src/test1.c

/*
** 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.
**
*************************************************************************
** Code for testing all sorts of SQLite interfaces.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test1.c,v 1.287 2008/01/23 14:51:50 drh Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include <stdlib.h>
#include <string.h>

/*
** This is a copy of the first part of the SqliteDb structure in 
** tclsqlite.c.  We need it here so that the get_sqlite_pointer routine
** can extract the sqlite3* pointer from an existing Tcl SQLite
** connection.
*/
struct SqliteDb {
  sqlite3 *db;
};

/*
** Convert text generated by the "%p" conversion format back into
** a pointer.
*/
static int testHexToInt(int h){
  if( h>='0' && h<='9' ){
    return h - '0';
  }else if( h>='a' && h<='f' ){
    return h - 'a' + 10;
  }else{
    assert( h>='A' && h<='F' );
    return h - 'A' + 10;
  }
}
void *sqlite3TextToPtr(const char *z){
  void *p;
  u64 v;
  u32 v2;
  if( z[0]=='0' && z[1]=='x' ){
    z += 2;
  }
  v = 0;
  while( *z ){
    v = (v<<4) + testHexToInt(*z);
    z++;
  }
  if( sizeof(p)==sizeof(v) ){
    memcpy(&p, &v, sizeof(p));
  }else{
    assert( sizeof(p)==sizeof(v2) );
    v2 = (u32)v;
    memcpy(&p, &v2, sizeof(p));
  }
  return p;
}


/*
** A TCL command that returns the address of the sqlite* pointer
** for an sqlite connection instance.  Bad things happen if the
** input is not an sqlite connection.
*/
static int get_sqlite_pointer(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  struct SqliteDb *p;
  Tcl_CmdInfo cmdInfo;
  char zBuf[100];
  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "SQLITE-CONNECTION");
    return TCL_ERROR;
  }
  if( !Tcl_GetCommandInfo(interp, Tcl_GetString(objv[1]), &cmdInfo) ){
    Tcl_AppendResult(interp, "command not found: ",
           Tcl_GetString(objv[1]), (char*)0);
    return TCL_ERROR;
  }
  p = (struct SqliteDb*)cmdInfo.objClientData;
  sprintf(zBuf, "%p", p->db);
  if( strncmp(zBuf,"0x",2) ){
    sprintf(zBuf, "0x%p", p->db);
  }
  Tcl_AppendResult(interp, zBuf, 0);
  return TCL_OK;
}

/*
** Decode a pointer to an sqlite3 object.
*/
static int getDbPointer(Tcl_Interp *interp, const char *zA, sqlite3 **ppDb){
  struct SqliteDb *p;
  Tcl_CmdInfo cmdInfo;
  if( Tcl_GetCommandInfo(interp, zA, &cmdInfo) ){
    p = (struct SqliteDb*)cmdInfo.objClientData;
    *ppDb = p->db;
  }else{
    *ppDb = (sqlite3*)sqlite3TextToPtr(zA);
  }
  return TCL_OK;
}


const char *sqlite3TestErrorName(int rc){
  const char *zName = 0;
  switch( rc & 0xff ){
    case SQLITE_OK:         zName = "SQLITE_OK";          break;
    case SQLITE_ERROR:      zName = "SQLITE_ERROR";       break;
    case SQLITE_PERM:       zName = "SQLITE_PERM";        break;
    case SQLITE_ABORT:      zName = "SQLITE_ABORT";       break;
    case SQLITE_BUSY:       zName = "SQLITE_BUSY";        break;
    case SQLITE_LOCKED:     zName = "SQLITE_LOCKED";      break;
    case SQLITE_NOMEM:      zName = "SQLITE_NOMEM";       break;
    case SQLITE_READONLY:   zName = "SQLITE_READONLY";    break;
    case SQLITE_INTERRUPT:  zName = "SQLITE_INTERRUPT";   break;
    case SQLITE_IOERR:      zName = "SQLITE_IOERR";       break;
    case SQLITE_CORRUPT:    zName = "SQLITE_CORRUPT";     break;
    case SQLITE_FULL:       zName = "SQLITE_FULL";        break;
    case SQLITE_CANTOPEN:   zName = "SQLITE_CANTOPEN";    break;
    case SQLITE_PROTOCOL:   zName = "SQLITE_PROTOCOL";    break;
    case SQLITE_EMPTY:      zName = "SQLITE_EMPTY";       break;
    case SQLITE_SCHEMA:     zName = "SQLITE_SCHEMA";      break;
    case SQLITE_CONSTRAINT: zName = "SQLITE_CONSTRAINT";  break;
    case SQLITE_MISMATCH:   zName = "SQLITE_MISMATCH";    break;
    case SQLITE_MISUSE:     zName = "SQLITE_MISUSE";      break;
    case SQLITE_NOLFS:      zName = "SQLITE_NOLFS";       break;
    case SQLITE_AUTH:       zName = "SQLITE_AUTH";        break;
    case SQLITE_FORMAT:     zName = "SQLITE_FORMAT";      break;
    case SQLITE_RANGE:      zName = "SQLITE_RANGE";       break;
    case SQLITE_ROW:        zName = "SQLITE_ROW";         break;
    case SQLITE_DONE:       zName = "SQLITE_DONE";        break;
    case SQLITE_NOTADB:     zName = "SQLITE_NOTADB";      break;
    case SQLITE_TOOBIG:     zName = "SQLITE_TOOBIG";      break;
    default:                zName = "SQLITE_Unknown";     break;
  }
  return zName;
}
#define t1ErrorName sqlite3TestErrorName

/*
** Convert an sqlite3_stmt* into an sqlite3*.  This depends on the
** fact that the sqlite3* is the first field in the Vdbe structure.
*/
#define StmtToDb(X)   sqlite3_db_handle(X)

/*
** Check a return value to make sure it agrees with the results
** from sqlite3_errcode.
*/
int sqlite3TestErrCode(Tcl_Interp *interp, sqlite3 *db, int rc){
  if( rc!=SQLITE_MISUSE && rc!=SQLITE_OK && sqlite3_errcode(db)!=rc ){
    char zBuf[200];
    int r2 = sqlite3_errcode(db);
    sprintf(zBuf, "error code %s (%d) does not match sqlite3_errcode %s (%d)",
       t1ErrorName(rc), rc, t1ErrorName(r2), r2);
    Tcl_ResetResult(interp);
    Tcl_AppendResult(interp, zBuf, 0);
    return 1;
  }
  return 0;
}

/*
** Decode a pointer to an sqlite3_stmt object.
*/
static int getStmtPointer(
  Tcl_Interp *interp, 
  const char *zArg,  
  sqlite3_stmt **ppStmt
){
  *ppStmt = (sqlite3_stmt*)sqlite3TextToPtr(zArg);
  return TCL_OK;
}

/*
** Generate a text representation of a pointer that can be understood
** by the getDbPointer and getVmPointer routines above.
**
** The problem is, on some machines (Solaris) if you do a printf with
** "%p" you cannot turn around and do a scanf with the same "%p" and
** get your pointer back.  You have to prepend a "0x" before it will
** work.  Or at least that is what is reported to me (drh).  But this
** behavior varies from machine to machine.  The solution used her is
** to test the string right after it is generated to see if it can be
** understood by scanf, and if not, try prepending an "0x" to see if
** that helps.  If nothing works, a fatal error is generated.
*/
int sqlite3TestMakePointerStr(Tcl_Interp *interp, char *zPtr, void *p){
  sqlite3_snprintf(100, zPtr, "%p", p);
  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;
}

/*
** The I/O tracing callback.
*/
static FILE *iotrace_file = 0;
static void io_trace_callback(const char *zFormat, ...){
  va_list ap;
  va_start(ap, zFormat);
  vfprintf(iotrace_file, zFormat, ap);
  va_end(ap);
  fflush(iotrace_file);
}

/*
** Usage:  io_trace FILENAME
**
** Turn I/O tracing on or off.  If FILENAME is not an empty string,
** I/O tracing begins going into FILENAME. If FILENAME is an empty
** string, I/O tracing is turned off.
*/
static int test_io_trace(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  if( argc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
          " FILENAME\"", 0);
    return TCL_ERROR;
  }
  if( iotrace_file ){
    if( iotrace_file!=stdout && iotrace_file!=stderr ){
      fclose(iotrace_file);
    }
    iotrace_file = 0;
    sqlite3_io_trace = 0;
  }
  if( argv[1][0] ){
    if( strcmp(argv[1],"stdout")==0 ){
      iotrace_file = stdout;
    }else if( strcmp(argv[1],"stderr")==0 ){
      iotrace_file = stderr;
    }else{
      iotrace_file = fopen(argv[1], "w");
    }
    sqlite3_io_trace = io_trace_callback;
  }
  return SQLITE_OK;
}


/*
** 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 */
  char **argv            /* Text of each argument */
){
  sqlite3 *db;
  Tcl_DString str;
  int rc;
  char *zErr = 0;
  char *zSql;
  char zBuf[30];
  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);
  zSql = sqlite3_mprintf(argv[2], argv[3]);
  rc = sqlite3_exec(db, zSql, exec_printf_cb, &str, &zErr);
  sqlite3_free(zSql);
  sprintf(zBuf, "%d", rc);
  Tcl_AppendElement(interp, zBuf);
  Tcl_AppendElement(interp, rc==SQLITE_OK ? Tcl_DStringValue(&str) : zErr);
  Tcl_DStringFree(&str);
  if( zErr ) sqlite3_free(zErr);
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  return TCL_OK;
}

/*
** Usage:  db_enter DB
**         db_leave DB
**
** Enter or leave the mutex on a database connection.
*/
static int db_enter(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite3 *db;
  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;
  sqlite3_mutex_enter(db->mutex);
  return TCL_OK;
}
static int db_leave(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite3 *db;
  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;
  sqlite3_mutex_leave(db->mutex);
  return TCL_OK;
}

/*
** Usage:  sqlite3_exec  DB  SQL
**
** Invoke the sqlite3_exec interface using the open database DB
*/
static int test_exec(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite3 *db;
  Tcl_DString str;
  int rc;
  char *zErr = 0;
  char *zSql;
  int i, j;
  char zBuf[30];
  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;
  Tcl_DStringInit(&str);
  zSql = sqlite3_mprintf("%s", argv[2]);
  for(i=j=0; zSql[i];){
    if( zSql[i]=='%' ){
      zSql[j++] = (testHexToInt(zSql[i+1])<<4) + testHexToInt(zSql[i+2]);
      i += 3;
    }else{
      zSql[j++] = zSql[i++];
    }
  }
  zSql[j] = 0;
  rc = sqlite3_exec(db, zSql, exec_printf_cb, &str, &zErr);
  sqlite3_free(zSql);
  sprintf(zBuf, "%d", rc);
  Tcl_AppendElement(interp, zBuf);
  Tcl_AppendElement(interp, rc==SQLITE_OK ? Tcl_DStringValue(&str) : zErr);
  Tcl_DStringFree(&str);
  if( zErr ) sqlite3_free(zErr);
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  return TCL_OK;
}

/*
** Usage:  sqlite3_exec_nr  DB  SQL
**
** Invoke the sqlite3_exec interface using the open database DB.  Discard
** all results
*/
static int test_exec_nr(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite3 *db;
  int rc;
  char *zErr = 0;
  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], 0, 0, &zErr);
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  return TCL_OK;
}

/*
** Usage:  sqlite3_mprintf_z_test  SEPARATOR  ARG0  ARG1 ...
**
** Test the %z format of sqliteMPrintf().  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_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  char *zResult = 0;
  int i;

  for(i=2; i<argc && (i==2 || zResult); i++){
    zResult = sqlite3MPrintf(0, "%z%s%s", zResult, argv[1], argv[i]);
  }
  Tcl_AppendResult(interp, zResult, 0);
  sqlite3_free(zResult);
  return TCL_OK;
}

/*
** Usage:  sqlite3_mprintf_n_test  STRING
**
** Test the %n format of sqliteMPrintf().  Return the length of the
** input string.
*/
static int test_mprintf_n(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  char *zStr;
  int n = 0;
  zStr = sqlite3MPrintf(0, "%s%n", argv[1], &n);
  sqlite3_free(zStr);
  Tcl_SetObjResult(interp, Tcl_NewIntObj(n));
  return TCL_OK;
}

/*
** Usage:  sqlite3_snprintf_int  SIZE FORMAT  INT
**
** Test the of sqlite3_snprintf() routine.  SIZE is the size of the
** output buffer in bytes.  The maximum size is 100.  FORMAT is the
** format string.  INT is a single integer argument.  The FORMAT
** string must require no more than this one integer argument.  If
** You pass in a format string that requires more than one argument,
** bad things will happen.
*/
static int test_snprintf_int(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  char zStr[100];
  int n = atoi(argv[1]);
  const char *zFormat = argv[2];
  int a1 = atoi(argv[3]);
  if( n>sizeof(zStr) ) n = sizeof(zStr);
  strcpy(zStr, "abcdefghijklmnopqrstuvwxyz");
  sqlite3_snprintf(n, zStr, zFormat, a1);
  Tcl_AppendResult(interp, zStr, 0);
  return TCL_OK;
}

/*
** Usage:  sqlite3_get_table_printf  DB  FORMAT  STRING  ?--no-counts?
**
** 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 */
  char **argv            /* Text of each argument */
){
  sqlite3 *db;
  Tcl_DString str;
  int rc;
  char *zErr = 0;
  int nRow, nCol;
  char **aResult;
  int i;
  char zBuf[30];
  char *zSql;
  int resCount = -1;
  if( argc==5 ){
    if( Tcl_GetInt(interp, argv[4], &resCount) ) return TCL_ERROR;
  }
  if( argc!=4 && argc!=5 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
       " DB FORMAT STRING ?COUNT?", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  Tcl_DStringInit(&str);
  zSql = sqlite3_mprintf(argv[2],argv[3]);
  if( argc==5 ){
    rc = sqlite3_get_table(db, zSql, &aResult, 0, 0, &zErr);
  }else{
    rc = sqlite3_get_table(db, zSql, &aResult, &nRow, &nCol, &zErr);
    resCount = (nRow+1)*nCol;
  }
  sqlite3_free(zSql);
  sprintf(zBuf, "%d", rc);
  Tcl_AppendElement(interp, zBuf);
  if( rc==SQLITE_OK ){
    if( argc==4 ){
      sprintf(zBuf, "%d", nRow);
      Tcl_AppendElement(interp, zBuf);
      sprintf(zBuf, "%d", nCol);
      Tcl_AppendElement(interp, zBuf);
    }
    for(i=0; i<resCount; i++){
      Tcl_AppendElement(interp, aResult[i] ? aResult[i] : "NULL");
    }
  }else{
    Tcl_AppendElement(interp, zErr);
  }
  sqlite3_free_table(aResult);
  if( zErr ) sqlite3_free(zErr);
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  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 */
){
  sqlite3 *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, "%lld", sqlite3_last_insert_rowid(db));
  Tcl_AppendResult(interp, zBuf, 0);
  return SQLITE_OK;
}

/*
** Usage:  sqlite3_key DB KEY
**
** Set the codec key.
*/
static int test_key(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite3 *db;
  const char *zKey;
  int nKey;
  if( argc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FILENAME\"", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  zKey = argv[2];
  nKey = strlen(zKey);
#ifdef SQLITE_HAS_CODEC
  sqlite3_key(db, zKey, nKey);
#endif
  return TCL_OK;
}

/*
** Usage:  sqlite3_rekey DB KEY
**
** Change the codec key.
*/
static int test_rekey(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite3 *db;
  const char *zKey;
  int nKey;
  if( argc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FILENAME\"", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  zKey = argv[2];
  nKey = strlen(zKey);
#ifdef SQLITE_HAS_CODEC
  sqlite3_rekey(db, zKey, nKey);
#endif
  return TCL_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 */
){
  sqlite3 *db;
  int rc;
  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;
  rc = sqlite3_close(db);
  Tcl_SetResult(interp, (char *)t1ErrorName(rc), TCL_STATIC);
  return TCL_OK;
}

