,"%d",pOp->opcode);
  sqlite3SetString(&p->zErrMsg, "unknown opcode ", zBuf, (char*)0);
  rc = SQLITE_INTERNAL;
  break;
}

/*****************************************************************************
** The cases of the switch statement above this line should all be indented

  /* Fall thru into abort_due_to_error */

  /* Jump to here for any other kind of fatal error.  The "rc" variable
  ** should hold the error number.
  */
abort_due_to_error:
  if( p->zErrMsg==0 ){
    if( sqlite3_malloc_failed ) rc = SQLITE_NOMEM;
    sqlite3SetString(&p->zErrMsg, sqlite3_error_string(rc), (char*)0);
  }
  goto vdbe_halt;

  /* Jump to here if the sqlite3_interrupt() API sets the interrupt
  ** flag.
  */
abort_due_to_interrupt:
  assert( db->flags & SQLITE_Interrupt );
  db->flags &= ~SQLITE_Interrupt;
  if( db->magic!=SQLITE_MAGIC_BUSY ){
    rc = SQLITE_MISUSE;
  }else{
    rc = SQLITE_INTERRUPT;
  }
  sqlite3SetString(&p->zErrMsg, sqlite3_error_string(rc), (char*)0);
  goto vdbe_halt;
}