Move bundled copy of sqlite one level deeper to better separate it...

third_party/sqlite/src/main.c

Index: third_party/sqlite/src/main.c
===================================================================
--- third_party/sqlite/src/main.c	(revision 56608)
+++ third_party/sqlite/src/main.c	(working copy)
@@ -1,2288 +0,0 @@
-/*
-** 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.
-**
-*************************************************************************
-** Main file for the SQLite library.  The routines in this file
-** implement the programmer interface to the library.  Routines in
-** other files are for internal use by SQLite and should not be
-** accessed by users of the library.
-*/
-#include "sqliteInt.h"
-
-#ifdef SQLITE_ENABLE_FTS3
-# include "../../ext/fts3/fts3.h"
-#endif
-#ifdef SQLITE_ENABLE_RTREE
-# include "rtree.h"
-#endif
-#ifdef SQLITE_ENABLE_ICU
-# include "sqliteicu.h"
-#endif
-
-/*
-** The version of the library
-*/
-#ifndef SQLITE_AMALGAMATION
-const char sqlite3_version[] = SQLITE_VERSION;
-#endif
-const char *sqlite3_libversion(void){ return sqlite3_version; }
-const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
-int sqlite3_libversion_number(void){ return SQLITE_VERSION_NUMBER; }
-int sqlite3_threadsafe(void){ return SQLITE_THREADSAFE; }
-
-#if !defined(SQLITE_OMIT_TRACE) && defined(SQLITE_ENABLE_IOTRACE)
-/*
-** If the following function pointer is not NULL and if
-** SQLITE_ENABLE_IOTRACE is enabled, then messages describing
-** I/O active are written using this function.  These messages
-** are intended for debugging activity only.
-*/
-void (*sqlite3IoTrace)(const char*, ...) = 0;
-#endif
-
-/*
-** If the following global variable points to a string which is the
-** name of a directory, then that directory will be used to store
-** temporary files.
-**
-** See also the "PRAGMA temp_store_directory" SQL command.
-*/
-char *sqlite3_temp_directory = 0;
-
-/*
-** Initialize SQLite.  
-**
-** This routine must be called to initialize the memory allocation,
-** VFS, and mutex subsystems prior to doing any serious work with
-** SQLite.  But as long as you do not compile with SQLITE_OMIT_AUTOINIT
-** this routine will be called automatically by key routines such as
-** sqlite3_open().  
-**
-** This routine is a no-op except on its very first call for the process,
-** or for the first call after a call to sqlite3_shutdown.
-**
-** The first thread to call this routine runs the initialization to
-** completion.  If subsequent threads call this routine before the first
-** thread has finished the initialization process, then the subsequent
-** threads must block until the first thread finishes with the initialization.
-**
-** The first thread might call this routine recursively.  Recursive
-** calls to this routine should not block, of course.  Otherwise the
-** initialization process would never complete.
-**
-** Let X be the first thread to enter this routine.  Let Y be some other
-** thread.  Then while the initial invocation of this routine by X is
-** incomplete, it is required that:
-**
-**    *  Calls to this routine from Y must block until the outer-most
-**       call by X completes.
-**
-**    *  Recursive calls to this routine from thread X return immediately
-**       without blocking.
-*/
-int sqlite3_initialize(void){
-  sqlite3_mutex *pMaster;                      /* The main static mutex */
-  int rc;                                      /* Result code */
-
-#ifdef SQLITE_OMIT_WSD
-  rc = sqlite3_wsd_init(4096, 24);
-  if( rc!=SQLITE_OK ){
-    return rc;
-  }
-#endif
-
-  /* If SQLite is already completely initialized, then this call
-  ** to sqlite3_initialize() should be a no-op.  But the initialization
-  ** must be complete.  So isInit must not be set until the very end
-  ** of this routine.
-  */
-  if( sqlite3GlobalConfig.isInit ) return SQLITE_OK;
-
-  /* Make sure the mutex subsystem is initialized.  If unable to 
-  ** initialize the mutex subsystem, return early with the error.
-  ** If the system is so sick that we are unable to allocate a mutex,
-  ** there is not much SQLite is going to be able to do.
-  **
-  ** The mutex subsystem must take care of serializing its own
-  ** initialization.
-  */
-  rc = sqlite3MutexInit();
-  if( rc ) return rc;
-
-  /* Initialize the malloc() system and the recursive pInitMutex mutex.
-  ** This operation is protected by the STATIC_MASTER mutex.  Note that
-  ** MutexAlloc() is called for a static mutex prior to initializing the
-  ** malloc subsystem - this implies that the allocation of a static
-  ** mutex must not require support from the malloc subsystem.
-  */
-  pMaster = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
-  sqlite3_mutex_enter(pMaster);
-  sqlite3GlobalConfig.isMutexInit = 1;
-  if( !sqlite3GlobalConfig.isMallocInit ){
-    rc = sqlite3MallocInit();
-  }
-  if( rc==SQLITE_OK ){
-    sqlite3GlobalConfig.isMallocInit = 1;
-    if( !sqlite3GlobalConfig.pInitMutex ){
-      sqlite3GlobalConfig.pInitMutex =
-           sqlite3MutexAlloc(SQLITE_MUTEX_RECURSIVE);
-      if( sqlite3GlobalConfig.bCoreMutex && !sqlite3GlobalConfig.pInitMutex ){
-        rc = SQLITE_NOMEM;
-      }
-    }
-  }
-  if( rc==SQLITE_OK ){
-    sqlite3GlobalConfig.nRefInitMutex++;
-  }
-  sqlite3_mutex_leave(pMaster);
-
-  /* If rc is not SQLITE_OK at this point, then either the malloc
-  ** subsystem could not be initialized or the system failed to allocate
-  ** the pInitMutex mutex. Return an error in either case.  */
-  if( rc!=SQLITE_OK ){
-    return rc;
-  }
-
-  /* Do the rest of the initialization under the recursive mutex so
-  ** that we will be able to handle recursive calls into
-  ** sqlite3_initialize().  The recursive calls normally come through
-  ** sqlite3_os_init() when it invokes sqlite3_vfs_register(), but other
-  ** recursive calls might also be possible.
-  */
-  sqlite3_mutex_enter(sqlite3GlobalConfig.pInitMutex);
-  if( sqlite3GlobalConfig.isInit==0 && sqlite3GlobalConfig.inProgress==0 ){
-    FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
-    sqlite3GlobalConfig.inProgress = 1;
-    memset(pHash, 0, sizeof(sqlite3GlobalFunctions));
-    sqlite3RegisterGlobalFunctions();
-    if( sqlite3GlobalConfig.isPCacheInit==0 ){
-      rc = sqlite3PcacheInitialize();
-    }
-    if( rc==SQLITE_OK ){
-      sqlite3GlobalConfig.isPCacheInit = 1;
-      rc = sqlite3OsInit();
-    }
-    if( rc==SQLITE_OK ){
-      sqlite3PCacheBufferSetup( sqlite3GlobalConfig.pPage, 
-          sqlite3GlobalConfig.szPage, sqlite3GlobalConfig.nPage);
-      sqlite3GlobalConfig.isInit = 1;
-    }
-    sqlite3GlobalConfig.inProgress = 0;
-  }
-  sqlite3_mutex_leave(sqlite3GlobalConfig.pInitMutex);
-
-  /* Go back under the static mutex and clean up the recursive
-  ** mutex to prevent a resource leak.
-  */
-  sqlite3_mutex_enter(pMaster);
-  sqlite3GlobalConfig.nRefInitMutex--;
-  if( sqlite3GlobalConfig.nRefInitMutex<=0 ){
-    assert( sqlite3GlobalConfig.nRefInitMutex==0 );
-    sqlite3_mutex_free(sqlite3GlobalConfig.pInitMutex);
-    sqlite3GlobalConfig.pInitMutex = 0;
-  }
-  sqlite3_mutex_leave(pMaster);
-
-  /* The following is just a sanity check to make sure SQLite has
-  ** been compiled correctly.  It is important to run this code, but
-  ** we don't want to run it too often and soak up CPU cycles for no
-  ** reason.  So we run it once during initialization.
-  */
-#ifndef NDEBUG
-#ifndef SQLITE_OMIT_FLOATING_POINT
-  /* This section of code's only "output" is via assert() statements. */
-  if ( rc==SQLITE_OK ){
-    u64 x = (((u64)1)<<63)-1;
-    double y;
-    assert(sizeof(x)==8);
-    assert(sizeof(x)==sizeof(y));
-    memcpy(&y, &x, 8);
-    assert( sqlite3IsNaN(y) );
-  }
-#endif
-#endif
-
-  return rc;
-}
-
-/*
-** Undo the effects of sqlite3_initialize().  Must not be called while
-** there are outstanding database connections or memory allocations or
-** while any part of SQLite is otherwise in use in any thread.  This
-** routine is not threadsafe.  But it is safe to invoke this routine
-** on when SQLite is already shut down.  If SQLite is already shut down
-** when this routine is invoked, then this routine is a harmless no-op.
-*/
-int sqlite3_shutdown(void){
-  if( sqlite3GlobalConfig.isInit ){
-    sqlite3_os_end();
-    sqlite3_reset_auto_extension();
-    sqlite3GlobalConfig.isInit = 0;
-  }
-  if( sqlite3GlobalConfig.isPCacheInit ){
-    sqlite3PcacheShutdown();
-    sqlite3GlobalConfig.isPCacheInit = 0;
-  }
-  if( sqlite3GlobalConfig.isMallocInit ){
-    sqlite3MallocEnd();
-    sqlite3GlobalConfig.isMallocInit = 0;
-  }
-  if( sqlite3GlobalConfig.isMutexInit ){
-    sqlite3MutexEnd();
-    sqlite3GlobalConfig.isMutexInit = 0;
-  }
-
-  return SQLITE_OK;
-}
-
-/*
-** This API allows applications to modify the global configuration of
-** the SQLite library at run-time.