/*
** Implementation of the x_coalesce() function.
** Return the first argument non-NULL argument.
*/
static void t1_ifnullFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  int i;
  for(i=0; i<argc; i++){
    if( SQLITE_NULL!=sqlite3_value_type(argv[i]) ){
      int n = sqlite3_value_bytes(argv[i]);
      sqlite3_result_text(context, (char*)sqlite3_value_text(argv[i]),
          n, SQLITE_TRANSIENT);
      break;
    }
  }
}

/*
** These are test functions.    hex8() interprets its argument as
** UTF8 and returns a hex encoding.  hex16le() interprets its argument
** as UTF16le and returns a hex encoding.
*/
static void hex8Func(sqlite3_context *p, int argc, sqlite3_value **argv){
  const unsigned char *z;
  int i;
  char zBuf[200];
  z = sqlite3_value_text(argv[0]);
  for(i=0; i<sizeof(zBuf)/2 - 2 && z[i]; i++){
    sprintf(&zBuf[i*2], "%02x", z[i]&0xff);
  }
  zBuf[i*2] = 0;
  sqlite3_result_text(p, (char*)zBuf, -1, SQLITE_TRANSIENT);
}
#ifndef SQLITE_OMIT_UTF16
static void hex16Func(sqlite3_context *p, int argc, sqlite3_value **argv){
  const unsigned short int *z;
  int i;
  char zBuf[400];
  z = sqlite3_value_text16(argv[0]);
  for(i=0; i<sizeof(zBuf)/4 - 4 && z[i]; i++){
    sprintf(&zBuf[i*4], "%04x", z[i]&0xff);
  }
  zBuf[i*4] = 0;
  sqlite3_result_text(p, (char*)zBuf, -1, SQLITE_TRANSIENT);
}
#endif

/*
** A structure into which to accumulate text.
*/
struct dstr {
  int nAlloc;  /* Space allocated */
  int nUsed;   /* Space used */
  char *z;     /* The space */
};

/*
** Append text to a dstr
*/
static void dstrAppend(struct dstr *p, const char *z, int divider){
  int n = strlen(z);
  if( p->nUsed + n + 2 > p->nAlloc ){
    char *zNew;
    p->nAlloc = p->nAlloc*2 + n + 200;
    zNew = sqlite3_realloc(p->z, p->nAlloc);
    if( zNew==0 ){
      sqlite3_free(p->z);
      memset(p, 0, sizeof(*p));
      return;
    }
    p->z = zNew;
  }
  if( divider && p->nUsed>0 ){
    p->z[p->nUsed++] = divider;
  }
  memcpy(&p->z[p->nUsed], z, n+1);
  p->nUsed += n;
}

/*
** Invoked for each callback from sqlite3ExecFunc
*/
static int execFuncCallback(void *pData, int argc, char **argv, char **NotUsed){
  struct dstr *p = (struct dstr*)pData;
  int i;
  for(i=0; i<argc; i++){
    if( argv[i]==0 ){
      dstrAppend(p, "NULL", ' ');
    }else{
      dstrAppend(p, argv[i], ' ');
    }
  }
  return 0;
}

/*
** Implementation of the x_sqlite_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(
  sqlite3_context *context, 
  int argc,  
  sqlite3_value **argv
){
  struct dstr x;
  memset(&x, 0, sizeof(x));
  (void)sqlite3_exec((sqlite3*)sqlite3_user_data(context),
      (char*)sqlite3_value_text(argv[0]),
      execFuncCallback, &x, 0);
  sqlite3_result_text(context, x.z, x.nUsed, SQLITE_TRANSIENT);
  sqlite3_free(x.z);
}

/*
** Implementation of tkt2213func(), a scalar function that takes exactly
** one argument. It has two interesting features:
**
** * It calls sqlite3_value_text() 3 times on the argument sqlite3_value*.
**   If the three pointers returned are not the same an SQL error is raised.
**
** * Otherwise it returns a copy of the text representation of its 
**   argument in such a way as the VDBE representation is a Mem* cell 
**   with the MEM_Term flag clear. 
**
** Ticket #2213 can therefore be tested by evaluating the following
** SQL expression:
**
**   tkt2213func(tkt2213func('a string'));
*/
static void tkt2213Function(
  sqlite3_context *context, 
  int argc,  
  sqlite3_value **argv
){
  int nText;
  unsigned char const *zText1;
  unsigned char const *zText2;
  unsigned char const *zText3;

  nText = sqlite3_value_bytes(argv[0]);
  zText1 = sqlite3_value_text(argv[0]);
  zText2 = sqlite3_value_text(argv[0]);
  zText3 = sqlite3_value_text(argv[0]);

  if( zText1!=zText2 || zText2!=zText3 ){
    sqlite3_result_error(context, "tkt2213 is not fixed", -1);
  }else{
    char *zCopy = (char *)sqlite3_malloc(nText);
    memcpy(zCopy, zText1, nText);
    sqlite3_result_text(context, zCopy, nText, sqlite3_free);
  }
}

/*
** The following SQL function takes 4 arguments.  The 2nd and
** 4th argument must be one of these strings:  'text', 'text16',
** or 'blob' corresponding to API functions
**
**      sqlite3_value_text()
**      sqlite3_value_text16()
**      sqlite3_value_blob()
**
** The third argument is a string, either 'bytes' or 'bytes16' or 'noop',
** corresponding to APIs:
**
**      sqlite3_value_bytes()
**      sqlite3_value_bytes16()
**      noop
**
** The APIs designated by the 2nd through 4th arguments are applied
** to the first argument in order.  If the pointers returned by the
** second and fourth are different, this routine returns 1.  Otherwise,
** this routine returns 0.
**
** This function is used to test to see when returned pointers from
** the _text(), _text16() and _blob() APIs become invalidated.
*/
static void ptrChngFunction(
  sqlite3_context *context, 
  int argc,  
  sqlite3_value **argv
){
  const void *p1, *p2;
  const char *zCmd;
  if( argc!=4 ) return;
  zCmd = (const char*)sqlite3_value_text(argv[1]);
  if( zCmd==0 ) return;
  if( strcmp(zCmd,"text")==0 ){
    p1 = (const void*)sqlite3_value_text(argv[0]);
#ifndef SQLITE_OMIT_UTF16
  }else if( strcmp(zCmd, "text16")==0 ){
    p1 = (const void*)sqlite3_value_text16(argv[0]);
#endif
  }else if( strcmp(zCmd, "blob")==0 ){
    p1 = (const void*)sqlite3_value_blob(argv[0]);
  }else{
    return;
  }
  zCmd = (const char*)sqlite3_value_text(argv[2]);
  if( zCmd==0 ) return;
  if( strcmp(zCmd,"bytes")==0 ){
    sqlite3_value_bytes(argv[0]);
#ifndef SQLITE_OMIT_UTF16
  }else if( strcmp(zCmd, "bytes16")==0 ){
    sqlite3_value_bytes16(argv[0]);
#endif
  }else if( strcmp(zCmd, "noop")==0 ){
    /* do nothing */
  }else{
    return;
  }
  zCmd = (const char*)sqlite3_value_text(argv[3]);
  if( zCmd==0 ) return;
  if( strcmp(zCmd,"text")==0 ){
    p2 = (const void*)sqlite3_value_text(argv[0]);
#ifndef SQLITE_OMIT_UTF16
  }else if( strcmp(zCmd, "text16")==0 ){
    p2 = (const void*)sqlite3_value_text16(argv[0]);
#endif
  }else if( strcmp(zCmd, "blob")==0 ){
    p2 = (const void*)sqlite3_value_blob(argv[0]);
  }else{
    return;
  }
  sqlite3_result_int(context, p1!=p2);
}


/*
** 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_sqlite_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 */
){
  int rc;
  sqlite3 *db;
  extern void Md5_Register(sqlite3*);

  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;
  rc = sqlite3_create_function(db, "x_coalesce", -1, SQLITE_ANY, 0, 
        t1_ifnullFunc, 0, 0);
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(db, "hex8", 1, SQLITE_ANY, 0, 
          hex8Func, 0, 0);
  }
#ifndef SQLITE_OMIT_UTF16
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(db, "hex16", 1, SQLITE_ANY, 0, 
          hex16Func, 0, 0);
  }
#endif
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(db, "tkt2213func", 1, SQLITE_ANY, 0, 
          tkt2213Function, 0, 0);
  }
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(db, "pointer_change", 4, SQLITE_ANY, 0, 
          ptrChngFunction, 0, 0);
  }

#ifndef SQLITE_OMIT_UTF16
  /* Use the sqlite3_create_function16() API here. Mainly for fun, but also 
  ** because it is not tested anywhere else. */
  if( rc==SQLITE_OK ){
    sqlite3_value *pVal;
    sqlite3_mutex_enter(db->mutex);
    pVal = sqlite3ValueNew(db);
    sqlite3ValueSetStr(pVal, -1, "x_sqlite_exec", SQLITE_UTF8, SQLITE_STATIC);
    if( db->mallocFailed ){
      rc = SQLITE_NOMEM;
    }else{
      rc = sqlite3_create_function16(db, 
              sqlite3ValueText(pVal, SQLITE_UTF16NATIVE),
              1, SQLITE_UTF16, db, sqlite3ExecFunc, 0, 0);
    }
    sqlite3ValueFree(pVal);
    sqlite3_mutex_leave(db->mutex);
  }
#endif

  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  Tcl_SetResult(interp, (char *)t1ErrorName(rc), 0);
  return TCL_OK;
}

/*
** Routines to implement the x_count() aggregate function.
**
** x_count() counts the number of non-null arguments.  But there are
** some twists for testing purposes.
**
** If the argument to x_count() is 40 then a UTF-8 error is reported
** on the step function.  If x_count(41) is seen, then a UTF-16 error
** is reported on the step function.  If the total count is 42, then
** a UTF-8 error is reported on the finalize function.
*/
typedef struct t1CountCtx t1CountCtx;
struct t1CountCtx {
  int n;
};
static void t1CountStep(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  t1CountCtx *p;
  p = sqlite3_aggregate_context(context, sizeof(*p));
  if( (argc==0 || SQLITE_NULL!=sqlite3_value_type(argv[0]) ) && p ){
    p->n++;
  }
  if( argc>0 ){
    int v = sqlite3_value_int(argv[0]);
    if( v==40 ){
      sqlite3_result_error(context, "value of 40 handed to x_count", -1);
#ifndef SQLITE_OMIT_UTF16
    }else if( v==41 ){
      const char zUtf16ErrMsg[] = { 0, 0x61, 0, 0x62, 0, 0x63, 0, 0, 0};
      sqlite3_result_error16(context, &zUtf16ErrMsg[1-SQLITE_BIGENDIAN], -1);
#endif
    }
  }
}   
static void t1CountFinalize(sqlite3_context *context){
  t1CountCtx *p;
  p = sqlite3_aggregate_context(context, sizeof(*p));
  if( p ){
    if( p->n==42 ){
      sqlite3_result_error(context, "x_count totals to 42", -1);
    }else{
      sqlite3_result_int(context, p ? p->n : 0);
    }
  }
}

static void legacyCountStep(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  /* no-op */
}
static void legacyCountFinalize(sqlite3_context *context){
  sqlite3_result_int(context, sqlite3_aggregate_count(context));
}

/*
** Usage:  sqlite3_create_aggregate DB
**
** Call the sqlite3_create_function API on the given database in order
** to create a function named "x_count".  This function is similar
** to the built-in count() function, with a few special quirks
** for testing the sqlite3_result_error() APIs.
**
** 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.  See misuse.test.
**
** This routine was later extended to test the use of sqlite3_result_error()
** within aggregate functions.
**
** Later: It is now also extended to register the aggregate function
** "legacy_count()" with the supplied database handle. This is used
** to test the deprecated sqlite3_aggregate_count() API.
*/
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 */
){
  sqlite3 *db;
  int rc;
  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;
  rc = sqlite3_create_function(db, "x_count", 0, SQLITE_UTF8, 0, 0,
      t1CountStep,t1CountFinalize);
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(db, "x_count", 1, SQLITE_UTF8, 0, 0,
        t1CountStep,t1CountFinalize);
  }
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(db, "legacy_count", 0, SQLITE_ANY, 0, 0,
        legacyCountStep, legacyCountFinalize
    );
  }
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  Tcl_SetResult(interp, (char *)t1ErrorName(rc), 0);
  return TCL_OK;
}


/*
** Usage:  printf TEXT
**
** Send output to printf.  Use this rather than puts to merge the output
** in the correct sequence with debugging printfs inserted into C code.
** Puts uses a separate buffer and debugging statements will be out of
** sequence if it is used.
*/
static int test_printf(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  if( argc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " TEXT\"", 0);
    return TCL_ERROR;
  }
  printf("%s\n", argv[1]);
  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_free(z);
  return TCL_OK;
}

/*
** If zNum represents an integer that will fit in 64-bits, then set
** *pValue to that integer and return true.  Otherwise return false.
*/
static int sqlite3GetInt64(const char *zNum, i64 *pValue){
  if( sqlite3FitsIn64Bits(zNum, 0) ){
    sqlite3Atoi64(zNum, pValue);
    return 1;
  }
  return 0;
}

/*
** Usage:  sqlite3_mprintf_int64 FORMAT INTEGER INTEGER INTEGER
**
** Call mprintf with three 64-bit integer arguments
*/
static int sqlite3_mprintf_int64(
  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;
  sqlite_int64 a[3];
  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( !sqlite3GetInt64(argv[i], &a[i-2]) ){
      Tcl_AppendResult(interp, "argument is not a valid 64-bit integer", 0);
      return TCL_ERROR;
    }
  }
  z = sqlite3_mprintf(argv[1], a[0], a[1], a[2]);
  Tcl_AppendResult(interp, z, 0);
  sqlite3_free(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_free(z);
  return TCL_OK;
}

/*
** Usage:  sqlite3_snprintf_str INTEGER FORMAT INTEGER INTEGER STRING
**
** Call mprintf with two integer arguments and one string argument
*/
static int sqlite3_snprintf_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;
  int n;
  char *z;
  if( argc<5 || argc>6 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " INT FORMAT INT INT ?STRING?\"", 0);
    return TCL_ERROR;
  }
  if( Tcl_GetInt(interp, argv[1], &n) ) return TCL_ERROR;
  if( n<0 ){
    Tcl_AppendResult(interp, "N must be non-negative", 0);
    return TCL_ERROR;
  }
  for(i=3; i<5; i++){
    if( Tcl_GetInt(interp, argv[i], &a[i-3]) ) return TCL_ERROR;
  }
  z = sqlite3_malloc( n+1 );
  sqlite3_snprintf(n, z, argv[2], a[0], a[1], argc>4 ? argv[5] : NULL);
  Tcl_AppendResult(interp, z, 0);
  sqlite3_free(z);
  return TCL_OK;
}

/*
** Usage:  sqlite3_mprintf_double 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 DOUBLE\"", 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_free(z);
  return TCL_OK;
}

/*
** Usage:  sqlite3_mprintf_scaled 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_free(z);
  return TCL_OK;
}

/*
** Usage:  sqlite3_mprintf_stronly FORMAT STRING
**
** 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_stronly(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  char *z;
  if( argc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FORMAT STRING\"", 0);
    return TCL_ERROR;
  }
  z = sqlite3_mprintf(argv[1], argv[2]);
  Tcl_AppendResult(interp, z, 0);
  sqlite3_free(z);
  return TCL_OK;
}

