SQLite

static void otaDeleteVfs(sqlite3ota *p){
  if( p->zVfsName ){
    sqlite3ota_destroy_vfs(p->zVfsName);
    p->zVfsName = 0;
  }
}




static sqlite3ota *otaOpen(
  const char *zTarget, 
  const char *zOta,
  const char *zState
){
  sqlite3ota *p;
  int nTarget = strlen(zTarget);
  int nOta = strlen(zOta);

    otaFreeState(pState);
  }

  return p;
}


/*
** Open and return a new OTA handle. 
*/
sqlite3ota *sqlite3ota_open_v2(
  const char *zDb, 
  const char *zOta, 
  const char *zState
){
  return otaOpen(zDb, zOta, zState);
}

/*
** Open and return a new OTA handle. 
*/
sqlite3ota *sqlite3ota_open(
  const char *zDb, 
  const char *zOta 
){
  return otaOpen(zDb, zOta, 0);
}

/*
** Return the database handle used by pOta.
*/
sqlite3 *sqlite3ota_db(sqlite3ota *pOta, int bOta){
  sqlite3 *db = 0;
  if( pOta ){
    db = (bOta ? pOta->dbOta : pOta->dbMain);

** Argument zTarget is the path to the target database. Argument zOta is
** the path to the OTA database. Each call to this function must be matched
** by a call to sqlite3ota_close(). When opening the databases, OTA passes
** the SQLITE_CONFIG_URI flag to sqlite3_open_v2(). So if either zTarget
** or zOta begin with "file:", it will be interpreted as an SQLite 
** database URI, not a regular file name.
**














** By default, OTA uses the default VFS to access the files on disk. To
** use a VFS other than the default, an SQLite "file:" URI containing a
** "vfs=..." option may be passed as the zTarget option.
**
** IMPORTANT NOTE FOR ZIPVFS USERS: The OTA extension works with all of
** SQLite's built-in VFSs, including the multiplexor VFS. However it does
** not work out of the box with zipvfs. Refer to the comment describing
** the zipvfs_create_vfs() API below for details on using OTA with zipvfs.
*/
sqlite3ota *sqlite3ota_open(const char *zTarget, const char *zOta);

/*
** Open an OTA handle with an auxiliary state file.
**
** This API is similar to sqlite3ota_open(), except that it allows the user 
** to specify a separate SQLite database in which to store the OTA update 
** state.
**
** While executing, the OTA extension usually stores the current state 
** of the update (how many rows have been updated, which indexes are yet
** to be updated etc.) within the OTA database itself. This can be 
** convenient, as it means that the OTA application does not need to
** organize removing a separate state file after the update is concluded.
** However, it can also be inconvenient - for example if the OTA update
** database is sto be stored on a read-only media.
**
** If an OTA update started using a handle opened with this function is
** suspended, the application must use this function to resume it, and 
** must pass the same zState argument each time the update is resumed.
** Attempting to resume an sqlite3ota_open_v2() update using sqlite3ota_open(),
** or with a call to sqlite3ota_open_v2() specifying a different zState
** argument leads to undefined behaviour.
**
** Once the OTA update is finished, the OTA extension does not 
** automatically remove the zState database file, even if it created it.
*/
sqlite3ota *sqlite3ota_open_v2(
  const char *zTarget,
  const char *zOta,
  const char *zState
);

/*
** Internally, each OTA connection uses a separate SQLite database 
** connection to access the target and ota update databases. This

  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3ota *pOta = 0;
  const char *zCmd;
  const char *zTarget;
  const char *zOta;


  if( objc!=4 && objc!=5 ){
    Tcl_WrongNumArgs(interp, 1, objv, "NAME TARGET-DB OTA-DB ?STATE-DB?");
    return TCL_ERROR;
  }
  zCmd = Tcl_GetString(objv[1]);
  zTarget = Tcl_GetString(objv[2]);
  zOta = Tcl_GetString(objv[3]);


  if( objc==4 ){
    pOta = sqlite3ota_open(zTarget, zOta);
  }else{
    const char *zStateDb = Tcl_GetString(objv[4]);
    pOta = sqlite3ota_open_v2(zTarget, zOta, zStateDb);
  }
  Tcl_CreateObjCommand(interp, zCmd, test_sqlite3ota_cmd, (ClientData)pOta, 0);
  Tcl_SetObjResult(interp, objv[1]);
  return TCL_OK;
}

/*
** Tclcmd: sqlite3ota_create_vfs ?-default? NAME PARENT