-**
-** This routine should only be called when there are no outstanding
-** database connections or memory allocations.  This routine is not
-** threadsafe.  Failure to heed these warnings can lead to unpredictable
-** behavior.
-*/
-int sqlite3_config(int op, ...){
-  va_list ap;
-  int rc = SQLITE_OK;
-
-  /* sqlite3_config() shall return SQLITE_MISUSE if it is invoked while
-  ** the SQLite library is in use. */
-  if( sqlite3GlobalConfig.isInit ) return SQLITE_MISUSE;
-
-  va_start(ap, op);
-  switch( op ){
-
-    /* Mutex configuration options are only available in a threadsafe
-    ** compile. 
-    */
-#if SQLITE_THREADSAFE
-    case SQLITE_CONFIG_SINGLETHREAD: {
-      /* Disable all mutexing */
-      sqlite3GlobalConfig.bCoreMutex = 0;
-      sqlite3GlobalConfig.bFullMutex = 0;
-      break;
-    }
-    case SQLITE_CONFIG_MULTITHREAD: {
-      /* Disable mutexing of database connections */
-      /* Enable mutexing of core data structures */
-      sqlite3GlobalConfig.bCoreMutex = 1;
-      sqlite3GlobalConfig.bFullMutex = 0;
-      break;
-    }
-    case SQLITE_CONFIG_SERIALIZED: {
-      /* Enable all mutexing */
-      sqlite3GlobalConfig.bCoreMutex = 1;
-      sqlite3GlobalConfig.bFullMutex = 1;
-      break;
-    }
-    case SQLITE_CONFIG_MUTEX: {
-      /* Specify an alternative mutex implementation */
-      sqlite3GlobalConfig.mutex = *va_arg(ap, sqlite3_mutex_methods*);
-      break;
-    }
-    case SQLITE_CONFIG_GETMUTEX: {
-      /* Retrieve the current mutex implementation */
-      *va_arg(ap, sqlite3_mutex_methods*) = sqlite3GlobalConfig.mutex;
-      break;
-    }
-#endif
-
-
-    case SQLITE_CONFIG_MALLOC: {
-      /* Specify an alternative malloc implementation */
-      sqlite3GlobalConfig.m = *va_arg(ap, sqlite3_mem_methods*);
-      break;
-    }
-    case SQLITE_CONFIG_GETMALLOC: {
-      /* Retrieve the current malloc() implementation */
-      if( sqlite3GlobalConfig.m.xMalloc==0 ) sqlite3MemSetDefault();
-      *va_arg(ap, sqlite3_mem_methods*) = sqlite3GlobalConfig.m;
-      break;
-    }
-    case SQLITE_CONFIG_MEMSTATUS: {
-      /* Enable or disable the malloc status collection */
-      sqlite3GlobalConfig.bMemstat = va_arg(ap, int);
-      break;
-    }
-    case SQLITE_CONFIG_SCRATCH: {
-      /* Designate a buffer for scratch memory space */
-      sqlite3GlobalConfig.pScratch = va_arg(ap, void*);
-      sqlite3GlobalConfig.szScratch = va_arg(ap, int);
-      sqlite3GlobalConfig.nScratch = va_arg(ap, int);
-      break;
-    }
-    case SQLITE_CONFIG_PAGECACHE: {
-      /* Designate a buffer for page cache memory space */
-      sqlite3GlobalConfig.pPage = va_arg(ap, void*);
-      sqlite3GlobalConfig.szPage = va_arg(ap, int);
-      sqlite3GlobalConfig.nPage = va_arg(ap, int);
-      break;
-    }
-
-    case SQLITE_CONFIG_PCACHE: {
-      /* Specify an alternative page cache implementation */
-      sqlite3GlobalConfig.pcache = *va_arg(ap, sqlite3_pcache_methods*);
-      break;
-    }
-
-    case SQLITE_CONFIG_GETPCACHE: {
-      if( sqlite3GlobalConfig.pcache.xInit==0 ){
-        sqlite3PCacheSetDefault();
-      }
-      *va_arg(ap, sqlite3_pcache_methods*) = sqlite3GlobalConfig.pcache;
-      break;
-    }
-
-#if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5)
-    case SQLITE_CONFIG_HEAP: {
-      /* Designate a buffer for heap memory space */
-      sqlite3GlobalConfig.pHeap = va_arg(ap, void*);
-      sqlite3GlobalConfig.nHeap = va_arg(ap, int);
-      sqlite3GlobalConfig.mnReq = va_arg(ap, int);
-
-      if( sqlite3GlobalConfig.pHeap==0 ){
-        /* If the heap pointer is NULL, then restore the malloc implementation
-        ** back to NULL pointers too.  This will cause the malloc to go
-        ** back to its default implementation when sqlite3_initialize() is
-        ** run.
-        */
-        memset(&sqlite3GlobalConfig.m, 0, sizeof(sqlite3GlobalConfig.m));
-      }else{
-        /* The heap pointer is not NULL, then install one of the
-        ** mem5.c/mem3.c methods. If neither ENABLE_MEMSYS3 nor
-        ** ENABLE_MEMSYS5 is defined, return an error.
-        */
-#ifdef SQLITE_ENABLE_MEMSYS3
-        sqlite3GlobalConfig.m = *sqlite3MemGetMemsys3();
-#endif
-#ifdef SQLITE_ENABLE_MEMSYS5
-        sqlite3GlobalConfig.m = *sqlite3MemGetMemsys5();
-#endif
-      }
-      break;
-    }
-#endif
-
-    case SQLITE_CONFIG_LOOKASIDE: {
-      sqlite3GlobalConfig.szLookaside = va_arg(ap, int);
-      sqlite3GlobalConfig.nLookaside = va_arg(ap, int);
-      break;
-    }
-
-    default: {
-      rc = SQLITE_ERROR;
-      break;
-    }
-  }
-  va_end(ap);
-  return rc;
-}
-
-/*
-** Set up the lookaside buffers for a database connection.
-** Return SQLITE_OK on success.  
-** If lookaside is already active, return SQLITE_BUSY.
-**
-** The sz parameter is the number of bytes in each lookaside slot.
-** The cnt parameter is the number of slots.  If pStart is NULL the
-** space for the lookaside memory is obtained from sqlite3_malloc().
-** If pStart is not NULL then it is sz*cnt bytes of memory to use for
-** the lookaside memory.
-*/
-static int setupLookaside(sqlite3 *db, void *pBuf, int sz, int cnt){
-  void *pStart;
-  if( db->lookaside.nOut ){
-    return SQLITE_BUSY;
-  }
-  /* Free any existing lookaside buffer for this handle before
-  ** allocating a new one so we don't have to have space for 
-  ** both at the same time.
-  */
-  if( db->lookaside.bMalloced ){
-    sqlite3_free(db->lookaside.pStart);
-  }
-  /* The size of a lookaside slot needs to be larger than a pointer
-  ** to be useful.
-  */
-  if( sz<=(int)sizeof(LookasideSlot*) ) sz = 0;
-  if( cnt<0 ) cnt = 0;
-  if( sz==0 || cnt==0 ){
-    sz = 0;
-    pStart = 0;
-  }else if( pBuf==0 ){
-    sz = ROUND8(sz);
-    sqlite3BeginBenignMalloc();
-    pStart = sqlite3Malloc( sz*cnt );
-    sqlite3EndBenignMalloc();
-  }else{
-    sz = ROUNDDOWN8(sz);
-    pStart = pBuf;
-  }
-  db->lookaside.pStart = pStart;
-  db->lookaside.pFree = 0;
-  db->lookaside.sz = (u16)sz;
-  if( pStart ){
-    int i;
-    LookasideSlot *p;
-    assert( sz > (int)sizeof(LookasideSlot*) );
-    p = (LookasideSlot*)pStart;
-    for(i=cnt-1; i>=0; i--){
-      p->pNext = db->lookaside.pFree;
-      db->lookaside.pFree = p;
-      p = (LookasideSlot*)&((u8*)p)[sz];
-    }
-    db->lookaside.pEnd = p;
-    db->lookaside.bEnabled = 1;
-    db->lookaside.bMalloced = pBuf==0 ?1:0;
-  }else{
-    db->lookaside.pEnd = 0;
-    db->lookaside.bEnabled = 0;
-    db->lookaside.bMalloced = 0;
-  }
-  return SQLITE_OK;
-}
-
-/*
-** Return the mutex associated with a database connection.
-*/
-sqlite3_mutex *sqlite3_db_mutex(sqlite3 *db){
-  return db->mutex;
-}
-
-/*
-** Configuration settings for an individual database connection
-*/
-int sqlite3_db_config(sqlite3 *db, int op, ...){
-  va_list ap;
-  int rc;
-  va_start(ap, op);
-  switch( op ){
-    case SQLITE_DBCONFIG_LOOKASIDE: {
-      void *pBuf = va_arg(ap, void*);
-      int sz = va_arg(ap, int);
-      int cnt = va_arg(ap, int);
-      rc = setupLookaside(db, pBuf, sz, cnt);
-      break;
-    }
-    default: {
-      rc = SQLITE_ERROR;
-      break;
-    }
-  }
-  va_end(ap);
-  return rc;
-}
-
-
-/*
-** Return true if the buffer z[0..n-1] contains all spaces.