/*
** Usage:  sqlite3_mprintf_hexdouble FORMAT HEX
**
** Call mprintf with a single double argument which is derived from the
** hexadecimal encoding of an IEEE double.
*/
static int sqlite3_mprintf_hexdouble(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  char *z;
  double r;
  unsigned  x1, x2;
  long long unsigned d;
  if( argc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
       " FORMAT STRING\"", 0);
    return TCL_ERROR;
  }
  if( sscanf(argv[2], "%08x%08x", &x2, &x1)!=2 ){
    Tcl_AppendResult(interp, "2nd argument should be 16-characters of hex", 0);
    return TCL_ERROR;
  }
  d = x2;
  d = (d<<32) + x1;
  memcpy(&r, &d, sizeof(r));
  z = sqlite3_mprintf(argv[1], r);
  Tcl_AppendResult(interp, z, 0);
  sqlite3_free(z);
  return TCL_OK;
}

/*
** Usage: sqlite3_enable_shared_cache      BOOLEAN
**
*/
#if !defined(SQLITE_OMIT_SHARED_CACHE)
static int test_enable_shared(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  int rc;
  int enable;
  int ret = 0;
  extern int sqlite3SharedCacheEnabled;

  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "BOOLEAN");
    return TCL_ERROR;
  }
  if( Tcl_GetBooleanFromObj(interp, objv[1], &enable) ){
    return TCL_ERROR;
  }
  ret = sqlite3SharedCacheEnabled;
  rc = sqlite3_enable_shared_cache(enable);
  if( rc!=SQLITE_OK ){
    Tcl_SetResult(interp, (char *)sqlite3ErrStr(rc), TCL_STATIC);
    return TCL_ERROR;
  }
  Tcl_SetObjResult(interp, Tcl_NewBooleanObj(ret));
  return TCL_OK;
}
#endif



/*
** Usage: sqlite3_extended_result_codes   DB    BOOLEAN
**
*/
static int test_extended_result_codes(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  int enable;
  sqlite3 *db;

  if( objc!=3 ){
    Tcl_WrongNumArgs(interp, 1, objv, "DB BOOLEAN");
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  if( Tcl_GetBooleanFromObj(interp, objv[2], &enable) ) return TCL_ERROR;
  sqlite3_extended_result_codes(db, enable);
  return TCL_OK;
}

/*
** Usage: sqlite3_libversion_number
**
*/
static int test_libversion_number(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  Tcl_SetObjResult(interp, Tcl_NewIntObj(sqlite3_libversion_number()));
  return TCL_OK;
}

/*
** Usage: sqlite3_table_column_metadata DB dbname tblname colname
**
*/
#ifdef SQLITE_ENABLE_COLUMN_METADATA
static int test_table_column_metadata(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  sqlite3 *db;
  const char *zDb;
  const char *zTbl;
  const char *zCol;
  int rc;
  Tcl_Obj *pRet;

  const char *zDatatype;
  const char *zCollseq;
  int notnull;
  int primarykey;
  int autoincrement;

  if( objc!=5 ){
    Tcl_WrongNumArgs(interp, 1, objv, "DB dbname tblname colname");
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  zDb = Tcl_GetString(objv[2]);
  zTbl = Tcl_GetString(objv[3]);
  zCol = Tcl_GetString(objv[4]);

  if( strlen(zDb)==0 ) zDb = 0;

  rc = sqlite3_table_column_metadata(db, zDb, zTbl, zCol, 
      &zDatatype, &zCollseq, &notnull, &primarykey, &autoincrement);

  if( rc!=SQLITE_OK ){
    Tcl_AppendResult(interp, sqlite3_errmsg(db), 0);
    return TCL_ERROR;
  }

  pRet = Tcl_NewObj();
  Tcl_ListObjAppendElement(0, pRet, Tcl_NewStringObj(zDatatype, -1));
  Tcl_ListObjAppendElement(0, pRet, Tcl_NewStringObj(zCollseq, -1));
  Tcl_ListObjAppendElement(0, pRet, Tcl_NewIntObj(notnull));
  Tcl_ListObjAppendElement(0, pRet, Tcl_NewIntObj(primarykey));
  Tcl_ListObjAppendElement(0, pRet, Tcl_NewIntObj(autoincrement));
  Tcl_SetObjResult(interp, pRet);

  return TCL_OK;
}
#endif

#ifndef SQLITE_OMIT_INCRBLOB

/*
** sqlite3_blob_read  CHANNEL OFFSET N
**
**   This command is used to test the sqlite3_blob_read() in ways that
**   the Tcl channel interface does not. The first argument should
**   be the name of a valid channel created by the [incrblob] method
**   of a database handle. This function calls sqlite3_blob_read()
**   to read N bytes from offset OFFSET from the underlying SQLite
**   blob handle.
**
**   On success, a byte-array object containing the read data is 
**   returned. On failure, the interpreter result is set to the
**   text representation of the returned error code (i.e. "SQLITE_NOMEM")
**   and a Tcl exception is thrown.
*/
static int test_blob_read(
  ClientData clientData, /* Not used */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  Tcl_Channel channel;
  ClientData instanceData;
  sqlite3_blob *pBlob;
  int notUsed;
  int nByte;
  int iOffset;
  unsigned char *zBuf;
  int rc;
  
  if( objc!=4 ){
    Tcl_WrongNumArgs(interp, 1, objv, "CHANNEL OFFSET N");
    return TCL_ERROR;
  }

  channel = Tcl_GetChannel(interp, Tcl_GetString(objv[1]), &notUsed);
  if( !channel
   || TCL_OK!=Tcl_GetIntFromObj(interp, objv[2], &iOffset)
   || TCL_OK!=Tcl_GetIntFromObj(interp, objv[3], &nByte)
   || nByte<0 || iOffset<0
  ){ 
    return TCL_ERROR;
  }

  instanceData = Tcl_GetChannelInstanceData(channel);
  pBlob = *((sqlite3_blob **)instanceData);

  zBuf = (unsigned char *)Tcl_Alloc(nByte);
  rc = sqlite3_blob_read(pBlob, zBuf, nByte, iOffset);
  if( rc==SQLITE_OK ){
    Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(zBuf, nByte));
  }else{
    Tcl_SetResult(interp, (char *)sqlite3TestErrorName(rc), TCL_VOLATILE);
  }
  Tcl_Free((char *)zBuf);

  return (rc==SQLITE_OK ? TCL_OK : TCL_ERROR);
}

/*
** sqlite3_blob_write CHANNEL OFFSET DATA
**
**   This command is used to test the sqlite3_blob_write() in ways that
**   the Tcl channel interface does not. The first argument should
**   be the name of a valid channel created by the [incrblob] method
**   of a database handle. This function calls sqlite3_blob_write()
**   to write the DATA byte-array to the underlying SQLite blob handle.
**   at offset OFFSET.
**
**   On success, an empty string is returned. On failure, the interpreter
**   result is set to the text representation of the returned error code 
**   (i.e. "SQLITE_NOMEM") and a Tcl exception is thrown.
*/
static int test_blob_write(
  ClientData clientData, /* Not used */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  Tcl_Channel channel;
  ClientData instanceData;
  sqlite3_blob *pBlob;
  int notUsed;
  int iOffset;
  int rc;

  unsigned char *zBuf;
  int nBuf;
  
  if( objc!=4 ){
    Tcl_WrongNumArgs(interp, 1, objv, "CHANNEL OFFSET DATA");
    return TCL_ERROR;
  }

  channel = Tcl_GetChannel(interp, Tcl_GetString(objv[1]), &notUsed);
  if( !channel
   || TCL_OK!=Tcl_GetIntFromObj(interp, objv[2], &iOffset)
   || iOffset<0
  ){ 
    return TCL_ERROR;
  }

  instanceData = Tcl_GetChannelInstanceData(channel);
  pBlob = *((sqlite3_blob **)instanceData);

  zBuf = Tcl_GetByteArrayFromObj(objv[3], &nBuf);
  rc = sqlite3_blob_write(pBlob, zBuf, nBuf, iOffset);
  if( rc!=SQLITE_OK ){
    Tcl_SetResult(interp, (char *)sqlite3TestErrorName(rc), TCL_VOLATILE);
  }

  return (rc==SQLITE_OK ? TCL_OK : TCL_ERROR);
}
#endif

/*
** Usage: sqlite3_create_collation_v2 DB-HANDLE NAME CMP-PROC DEL-PROC
**
**   This Tcl proc is used for testing the experimental
**   sqlite3_create_collation_v2() interface.
*/
struct TestCollationX {
  Tcl_Interp *interp;
  Tcl_Obj *pCmp;
  Tcl_Obj *pDel;
};
typedef struct TestCollationX TestCollationX;
static void testCreateCollationDel(void *pCtx){
  TestCollationX *p = (TestCollationX *)pCtx;

  int rc = Tcl_EvalObjEx(p->interp, p->pDel, TCL_EVAL_DIRECT|TCL_EVAL_GLOBAL);
  if( rc!=TCL_OK ){
    Tcl_BackgroundError(p->interp);
  }

  Tcl_DecrRefCount(p->pCmp);
  Tcl_DecrRefCount(p->pDel);
  sqlite3_free((void *)p);
}
static int testCreateCollationCmp(
  void *pCtx,
  int nLeft,
  const void *zLeft,
  int nRight,
  const void *zRight
){
  TestCollationX *p = (TestCollationX *)pCtx;
  Tcl_Obj *pScript = Tcl_DuplicateObj(p->pCmp);
  int iRes = 0;

  Tcl_IncrRefCount(pScript);
  Tcl_ListObjAppendElement(0, pScript, Tcl_NewStringObj((char *)zLeft, nLeft));
  Tcl_ListObjAppendElement(0, pScript, Tcl_NewStringObj((char *)zRight,nRight));

  if( TCL_OK!=Tcl_EvalObjEx(p->interp, pScript, TCL_EVAL_DIRECT|TCL_EVAL_GLOBAL)
   || TCL_OK!=Tcl_GetIntFromObj(p->interp, Tcl_GetObjResult(p->interp), &iRes)
  ){
    Tcl_BackgroundError(p->interp);
  }
  Tcl_DecrRefCount(pScript);

  return iRes;
}
static int test_create_collation_v2(
  ClientData clientData, /* Not used */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  TestCollationX *p;
  sqlite3 *db;

  if( objc!=5 ){
    Tcl_WrongNumArgs(interp, 1, objv, "DB-HANDLE NAME CMP-PROC DEL-PROC");
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;

  p = (TestCollationX *)sqlite3_malloc(sizeof(TestCollationX));
  p->pCmp = objv[3];
  p->pDel = objv[4];
  p->interp = interp;
  Tcl_IncrRefCount(p->pCmp);
  Tcl_IncrRefCount(p->pDel);

  sqlite3_create_collation_v2(db, Tcl_GetString(objv[2]), SQLITE_UTF8, 
      (void *)p, testCreateCollationCmp, testCreateCollationDel
  );
  return TCL_OK;
}

/*
** Usage: sqlite3_load_extension DB-HANDLE FILE ?PROC?
*/
static int test_load_extension(
  ClientData clientData, /* Not used */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  Tcl_CmdInfo cmdInfo;
  sqlite3 *db;
  int rc;
  char *zDb;
  char *zFile;
  char *zProc = 0;
  char *zErr = 0;

  if( objc!=4 && objc!=3 ){
    Tcl_WrongNumArgs(interp, 1, objv, "DB-HANDLE FILE ?PROC?");
    return TCL_ERROR;
  }
  zDb = Tcl_GetString(objv[1]);
  zFile = Tcl_GetString(objv[2]);
  if( objc==4 ){
    zProc = Tcl_GetString(objv[3]);
  }

  /* Extract the C database handle from the Tcl command name */
  if( !Tcl_GetCommandInfo(interp, zDb, &cmdInfo) ){
    Tcl_AppendResult(interp, "command not found: ", zDb, (char*)0);
    return TCL_ERROR;
  }
  db = ((struct SqliteDb*)cmdInfo.objClientData)->db;
  assert(db);

  /* Call the underlying C function. If an error occurs, set rc to 
  ** TCL_ERROR and load any error string into the interpreter. If no 
  ** error occurs, set rc to TCL_OK.
  */
#ifdef SQLITE_OMIT_LOAD_EXTENSION
  rc = SQLITE_ERROR;
  zErr = sqlite3_mprintf("this build omits sqlite3_load_extension()");
#else
  rc = sqlite3_load_extension(db, zFile, zProc, &zErr);
#endif
  if( rc!=SQLITE_OK ){
    Tcl_SetResult(interp, zErr ? zErr : "", TCL_VOLATILE);
    rc = TCL_ERROR;
  }else{
    rc = TCL_OK;
  }
  sqlite3_free(zErr);

  return rc;
}

/*
** Usage: sqlite3_enable_load_extension DB-HANDLE ONOFF
*/
static int test_enable_load(
  ClientData clientData, /* Not used */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  Tcl_CmdInfo cmdInfo;
  sqlite3 *db;
  char *zDb;
  int onoff;

  if( objc!=3 ){
    Tcl_WrongNumArgs(interp, 1, objv, "DB-HANDLE ONOFF");
    return TCL_ERROR;
  }
  zDb = Tcl_GetString(objv[1]);

  /* Extract the C database handle from the Tcl command name */
  if( !Tcl_GetCommandInfo(interp, zDb, &cmdInfo) ){
    Tcl_AppendResult(interp, "command not found: ", zDb, (char*)0);
    return TCL_ERROR;
  }
  db = ((struct SqliteDb*)cmdInfo.objClientData)->db;
  assert(db);

  /* Get the onoff parameter */
  if( Tcl_GetBooleanFromObj(interp, objv[2], &onoff) ){
    return TCL_ERROR;
  }

#ifdef SQLITE_OMIT_LOAD_EXTENSION
  Tcl_AppendResult(interp, "this build omits sqlite3_load_extension()");
  return TCL_ERROR;
#else
  sqlite3_enable_load_extension(db, onoff);
  return TCL_OK;
#endif
}

/*
** Usage:  sqlite_abort
**
** Shutdown the process immediately.  This is not a clean shutdown.
** This command is used to test the recoverability of a database in
** the event of a program crash.
*/
static int sqlite_abort(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  assert( interp==0 );   /* This will always fail */
  return TCL_OK;
}

/*
** The following routine is a user-defined SQL function whose purpose
** is to test the sqlite_set_result() API.
*/
static void testFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
  while( argc>=2 ){
    const char *zArg0 = (char*)sqlite3_value_text(argv[0]);
    if( zArg0 ){
      if( 0==sqlite3StrICmp(zArg0, "int") ){
        sqlite3_result_int(context, sqlite3_value_int(argv[1]));
      }else if( sqlite3StrICmp(zArg0,"int64")==0 ){
        sqlite3_result_int64(context, sqlite3_value_int64(argv[1]));
      }else if( sqlite3StrICmp(zArg0,"string")==0 ){
        sqlite3_result_text(context, (char*)sqlite3_value_text(argv[1]), -1,
            SQLITE_TRANSIENT);
      }else if( sqlite3StrICmp(zArg0,"double")==0 ){
        sqlite3_result_double(context, sqlite3_value_double(argv[1]));
      }else if( sqlite3StrICmp(zArg0,"null")==0 ){
        sqlite3_result_null(context);
      }else if( sqlite3StrICmp(zArg0,"value")==0 ){
        sqlite3_result_value(context, argv[sqlite3_value_int(argv[1])]);
      }else{
        goto error_out;
      }
    }else{
      goto error_out;
    }
    argc -= 2;
    argv += 2;
  }
  return;

error_out:
  sqlite3_result_error(context,"first argument should be one of: "
      "int int64 string double null value", -1);
}

/*
** Usage:   sqlite_register_test_function  DB  NAME
**
** Register the test SQL function on the database DB under the name NAME.
*/
static int test_register_func(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite3 *db;
  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, SQLITE_UTF8, 0, 
      testFunc, 0, 0);
  if( rc!=0 ){
    Tcl_AppendResult(interp, sqlite3ErrStr(rc), 0);
    return TCL_ERROR;
  }
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  return TCL_OK;
}

/*
** Usage:  sqlite3_finalize  STMT 
**
** Finalize a statement handle.
*/
static int test_finalize(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int rc;
  sqlite3 *db = 0;

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " <STMT>", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;

  if( pStmt ){
    db = StmtToDb(pStmt);
  }
  rc = sqlite3_finalize(pStmt);
  Tcl_SetResult(interp, (char *)t1ErrorName(rc), TCL_STATIC);
  if( db && sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  return TCL_OK;
}

/*
** Usage:  sqlite3_reset  STMT 
**
** Reset a statement handle.
*/
static int test_reset(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int rc;

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " <STMT>", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;

  rc = sqlite3_reset(pStmt);
  if( pStmt && sqlite3TestErrCode(interp, StmtToDb(pStmt), rc) ){
    return TCL_ERROR;
  }
  Tcl_SetResult(interp, (char *)t1ErrorName(rc), TCL_STATIC);
/*
  if( rc ){
    return TCL_ERROR;
  }
*/
  return TCL_OK;
}

/*
** Usage:  sqlite3_expired STMT 
**
** Return TRUE if a recompilation of the statement is recommended.
*/
static int test_expired(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " <STMT>", 0);
    return TCL_ERROR;
  }
  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  Tcl_SetObjResult(interp, Tcl_NewBooleanObj(sqlite3_expired(pStmt)));
  return TCL_OK;
}

/*
** Usage:  sqlite3_transfer_bindings FROMSTMT TOSTMT
**
** Transfer all bindings from FROMSTMT over to TOSTMT
*/
static int test_transfer_bind(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt1, *pStmt2;
  if( objc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " FROM-STMT TO-STMT", 0);
    return TCL_ERROR;
  }
  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt1)) return TCL_ERROR;
  if( getStmtPointer(interp, Tcl_GetString(objv[2]), &pStmt2)) return TCL_ERROR;
  Tcl_SetObjResult(interp, 
     Tcl_NewIntObj(sqlite3_transfer_bindings(pStmt1,pStmt2)));
  return TCL_OK;
}

/*
** Usage:  sqlite3_changes DB
**
** Return the number of changes made to the database by the last SQL
** execution.
*/
static int test_changes(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3 *db;
  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
       Tcl_GetString(objv[0]), " DB", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  Tcl_SetObjResult(interp, Tcl_NewIntObj(sqlite3_changes(db)));
  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;
static int sqlite_static_bind_nbyte = 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.  If FLAGS=="blob10" then a VALUE is ignored
** an a 10-byte blob "abc\000xyz\000pq" is inserted.
*/
static int test_bind(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  sqlite3_stmt *pStmt;
  int rc;
  int idx;
  if( argc!=5 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
       " VM IDX VALUE (null|static|normal)\"", 0);
    return TCL_ERROR;
  }
  if( getStmtPointer(interp, argv[1], &pStmt) ) return TCL_ERROR;
  if( Tcl_GetInt(interp, argv[2], &idx) ) return TCL_ERROR;
  if( strcmp(argv[4],"null")==0 ){
    rc = sqlite3_bind_null(pStmt, idx);
  }else if( strcmp(argv[4],"static")==0 ){
    rc = sqlite3_bind_text(pStmt, idx, sqlite_static_bind_value, -1, 0);
  }else if( strcmp(argv[4],"static-nbytes")==0 ){
    rc = sqlite3_bind_text(pStmt, idx, sqlite_static_bind_value,
                                       sqlite_static_bind_nbyte, 0);
  }else if( strcmp(argv[4],"normal")==0 ){
    rc = sqlite3_bind_text(pStmt, idx, argv[3], -1, SQLITE_TRANSIENT);
  }else if( strcmp(argv[4],"blob10")==0 ){
    rc = sqlite3_bind_text(pStmt, idx, "abc\000xyz\000pq", 10, SQLITE_STATIC);
  }else{
    Tcl_AppendResult(interp, "4th argument should be "
        "\"null\" or \"static\" or \"normal\"", 0);
    return TCL_ERROR;
  }
  if( sqlite3TestErrCode(interp, StmtToDb(pStmt), rc) ) return TCL_ERROR;
  if( rc ){
    char zBuf[50];
    sprintf(zBuf, "(%d) ", rc);
    Tcl_AppendResult(interp, zBuf, sqlite3ErrStr(rc), 0);
    return TCL_ERROR;
  }
  return TCL_OK;
}

#ifndef SQLITE_OMIT_UTF16
/*
** Usage: add_test_collate <db ptr> <utf8> <utf16le> <utf16be>
**
** This function is used to test that SQLite selects the correct collation
** sequence callback when multiple versions (for different text encodings)
** are available.
**
** Calling this routine registers the collation sequence "test_collate"
** with database handle <db>. The second argument must be a list of three
** boolean values. If the first is true, then a version of test_collate is
** registered for UTF-8, if the second is true, a version is registered for
** UTF-16le, if the third is true, a UTF-16be version is available.
** Previous versions of test_collate are deleted.
**
** The collation sequence test_collate is implemented by calling the
** following TCL script:
**
**   "test_collate <enc> <lhs> <rhs>"
**
** The <lhs> and <rhs> are the two values being compared, encoded in UTF-8.
** The <enc> parameter is the encoding of the collation function that
** SQLite selected to call. The TCL test script implements the
** "test_collate" proc.
**
** Note that this will only work with one intepreter at a time, as the
** interp pointer to use when evaluating the TCL script is stored in
** pTestCollateInterp.
*/
static Tcl_Interp* pTestCollateInterp;
static int test_collate_func(
  void *pCtx, 
  int nA, const void *zA,
  int nB, const void *zB
){
  Tcl_Interp *i = pTestCollateInterp;
  int encin = (int)pCtx;
  int res;
  int n;

  sqlite3_value *pVal;
  Tcl_Obj *pX;

  pX = Tcl_NewStringObj("test_collate", -1);
  Tcl_IncrRefCount(pX);

  switch( encin ){
    case SQLITE_UTF8:
      Tcl_ListObjAppendElement(i,pX,Tcl_NewStringObj("UTF-8",-1));
      break;
    case SQLITE_UTF16LE:
      Tcl_ListObjAppendElement(i,pX,Tcl_NewStringObj("UTF-16LE",-1));
      break;
    case SQLITE_UTF16BE:
      Tcl_ListObjAppendElement(i,pX,Tcl_NewStringObj("UTF-16BE",-1));
      break;
    default:
      assert(0);
  }

  pVal = sqlite3ValueNew(0);
  sqlite3ValueSetStr(pVal, nA, zA, encin, SQLITE_STATIC);
  n = sqlite3_value_bytes(pVal);
  Tcl_ListObjAppendElement(i,pX,
      Tcl_NewStringObj((char*)sqlite3_value_text(pVal),n));
  sqlite3ValueSetStr(pVal, nB, zB, encin, SQLITE_STATIC);
  n = sqlite3_value_bytes(pVal);
  Tcl_ListObjAppendElement(i,pX,
      Tcl_NewStringObj((char*)sqlite3_value_text(pVal),n));
  sqlite3ValueFree(pVal);

  Tcl_EvalObjEx(i, pX, 0);
  Tcl_DecrRefCount(pX);
  Tcl_GetIntFromObj(i, Tcl_GetObjResult(i), &res);
  return res;
}
static int test_collate(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3 *db;
  int val;
  sqlite3_value *pVal;
  int rc;

  if( objc!=5 ) goto bad_args;
  pTestCollateInterp = interp;
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;

  if( TCL_OK!=Tcl_GetBooleanFromObj(interp, objv[2], &val) ) return TCL_ERROR;
  rc = sqlite3_create_collation(db, "test_collate", SQLITE_UTF8, 
          (void *)SQLITE_UTF8, val?test_collate_func:0);
  if( rc==SQLITE_OK ){
    if( TCL_OK!=Tcl_GetBooleanFromObj(interp, objv[3], &val) ) return TCL_ERROR;
    rc = sqlite3_create_collation(db, "test_collate", SQLITE_UTF16LE, 
            (void *)SQLITE_UTF16LE, val?test_collate_func:0);
    if( TCL_OK!=Tcl_GetBooleanFromObj(interp, objv[4], &val) ) return TCL_ERROR;

#if 0
    if( sqlite3_iMallocFail>0 ){
      sqlite3_iMallocFail++;
    }
#endif
    sqlite3_mutex_enter(db->mutex);
    pVal = sqlite3ValueNew(db);
    sqlite3ValueSetStr(pVal, -1, "test_collate", SQLITE_UTF8, SQLITE_STATIC);
    if( db->mallocFailed ){
      rc = SQLITE_NOMEM;
    }else{
      rc = sqlite3_create_collation16(db, 
          sqlite3ValueText(pVal, SQLITE_UTF16NATIVE), SQLITE_UTF16BE, 
          (void *)SQLITE_UTF16BE, val?test_collate_func:0);
    }
    sqlite3ValueFree(pVal);
    sqlite3_mutex_leave(db->mutex);
  }
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  
  if( rc!=SQLITE_OK ){
    Tcl_AppendResult(interp, sqlite3TestErrorName(rc), 0);
    return TCL_ERROR;
  }
  return TCL_OK;

bad_args:
  Tcl_AppendResult(interp, "wrong # args: should be \"",
      Tcl_GetStringFromObj(objv[0], 0), " <DB> <utf8> <utf16le> <utf16be>", 0);
  return TCL_ERROR;
}

/*
** When the collation needed callback is invoked, record the name of 
** the requested collating function here.  The recorded name is linked
** to a TCL variable and used to make sure that the requested collation
** name is correct.
*/
static char zNeededCollation[200];
static char *pzNeededCollation = zNeededCollation;


/*
** Called when a collating sequence is needed.  Registered using
** sqlite3_collation_needed16().
*/
static void test_collate_needed_cb(
  void *pCtx, 
  sqlite3 *db,
  int eTextRep,
  const void *pName
){
  int enc = ENC(db);
  int i;
  char *z;
  for(z = (char*)pName, i=0; *z || z[1]; z++){
    if( *z ) zNeededCollation[i++] = *z;
  }
  zNeededCollation[i] = 0;
  sqlite3_create_collation(
      db, "test_collate", ENC(db), (void *)enc, test_collate_func);
}

/*
** Usage: add_test_collate_needed DB
*/
static int test_collate_needed(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3 *db;
  int rc;

  if( objc!=2 ) goto bad_args;
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  rc = sqlite3_collation_needed16(db, 0, test_collate_needed_cb);
  zNeededCollation[0] = 0;
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  return TCL_OK;

bad_args:
  Tcl_WrongNumArgs(interp, 1, objv, "DB");
  return TCL_ERROR;
}

/*
** tclcmd:   add_alignment_test_collations  DB
**
** Add two new collating sequences to the database DB
**
**     utf16_aligned
**     utf16_unaligned
**
** Both collating sequences use the same sort order as BINARY.
** The only difference is that the utf16_aligned collating
** sequence is declared with the SQLITE_UTF16_ALIGNED flag.
** Both collating functions increment the unaligned utf16 counter
** whenever they see a string that begins on an odd byte boundary.
*/
static int unaligned_string_counter = 0;
static int alignmentCollFunc(
  void *NotUsed,
  int nKey1, const void *pKey1,
  int nKey2, const void *pKey2
){
  int rc, n;
  n = nKey1<nKey2 ? nKey1 : nKey2;
  if( nKey1>0 && 1==(1&(int)pKey1) ) unaligned_string_counter++;
  if( nKey2>0 && 1==(1&(int)pKey2) ) unaligned_string_counter++;
  rc = memcmp(pKey1, pKey2, n);
  if( rc==0 ){
    rc = nKey1 - nKey2;
  }
  return rc;
}
static int add_alignment_test_collations(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3 *db;
  if( objc>=2 ){
    if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
    sqlite3_create_collation(db, "utf16_unaligned",
        SQLITE_UTF16, 
        0, alignmentCollFunc);
    sqlite3_create_collation(db, "utf16_aligned",
        SQLITE_UTF16 | SQLITE_UTF16_ALIGNED, 
        0, alignmentCollFunc);
  }
  return SQLITE_OK;
}
#endif /* !defined(SQLITE_OMIT_UTF16) */

/*
** Usage: add_test_function <db ptr> <utf8> <utf16le> <utf16be>
**
** This function is used to test that SQLite selects the correct user
** function callback when multiple versions (for different text encodings)
** are available.
**
** Calling this routine registers up to three versions of the user function
** "test_function" with database handle <db>.  If the second argument is
** true, then a version of test_function is registered for UTF-8, if the
** third is true, a version is registered for UTF-16le, if the fourth is
** true, a UTF-16be version is available.  Previous versions of
** test_function are deleted.
**
** The user function is implemented by calling the following TCL script:
**
**   "test_function <enc> <arg>"
**
** Where <enc> is one of UTF-8, UTF-16LE or UTF16BE, and <arg> is the
** single argument passed to the SQL function. The value returned by
** the TCL script is used as the return value of the SQL function. It
** is passed to SQLite using UTF-16BE for a UTF-8 test_function(), UTF-8
** for a UTF-16LE test_function(), and UTF-16LE for an implementation that
** prefers UTF-16BE.
*/
#ifndef SQLITE_OMIT_UTF16
static void test_function_utf8(
  sqlite3_context *pCtx, 
  int nArg,
  sqlite3_value **argv
){
  Tcl_Interp *interp;
  Tcl_Obj *pX;
  sqlite3_value *pVal;
  interp = (Tcl_Interp *)sqlite3_user_data(pCtx);
  pX = Tcl_NewStringObj("test_function", -1);
  Tcl_IncrRefCount(pX);
  Tcl_ListObjAppendElement(interp, pX, Tcl_NewStringObj("UTF-8", -1));
  Tcl_ListObjAppendElement(interp, pX, 
      Tcl_NewStringObj((char*)sqlite3_value_text(argv[0]), -1));
  Tcl_EvalObjEx(interp, pX, 0);
  Tcl_DecrRefCount(pX);
  sqlite3_result_text(pCtx, Tcl_GetStringResult(interp), -1, SQLITE_TRANSIENT);
  pVal = sqlite3ValueNew(0);
  sqlite3ValueSetStr(pVal, -1, Tcl_GetStringResult(interp), 
      SQLITE_UTF8, SQLITE_STATIC);
  sqlite3_result_text16be(pCtx, sqlite3_value_text16be(pVal),
      -1, SQLITE_TRANSIENT);
  sqlite3ValueFree(pVal);
}
static void test_function_utf16le(
  sqlite3_context *pCtx, 
  int nArg,
  sqlite3_value **argv
){
  Tcl_Interp *interp;
  Tcl_Obj *pX;
  sqlite3_value *pVal;
  interp = (Tcl_Interp *)sqlite3_user_data(pCtx);
  pX = Tcl_NewStringObj("test_function", -1);
  Tcl_IncrRefCount(pX);
  Tcl_ListObjAppendElement(interp, pX, Tcl_NewStringObj("UTF-16LE", -1));
  Tcl_ListObjAppendElement(interp, pX, 
      Tcl_NewStringObj((char*)sqlite3_value_text(argv[0]), -1));
  Tcl_EvalObjEx(interp, pX, 0);
  Tcl_DecrRefCount(pX);
  pVal = sqlite3ValueNew(0);
  sqlite3ValueSetStr(pVal, -1, Tcl_GetStringResult(interp), 
      SQLITE_UTF8, SQLITE_STATIC);
  sqlite3_result_text(pCtx,(char*)sqlite3_value_text(pVal),-1,SQLITE_TRANSIENT);
  sqlite3ValueFree(pVal);
}
static void test_function_utf16be(
  sqlite3_context *pCtx, 
  int nArg,
  sqlite3_value **argv
){
  Tcl_Interp *interp;
  Tcl_Obj *pX;
  sqlite3_value *pVal;
  interp = (Tcl_Interp *)sqlite3_user_data(pCtx);
  pX = Tcl_NewStringObj("test_function", -1);
  Tcl_IncrRefCount(pX);
  Tcl_ListObjAppendElement(interp, pX, Tcl_NewStringObj("UTF-16BE", -1));
  Tcl_ListObjAppendElement(interp, pX, 
      Tcl_NewStringObj((char*)sqlite3_value_text(argv[0]), -1));
  Tcl_EvalObjEx(interp, pX, 0);
  Tcl_DecrRefCount(pX);
  pVal = sqlite3ValueNew(0);
  sqlite3ValueSetStr(pVal, -1, Tcl_GetStringResult(interp), 
      SQLITE_UTF8, SQLITE_STATIC);
  sqlite3_result_text16(pCtx, sqlite3_value_text16le(pVal),
      -1, SQLITE_TRANSIENT);
  sqlite3_result_text16be(pCtx, sqlite3_value_text16le(pVal),
      -1, SQLITE_TRANSIENT);
  sqlite3_result_text16le(pCtx, sqlite3_value_text16le(pVal),
      -1, SQLITE_TRANSIENT);
  sqlite3ValueFree(pVal);
}
#endif /* SQLITE_OMIT_UTF16 */
static int test_function(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#ifndef SQLITE_OMIT_UTF16
  sqlite3 *db;
  int val;

  if( objc!=5 ) goto bad_args;
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;

  if( TCL_OK!=Tcl_GetBooleanFromObj(interp, objv[2], &val) ) return TCL_ERROR;
  if( val ){
    sqlite3_create_function(db, "test_function", 1, SQLITE_UTF8, 
        interp, test_function_utf8, 0, 0);
  }
  if( TCL_OK!=Tcl_GetBooleanFromObj(interp, objv[3], &val) ) return TCL_ERROR;
  if( val ){
    sqlite3_create_function(db, "test_function", 1, SQLITE_UTF16LE, 
        interp, test_function_utf16le, 0, 0);
  }
  if( TCL_OK!=Tcl_GetBooleanFromObj(interp, objv[4], &val) ) return TCL_ERROR;
  if( val ){
    sqlite3_create_function(db, "test_function", 1, SQLITE_UTF16BE, 
        interp, test_function_utf16be, 0, 0);
  }

  return TCL_OK;
bad_args:
  Tcl_AppendResult(interp, "wrong # args: should be \"",
      Tcl_GetStringFromObj(objv[0], 0), " <DB> <utf8> <utf16le> <utf16be>", 0);
#endif /* SQLITE_OMIT_UTF16 */
  return TCL_ERROR;
}