-*/
-static int allSpaces(const char *z, int n){
-  while( n>0 && z[n-1]==' ' ){ n--; }
-  return n==0;
-}
-
-/*
-** This is the default collating function named "BINARY" which is always
-** available.
-**
-** If the padFlag argument is not NULL then space padding at the end
-** of strings is ignored.  This implements the RTRIM collation.
-*/
-static int binCollFunc(
-  void *padFlag,
-  int nKey1, const void *pKey1,
-  int nKey2, const void *pKey2
-){
-  int rc, n;
-  n = nKey1<nKey2 ? nKey1 : nKey2;
-  rc = memcmp(pKey1, pKey2, n);
-  if( rc==0 ){
-    if( padFlag
-     && allSpaces(((char*)pKey1)+n, nKey1-n)
-     && allSpaces(((char*)pKey2)+n, nKey2-n)
-    ){
-      /* Leave rc unchanged at 0 */
-    }else{
-      rc = nKey1 - nKey2;
-    }
-  }
-  return rc;
-}
-
-/*
-** Another built-in collating sequence: NOCASE. 
-**
-** This collating sequence is intended to be used for "case independant
-** comparison". SQLite's knowledge of upper and lower case equivalents
-** extends only to the 26 characters used in the English language.
-**
-** At the moment there is only a UTF-8 implementation.
-*/
-static int nocaseCollatingFunc(
-  void *NotUsed,
-  int nKey1, const void *pKey1,
-  int nKey2, const void *pKey2
-){
-  int r = sqlite3StrNICmp(
-      (const char *)pKey1, (const char *)pKey2, (nKey1<nKey2)?nKey1:nKey2);
-  UNUSED_PARAMETER(NotUsed);
-  if( 0==r ){
-    r = nKey1-nKey2;
-  }
-  return r;
-}
-
-/*
-** Return the ROWID of the most recent insert
-*/
-sqlite_int64 sqlite3_last_insert_rowid(sqlite3 *db){
-  return db->lastRowid;
-}
-
-/*
-** Return the number of changes in the most recent call to sqlite3_exec().
-*/
-int sqlite3_changes(sqlite3 *db){
-  return db->nChange;
-}
-
-/*
-** Return the number of changes since the database handle was opened.
-*/
-int sqlite3_total_changes(sqlite3 *db){
-  return db->nTotalChange;
-}
-
-/*
-** Close all open savepoints. This function only manipulates fields of the
-** database handle object, it does not close any savepoints that may be open
-** at the b-tree/pager level.
-*/
-void sqlite3CloseSavepoints(sqlite3 *db){
-  while( db->pSavepoint ){
-    Savepoint *pTmp = db->pSavepoint;
-    db->pSavepoint = pTmp->pNext;
-    sqlite3DbFree(db, pTmp);
-  }
-  db->nSavepoint = 0;
-  db->nStatement = 0;
-  db->isTransactionSavepoint = 0;
-}
-
-/*
-** Close an existing SQLite database
-*/
-int sqlite3_close(sqlite3 *db){
-  HashElem *i;
-  int j;
-
-  if( !db ){
-    return SQLITE_OK;
-  }
-  if( !sqlite3SafetyCheckSickOrOk(db) ){
-    return SQLITE_MISUSE;
-  }
-  sqlite3_mutex_enter(db->mutex);
-
-  sqlite3ResetInternalSchema(db, 0);
-
-  /* If a transaction is open, the ResetInternalSchema() call above
-  ** will not have called the xDisconnect() method on any virtual
-  ** tables in the db->aVTrans[] array. The following sqlite3VtabRollback()
-  ** call will do so. We need to do this before the check for active
-  ** SQL statements below, as the v-table implementation may be storing
-  ** some prepared statements internally.
-  */
-  sqlite3VtabRollback(db);
-
-  /* If there are any outstanding VMs, return SQLITE_BUSY. */
-  if( db->pVdbe ){
-    sqlite3Error(db, SQLITE_BUSY, 
-        "unable to close due to unfinalised statements");
-    sqlite3_mutex_leave(db->mutex);
-    return SQLITE_BUSY;
-  }
-  assert( sqlite3SafetyCheckSickOrOk(db) );
-
-  for(j=0; j<db->nDb; j++){
-    Btree *pBt = db->aDb[j].pBt;
-    if( pBt && sqlite3BtreeIsInBackup(pBt) ){
-      sqlite3Error(db, SQLITE_BUSY, 
-          "unable to close due to unfinished backup operation");
-      sqlite3_mutex_leave(db->mutex);
-      return SQLITE_BUSY;
-    }
-  }
-
-  /* Free any outstanding Savepoint structures. */
-  sqlite3CloseSavepoints(db);
-
-  for(j=0; j<db->nDb; j++){
-    struct Db *pDb = &db->aDb[j];
-    if( pDb->pBt ){
-      sqlite3BtreeClose(pDb->pBt);
-      pDb->pBt = 0;
-      if( j!=1 ){
-        pDb->pSchema = 0;
-      }
-    }
-  }
-  sqlite3ResetInternalSchema(db, 0);
-
-  /* Tell the code in notify.c that the connection no longer holds any
-  ** locks and does not require any further unlock-notify callbacks.
-  */
-  sqlite3ConnectionClosed(db);
-
-  assert( db->nDb<=2 );
-  assert( db->aDb==db->aDbStatic );
-  for(j=0; j<ArraySize(db->aFunc.a); j++){
-    FuncDef *pNext, *pHash, *p;
-    for(p=db->aFunc.a[j]; p; p=pHash){
-      pHash = p->pHash;
-      while( p ){
-        pNext = p->pNext;
-        sqlite3DbFree(db, p);
-        p = pNext;
-      }
-    }
-  }
-  for(i=sqliteHashFirst(&db->aCollSeq); i; i=sqliteHashNext(i)){
-    CollSeq *pColl = (CollSeq *)sqliteHashData(i);
-    /* Invoke any destructors registered for collation sequence user data. */
-    for(j=0; j<3; j++){
-      if( pColl[j].xDel ){
-        pColl[j].xDel(pColl[j].pUser);
-      }
-    }
-    sqlite3DbFree(db, pColl);
-  }
-  sqlite3HashClear(&db->aCollSeq);
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  for(i=sqliteHashFirst(&db->aModule); i; i=sqliteHashNext(i)){
-    Module *pMod = (Module *)sqliteHashData(i);
-    if( pMod->xDestroy ){
-      pMod->xDestroy(pMod->pAux);
-    }
-    sqlite3DbFree(db, pMod);
-  }
-  sqlite3HashClear(&db->aModule);
-#endif
-
-  sqlite3Error(db, SQLITE_OK, 0); /* Deallocates any cached error strings. */
-  if( db->pErr ){
-    sqlite3ValueFree(db->pErr);
-  }
-  sqlite3CloseExtensions(db);
-
-  db->magic = SQLITE_MAGIC_ERROR;
-
-  /* The temp-database schema is allocated differently from the other schema
-  ** objects (using sqliteMalloc() directly, instead of sqlite3BtreeSchema()).
-  ** So it needs to be freed here. Todo: Why not roll the temp schema into
-  ** the same sqliteMalloc() as the one that allocates the database 
-  ** structure?
-  */
-  sqlite3DbFree(db, db->aDb[1].pSchema);
-  sqlite3_mutex_leave(db->mutex);
-  db->magic = SQLITE_MAGIC_CLOSED;
-  sqlite3_mutex_free(db->mutex);
-  assert( db->lookaside.nOut==0 );  /* Fails on a lookaside memory leak */
-  if( db->lookaside.bMalloced ){
-    sqlite3_free(db->lookaside.pStart);
-  }
-  sqlite3_free(db);
-  return SQLITE_OK;
-}
-
-/*
-** Rollback all database files.
-*/
-void sqlite3RollbackAll(sqlite3 *db){
-  int i;
-  int inTrans = 0;
-  assert( sqlite3_mutex_held(db->mutex) );
-  sqlite3BeginBenignMalloc();
-  for(i=0; i<db->nDb; i++){
-    if( db->aDb[i].pBt ){
-      if( sqlite3BtreeIsInTrans(db->aDb[i].pBt) ){
-        inTrans = 1;
-      }
-      sqlite3BtreeRollback(db->aDb[i].pBt);
-      db->aDb[i].inTrans = 0;
-    }
-  }
-  sqlite3VtabRollback(db);
-  sqlite3EndBenignMalloc();
-
-  if( db->flags&SQLITE_InternChanges ){
-    sqlite3ExpirePreparedStatements(db);
-    sqlite3ResetInternalSchema(db, 0);
-  }
-
-  /* If one has been configured, invoke the rollback-hook callback */
-  if( db->xRollbackCallback && (inTrans || !db->autoCommit) ){
-    db->xRollbackCallback(db->pRollbackArg);
-  }
-}
-
-/*
-** Return a static string that describes the kind of error specified in the
-** argument.