/*
** Usage:         test_errstr <err code>
**
** Test that the english language string equivalents for sqlite error codes
** are sane. The parameter is an integer representing an sqlite error code.
** The result is a list of two elements, the string representation of the
** error code and the english language explanation.
*/
static int test_errstr(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  char *zCode;
  int i;
  if( objc!=1 ){
    Tcl_WrongNumArgs(interp, 1, objv, "<error code>");
  }

  zCode = Tcl_GetString(objv[1]);
  for(i=0; i<200; i++){
    if( 0==strcmp(t1ErrorName(i), zCode) ) break;
  }
  Tcl_SetResult(interp, (char *)sqlite3ErrStr(i), 0);
  return TCL_OK;
}

/*
** Usage:    breakpoint
**
** This routine exists for one purpose - to provide a place to put a
** breakpoint with GDB that can be triggered using TCL code.  The use
** for this is when a particular test fails on (say) the 1485th iteration.
** In the TCL test script, we can add code like this:
**
**     if {$i==1485} breakpoint
**
** Then run testfixture in the debugger and wait for the breakpoint to
** fire.  Then additional breakpoints can be set to trace down the bug.
*/
static int test_breakpoint(
  void *NotUsed,
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int argc,              /* Number of arguments */
  char **argv            /* Text of each argument */
){
  return TCL_OK;         /* Do nothing */
}

/*
** Usage:   sqlite3_bind_zeroblob  STMT IDX N
**
** Test the sqlite3_bind_zeroblob interface.  STMT is a prepared statement.
** IDX is the index of a wildcard in the prepared statement.  This command
** binds a N-byte zero-filled BLOB to the wildcard.
*/
static int test_bind_zeroblob(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int idx;
  int n;
  int rc;

  if( objc!=4 ){
    Tcl_WrongNumArgs(interp, 1, objv, "STMT IDX N");
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &idx) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[3], &n) ) return TCL_ERROR;

  rc = sqlite3_bind_zeroblob(pStmt, idx, n);
  if( sqlite3TestErrCode(interp, StmtToDb(pStmt), rc) ) return TCL_ERROR;
  if( rc!=SQLITE_OK ){
    return TCL_ERROR;
  }

  return TCL_OK;
}

/*
** Usage:   sqlite3_bind_int  STMT N VALUE
**
** Test the sqlite3_bind_int interface.  STMT is a prepared statement.
** N is the index of a wildcard in the prepared statement.  This command
** binds a 32-bit integer VALUE to that wildcard.
*/
static int test_bind_int(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int idx;
  int value;
  int rc;

  if( objc!=4 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " STMT N VALUE", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &idx) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[3], &value) ) return TCL_ERROR;

  rc = sqlite3_bind_int(pStmt, idx, value);
  if( sqlite3TestErrCode(interp, StmtToDb(pStmt), rc) ) return TCL_ERROR;
  if( rc!=SQLITE_OK ){
    return TCL_ERROR;
  }

  return TCL_OK;
}


/*
** Usage:   sqlite3_bind_int64  STMT N VALUE
**
** Test the sqlite3_bind_int64 interface.  STMT is a prepared statement.
** N is the index of a wildcard in the prepared statement.  This command
** binds a 64-bit integer VALUE to that wildcard.
*/
static int test_bind_int64(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int idx;
  i64 value;
  int rc;

  if( objc!=4 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " STMT N VALUE", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &idx) ) return TCL_ERROR;
  if( Tcl_GetWideIntFromObj(interp, objv[3], &value) ) return TCL_ERROR;

  rc = sqlite3_bind_int64(pStmt, idx, value);
  if( sqlite3TestErrCode(interp, StmtToDb(pStmt), rc) ) return TCL_ERROR;
  if( rc!=SQLITE_OK ){
    return TCL_ERROR;
  }

  return TCL_OK;
}


/*
** Usage:   sqlite3_bind_double  STMT N VALUE
**
** Test the sqlite3_bind_double interface.  STMT is a prepared statement.
** N is the index of a wildcard in the prepared statement.  This command
** binds a 64-bit integer VALUE to that wildcard.
*/
static int test_bind_double(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int idx;
  double value;
  int rc;

  if( objc!=4 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " STMT N VALUE", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &idx) ) return TCL_ERROR;
  if( Tcl_GetDoubleFromObj(interp, objv[3], &value) ) return TCL_ERROR;

  rc = sqlite3_bind_double(pStmt, idx, value);
  if( sqlite3TestErrCode(interp, StmtToDb(pStmt), rc) ) return TCL_ERROR;
  if( rc!=SQLITE_OK ){
    return TCL_ERROR;
  }

  return TCL_OK;
}

/*
** Usage:   sqlite3_bind_null  STMT N
**
** Test the sqlite3_bind_null interface.  STMT is a prepared statement.
** N is the index of a wildcard in the prepared statement.  This command
** binds a NULL to the wildcard.
*/
static int test_bind_null(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int idx;
  int rc;

  if( objc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " STMT N", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &idx) ) return TCL_ERROR;

  rc = sqlite3_bind_null(pStmt, idx);
  if( sqlite3TestErrCode(interp, StmtToDb(pStmt), rc) ) return TCL_ERROR;
  if( rc!=SQLITE_OK ){
    return TCL_ERROR;
  }

  return TCL_OK;
}

/*
** Usage:   sqlite3_bind_text  STMT N STRING BYTES
**
** Test the sqlite3_bind_text interface.  STMT is a prepared statement.
** N is the index of a wildcard in the prepared statement.  This command
** binds a UTF-8 string STRING to the wildcard.  The string is BYTES bytes
** long.
*/
static int test_bind_text(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int idx;
  int bytes;
  char *value;
  int rc;

  if( objc!=5 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " STMT N VALUE BYTES", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &idx) ) return TCL_ERROR;
  value = Tcl_GetString(objv[3]);
  if( Tcl_GetIntFromObj(interp, objv[4], &bytes) ) return TCL_ERROR;

  rc = sqlite3_bind_text(pStmt, idx, value, bytes, SQLITE_TRANSIENT);
  if( sqlite3TestErrCode(interp, StmtToDb(pStmt), rc) ) return TCL_ERROR;
  if( rc!=SQLITE_OK ){
    Tcl_AppendResult(interp, sqlite3TestErrorName(rc), 0);
    return TCL_ERROR;
  }

  return TCL_OK;
}

/*
** Usage:   sqlite3_bind_text16 ?-static? STMT N STRING BYTES
**
** Test the sqlite3_bind_text16 interface.  STMT is a prepared statement.
** N is the index of a wildcard in the prepared statement.  This command
** binds a UTF-16 string STRING to the wildcard.  The string is BYTES bytes
** long.
*/
static int test_bind_text16(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#ifndef SQLITE_OMIT_UTF16
  sqlite3_stmt *pStmt;
  int idx;
  int bytes;
  char *value;
  int rc;

  void (*xDel)() = (objc==6?SQLITE_STATIC:SQLITE_TRANSIENT);
  Tcl_Obj *oStmt    = objv[objc-4];
  Tcl_Obj *oN       = objv[objc-3];
  Tcl_Obj *oString  = objv[objc-2];
  Tcl_Obj *oBytes   = objv[objc-1];

  if( objc!=5 && objc!=6){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " STMT N VALUE BYTES", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(oStmt), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, oN, &idx) ) return TCL_ERROR;
  value = (char*)Tcl_GetByteArrayFromObj(oString, 0);
  if( Tcl_GetIntFromObj(interp, oBytes, &bytes) ) return TCL_ERROR;

  rc = sqlite3_bind_text16(pStmt, idx, (void *)value, bytes, xDel);
  if( sqlite3TestErrCode(interp, StmtToDb(pStmt), rc) ) return TCL_ERROR;
  if( rc!=SQLITE_OK ){
    return TCL_ERROR;
  }

#endif /* SQLITE_OMIT_UTF16 */
  return TCL_OK;
}

/*
** Usage:   sqlite3_bind_blob ?-static? STMT N DATA BYTES
**
** Test the sqlite3_bind_blob interface.  STMT is a prepared statement.
** N is the index of a wildcard in the prepared statement.  This command
** binds a BLOB to the wildcard.  The BLOB is BYTES bytes in size.
*/
static int test_bind_blob(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int idx;
  int bytes;
  char *value;
  int rc;
  sqlite3_destructor_type xDestructor = SQLITE_TRANSIENT;

  if( objc!=5 && objc!=6 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " STMT N DATA BYTES", 0);
    return TCL_ERROR;
  }

  if( objc==6 ){
    xDestructor = SQLITE_STATIC;
    objv++;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &idx) ) return TCL_ERROR;
  value = Tcl_GetString(objv[3]);
  if( Tcl_GetIntFromObj(interp, objv[4], &bytes) ) return TCL_ERROR;

  rc = sqlite3_bind_blob(pStmt, idx, value, bytes, xDestructor);
  if( sqlite3TestErrCode(interp, StmtToDb(pStmt), rc) ) return TCL_ERROR;
  if( rc!=SQLITE_OK ){
    return TCL_ERROR;
  }

  return TCL_OK;
}

/*
** Usage:   sqlite3_bind_parameter_count  STMT
**
** Return the number of wildcards in the given statement.
*/
static int test_bind_parameter_count(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;

  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "STMT");
    return TCL_ERROR;
  }
  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  Tcl_SetObjResult(interp, Tcl_NewIntObj(sqlite3_bind_parameter_count(pStmt)));
  return TCL_OK;
}

/*
** Usage:   sqlite3_bind_parameter_name  STMT  N
**
** Return the name of the Nth wildcard.  The first wildcard is 1.
** An empty string is returned if N is out of range or if the wildcard
** is nameless.
*/
static int test_bind_parameter_name(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int i;

  if( objc!=3 ){
    Tcl_WrongNumArgs(interp, 1, objv, "STMT N");
    return TCL_ERROR;
  }
  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &i) ) return TCL_ERROR;
  Tcl_SetObjResult(interp, 
     Tcl_NewStringObj(sqlite3_bind_parameter_name(pStmt,i),-1)
  );
  return TCL_OK;
}

/*
** Usage:   sqlite3_bind_parameter_index  STMT  NAME
**
** Return the index of the wildcard called NAME.  Return 0 if there is
** no such wildcard.
*/
static int test_bind_parameter_index(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;

  if( objc!=3 ){
    Tcl_WrongNumArgs(interp, 1, objv, "STMT NAME");
    return TCL_ERROR;
  }
  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  Tcl_SetObjResult(interp, 
     Tcl_NewIntObj(
       sqlite3_bind_parameter_index(pStmt,Tcl_GetString(objv[2]))
     )
  );
  return TCL_OK;
}

/*
** Usage:   sqlite3_clear_bindings STMT
**
*/
static int test_clear_bindings(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;

  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "STMT");
    return TCL_ERROR;
  }
  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  Tcl_SetObjResult(interp, Tcl_NewIntObj(sqlite3_clear_bindings(pStmt)));
  return TCL_OK;
}

/*
** Usage:   sqlite3_sleep MILLISECONDS
*/
static int test_sleep(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  int ms;

  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "MILLISECONDS");
    return TCL_ERROR;
  }
  if( Tcl_GetIntFromObj(interp, objv[1], &ms) ){
    return TCL_ERROR;
  }
  Tcl_SetObjResult(interp, Tcl_NewIntObj(sqlite3_sleep(ms)));
  return TCL_OK;
}

/*
** Usage: sqlite3_errcode DB
**
** Return the string representation of the most recent sqlite3_* API
** error code. e.g. "SQLITE_ERROR".
*/
static int test_errcode(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3 *db;
  int rc;
  char zBuf[30];

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " DB", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  rc = sqlite3_errcode(db);
  if( (rc&0xff)==rc ){
    zBuf[0] = 0;
  }else{
    sprintf(zBuf,"+%d", rc>>8);
  }
  Tcl_AppendResult(interp, (char *)t1ErrorName(rc), zBuf, 0);
  return TCL_OK;
}

/*
** Usage:   test_errmsg DB
**
** Returns the UTF-8 representation of the error message string for the
** most recent sqlite3_* API call.
*/
static int test_errmsg(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3 *db;
  const char *zErr;

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " DB", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;

  zErr = sqlite3_errmsg(db);
  Tcl_SetObjResult(interp, Tcl_NewStringObj(zErr, -1));
  return TCL_OK;
}

/*
** Usage:   test_errmsg16 DB
**
** Returns the UTF-16 representation of the error message string for the
** most recent sqlite3_* API call. This is a byte array object at the TCL 
** level, and it includes the 0x00 0x00 terminator bytes at the end of the
** UTF-16 string.
*/
static int test_errmsg16(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#ifndef SQLITE_OMIT_UTF16
  sqlite3 *db;
  const void *zErr;
  int bytes = 0;

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " DB", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;

  zErr = sqlite3_errmsg16(db);
  if( zErr ){
    bytes = sqlite3Utf16ByteLen(zErr, -1);
  }
  Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(zErr, bytes));
#endif /* SQLITE_OMIT_UTF16 */
  return TCL_OK;
}