-*/
-const char *sqlite3ErrStr(int rc){
-  static const char* const aMsg[] = {
-    /* SQLITE_OK          */ "not an error",
-    /* SQLITE_ERROR       */ "SQL logic error or missing database",
-    /* SQLITE_INTERNAL    */ 0,
-    /* SQLITE_PERM        */ "access permission denied",
-    /* SQLITE_ABORT       */ "callback requested query abort",
-    /* SQLITE_BUSY        */ "database is locked",
-    /* SQLITE_LOCKED      */ "database table is locked",
-    /* SQLITE_NOMEM       */ "out of memory",
-    /* SQLITE_READONLY    */ "attempt to write a readonly database",
-    /* SQLITE_INTERRUPT   */ "interrupted",
-    /* SQLITE_IOERR       */ "disk I/O error",
-    /* SQLITE_CORRUPT     */ "database disk image is malformed",
-    /* SQLITE_NOTFOUND    */ 0,
-    /* SQLITE_FULL        */ "database or disk is full",
-    /* SQLITE_CANTOPEN    */ "unable to open database file",
-    /* SQLITE_PROTOCOL    */ 0,
-    /* SQLITE_EMPTY       */ "table contains no data",
-    /* SQLITE_SCHEMA      */ "database schema has changed",
-    /* SQLITE_TOOBIG      */ "string or blob too big",
-    /* SQLITE_CONSTRAINT  */ "constraint failed",
-    /* SQLITE_MISMATCH    */ "datatype mismatch",
-    /* SQLITE_MISUSE      */ "library routine called out of sequence",
-    /* SQLITE_NOLFS       */ "large file support is disabled",
-    /* SQLITE_AUTH        */ "authorization denied",
-    /* SQLITE_FORMAT      */ "auxiliary database format error",
-    /* SQLITE_RANGE       */ "bind or column index out of range",
-    /* SQLITE_NOTADB      */ "file is encrypted or is not a database",
-  };
-  rc &= 0xff;
-  if( ALWAYS(rc>=0) && rc<(int)(sizeof(aMsg)/sizeof(aMsg[0])) && aMsg[rc]!=0 ){
-    return aMsg[rc];
-  }else{
-    return "unknown error";
-  }
-}
-
-/*
-** This routine implements a busy callback that sleeps and tries
-** again until a timeout value is reached.  The timeout value is
-** an integer number of milliseconds passed in as the first
-** argument.
-*/
-static int sqliteDefaultBusyCallback(
- void *ptr,               /* Database connection */
- int count                /* Number of times table has been busy */
-){
-#if SQLITE_OS_WIN || (defined(HAVE_USLEEP) && HAVE_USLEEP)
-  static const u8 delays[] =
-     { 1, 2, 5, 10, 15, 20, 25, 25,  25,  50,  50, 100 };
-  static const u8 totals[] =
-     { 0, 1, 3,  8, 18, 33, 53, 78, 103, 128, 178, 228 };
-# define NDELAY (sizeof(delays)/sizeof(delays[0]))
-  sqlite3 *db = (sqlite3 *)ptr;
-  int timeout = db->busyTimeout;
-  int delay, prior;
-
-  assert( count>=0 );
-  if( count < NDELAY ){
-    delay = delays[count];
-    prior = totals[count];
-  }else{
-    delay = delays[NDELAY-1];
-    prior = totals[NDELAY-1] + delay*(count-(NDELAY-1));
-  }
-  if( prior + delay > timeout ){
-    delay = timeout - prior;
-    if( delay<=0 ) return 0;
-  }
-  sqlite3OsSleep(db->pVfs, delay*1000);
-  return 1;
-#else
-  sqlite3 *db = (sqlite3 *)ptr;
-  int timeout = ((sqlite3 *)ptr)->busyTimeout;
-  if( (count+1)*1000 > timeout ){
-    return 0;
-  }
-  sqlite3OsSleep(db->pVfs, 1000000);
-  return 1;
-#endif
-}
-
-/*
-** Invoke the given busy handler.
-**
-** This routine is called when an operation failed with a lock.
-** If this routine returns non-zero, the lock is retried.  If it
-** returns 0, the operation aborts with an SQLITE_BUSY error.
-*/
-int sqlite3InvokeBusyHandler(BusyHandler *p){
-  int rc;
-  if( NEVER(p==0) || p->xFunc==0 || p->nBusy<0 ) return 0;
-  rc = p->xFunc(p->pArg, p->nBusy);
-  if( rc==0 ){
-    p->nBusy = -1;
-  }else{
-    p->nBusy++;
-  }
-  return rc; 
-}
-
-/*
-** This routine sets the busy callback for an Sqlite database to the
-** given callback function with the given argument.
-*/
-int sqlite3_busy_handler(
-  sqlite3 *db,
-  int (*xBusy)(void*,int),
-  void *pArg
-){
-  sqlite3_mutex_enter(db->mutex);
-  db->busyHandler.xFunc = xBusy;
-  db->busyHandler.pArg = pArg;
-  db->busyHandler.nBusy = 0;
-  sqlite3_mutex_leave(db->mutex);
-  return SQLITE_OK;
-}
-
-#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
-/*
-** This routine sets the progress callback for an Sqlite database to the
-** given callback function with the given argument. The progress callback will
-** be invoked every nOps opcodes.
-*/
-void sqlite3_progress_handler(
-  sqlite3 *db, 
-  int nOps,
-  int (*xProgress)(void*), 
-  void *pArg
-){
-  sqlite3_mutex_enter(db->mutex);
-  if( nOps>0 ){
-    db->xProgress = xProgress;
-    db->nProgressOps = nOps;
-    db->pProgressArg = pArg;
-  }else{
-    db->xProgress = 0;
-    db->nProgressOps = 0;
-    db->pProgressArg = 0;
-  }
-  sqlite3_mutex_leave(db->mutex);
-}
-#endif
-
-
-/*
-** This routine installs a default busy handler that waits for the
-** specified number of milliseconds before returning 0.
-*/
-int sqlite3_busy_timeout(sqlite3 *db, int ms){
-  if( ms>0 ){
-    db->busyTimeout = ms;
-    sqlite3_busy_handler(db, sqliteDefaultBusyCallback, (void*)db);
-  }else{
-    sqlite3_busy_handler(db, 0, 0);
-  }
-  return SQLITE_OK;
-}
-
-/*
-** Cause any pending operation to stop at its earliest opportunity.
-*/
-void sqlite3_interrupt(sqlite3 *db){
-  db->u1.isInterrupted = 1;
-}
-
-
-/*
-** This function is exactly the same as sqlite3_create_function(), except
-** that it is designed to be called by internal code. The difference is
-** that if a malloc() fails in sqlite3_create_function(), an error code
-** is returned and the mallocFailed flag cleared. 
-*/
-int sqlite3CreateFunc(
-  sqlite3 *db,
-  const char *zFunctionName,
-  int nArg,
-  int enc,
-  void *pUserData,
-  void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
-  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
-  void (*xFinal)(sqlite3_context*)
-){
-  FuncDef *p;
-  int nName;
-
-  assert( sqlite3_mutex_held(db->mutex) );
-  if( zFunctionName==0 ||
-      (xFunc && (xFinal || xStep)) || 
-      (!xFunc && (xFinal && !xStep)) ||
-      (!xFunc && (!xFinal && xStep)) ||
-      (nArg<-1 || nArg>SQLITE_MAX_FUNCTION_ARG) ||
-      (255<(nName = sqlite3Strlen30( zFunctionName))) ){
-    return SQLITE_MISUSE;
-  }
-  
-#ifndef SQLITE_OMIT_UTF16
-  /* If SQLITE_UTF16 is specified as the encoding type, transform this
-  ** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the
-  ** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally.
-  **
-  ** If SQLITE_ANY is specified, add three versions of the function
-  ** to the hash table.
-  */
-  if( enc==SQLITE_UTF16 ){
-    enc = SQLITE_UTF16NATIVE;
-  }else if( enc==SQLITE_ANY ){
-    int rc;
-    rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF8,
-         pUserData, xFunc, xStep, xFinal);
-    if( rc==SQLITE_OK ){
-      rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF16LE,
-          pUserData, xFunc, xStep, xFinal);
-    }
-    if( rc!=SQLITE_OK ){
-      return rc;
-    }
-    enc = SQLITE_UTF16BE;
-  }
-#else
-  enc = SQLITE_UTF8;
-#endif
-  
-  /* Check if an existing function is being overridden or deleted. If so,
-  ** and there are active VMs, then return SQLITE_BUSY. If a function
-  ** is being overridden/deleted but there are no active VMs, allow the
-  ** operation to continue but invalidate all precompiled statements.
-  */
-  p = sqlite3FindFunction(db, zFunctionName, nName, nArg, (u8)enc, 0);
-  if( p && p->iPrefEnc==enc && p->nArg==nArg ){
-    if( db->activeVdbeCnt ){
-      sqlite3Error(db, SQLITE_BUSY, 
-        "unable to delete/modify user-function due to active statements");
-      assert( !db->mallocFailed );
-      return SQLITE_BUSY;
-    }else{
-      sqlite3ExpirePreparedStatements(db);
-    }
-  }
-
-  p = sqlite3FindFunction(db, zFunctionName, nName, nArg, (u8)enc, 1);
-  assert(p || db->mallocFailed);
-  if( !p ){
-    return SQLITE_NOMEM;
-  }
-  p->flags = 0;
-  p->xFunc = xFunc;
-  p->xStep = xStep;
-  p->xFinalize = xFinal;
-  p->pUserData = pUserData;
-  p->nArg = (u16)nArg;
-  return SQLITE_OK;
-}
-
-/*
-** Create new user functions.
-*/
-int sqlite3_create_function(
-  sqlite3 *db,
-  const char *zFunctionName,
-  int nArg,
-  int enc,
-  void *p,
-  void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
-  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
-  void (*xFinal)(sqlite3_context*)
-){
-  int rc;
-  sqlite3_mutex_enter(db->mutex);
-  rc = sqlite3CreateFunc(db, zFunctionName, nArg, enc, p, xFunc, xStep, xFinal);
-  rc = sqlite3ApiExit(db, rc);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-}
-
-#ifndef SQLITE_OMIT_UTF16
-int sqlite3_create_function16(
-  sqlite3 *db,
-  const void *zFunctionName,
-  int nArg,
-  int eTextRep,
-  void *p,
-  void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
-  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
-  void (*xFinal)(sqlite3_context*)
-){
-  int rc;
-  char *zFunc8;
-  sqlite3_mutex_enter(db->mutex);
-  assert( !db->mallocFailed );
-  zFunc8 = sqlite3Utf16to8(db, zFunctionName, -1);
-  rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xFunc, xStep, xFinal);
-  sqlite3DbFree(db, zFunc8);
-  rc = sqlite3ApiExit(db, rc);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-}
-#endif
-
-
-/*
-** Declare that a function has been overloaded by a virtual table.
-**
-** If the function already exists as a regular global function, then
-** this routine is a no-op.  If the function does not exist, then create
-** a new one that always throws a run-time error.  
-**
-** When virtual tables intend to provide an overloaded function, they
-** should call this routine to make sure the global function exists.
-** A global function must exist in order for name resolution to work
-** properly.
-*/
-int sqlite3_overload_function(
-  sqlite3 *db,
-  const char *zName,
-  int nArg
-){
-  int nName = sqlite3Strlen30(zName);
-  int rc;
-  sqlite3_mutex_enter(db->mutex);
-  if( sqlite3FindFunction(db, zName, nName, nArg, SQLITE_UTF8, 0)==0 ){
-    sqlite3CreateFunc(db, zName, nArg, SQLITE_UTF8,
-                      0, sqlite3InvalidFunction, 0, 0);
-  }
-  rc = sqlite3ApiExit(db, SQLITE_OK);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-}
-
-#ifndef SQLITE_OMIT_TRACE
-/*
-** Register a trace function.  The pArg from the previously registered trace
-** is returned.  
-**
-** A NULL trace function means that no tracing is executes.  A non-NULL
-** trace is a pointer to a function that is invoked at the start of each
-** SQL statement.
-*/
-void *sqlite3_trace(sqlite3 *db, void (*xTrace)(void*,const char*), void *pArg){
-  void *pOld;
-  sqlite3_mutex_enter(db->mutex);
-  pOld = db->pTraceArg;
-  db->xTrace = xTrace;
-  db->pTraceArg = pArg;
-  sqlite3_mutex_leave(db->mutex);
-  return pOld;
-}
-/*
-** Register a profile function.  The pArg from the previously registered 
-** profile function is returned.  
-**
-** A NULL profile function means that no profiling is executes.  A non-NULL
-** profile is a pointer to a function that is invoked at the conclusion of
-** each SQL statement that is run.
-*/
-void *sqlite3_profile(
-  sqlite3 *db,
-  void (*xProfile)(void*,const char*,sqlite_uint64),
-  void *pArg
-){
-  void *pOld;
-  sqlite3_mutex_enter(db->mutex);
-  pOld = db->pProfileArg;
-  db->xProfile = xProfile;
-  db->pProfileArg = pArg;
-  sqlite3_mutex_leave(db->mutex);
-  return pOld;
-}
-#endif /* SQLITE_OMIT_TRACE */
-
-/*** EXPERIMENTAL ***
-**
-** Register a function to be invoked when a transaction comments.
-** If the invoked function returns non-zero, then the commit becomes a
-** rollback.
-*/
-void *sqlite3_commit_hook(
-  sqlite3 *db,              /* Attach the hook to this database */
-  int (*xCallback)(void*),  /* Function to invoke on each commit */
-  void *pArg                /* Argument to the function */
-){
-  void *pOld;
-  sqlite3_mutex_enter(db->mutex);
-  pOld = db->pCommitArg;
-  db->xCommitCallback = xCallback;
-  db->pCommitArg = pArg;
-  sqlite3_mutex_leave(db->mutex);
-  return pOld;
-}
-
-/*
-** Register a callback to be invoked each time a row is updated,
-** inserted or deleted using this database connection.
-*/
-void *sqlite3_update_hook(
-  sqlite3 *db,              /* Attach the hook to this database */
-  void (*xCallback)(void*,int,char const *,char const *,sqlite_int64),
-  void *pArg                /* Argument to the function */
-){
-  void *pRet;
-  sqlite3_mutex_enter(db->mutex);
-  pRet = db->pUpdateArg;
-  db->xUpdateCallback = xCallback;
-  db->pUpdateArg = pArg;
-  sqlite3_mutex_leave(db->mutex);
-  return pRet;
-}
-
-/*
-** Register a callback to be invoked each time a transaction is rolled
-** back by this database connection.
-*/
-void *sqlite3_rollback_hook(
-  sqlite3 *db,              /* Attach the hook to this database */
-  void (*xCallback)(void*), /* Callback function */
-  void *pArg                /* Argument to the function */
-){
-  void *pRet;
-  sqlite3_mutex_enter(db->mutex);
-  pRet = db->pRollbackArg;
-  db->xRollbackCallback = xCallback;
-  db->pRollbackArg = pArg;
-  sqlite3_mutex_leave(db->mutex);
-  return pRet;
-}
-
-/*
-** This function returns true if main-memory should be used instead of
-** a temporary file for transient pager files and statement journals.
-** The value returned depends on the value of db->temp_store (runtime
-** parameter) and the compile time value of SQLITE_TEMP_STORE. The
-** following table describes the relationship between these two values
-** and this functions return value.
-**
-**   SQLITE_TEMP_STORE     db->temp_store     Location of temporary database
-**   -----------------     --------------     ------------------------------
-**   0                     any                file      (return 0)
-**   1                     1                  file      (return 0)
-**   1                     2                  memory    (return 1)
-**   1                     0                  file      (return 0)
-**   2                     1                  file      (return 0)
-**   2                     2                  memory    (return 1)
-**   2                     0                  memory    (return 1)
-**   3                     any                memory    (return 1)
-*/
-int sqlite3TempInMemory(const sqlite3 *db){
-#if SQLITE_TEMP_STORE==1
-  return ( db->temp_store==2 );
-#endif
-#if SQLITE_TEMP_STORE==2
-  return ( db->temp_store!=1 );
-#endif
-#if SQLITE_TEMP_STORE==3
-  return 1;
-#endif
-#if SQLITE_TEMP_STORE<1 || SQLITE_TEMP_STORE>3
-  return 0;
-#endif
-}
-
-/*
-** This routine is called to create a connection to a database BTree
-** driver.  If zFilename is the name of a file, then that file is
-** opened and used.  If zFilename is the magic name ":memory:" then
-** the database is stored in memory (and is thus forgotten as soon as
-** the connection is closed.)  If zFilename is NULL then the database
-** is a "virtual" database for transient use only and is deleted as
-** soon as the connection is closed.
-**
-** A virtual database can be either a disk file (that is automatically
-** deleted when the file is closed) or it an be held entirely in memory.
-** The sqlite3TempInMemory() function is used to determine which.
-*/
-int sqlite3BtreeFactory(
-  const sqlite3 *db,        /* Main database when opening aux otherwise 0 */
-  const char *zFilename,    /* Name of the file containing the BTree database */
-  int omitJournal,          /* if TRUE then do not journal this file */
-  int nCache,               /* How many pages in the page cache */
-  int vfsFlags,             /* Flags passed through to vfsOpen */
-  Btree **ppBtree           /* Pointer to new Btree object written here */
-){
-  int btFlags = 0;
-  int rc;
-  
-  assert( sqlite3_mutex_held(db->mutex) );
-  assert( ppBtree != 0);
-  if( omitJournal ){
-    btFlags |= BTREE_OMIT_JOURNAL;
-  }
-  if( db->flags & SQLITE_NoReadlock ){
-    btFlags |= BTREE_NO_READLOCK;
-  }
-#ifndef SQLITE_OMIT_MEMORYDB
-  if( zFilename==0 && sqlite3TempInMemory(db) ){
-    zFilename = ":memory:";
-  }
-#endif
-
-  if( (vfsFlags & SQLITE_OPEN_MAIN_DB)!=0 && (zFilename==0 || *zFilename==0) ){
-    vfsFlags = (vfsFlags & ~SQLITE_OPEN_MAIN_DB) | SQLITE_OPEN_TEMP_DB;
-  }
-  rc = sqlite3BtreeOpen(zFilename, (sqlite3 *)db, ppBtree, btFlags, vfsFlags);
-
-  /* If the B-Tree was successfully opened, set the pager-cache size to the
-  ** default value. Except, if the call to BtreeOpen() returned a handle
-  ** open on an existing shared pager-cache, do not change the pager-cache 
-  ** size.
-  */
-  if( rc==SQLITE_OK && 0==sqlite3BtreeSchema(*ppBtree, 0, 0) ){
-    sqlite3BtreeSetCacheSize(*ppBtree, nCache);
-  }
-  return rc;
-}
-
-/*
-** Return UTF-8 encoded English language explanation of the most recent
-** error.
-*/
-const char *sqlite3_errmsg(sqlite3 *db){
-  const char *z;
-  if( !db ){
-    return sqlite3ErrStr(SQLITE_NOMEM);
-  }
-  if( !sqlite3SafetyCheckSickOrOk(db) ){
-    return sqlite3ErrStr(SQLITE_MISUSE);
-  }
-  sqlite3_mutex_enter(db->mutex);
-  if( db->mallocFailed ){
-    z = sqlite3ErrStr(SQLITE_NOMEM);
-  }else{
-    z = (char*)sqlite3_value_text(db->pErr);
-    assert( !db->mallocFailed );
-    if( z==0 ){
-      z = sqlite3ErrStr(db->errCode);
-    }
-  }
-  sqlite3_mutex_leave(db->mutex);
-  return z;
-}
-
-#ifndef SQLITE_OMIT_UTF16
-/*
-** Return UTF-16 encoded English language explanation of the most recent
-** error.