/*
** Usage: sqlite3_prepare DB sql bytes tailvar
**
** Compile up to <bytes> bytes of the supplied SQL string <sql> using
** database handle <DB>. The parameter <tailval> is the name of a global
** variable that is set to the unused portion of <sql> (if any). A
** STMT handle is returned.
*/
static int test_prepare(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3 *db;
  const char *zSql;
  int bytes;
  const char *zTail = 0;
  sqlite3_stmt *pStmt = 0;
  char zBuf[50];
  int rc;

  if( objc!=5 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " DB sql bytes tailvar", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  zSql = Tcl_GetString(objv[2]);
  if( Tcl_GetIntFromObj(interp, objv[3], &bytes) ) return TCL_ERROR;

  rc = sqlite3_prepare(db, zSql, bytes, &pStmt, &zTail);
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  if( zTail ){
    if( bytes>=0 ){
      bytes = bytes - (zTail-zSql);
    }
    Tcl_ObjSetVar2(interp, objv[4], 0, Tcl_NewStringObj(zTail, bytes), 0);
  }
  if( rc!=SQLITE_OK ){
    assert( pStmt==0 );
    sprintf(zBuf, "(%d) ", rc);
    Tcl_AppendResult(interp, zBuf, sqlite3_errmsg(db), 0);
    return TCL_ERROR;
  }

  if( pStmt ){
    if( sqlite3TestMakePointerStr(interp, zBuf, pStmt) ) return TCL_ERROR;
    Tcl_AppendResult(interp, zBuf, 0);
  }
  return TCL_OK;
}

/*
** Usage: sqlite3_prepare_v2 DB sql bytes tailvar
**
** Compile up to <bytes> bytes of the supplied SQL string <sql> using
** database handle <DB>. The parameter <tailval> is the name of a global
** variable that is set to the unused portion of <sql> (if any). A
** STMT handle is returned.
*/
static int test_prepare_v2(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3 *db;
  const char *zSql;
  int bytes;
  const char *zTail = 0;
  sqlite3_stmt *pStmt = 0;
  char zBuf[50];
  int rc;

  if( objc!=5 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " DB sql bytes tailvar", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  zSql = Tcl_GetString(objv[2]);
  if( Tcl_GetIntFromObj(interp, objv[3], &bytes) ) return TCL_ERROR;

  rc = sqlite3_prepare_v2(db, zSql, bytes, &pStmt, &zTail);
  assert(rc==SQLITE_OK || pStmt==0);
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  if( zTail ){
    if( bytes>=0 ){
      bytes = bytes - (zTail-zSql);
    }
    Tcl_ObjSetVar2(interp, objv[4], 0, Tcl_NewStringObj(zTail, bytes), 0);
  }
  if( rc!=SQLITE_OK ){
    assert( pStmt==0 );
    sprintf(zBuf, "(%d) ", rc);
    Tcl_AppendResult(interp, zBuf, sqlite3_errmsg(db), 0);
    return TCL_ERROR;
  }

  if( pStmt ){
    if( sqlite3TestMakePointerStr(interp, zBuf, pStmt) ) return TCL_ERROR;
    Tcl_AppendResult(interp, zBuf, 0);
  }
  return TCL_OK;
}

/*
** Usage: sqlite3_prepare16 DB sql bytes tailvar
**
** Compile up to <bytes> bytes of the supplied SQL string <sql> using
** database handle <DB>. The parameter <tailval> is the name of a global
** variable that is set to the unused portion of <sql> (if any). A
** STMT handle is returned.
*/
static int test_prepare16(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#ifndef SQLITE_OMIT_UTF16
  sqlite3 *db;
  const void *zSql;
  const void *zTail = 0;
  Tcl_Obj *pTail = 0;
  sqlite3_stmt *pStmt = 0;
  char zBuf[50]; 
  int rc;
  int bytes;                /* The integer specified as arg 3 */
  int objlen;               /* The byte-array length of arg 2 */

  if( objc!=5 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " DB sql bytes tailvar", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  zSql = Tcl_GetByteArrayFromObj(objv[2], &objlen);
  if( Tcl_GetIntFromObj(interp, objv[3], &bytes) ) return TCL_ERROR;

  rc = sqlite3_prepare16(db, zSql, bytes, &pStmt, &zTail);
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  if( rc ){
    return TCL_ERROR;
  }

  if( zTail ){
    objlen = objlen - ((u8 *)zTail-(u8 *)zSql);
  }else{
    objlen = 0;
  }
  pTail = Tcl_NewByteArrayObj((u8 *)zTail, objlen);
  Tcl_IncrRefCount(pTail);
  Tcl_ObjSetVar2(interp, objv[4], 0, pTail, 0);
  Tcl_DecrRefCount(pTail);

  if( pStmt ){
    if( sqlite3TestMakePointerStr(interp, zBuf, pStmt) ) return TCL_ERROR;
  }
  Tcl_AppendResult(interp, zBuf, 0);
#endif /* SQLITE_OMIT_UTF16 */
  return TCL_OK;
}

/*
** Usage: sqlite3_prepare16_v2 DB sql bytes tailvar
**
** Compile up to <bytes> bytes of the supplied SQL string <sql> using
** database handle <DB>. The parameter <tailval> is the name of a global
** variable that is set to the unused portion of <sql> (if any). A
** STMT handle is returned.
*/
static int test_prepare16_v2(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#ifndef SQLITE_OMIT_UTF16
  sqlite3 *db;
  const void *zSql;
  const void *zTail = 0;
  Tcl_Obj *pTail = 0;
  sqlite3_stmt *pStmt = 0;
  char zBuf[50]; 
  int rc;
  int bytes;                /* The integer specified as arg 3 */
  int objlen;               /* The byte-array length of arg 2 */

  if( objc!=5 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " DB sql bytes tailvar", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  zSql = Tcl_GetByteArrayFromObj(objv[2], &objlen);
  if( Tcl_GetIntFromObj(interp, objv[3], &bytes) ) return TCL_ERROR;

  rc = sqlite3_prepare16_v2(db, zSql, bytes, &pStmt, &zTail);
  if( sqlite3TestErrCode(interp, db, rc) ) return TCL_ERROR;
  if( rc ){
    return TCL_ERROR;
  }

  if( zTail ){
    objlen = objlen - ((u8 *)zTail-(u8 *)zSql);
  }else{
    objlen = 0;
  }
  pTail = Tcl_NewByteArrayObj((u8 *)zTail, objlen);
  Tcl_IncrRefCount(pTail);
  Tcl_ObjSetVar2(interp, objv[4], 0, pTail, 0);
  Tcl_DecrRefCount(pTail);

  if( pStmt ){
    if( sqlite3TestMakePointerStr(interp, zBuf, pStmt) ) return TCL_ERROR;
  }
  Tcl_AppendResult(interp, zBuf, 0);
#endif /* SQLITE_OMIT_UTF16 */
  return TCL_OK;
}

/*
** Usage: sqlite3_open filename ?options-list?
*/
static int test_open(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  const char *zFilename;
  sqlite3 *db;
  int rc;
  char zBuf[100];

  if( objc!=3 && objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " filename options-list", 0);
    return TCL_ERROR;
  }

  zFilename = Tcl_GetString(objv[1]);
  rc = sqlite3_open(zFilename, &db);
  
  if( sqlite3TestMakePointerStr(interp, zBuf, db) ) return TCL_ERROR;
  Tcl_AppendResult(interp, zBuf, 0);
  return TCL_OK;
}

/*
** Usage: sqlite3_open16 filename options
*/
static int test_open16(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#ifndef SQLITE_OMIT_UTF16
  const void *zFilename;
  sqlite3 *db;
  int rc;
  char zBuf[100];

  if( objc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " filename options-list", 0);
    return TCL_ERROR;
  }

  zFilename = Tcl_GetByteArrayFromObj(objv[1], 0);
  rc = sqlite3_open16(zFilename, &db);
  
  if( sqlite3TestMakePointerStr(interp, zBuf, db) ) return TCL_ERROR;
  Tcl_AppendResult(interp, zBuf, 0);
#endif /* SQLITE_OMIT_UTF16 */
  return TCL_OK;
}

/*
** Usage: sqlite3_complete16 <UTF-16 string>
**
** Return 1 if the supplied argument is a complete SQL statement, or zero
** otherwise.
*/
static int test_complete16(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#if !defined(SQLITE_OMIT_COMPLETE) && !defined(SQLITE_OMIT_UTF16)
  char *zBuf;

  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "<utf-16 sql>");
    return TCL_ERROR;
  }

  zBuf = (char*)Tcl_GetByteArrayFromObj(objv[1], 0);
  Tcl_SetObjResult(interp, Tcl_NewIntObj(sqlite3_complete16(zBuf)));
#endif /* SQLITE_OMIT_COMPLETE && SQLITE_OMIT_UTF16 */
  return TCL_OK;
}

/*
** Usage: sqlite3_step STMT
**
** Advance the statement to the next row.
*/
static int test_step(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int rc;

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " STMT", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  rc = sqlite3_step(pStmt);

  /* if( rc!=SQLITE_DONE && rc!=SQLITE_ROW ) return TCL_ERROR; */
  Tcl_SetResult(interp, (char *)t1ErrorName(rc), 0);
  return TCL_OK;
}

/*
** Usage: sqlite3_column_count STMT 
**
** Return the number of columns returned by the sql statement STMT.
*/
static int test_column_count(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " STMT column", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;

  Tcl_SetObjResult(interp, Tcl_NewIntObj(sqlite3_column_count(pStmt)));
  return TCL_OK;
}

/*
** Usage: sqlite3_column_type STMT column
**
** Return the type of the data in column 'column' of the current row.
*/
static int test_column_type(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int col;
  int tp;

  if( objc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " STMT column", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &col) ) return TCL_ERROR;

  tp = sqlite3_column_type(pStmt, col);
  switch( tp ){
    case SQLITE_INTEGER: 
      Tcl_SetResult(interp, "INTEGER", TCL_STATIC); 
      break;
    case SQLITE_NULL:
      Tcl_SetResult(interp, "NULL", TCL_STATIC); 
      break;
    case SQLITE_FLOAT:
      Tcl_SetResult(interp, "FLOAT", TCL_STATIC); 
      break;
    case SQLITE_TEXT:
      Tcl_SetResult(interp, "TEXT", TCL_STATIC); 
      break;
    case SQLITE_BLOB:
      Tcl_SetResult(interp, "BLOB", TCL_STATIC); 
      break;
    default:
      assert(0);
  }

  return TCL_OK;
}

/*
** Usage: sqlite3_column_int64 STMT column
**
** Return the data in column 'column' of the current row cast as an
** wide (64-bit) integer.
*/
static int test_column_int64(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int col;
  i64 iVal;

  if( objc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " STMT column", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &col) ) return TCL_ERROR;

  iVal = sqlite3_column_int64(pStmt, col);
  Tcl_SetObjResult(interp, Tcl_NewWideIntObj(iVal));
  return TCL_OK;
}

/*
** Usage: sqlite3_column_blob STMT column
*/
static int test_column_blob(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int col;

  int len;
  const void *pBlob;

  if( objc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " STMT column", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &col) ) return TCL_ERROR;

  len = sqlite3_column_bytes(pStmt, col);
  pBlob = sqlite3_column_blob(pStmt, col);
  Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(pBlob, len));
  return TCL_OK;
}

/*
** Usage: sqlite3_column_double STMT column
**
** Return the data in column 'column' of the current row cast as a double.
*/
static int test_column_double(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int col;
  double rVal;

  if( objc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " STMT column", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &col) ) return TCL_ERROR;

  rVal = sqlite3_column_double(pStmt, col);
  Tcl_SetObjResult(interp, Tcl_NewDoubleObj(rVal));
  return TCL_OK;
}

/*
** Usage: sqlite3_data_count STMT 
**
** Return the number of columns returned by the sql statement STMT.
*/
static int test_data_count(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " STMT column", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;

  Tcl_SetObjResult(interp, Tcl_NewIntObj(sqlite3_data_count(pStmt)));
  return TCL_OK;
}

/*
** Usage: sqlite3_column_text STMT column
**
** Usage: sqlite3_column_decltype STMT column
**
** Usage: sqlite3_column_name STMT column
*/
static int test_stmt_utf8(
  void * clientData,        /* Pointer to SQLite API function to be invoke */
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int col;
  const char *(*xFunc)(sqlite3_stmt*, int) = clientData;
  const char *zRet;

  if( objc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " STMT column", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &col) ) return TCL_ERROR;
  zRet = xFunc(pStmt, col);
  if( zRet ){
    Tcl_SetResult(interp, (char *)zRet, 0);
  }
  return TCL_OK;
}

static int test_global_recover(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#ifndef SQLITE_OMIT_GLOBALRECOVER
  int rc;
  if( objc!=1 ){
    Tcl_WrongNumArgs(interp, 1, objv, "");
    return TCL_ERROR;
  }
  rc = sqlite3_global_recover();
  Tcl_SetResult(interp, (char *)t1ErrorName(rc), TCL_STATIC);
#endif
  return TCL_OK;
}

/*
** Usage: sqlite3_column_text STMT column
**
** Usage: sqlite3_column_decltype STMT column
**
** Usage: sqlite3_column_name STMT column
*/
static int test_stmt_utf16(
  void * clientData,     /* Pointer to SQLite API function to be invoked */
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#ifndef SQLITE_OMIT_UTF16
  sqlite3_stmt *pStmt;
  int col;
  Tcl_Obj *pRet;
  const void *zName16;
  const void *(*xFunc)(sqlite3_stmt*, int) = clientData;

  if( objc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " STMT column", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &col) ) return TCL_ERROR;

  zName16 = xFunc(pStmt, col);
  if( zName16 ){
    pRet = Tcl_NewByteArrayObj(zName16, sqlite3Utf16ByteLen(zName16, -1)+2);
    Tcl_SetObjResult(interp, pRet);
  }
#endif /* SQLITE_OMIT_UTF16 */

  return TCL_OK;
}

/*
** Usage: sqlite3_column_int STMT column
**
** Usage: sqlite3_column_bytes STMT column
**
** Usage: sqlite3_column_bytes16 STMT column
**
*/
static int test_stmt_int(
  void * clientData,    /* Pointer to SQLite API function to be invoked */
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_stmt *pStmt;
  int col;
  int (*xFunc)(sqlite3_stmt*, int) = clientData;

  if( objc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " STMT column", 0);
    return TCL_ERROR;
  }

  if( getStmtPointer(interp, Tcl_GetString(objv[1]), &pStmt) ) return TCL_ERROR;
  if( Tcl_GetIntFromObj(interp, objv[2], &col) ) return TCL_ERROR;

  Tcl_SetObjResult(interp, Tcl_NewIntObj(xFunc(pStmt, col)));
  return TCL_OK;
}

#ifndef SQLITE_OMIT_DISKIO
#if 0
/*
** Usage:  sqlite3OsOpenReadWrite <filename>
*/
static int test_sqlite3OsOpenReadWrite(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_file *pFile;
  int rc;
  int dummy;
  char zBuf[100];

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " filename", 0);
    return TCL_ERROR;
  }

  rc = sqlite3OsOpenReadWrite(Tcl_GetString(objv[1]), &pFile, &dummy);
  if( rc!=SQLITE_OK ){
    Tcl_SetResult(interp, (char *)t1ErrorName(rc), TCL_STATIC);
    return TCL_ERROR;
  }
  sqlite3TestMakePointerStr(interp, zBuf, pFile);
  Tcl_SetResult(interp, zBuf, 0);
  return TCL_ERROR;
}

/*
** Usage:  sqlite3OsClose <file handle>
*/
static int test_sqlite3OsClose(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_file *pFile;
  int rc;

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " filehandle", 0);
    return TCL_ERROR;
  }

  if( getFilePointer(interp, Tcl_GetString(objv[1]), &pFile) ){
    return TCL_ERROR;
  }
  rc = sqlite3OsClose(&pFile);
  if( rc!=SQLITE_OK ){
    Tcl_SetResult(interp, (char *)t1ErrorName(rc), TCL_STATIC);
    return TCL_ERROR;
  }
  return TCL_OK;
}

/*
** Usage:  sqlite3OsLock <file handle> <locktype>
*/
static int test_sqlite3OsLock(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_file * pFile;
  int rc;

  if( objc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
        Tcl_GetString(objv[0]), 
        " filehandle (SHARED|RESERVED|PENDING|EXCLUSIVE)", 0);
    return TCL_ERROR;
  }

  if( getFilePointer(interp, Tcl_GetString(objv[1]), &pFile) ){
    return TCL_ERROR;
  }

  if( 0==strcmp("SHARED", Tcl_GetString(objv[2])) ){
    rc = sqlite3OsLock(pFile, SHARED_LOCK);
  }
  else if( 0==strcmp("RESERVED", Tcl_GetString(objv[2])) ){
    rc = sqlite3OsLock(pFile, RESERVED_LOCK);
  }
  else if( 0==strcmp("PENDING", Tcl_GetString(objv[2])) ){
    rc = sqlite3OsLock(pFile, PENDING_LOCK);
  }
  else if( 0==strcmp("EXCLUSIVE", Tcl_GetString(objv[2])) ){
    rc = sqlite3OsLock(pFile, EXCLUSIVE_LOCK);
  }else{
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
        Tcl_GetString(objv[0]), 
        " filehandle (SHARED|RESERVED|PENDING|EXCLUSIVE)", 0);
    return TCL_ERROR;
  }

  if( rc!=SQLITE_OK ){
    Tcl_SetResult(interp, (char *)t1ErrorName(rc), TCL_STATIC);
    return TCL_ERROR;
  }
  return TCL_OK;
}

/*
** Usage:  sqlite3OsUnlock <file handle>
*/
static int test_sqlite3OsUnlock(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_file * pFile;
  int rc;

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", 
       Tcl_GetString(objv[0]), " filehandle", 0);
    return TCL_ERROR;
  }

  if( getFilePointer(interp, Tcl_GetString(objv[1]), &pFile) ){
    return TCL_ERROR;
  }
  rc = sqlite3OsUnlock(pFile, NO_LOCK);
  if( rc!=SQLITE_OK ){
    Tcl_SetResult(interp, (char *)t1ErrorName(rc), TCL_STATIC);
    return TCL_ERROR;
  }
  return TCL_OK;
}

/*
** Usage:  sqlite3OsTempFileName
*/
static int test_sqlite3OsTempFileName(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  char zFile[SQLITE_TEMPNAME_SIZE];
  int rc;

  rc = sqlite3OsTempFileName(zFile);
  if( rc!=SQLITE_OK ){
    Tcl_SetResult(interp, (char *)t1ErrorName(rc), TCL_STATIC);
    return TCL_ERROR;
  }
  Tcl_AppendResult(interp, zFile, 0);
  return TCL_OK;
}
#endif
#endif

/*
** Usage:  sqlite_set_magic  DB  MAGIC-NUMBER
**
** Set the db->magic value.  This is used to test error recovery logic.
*/
static int sqlite_set_magic(
  void * clientData,
  Tcl_Interp *interp,
  int argc,
  char **argv
){
  sqlite3 *db;
  if( argc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
         " DB MAGIC", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  if( strcmp(argv[2], "SQLITE_MAGIC_OPEN")==0 ){
    db->magic = SQLITE_MAGIC_OPEN;
  }else if( strcmp(argv[2], "SQLITE_MAGIC_CLOSED")==0 ){
    db->magic = SQLITE_MAGIC_CLOSED;
  }else if( strcmp(argv[2], "SQLITE_MAGIC_BUSY")==0 ){
    db->magic = SQLITE_MAGIC_BUSY;
  }else if( strcmp(argv[2], "SQLITE_MAGIC_ERROR")==0 ){
    db->magic = SQLITE_MAGIC_ERROR;
  }else if( Tcl_GetInt(interp, argv[2], &db->magic) ){
    return TCL_ERROR;
  }
  return TCL_OK;
}

/*
** Usage:  sqlite3_interrupt  DB 
**
** Trigger an interrupt on DB
*/
static int test_interrupt(
  void * clientData,
  Tcl_Interp *interp,
  int argc,
  char **argv
){
  sqlite3 *db;
  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;
  sqlite3_interrupt(db);
  return TCL_OK;
}

static u8 *sqlite3_stack_baseline = 0;

/*
** Fill the stack with a known bitpattern.
*/
static void prepStack(void){
  int i;
  u32 bigBuf[65536];
  for(i=0; i<sizeof(bigBuf); i++) bigBuf[i] = 0xdeadbeef;
  sqlite3_stack_baseline = (u8*)&bigBuf[65536];
}

/*
** Get the current stack depth.  Used for debugging only.
*/
u64 sqlite3StackDepth(void){
  u8 x;
  return (u64)(sqlite3_stack_baseline - &x);
}

/*
** Usage:  sqlite3_stack_used DB SQL
**
** Try to measure the amount of stack space used by a call to sqlite3_exec
*/
static int test_stack_used(
  void * clientData,
  Tcl_Interp *interp,
  int argc,
  char **argv
){
  sqlite3 *db;
  int i;
  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;
  prepStack();
  (void)sqlite3_exec(db, argv[2], 0, 0, 0);
  for(i=65535; i>=0 && ((u32*)sqlite3_stack_baseline)[-i]==0xdeadbeef; i--){}
  Tcl_SetObjResult(interp, Tcl_NewIntObj(i*4));
  return TCL_OK;
}

/*
** Usage: sqlite_delete_function DB function-name
**
** Delete the user function 'function-name' from database handle DB. It
** is assumed that the user function was created as UTF8, any number of
** arguments (the way the TCL interface does it).
*/
static int delete_function(
  void * clientData,
  Tcl_Interp *interp,
  int argc,
  char **argv
){
  int rc;
  sqlite3 *db;
  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, SQLITE_UTF8, 0, 0, 0, 0);
  Tcl_SetResult(interp, (char *)t1ErrorName(rc), TCL_STATIC);
  return TCL_OK;
}

/*
** Usage: sqlite_delete_collation DB collation-name
**
** Delete the collation sequence 'collation-name' from database handle 
** DB. It is assumed that the collation sequence was created as UTF8 (the 
** way the TCL interface does it).
*/
static int delete_collation(
  void * clientData,
  Tcl_Interp *interp,
  int argc,
  char **argv
){
  int rc;
  sqlite3 *db;
  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_collation(db, argv[2], SQLITE_UTF8, 0, 0);
  Tcl_SetResult(interp, (char *)t1ErrorName(rc), TCL_STATIC);
  return TCL_OK;
}

/*
** Usage: sqlite3_get_autocommit DB
**
** Return true if the database DB is currently in auto-commit mode.
** Return false if not.
*/
static int get_autocommit(
  void * clientData,
  Tcl_Interp *interp,
  int argc,
  char **argv
){
  char zBuf[30];
  sqlite3 *db;
  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_get_autocommit(db));
  Tcl_AppendResult(interp, zBuf, 0);
  return TCL_OK;
}

/*
** Usage: sqlite3_busy_timeout DB MS
**
** Set the busy timeout.  This is more easily done using the timeout
** method of the TCL interface.  But we need a way to test the case
** where it returns SQLITE_MISUSE.
*/
static int test_busy_timeout(
  void * clientData,
  Tcl_Interp *interp,
  int argc,
  char **argv
){
  int rc, ms;
  sqlite3 *db;
  if( argc!=3 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], 
        " DB", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, argv[1], &db) ) return TCL_ERROR;
  if( Tcl_GetInt(interp, argv[2], &ms) ) return TCL_ERROR;
  rc = sqlite3_busy_timeout(db, ms);
  Tcl_AppendResult(interp, sqlite3TestErrorName(rc), 0);
  return TCL_OK;
}

/*
** Usage:  tcl_variable_type VARIABLENAME
**
** Return the name of the internal representation for the
** value of the given variable.
*/
static int tcl_variable_type(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  Tcl_Obj *pVar;
  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "VARIABLE");
    return TCL_ERROR;
  }
  pVar = Tcl_GetVar2Ex(interp, Tcl_GetString(objv[1]), 0, TCL_LEAVE_ERR_MSG);
  if( pVar==0 ) return TCL_ERROR;
  if( pVar->typePtr ){
    Tcl_SetObjResult(interp, Tcl_NewStringObj(pVar->typePtr->name, -1));
  }
  return TCL_OK;
}

/*
** Usage:  sqlite3_release_memory ?N?
**
** Attempt to release memory currently held but not actually required.
** The integer N is the number of bytes we are trying to release.  The 
** return value is the amount of memory actually released.
*/
static int test_release_memory(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
#if defined(SQLITE_ENABLE_MEMORY_MANAGEMENT) && !defined(SQLITE_OMIT_DISKIO)
  int N;
  int amt;
  if( objc!=1 && objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "?N?");
    return TCL_ERROR;
  }
  if( objc==2 ){
    if( Tcl_GetIntFromObj(interp, objv[1], &N) ) return TCL_ERROR;
  }else{
    N = -1;
  }
  amt = sqlite3_release_memory(N);
  Tcl_SetObjResult(interp, Tcl_NewIntObj(amt));
#endif
  return TCL_OK;
}

/*
** Usage:  sqlite3_soft_heap_limit ?N?
**
** Query or set the soft heap limit for the current thread.  The
** limit is only changed if the N is present.  The previous limit
** is returned.
*/
static int test_soft_heap_limit(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  static int softHeapLimit = 0;
  int amt;
  if( objc!=1 && objc!=2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "?N?");
    return TCL_ERROR;
  }
  amt = softHeapLimit;
  if( objc==2 ){
    int N;
    if( Tcl_GetIntFromObj(interp, objv[1], &N) ) return TCL_ERROR;
    sqlite3_soft_heap_limit(N);
    softHeapLimit = N;
  }
  Tcl_SetObjResult(interp, Tcl_NewIntObj(amt));
  return TCL_OK;
}

/*
** Usage:   sqlite3_thread_cleanup
**
** Call the sqlite3_thread_cleanup API.
*/
static int test_thread_cleanup(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_thread_cleanup();
  return TCL_OK;
}


/*
** Usage:   sqlite3_pager_refcounts  DB
**
** Return a list of numbers which are the PagerRefcount for all
** pagers on each database connection.
*/
static int test_pager_refcounts(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3 *db;
  int i;
  int v, *a;
  Tcl_Obj *pResult;

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " DB", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  pResult = Tcl_NewObj();
  for(i=0; i<db->nDb; i++){
    if( db->aDb[i].pBt==0 ){
      v = -1;
    }else{
      sqlite3_mutex_enter(db->mutex);
      a = sqlite3PagerStats(sqlite3BtreePager(db->aDb[i].pBt));
      v = a[0];
      sqlite3_mutex_leave(db->mutex);
    }
    Tcl_ListObjAppendElement(0, pResult, Tcl_NewIntObj(v));
  }
  Tcl_SetObjResult(interp, pResult);
  return TCL_OK;
}


/*
** tclcmd:   working_64bit_int
**
** Some TCL builds (ex: cygwin) do not support 64-bit integers.  This
** leads to a number of test failures.  The present command checks the
** TCL build to see whether or not it supports 64-bit integers.  It
** returns TRUE if it does and FALSE if not.
**
** This command is used to warn users that their TCL build is defective
** and that the errors they are seeing in the test scripts might be
** a result of their defective TCL rather than problems in SQLite.
*/
static int working_64bit_int(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  Tcl_Obj *pTestObj;
  int working = 0;

  pTestObj = Tcl_NewWideIntObj(1000000*(i64)1234567890);
  working = strcmp(Tcl_GetString(pTestObj), "1234567890000000")==0;
  Tcl_DecrRefCount(pTestObj);
  Tcl_SetObjResult(interp, Tcl_NewBooleanObj(working));
  return TCL_OK;
}


/*
** tclcmd:   vfs_unlink_test
**
** This TCL command unregisters the primary VFS and then registers
** it back again.  This is used to test the ability to register a
** VFS when none are previously registered, and the ability to 
** unregister the only available VFS.  Ticket #2738
*/
static int vfs_unlink_test(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  int i;
  sqlite3_vfs *pMain;
  sqlite3_vfs *apVfs[20];
  sqlite3_vfs one, two;

  sqlite3_vfs_unregister(0);   /* Unregister of NULL is harmless */
  one.zName = "__one";
  two.zName = "__two";

  /* Calling sqlite3_vfs_register with 2nd argument of 0 does not
  ** change the default VFS
  */
  pMain = sqlite3_vfs_find(0);
  sqlite3_vfs_register(&one, 0);
  assert( pMain==0 || pMain==sqlite3_vfs_find(0) );
  sqlite3_vfs_register(&two, 0);
  assert( pMain==0 || pMain==sqlite3_vfs_find(0) );

  /* We can find a VFS by its name */
  assert( sqlite3_vfs_find("__one")==&one );
  assert( sqlite3_vfs_find("__two")==&two );

  /* Calling sqlite_vfs_register with non-zero second parameter changes the
  ** default VFS, even if the 1st parameter is an existig VFS that is
  ** previously registered as the non-default.
  */
  sqlite3_vfs_register(&one, 1);
  assert( sqlite3_vfs_find("__one")==&one );
  assert( sqlite3_vfs_find("__two")==&two );
  assert( sqlite3_vfs_find(0)==&one );
  sqlite3_vfs_register(&two, 1);
  assert( sqlite3_vfs_find("__one")==&one );
  assert( sqlite3_vfs_find("__two")==&two );
  assert( sqlite3_vfs_find(0)==&two );
  if( pMain ){
    sqlite3_vfs_register(pMain, 1);
    assert( sqlite3_vfs_find("__one")==&one );
    assert( sqlite3_vfs_find("__two")==&two );
    assert( sqlite3_vfs_find(0)==pMain );
  }
  
  /* Unlink the default VFS.  Repeat until there are no more VFSes
  ** registered.
  */
  for(i=0; i<sizeof(apVfs)/sizeof(apVfs[0]); i++){
    apVfs[i] = sqlite3_vfs_find(0);
    if( apVfs[i] ){
      assert( apVfs[i]==sqlite3_vfs_find(apVfs[i]->zName) );
      sqlite3_vfs_unregister(apVfs[i]);
      assert( 0==sqlite3_vfs_find(apVfs[i]->zName) );
    }
  }
  assert( 0==sqlite3_vfs_find(0) );

  /* Relink all VFSes in reverse order. */  
  for(i=sizeof(apVfs)/sizeof(apVfs[0])-1; i>=0; i--){
    if( apVfs[i] ){
      sqlite3_vfs_register(apVfs[i], 1);
      assert( apVfs[i]==sqlite3_vfs_find(0) );
      assert( apVfs[i]==sqlite3_vfs_find(apVfs[i]->zName) );
    }
  }

  /* Unregister out sample VFSes. */
  sqlite3_vfs_unregister(&one);
  sqlite3_vfs_unregister(&two);

  /* Unregistering a VFS that is not currently registered is harmless */
  sqlite3_vfs_unregister(&one);
  sqlite3_vfs_unregister(&two);
  assert( sqlite3_vfs_find("__one")==0 );
  assert( sqlite3_vfs_find("__two")==0 );

  /* We should be left with the original default VFS back as the
  ** original */
  assert( sqlite3_vfs_find(0)==pMain );

  return TCL_OK;
}

/*
** tclcmd:   file_control_test DB
**
** This TCL command runs the sqlite3_file_control interface and
** verifies correct operation of the same.
*/
static int file_control_test(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  int iArg = 0;
  sqlite3 *db;
  int rc;

  if( objc!=2 ){
    Tcl_AppendResult(interp, "wrong # args: should be \"",
        Tcl_GetStringFromObj(objv[0], 0), " DB", 0);
    return TCL_ERROR;
  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ) return TCL_ERROR;
  rc = sqlite3_file_control(db, 0, 0, &iArg);
  assert( rc==SQLITE_ERROR );
  rc = sqlite3_file_control(db, "notadatabase", SQLITE_FCNTL_LOCKSTATE, &iArg);
  assert( rc==SQLITE_ERROR );
  rc = sqlite3_file_control(db, "main", -1, &iArg);
  assert( rc==SQLITE_ERROR );
  rc = sqlite3_file_control(db, "temp", -1, &iArg);
  assert( rc==SQLITE_ERROR );
  return TCL_OK;  
}