-*/
-const void *sqlite3_errmsg16(sqlite3 *db){
-  static const u16 outOfMem[] = {
-    'o', 'u', 't', ' ', 'o', 'f', ' ', 'm', 'e', 'm', 'o', 'r', 'y', 0
-  };
-  static const u16 misuse[] = {
-    'l', 'i', 'b', 'r', 'a', 'r', 'y', ' ', 
-    'r', 'o', 'u', 't', 'i', 'n', 'e', ' ', 
-    'c', 'a', 'l', 'l', 'e', 'd', ' ', 
-    'o', 'u', 't', ' ', 
-    'o', 'f', ' ', 
-    's', 'e', 'q', 'u', 'e', 'n', 'c', 'e', 0
-  };
-
-  const void *z;
-  if( !db ){
-    return (void *)outOfMem;
-  }
-  if( !sqlite3SafetyCheckSickOrOk(db) ){
-    return (void *)misuse;
-  }
-  sqlite3_mutex_enter(db->mutex);
-  if( db->mallocFailed ){
-    z = (void *)outOfMem;
-  }else{
-    z = sqlite3_value_text16(db->pErr);
-    if( z==0 ){
-      sqlite3ValueSetStr(db->pErr, -1, sqlite3ErrStr(db->errCode),
-           SQLITE_UTF8, SQLITE_STATIC);
-      z = sqlite3_value_text16(db->pErr);
-    }
-    /* A malloc() may have failed within the call to sqlite3_value_text16()
-    ** above. If this is the case, then the db->mallocFailed flag needs to
-    ** be cleared before returning. Do this directly, instead of via
-    ** sqlite3ApiExit(), to avoid setting the database handle error message.
-    */
-    db->mallocFailed = 0;
-  }
-  sqlite3_mutex_leave(db->mutex);
-  return z;
-}
-#endif /* SQLITE_OMIT_UTF16 */
-
-/*
-** Return the most recent error code generated by an SQLite routine. If NULL is
-** passed to this function, we assume a malloc() failed during sqlite3_open().
-*/
-int sqlite3_errcode(sqlite3 *db){
-  if( db && !sqlite3SafetyCheckSickOrOk(db) ){
-    return SQLITE_MISUSE;
-  }
-  if( !db || db->mallocFailed ){
-    return SQLITE_NOMEM;
-  }
-  return db->errCode & db->errMask;
-}
-int sqlite3_extended_errcode(sqlite3 *db){
-  if( db && !sqlite3SafetyCheckSickOrOk(db) ){
-    return SQLITE_MISUSE;
-  }
-  if( !db || db->mallocFailed ){
-    return SQLITE_NOMEM;
-  }
-  return db->errCode;
-}
-
-/*
-** Create a new collating function for database "db".  The name is zName
-** and the encoding is enc.
-*/
-static int createCollation(
-  sqlite3* db,
-  const char *zName, 
-  u8 enc,
-  u8 collType,
-  void* pCtx,
-  int(*xCompare)(void*,int,const void*,int,const void*),
-  void(*xDel)(void*)
-){
-  CollSeq *pColl;
-  int enc2;
-  int nName = sqlite3Strlen30(zName);
-  
-  assert( sqlite3_mutex_held(db->mutex) );
-
-  /* If SQLITE_UTF16 is specified as the encoding type, transform this
-  ** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the
-  ** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally.
-  */
-  enc2 = enc;
-  testcase( enc2==SQLITE_UTF16 );
-  testcase( enc2==SQLITE_UTF16_ALIGNED );
-  if( enc2==SQLITE_UTF16 || enc2==SQLITE_UTF16_ALIGNED ){
-    enc2 = SQLITE_UTF16NATIVE;
-  }
-  if( enc2<SQLITE_UTF8 || enc2>SQLITE_UTF16BE ){
-    return SQLITE_MISUSE;
-  }
-
-  /* Check if this call is removing or replacing an existing collation 
-  ** sequence. If so, and there are active VMs, return busy. If there
-  ** are no active VMs, invalidate any pre-compiled statements.
-  */
-  pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, 0);
-  if( pColl && pColl->xCmp ){
-    if( db->activeVdbeCnt ){
-      sqlite3Error(db, SQLITE_BUSY, 
-        "unable to delete/modify collation sequence due to active statements");
-      return SQLITE_BUSY;
-    }
-    sqlite3ExpirePreparedStatements(db);
-
-    /* If collation sequence pColl was created directly by a call to
-    ** sqlite3_create_collation, and not generated by synthCollSeq(),
-    ** then any copies made by synthCollSeq() need to be invalidated.
-    ** Also, collation destructor - CollSeq.xDel() - function may need
-    ** to be called.
-    */ 
-    if( (pColl->enc & ~SQLITE_UTF16_ALIGNED)==enc2 ){
-      CollSeq *aColl = sqlite3HashFind(&db->aCollSeq, zName, nName);
-      int j;
-      for(j=0; j<3; j++){
-        CollSeq *p = &aColl[j];
-        if( p->enc==pColl->enc ){
-          if( p->xDel ){
-            p->xDel(p->pUser);
-          }
-          p->xCmp = 0;
-        }
-      }
-    }
-  }
-
-  pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, 1);
-  if( pColl ){
-    pColl->xCmp = xCompare;
-    pColl->pUser = pCtx;
-    pColl->xDel = xDel;
-    pColl->enc = (u8)(enc2 | (enc & SQLITE_UTF16_ALIGNED));
-    pColl->type = collType;
-  }
-  sqlite3Error(db, SQLITE_OK, 0);
-  return SQLITE_OK;
-}
-
-
-/*
-** This array defines hard upper bounds on limit values.  The
-** initializer must be kept in sync with the SQLITE_LIMIT_*
-** #defines in sqlite3.h.
-*/
-static const int aHardLimit[] = {
-  SQLITE_MAX_LENGTH,
-  SQLITE_MAX_SQL_LENGTH,
-  SQLITE_MAX_COLUMN,
-  SQLITE_MAX_EXPR_DEPTH,
-  SQLITE_MAX_COMPOUND_SELECT,
-  SQLITE_MAX_VDBE_OP,
-  SQLITE_MAX_FUNCTION_ARG,
-  SQLITE_MAX_ATTACHED,
-  SQLITE_MAX_LIKE_PATTERN_LENGTH,
-  SQLITE_MAX_VARIABLE_NUMBER,
-  SQLITE_MAX_TRIGGER_DEPTH,
-};
-
-/*
-** Make sure the hard limits are set to reasonable values
-*/
-#if SQLITE_MAX_LENGTH<100
-# error SQLITE_MAX_LENGTH must be at least 100
-#endif
-#if SQLITE_MAX_SQL_LENGTH<100
-# error SQLITE_MAX_SQL_LENGTH must be at least 100
-#endif
-#if SQLITE_MAX_SQL_LENGTH>SQLITE_MAX_LENGTH
-# error SQLITE_MAX_SQL_LENGTH must not be greater than SQLITE_MAX_LENGTH
-#endif
-#if SQLITE_MAX_COMPOUND_SELECT<2
-# error SQLITE_MAX_COMPOUND_SELECT must be at least 2
-#endif
-#if SQLITE_MAX_VDBE_OP<40
-# error SQLITE_MAX_VDBE_OP must be at least 40
-#endif
-#if SQLITE_MAX_FUNCTION_ARG<0 || SQLITE_MAX_FUNCTION_ARG>1000
-# error SQLITE_MAX_FUNCTION_ARG must be between 0 and 1000
-#endif
-#if SQLITE_MAX_ATTACHED<0 || SQLITE_MAX_ATTACHED>30
-# error SQLITE_MAX_ATTACHED must be between 0 and 30
-#endif
-#if SQLITE_MAX_LIKE_PATTERN_LENGTH<1
-# error SQLITE_MAX_LIKE_PATTERN_LENGTH must be at least 1
-#endif
-#if SQLITE_MAX_VARIABLE_NUMBER<1
-# error SQLITE_MAX_VARIABLE_NUMBER must be at least 1
-#endif
-#if SQLITE_MAX_COLUMN>32767
-# error SQLITE_MAX_COLUMN must not exceed 32767
-#endif
-#if SQLITE_MAX_TRIGGER_DEPTH<1
-# error SQLITE_MAX_TRIGGER_DEPTH must be at least 1
-#endif
-
-
-/*
-** Change the value of a limit.  Report the old value.
-** If an invalid limit index is supplied, report -1.
-** Make no changes but still report the old value if the
-** new limit is negative.
-**
-** A new lower limit does not shrink existing constructs.
-** It merely prevents new constructs that exceed the limit
-** from forming.
-*/
-int sqlite3_limit(sqlite3 *db, int limitId, int newLimit){
-  int oldLimit;
-  if( limitId<0 || limitId>=SQLITE_N_LIMIT ){
-    return -1;
-  }
-  oldLimit = db->aLimit[limitId];
-  if( newLimit>=0 ){
-    if( newLimit>aHardLimit[limitId] ){
-      newLimit = aHardLimit[limitId];
-    }
-    db->aLimit[limitId] = newLimit;
-  }
-  return oldLimit;
-}
-
-/*
-** This routine does the work of opening a database on behalf of
-** sqlite3_open() and sqlite3_open16(). The database filename "zFilename"  
-** is UTF-8 encoded.
-*/
-static int openDatabase(
-  const char *zFilename, /* Database filename UTF-8 encoded */
-  sqlite3 **ppDb,        /* OUT: Returned database handle */
-  unsigned flags,        /* Operational flags */
-  const char *zVfs       /* Name of the VFS to use */
-){
-  sqlite3 *db;
-  int rc;
-  int isThreadsafe;
-
-  *ppDb = 0;
-#ifndef SQLITE_OMIT_AUTOINIT
-  rc = sqlite3_initialize();
-  if( rc ) return rc;
-#endif
-
-  if( sqlite3GlobalConfig.bCoreMutex==0 ){
-    isThreadsafe = 0;
-  }else if( flags & SQLITE_OPEN_NOMUTEX ){
-    isThreadsafe = 0;
-  }else if( flags & SQLITE_OPEN_FULLMUTEX ){
-    isThreadsafe = 1;
-  }else{
-    isThreadsafe = sqlite3GlobalConfig.bFullMutex;
-  }
-  if( flags & SQLITE_OPEN_PRIVATECACHE ){
-    flags &= ~SQLITE_OPEN_SHAREDCACHE;
-  }else if( sqlite3GlobalConfig.sharedCacheEnabled ){
-    flags |= SQLITE_OPEN_SHAREDCACHE;
-  }
-
-  /* Remove harmful bits from the flags parameter
-  **
-  ** The SQLITE_OPEN_NOMUTEX and SQLITE_OPEN_FULLMUTEX flags were
-  ** dealt with in the previous code block.  Besides these, the only
-  ** valid input flags for sqlite3_open_v2() are SQLITE_OPEN_READONLY,
-  ** SQLITE_OPEN_READWRITE, and SQLITE_OPEN_CREATE.  Silently mask
-  ** off all other flags.
-  */
-  flags &=  ~( SQLITE_OPEN_DELETEONCLOSE |
-               SQLITE_OPEN_EXCLUSIVE |
-               SQLITE_OPEN_MAIN_DB |
-               SQLITE_OPEN_TEMP_DB | 
-               SQLITE_OPEN_TRANSIENT_DB | 
-               SQLITE_OPEN_MAIN_JOURNAL | 
-               SQLITE_OPEN_TEMP_JOURNAL | 
-               SQLITE_OPEN_SUBJOURNAL | 
-               SQLITE_OPEN_MASTER_JOURNAL |
-               SQLITE_OPEN_NOMUTEX |
-               SQLITE_OPEN_FULLMUTEX
-             );
-
-  /* Allocate the sqlite data structure */
-  db = sqlite3MallocZero( sizeof(sqlite3) );
-  if( db==0 ) goto opendb_out;
-  if( isThreadsafe ){
-    db->mutex = sqlite3MutexAlloc(SQLITE_MUTEX_RECURSIVE);
-    if( db->mutex==0 ){
-      sqlite3_free(db);
-      db = 0;
-      goto opendb_out;
-    }
-  }
-  sqlite3_mutex_enter(db->mutex);
-  db->errMask = 0xff;
-  db->nDb = 2;
-  db->magic = SQLITE_MAGIC_BUSY;
-  db->aDb = db->aDbStatic;
-
-  assert( sizeof(db->aLimit)==sizeof(aHardLimit) );
-  memcpy(db->aLimit, aHardLimit, sizeof(db->aLimit));
-  db->autoCommit = 1;
-  db->nextAutovac = -1;
-  db->nextPagesize = 0;
-  db->flags |= SQLITE_ShortColNames
-#if SQLITE_DEFAULT_FILE_FORMAT<4
-                 | SQLITE_LegacyFileFmt
-#endif
-#ifdef SQLITE_ENABLE_LOAD_EXTENSION
-                 | SQLITE_LoadExtension
-#endif
-#if SQLITE_DEFAULT_RECURSIVE_TRIGGERS
-                 | SQLITE_RecTriggers
-#endif
-      ;
-  sqlite3HashInit(&db->aCollSeq);
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  sqlite3HashInit(&db->aModule);
-#endif
-
-  db->pVfs = sqlite3_vfs_find(zVfs);
-  if( !db->pVfs ){
-    rc = SQLITE_ERROR;
-    sqlite3Error(db, rc, "no such vfs: %s", zVfs);
-    goto opendb_out;
-  }
-
-  /* Add the default collation sequence BINARY. BINARY works for both UTF-8
-  ** and UTF-16, so add a version for each to avoid any unnecessary
-  ** conversions. The only error that can occur here is a malloc() failure.
-  */
-  createCollation(db, "BINARY", SQLITE_UTF8, SQLITE_COLL_BINARY, 0,
-                  binCollFunc, 0);
-  createCollation(db, "BINARY", SQLITE_UTF16BE, SQLITE_COLL_BINARY, 0,
-                  binCollFunc, 0);
-  createCollation(db, "BINARY", SQLITE_UTF16LE, SQLITE_COLL_BINARY, 0,
-                  binCollFunc, 0);
-  createCollation(db, "RTRIM", SQLITE_UTF8, SQLITE_COLL_USER, (void*)1,
-                  binCollFunc, 0);
-  if( db->mallocFailed ){
-    goto opendb_out;
-  }
-  db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, "BINARY", 0);
-  assert( db->pDfltColl!=0 );
-
-  /* Also add a UTF-8 case-insensitive collation sequence. */
-  createCollation(db, "NOCASE", SQLITE_UTF8, SQLITE_COLL_NOCASE, 0,
-                  nocaseCollatingFunc, 0);
-
-  /* Open the backend database driver */
-  db->openFlags = flags;
-  rc = sqlite3BtreeFactory(db, zFilename, 0, SQLITE_DEFAULT_CACHE_SIZE, 
-                           flags | SQLITE_OPEN_MAIN_DB,
-                           &db->aDb[0].pBt);
-  if( rc!=SQLITE_OK ){
-    if( rc==SQLITE_IOERR_NOMEM ){
-      rc = SQLITE_NOMEM;
-    }
-    sqlite3Error(db, rc, 0);
-    goto opendb_out;
-  }
-  db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt);
-  db->aDb[1].pSchema = sqlite3SchemaGet(db, 0);
-
-
-  /* The default safety_level for the main database is 'full'; for the temp
-  ** database it is 'NONE'. This matches the pager layer defaults.  
-  */
-  db->aDb[0].zName = "main";
-  db->aDb[0].safety_level = 3;
-  db->aDb[1].zName = "temp";
-  db->aDb[1].safety_level = 1;
-
-  db->magic = SQLITE_MAGIC_OPEN;
-  if( db->mallocFailed ){
-    goto opendb_out;
-  }
-
-  /* Register all built-in functions, but do not attempt to read the
-  ** database schema yet. This is delayed until the first time the database
-  ** is accessed.
-  */
-  sqlite3Error(db, SQLITE_OK, 0);
-  sqlite3RegisterBuiltinFunctions(db);
-
-  /* Load automatic extensions - extensions that have been registered
-  ** using the sqlite3_automatic_extension() API.
-  */
-  sqlite3AutoLoadExtensions(db);
-  rc = sqlite3_errcode(db);
-  if( rc!=SQLITE_OK ){
-    goto opendb_out;
-  }
-
-#ifdef SQLITE_ENABLE_FTS1
-  if( !db->mallocFailed ){
-    extern int sqlite3Fts1Init(sqlite3*);
-    rc = sqlite3Fts1Init(db);
-  }
-#endif
-
-#ifdef SQLITE_ENABLE_FTS2
-  if( !db->mallocFailed && rc==SQLITE_OK ){
-    extern int sqlite3Fts2Init(sqlite3*);
-    rc = sqlite3Fts2Init(db);
-  }
-#endif
-
-#ifdef SQLITE_ENABLE_FTS3
-  if( !db->mallocFailed && rc==SQLITE_OK ){
-    rc = sqlite3Fts3Init(db);
-  }
-#endif
-
-#ifdef SQLITE_ENABLE_ICU
-  if( !db->mallocFailed && rc==SQLITE_OK ){
-    rc = sqlite3IcuInit(db);
-  }
-#endif
-
-#ifdef SQLITE_ENABLE_RTREE
-  if( !db->mallocFailed && rc==SQLITE_OK){
-    rc = sqlite3RtreeInit(db);
-  }
-#endif
-
-  sqlite3Error(db, rc, 0);
-
-  /* -DSQLITE_DEFAULT_LOCKING_MODE=1 makes EXCLUSIVE the default locking
-  ** mode.  -DSQLITE_DEFAULT_LOCKING_MODE=0 make NORMAL the default locking
-  ** mode.  Doing nothing at all also makes NORMAL the default.
-  */
-#ifdef SQLITE_DEFAULT_LOCKING_MODE
-  db->dfltLockMode = SQLITE_DEFAULT_LOCKING_MODE;
-  sqlite3PagerLockingMode(sqlite3BtreePager(db->aDb[0].pBt),
-                          SQLITE_DEFAULT_LOCKING_MODE);
-#endif
-
-  /* Enable the lookaside-malloc subsystem */
-  setupLookaside(db, 0, sqlite3GlobalConfig.szLookaside,
-                        sqlite3GlobalConfig.nLookaside);
-
-opendb_out:
-  if( db ){
-    assert( db->mutex!=0 || isThreadsafe==0 || sqlite3GlobalConfig.bFullMutex==0 );
-    sqlite3_mutex_leave(db->mutex);
-  }
-  rc = sqlite3_errcode(db);
-  if( rc==SQLITE_NOMEM ){
-    sqlite3_close(db);
-    db = 0;
-  }else if( rc!=SQLITE_OK ){
-    db->magic = SQLITE_MAGIC_SICK;
-  }
-  *ppDb = db;
-  return sqlite3ApiExit(0, rc);
-}
-
-/*
-** Open a new database handle.