/*
** tclcmd:  save_prng_state
*/
static int save_prng_state(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  extern void sqlite3SavePrngState(void);
  sqlite3SavePrngState();
  return TCL_OK;
}
/*
** tclcmd:  restore_prng_state
*/
static int restore_prng_state(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  extern void sqlite3RestorePrngState(void);
  sqlite3RestorePrngState();
  return TCL_OK;
}
/*
** tclcmd:  reset_prng_state
*/
static int reset_prng_state(
  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
  int objc,              /* Number of arguments */
  Tcl_Obj *CONST objv[]  /* Command arguments */
){
  extern void sqlite3ResetPrngState(void);
  sqlite3ResetPrngState();
  return TCL_OK;
}


/*
** 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_sort_count;
  extern int sqlite3_current_time;
  extern int sqlite3_max_blobsize;
  extern int sqlite3BtreeSharedCacheReport(void*,
                                          Tcl_Interp*,int,Tcl_Obj*CONST*);
  static struct {
     char *zName;
     Tcl_CmdProc *xProc;
  } aCmd[] = {
     { "db_enter",                      (Tcl_CmdProc*)db_enter               },
     { "db_leave",                      (Tcl_CmdProc*)db_leave               },
     { "sqlite3_mprintf_int",           (Tcl_CmdProc*)sqlite3_mprintf_int    },
     { "sqlite3_mprintf_int64",         (Tcl_CmdProc*)sqlite3_mprintf_int64  },
     { "sqlite3_mprintf_str",           (Tcl_CmdProc*)sqlite3_mprintf_str    },
     { "sqlite3_snprintf_str",          (Tcl_CmdProc*)sqlite3_snprintf_str   },
     { "sqlite3_mprintf_stronly",       (Tcl_CmdProc*)sqlite3_mprintf_stronly},
     { "sqlite3_mprintf_double",        (Tcl_CmdProc*)sqlite3_mprintf_double },
     { "sqlite3_mprintf_scaled",        (Tcl_CmdProc*)sqlite3_mprintf_scaled },
     { "sqlite3_mprintf_hexdouble",   (Tcl_CmdProc*)sqlite3_mprintf_hexdouble},
     { "sqlite3_mprintf_z_test",        (Tcl_CmdProc*)test_mprintf_z        },
     { "sqlite3_mprintf_n_test",        (Tcl_CmdProc*)test_mprintf_n        },
     { "sqlite3_snprintf_int",          (Tcl_CmdProc*)test_snprintf_int     },
     { "sqlite3_last_insert_rowid",     (Tcl_CmdProc*)test_last_rowid       },
     { "sqlite3_exec_printf",           (Tcl_CmdProc*)test_exec_printf      },
     { "sqlite3_exec",                  (Tcl_CmdProc*)test_exec             },
     { "sqlite3_exec_nr",               (Tcl_CmdProc*)test_exec_nr          },
     { "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_bind",                   (Tcl_CmdProc*)test_bind             },
     { "breakpoint",                    (Tcl_CmdProc*)test_breakpoint       },
     { "sqlite3_key",                   (Tcl_CmdProc*)test_key              },
     { "sqlite3_rekey",                 (Tcl_CmdProc*)test_rekey            },
     { "sqlite_set_magic",              (Tcl_CmdProc*)sqlite_set_magic      },
     { "sqlite3_interrupt",             (Tcl_CmdProc*)test_interrupt        },
     { "sqlite_delete_function",        (Tcl_CmdProc*)delete_function       },
     { "sqlite_delete_collation",       (Tcl_CmdProc*)delete_collation      },
     { "sqlite3_get_autocommit",        (Tcl_CmdProc*)get_autocommit        },
     { "sqlite3_stack_used",            (Tcl_CmdProc*)test_stack_used       },
     { "sqlite3_busy_timeout",          (Tcl_CmdProc*)test_busy_timeout     },
     { "printf",                        (Tcl_CmdProc*)test_printf           },
     { "sqlite3_io_trace",              (Tcl_CmdProc*)test_io_trace         },
  };
  static struct {
     char *zName;
     Tcl_ObjCmdProc *xProc;
     void *clientData;
  } aObjCmd[] = {
     { "sqlite3_connection_pointer",    get_sqlite_pointer, 0 },
     { "sqlite3_bind_int",              test_bind_int,      0 },
     { "sqlite3_bind_zeroblob",         test_bind_zeroblob, 0 },
     { "sqlite3_bind_int64",            test_bind_int64,    0 },
     { "sqlite3_bind_double",           test_bind_double,   0 },
     { "sqlite3_bind_null",             test_bind_null     ,0 },
     { "sqlite3_bind_text",             test_bind_text     ,0 },
     { "sqlite3_bind_text16",           test_bind_text16   ,0 },
     { "sqlite3_bind_blob",             test_bind_blob     ,0 },
     { "sqlite3_bind_parameter_count",  test_bind_parameter_count, 0},
     { "sqlite3_bind_parameter_name",   test_bind_parameter_name,  0},
     { "sqlite3_bind_parameter_index",  test_bind_parameter_index, 0},
     { "sqlite3_clear_bindings",        test_clear_bindings, 0},
     { "sqlite3_sleep",                 test_sleep,          0},
     { "sqlite3_errcode",               test_errcode       ,0 },
     { "sqlite3_errmsg",                test_errmsg        ,0 },
     { "sqlite3_errmsg16",              test_errmsg16      ,0 },
     { "sqlite3_open",                  test_open          ,0 },
     { "sqlite3_open16",                test_open16        ,0 },
     { "sqlite3_complete16",            test_complete16    ,0 },

     { "sqlite3_prepare",               test_prepare       ,0 },
     { "sqlite3_prepare16",             test_prepare16     ,0 },
     { "sqlite3_prepare_v2",            test_prepare_v2    ,0 },
     { "sqlite3_prepare16_v2",          test_prepare16_v2  ,0 },
     { "sqlite3_finalize",              test_finalize      ,0 },
     { "sqlite3_reset",                 test_reset         ,0 },
     { "sqlite3_expired",               test_expired       ,0 },
     { "sqlite3_transfer_bindings",     test_transfer_bind ,0 },
     { "sqlite3_changes",               test_changes       ,0 },
     { "sqlite3_step",                  test_step          ,0 },

     { "sqlite3_release_memory",        test_release_memory,     0},
     { "sqlite3_soft_heap_limit",       test_soft_heap_limit,    0},
     { "sqlite3_thread_cleanup",        test_thread_cleanup,     0},
     { "sqlite3_pager_refcounts",       test_pager_refcounts,    0},

     { "sqlite3_load_extension",        test_load_extension,     0},
     { "sqlite3_enable_load_extension", test_enable_load,        0},
     { "sqlite3_extended_result_codes", test_extended_result_codes, 0},

     { "save_prng_state",               save_prng_state,    0 },
     { "restore_prng_state",            restore_prng_state, 0 },
     { "reset_prng_state",              reset_prng_state,   0 },

     /* sqlite3_column_*() API */
     { "sqlite3_column_count",          test_column_count  ,0 },
     { "sqlite3_data_count",            test_data_count    ,0 },
     { "sqlite3_column_type",           test_column_type   ,0 },
     { "sqlite3_column_blob",           test_column_blob   ,0 },
     { "sqlite3_column_double",         test_column_double ,0 },
     { "sqlite3_column_int64",          test_column_int64  ,0 },
     { "sqlite3_column_text",       test_stmt_utf8,  sqlite3_column_text      },
     { "sqlite3_column_decltype",   test_stmt_utf8,  sqlite3_column_decltype  },
     { "sqlite3_column_name",       test_stmt_utf8,  sqlite3_column_name      },
     { "sqlite3_column_int",        test_stmt_int,   sqlite3_column_int       },
     { "sqlite3_column_bytes",      test_stmt_int,   sqlite3_column_bytes     },
#ifdef SQLITE_ENABLE_COLUMN_METADATA
{ "sqlite3_column_database_name", test_stmt_utf8, sqlite3_column_database_name},
{ "sqlite3_column_table_name", test_stmt_utf8, sqlite3_column_table_name},
{ "sqlite3_column_origin_name", test_stmt_utf8, sqlite3_column_origin_name},
#endif

#ifndef SQLITE_OMIT_UTF16
     { "sqlite3_column_bytes16",    test_stmt_int,   sqlite3_column_bytes16   },
     { "sqlite3_column_text16",     test_stmt_utf16, sqlite3_column_text16    },
     { "sqlite3_column_decltype16", test_stmt_utf16, sqlite3_column_decltype16},
     { "sqlite3_column_name16",     test_stmt_utf16, sqlite3_column_name16    },
     { "add_alignment_test_collations", add_alignment_test_collations, 0      },
#ifdef SQLITE_ENABLE_COLUMN_METADATA
{"sqlite3_column_database_name16",
  test_stmt_utf16, sqlite3_column_database_name16},
{"sqlite3_column_table_name16", test_stmt_utf16, sqlite3_column_table_name16},
{"sqlite3_column_origin_name16", test_stmt_utf16, sqlite3_column_origin_name16},
#endif
#endif
     { "sqlite3_create_collation_v2", test_create_collation_v2, 0 },
     { "sqlite3_global_recover",     test_global_recover, 0   },
     { "working_64bit_int",          working_64bit_int,   0   },
     { "vfs_unlink_test",            vfs_unlink_test,     0   },
     { "file_control_test",          file_control_test,   0   },

     /* Functions from os.h */
#ifndef SQLITE_OMIT_DISKIO
#if 0
     { "sqlite3OsOpenReadWrite",test_sqlite3OsOpenReadWrite, 0 },
     { "sqlite3OsClose",        test_sqlite3OsClose, 0 },
     { "sqlite3OsLock",         test_sqlite3OsLock, 0 },
     { "sqlite3OsTempFileName", test_sqlite3OsTempFileName, 0 },
   
     /* Custom test interfaces */
     { "sqlite3OsUnlock",         test_sqlite3OsUnlock, 0    },
#endif
#endif
#ifndef SQLITE_OMIT_UTF16
     { "add_test_collate",        test_collate, 0            },
     { "add_test_collate_needed", test_collate_needed, 0     },
     { "add_test_function",       test_function, 0           },
#endif
     { "sqlite3_test_errstr",     test_errstr, 0             },
     { "tcl_variable_type",       tcl_variable_type, 0       },
#ifndef SQLITE_OMIT_SHARED_CACHE
     { "sqlite3_enable_shared_cache", test_enable_shared, 0  },
     { "sqlite3_shared_cache_report", sqlite3BtreeSharedCacheReport, 0},
#endif
     { "sqlite3_libversion_number", test_libversion_number, 0  },
#ifdef SQLITE_ENABLE_COLUMN_METADATA
     { "sqlite3_table_column_metadata", test_table_column_metadata, 0  },
#endif
#ifndef SQLITE_OMIT_INCRBLOB
     { "sqlite3_blob_read",  test_blob_read, 0  },
     { "sqlite3_blob_write", test_blob_write, 0  },
#endif
  };
  static int bitmask_size = sizeof(Bitmask)*8;
  int i;
  extern int sqlite3_sync_count, sqlite3_fullsync_count;
  extern int sqlite3_opentemp_count;
  extern int sqlite3_like_count;
  extern int sqlite3_xferopt_count;
  extern int sqlite3_pager_readdb_count;
  extern int sqlite3_pager_writedb_count;
  extern int sqlite3_pager_writej_count;
  extern int sqlite3_pager_pgfree_count;
#if OS_UNIX && defined(SQLITE_TEST) && SQLITE_THREADSAFE
  extern int threadsOverrideEachOthersLocks;
#endif
#if OS_WIN
  extern int sqlite3_os_type;
#endif
#ifdef SQLITE_DEBUG
  extern int sqlite3_where_trace;
  extern int sqlite3_os_trace;
  extern int sqlite3_vdbe_addop_trace;
#endif
#ifdef SQLITE_TEST
  extern int sqlite3_enable_in_opt;
  extern char sqlite3_query_plan[];
  static char *query_plan = sqlite3_query_plan;
#endif

  for(i=0; i<sizeof(aCmd)/sizeof(aCmd[0]); i++){
    Tcl_CreateCommand(interp, aCmd[i].zName, aCmd[i].xProc, 0, 0);
  }
  for(i=0; i<sizeof(aObjCmd)/sizeof(aObjCmd[0]); i++){
    Tcl_CreateObjCommand(interp, aObjCmd[i].zName, 
        aObjCmd[i].xProc, aObjCmd[i].clientData, 0);
  }
  Tcl_LinkVar(interp, "sqlite_search_count", 
      (char*)&sqlite3_search_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_sort_count", 
      (char*)&sqlite3_sort_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite3_max_blobsize", 
      (char*)&sqlite3_max_blobsize, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_like_count", 
      (char*)&sqlite3_like_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_interrupt_count", 
      (char*)&sqlite3_interrupt_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_open_file_count", 
      (char*)&sqlite3_open_file_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_current_time", 
      (char*)&sqlite3_current_time, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite3_xferopt_count",
      (char*)&sqlite3_xferopt_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite3_pager_readdb_count",
      (char*)&sqlite3_pager_readdb_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite3_pager_writedb_count",
      (char*)&sqlite3_pager_writedb_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite3_pager_writej_count",
      (char*)&sqlite3_pager_writej_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite3_pager_pgfree_count",
      (char*)&sqlite3_pager_pgfree_count, TCL_LINK_INT);
#ifndef SQLITE_OMIT_UTF16
  Tcl_LinkVar(interp, "unaligned_string_counter",
      (char*)&unaligned_string_counter, TCL_LINK_INT);
#endif
#if OS_UNIX && defined(SQLITE_TEST) && SQLITE_THREADSAFE
  Tcl_LinkVar(interp, "threadsOverrideEachOthersLocks",
      (char*)&threadsOverrideEachOthersLocks, TCL_LINK_INT);
#endif
#ifndef SQLITE_OMIT_UTF16
  Tcl_LinkVar(interp, "sqlite_last_needed_collation",
      (char*)&pzNeededCollation, TCL_LINK_STRING|TCL_LINK_READ_ONLY);
#endif
#if OS_WIN
  Tcl_LinkVar(interp, "sqlite_os_type",
      (char*)&sqlite3_os_type, TCL_LINK_INT);
#endif
#ifdef SQLITE_TEST
  Tcl_LinkVar(interp, "sqlite_query_plan",
      (char*)&query_plan, TCL_LINK_STRING|TCL_LINK_READ_ONLY);
#endif
#ifdef SQLITE_DEBUG
  Tcl_LinkVar(interp, "sqlite_addop_trace",
      (char*)&sqlite3_vdbe_addop_trace, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_where_trace",
      (char*)&sqlite3_where_trace, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_os_trace",
      (char*)&sqlite3_os_trace, TCL_LINK_INT);
#endif
#ifndef SQLITE_OMIT_DISKIO
  Tcl_LinkVar(interp, "sqlite_opentemp_count",
      (char*)&sqlite3_opentemp_count, TCL_LINK_INT);
#endif
  Tcl_LinkVar(interp, "sqlite_static_bind_value",
      (char*)&sqlite_static_bind_value, TCL_LINK_STRING);
  Tcl_LinkVar(interp, "sqlite_static_bind_nbyte",
      (char*)&sqlite_static_bind_nbyte, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_temp_directory",
      (char*)&sqlite3_temp_directory, TCL_LINK_STRING);
  Tcl_LinkVar(interp, "bitmask_size",
      (char*)&bitmask_size, TCL_LINK_INT|TCL_LINK_READ_ONLY);
  Tcl_LinkVar(interp, "sqlite_sync_count",
      (char*)&sqlite3_sync_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_fullsync_count",
      (char*)&sqlite3_fullsync_count, TCL_LINK_INT);
#ifdef SQLITE_TEST
  Tcl_LinkVar(interp, "sqlite_enable_in_opt",
      (char*)&sqlite3_enable_in_opt, TCL_LINK_INT);
#endif
  return TCL_OK;
}