-*/
-int sqlite3_open(
-  const char *zFilename, 
-  sqlite3 **ppDb 
-){
-  return openDatabase(zFilename, ppDb,
-                      SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
-}
-int sqlite3_open_v2(
-  const char *filename,   /* Database filename (UTF-8) */
-  sqlite3 **ppDb,         /* OUT: SQLite db handle */
-  int flags,              /* Flags */
-  const char *zVfs        /* Name of VFS module to use */
-){
-  return openDatabase(filename, ppDb, flags, zVfs);
-}
-
-#ifndef SQLITE_OMIT_UTF16
-/*
-** Open a new database handle.
-*/
-int sqlite3_open16(
-  const void *zFilename, 
-  sqlite3 **ppDb
-){
-  char const *zFilename8;   /* zFilename encoded in UTF-8 instead of UTF-16 */
-  sqlite3_value *pVal;
-  int rc;
-
-  assert( zFilename );
-  assert( ppDb );
-  *ppDb = 0;
-#ifndef SQLITE_OMIT_AUTOINIT
-  rc = sqlite3_initialize();
-  if( rc ) return rc;
-#endif
-  pVal = sqlite3ValueNew(0);
-  sqlite3ValueSetStr(pVal, -1, zFilename, SQLITE_UTF16NATIVE, SQLITE_STATIC);
-  zFilename8 = sqlite3ValueText(pVal, SQLITE_UTF8);
-  if( zFilename8 ){
-    rc = openDatabase(zFilename8, ppDb,
-                      SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
-    assert( *ppDb || rc==SQLITE_NOMEM );
-    if( rc==SQLITE_OK && !DbHasProperty(*ppDb, 0, DB_SchemaLoaded) ){
-      ENC(*ppDb) = SQLITE_UTF16NATIVE;
-    }
-  }else{
-    rc = SQLITE_NOMEM;
-  }
-  sqlite3ValueFree(pVal);
-
-  return sqlite3ApiExit(0, rc);
-}
-#endif /* SQLITE_OMIT_UTF16 */
-
-/*
-** Register a new collation sequence with the database handle db.
-*/
-int sqlite3_create_collation(
-  sqlite3* db, 
-  const char *zName, 
-  int enc, 
-  void* pCtx,
-  int(*xCompare)(void*,int,const void*,int,const void*)
-){
-  int rc;
-  sqlite3_mutex_enter(db->mutex);
-  assert( !db->mallocFailed );
-  rc = createCollation(db, zName, (u8)enc, SQLITE_COLL_USER, pCtx, xCompare, 0);
-  rc = sqlite3ApiExit(db, rc);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-}
-
-/*
-** Register a new collation sequence with the database handle db.
-*/
-int sqlite3_create_collation_v2(
-  sqlite3* db, 
-  const char *zName, 
-  int enc, 
-  void* pCtx,
-  int(*xCompare)(void*,int,const void*,int,const void*),
-  void(*xDel)(void*)
-){
-  int rc;
-  sqlite3_mutex_enter(db->mutex);
-  assert( !db->mallocFailed );
-  rc = createCollation(db, zName, (u8)enc, SQLITE_COLL_USER, pCtx, xCompare, xDel);
-  rc = sqlite3ApiExit(db, rc);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-}
-
-#ifndef SQLITE_OMIT_UTF16
-/*
-** Register a new collation sequence with the database handle db.
-*/
-int sqlite3_create_collation16(
-  sqlite3* db, 
-  const void *zName,
-  int enc, 
-  void* pCtx,
-  int(*xCompare)(void*,int,const void*,int,const void*)
-){
-  int rc = SQLITE_OK;
-  char *zName8;
-  sqlite3_mutex_enter(db->mutex);
-  assert( !db->mallocFailed );
-  zName8 = sqlite3Utf16to8(db, zName, -1);
-  if( zName8 ){
-    rc = createCollation(db, zName8, (u8)enc, SQLITE_COLL_USER, pCtx, xCompare, 0);
-    sqlite3DbFree(db, zName8);
-  }
-  rc = sqlite3ApiExit(db, rc);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-}
-#endif /* SQLITE_OMIT_UTF16 */
-
-/*
-** Register a collation sequence factory callback with the database handle
-** db. Replace any previously installed collation sequence factory.
-*/
-int sqlite3_collation_needed(
-  sqlite3 *db, 
-  void *pCollNeededArg, 
-  void(*xCollNeeded)(void*,sqlite3*,int eTextRep,const char*)
-){
-  sqlite3_mutex_enter(db->mutex);
-  db->xCollNeeded = xCollNeeded;
-  db->xCollNeeded16 = 0;
-  db->pCollNeededArg = pCollNeededArg;
-  sqlite3_mutex_leave(db->mutex);
-  return SQLITE_OK;
-}
-
-#ifndef SQLITE_OMIT_UTF16
-/*
-** Register a collation sequence factory callback with the database handle
-** db. Replace any previously installed collation sequence factory.
-*/
-int sqlite3_collation_needed16(
-  sqlite3 *db, 
-  void *pCollNeededArg, 
-  void(*xCollNeeded16)(void*,sqlite3*,int eTextRep,const void*)
-){
-  sqlite3_mutex_enter(db->mutex);
-  db->xCollNeeded = 0;
-  db->xCollNeeded16 = xCollNeeded16;
-  db->pCollNeededArg = pCollNeededArg;
-  sqlite3_mutex_leave(db->mutex);
-  return SQLITE_OK;
-}
-#endif /* SQLITE_OMIT_UTF16 */
-
-#ifndef SQLITE_OMIT_GLOBALRECOVER
-#ifndef SQLITE_OMIT_DEPRECATED
-/*
-** This function is now an anachronism. It used to be used to recover from a
-** malloc() failure, but SQLite now does this automatically.
-*/
-int sqlite3_global_recover(void){
-  return SQLITE_OK;
-}
-#endif
-#endif
-
-/*
-** Test to see whether or not the database connection is in autocommit
-** mode.  Return TRUE if it is and FALSE if not.  Autocommit mode is on
-** by default.  Autocommit is disabled by a BEGIN statement and reenabled
-** by the next COMMIT or ROLLBACK.
-**
-******* THIS IS AN EXPERIMENTAL API AND IS SUBJECT TO CHANGE ******
-*/
-int sqlite3_get_autocommit(sqlite3 *db){
-  return db->autoCommit;
-}
-
-#ifdef SQLITE_DEBUG
-/*
-** The following routine is subtituted for constant SQLITE_CORRUPT in
-** debugging builds.  This provides a way to set a breakpoint for when
-** corruption is first detected.
-*/
-int sqlite3Corrupt(void){
-  return SQLITE_CORRUPT;
-}
-#endif
-
-#ifndef SQLITE_OMIT_DEPRECATED
-/*
-** This is a convenience routine that makes sure that all thread-specific
-** data for this thread has been deallocated.
-**
-** SQLite no longer uses thread-specific data so this routine is now a
-** no-op.  It is retained for historical compatibility.
-*/
-void sqlite3_thread_cleanup(void){
-}
-#endif
-
-/*
-** Return meta information about a specific column of a database table.
-** See comment in sqlite3.h (sqlite.h.in) for details.
-*/
-#ifdef SQLITE_ENABLE_COLUMN_METADATA
-int sqlite3_table_column_metadata(
-  sqlite3 *db,                /* Connection handle */
-  const char *zDbName,        /* Database name or NULL */
-  const char *zTableName,     /* Table name */
-  const char *zColumnName,    /* Column name */
-  char const **pzDataType,    /* OUTPUT: Declared data type */
-  char const **pzCollSeq,     /* OUTPUT: Collation sequence name */
-  int *pNotNull,              /* OUTPUT: True if NOT NULL constraint exists */
-  int *pPrimaryKey,           /* OUTPUT: True if column part of PK */
-  int *pAutoinc               /* OUTPUT: True if column is auto-increment */
-){
-  int rc;
-  char *zErrMsg = 0;
-  Table *pTab = 0;
-  Column *pCol = 0;
-  int iCol;
-
-  char const *zDataType = 0;
-  char const *zCollSeq = 0;
-  int notnull = 0;
-  int primarykey = 0;
-  int autoinc = 0;
-
-  /* Ensure the database schema has been loaded */
-  sqlite3_mutex_enter(db->mutex);
-  (void)sqlite3SafetyOn(db);
-  sqlite3BtreeEnterAll(db);
-  rc = sqlite3Init(db, &zErrMsg);
-  if( SQLITE_OK!=rc ){
-    goto error_out;
-  }
-
-  /* Locate the table in question */
-  pTab = sqlite3FindTable(db, zTableName, zDbName);
-  if( !pTab || pTab->pSelect ){
-    pTab = 0;
-    goto error_out;
-  }
-
-  /* Find the column for which info is requested */
-  if( sqlite3IsRowid(zColumnName) ){
-    iCol = pTab->iPKey;
-    if( iCol>=0 ){
-      pCol = &pTab->aCol[iCol];
-    }
-  }else{
-    for(iCol=0; iCol<pTab->nCol; iCol++){
-      pCol = &pTab->aCol[iCol];
-      if( 0==sqlite3StrICmp(pCol->zName, zColumnName) ){
-        break;
-      }
-    }
-    if( iCol==pTab->nCol ){
-      pTab = 0;
-      goto error_out;
-    }
-  }
-
-  /* The following block stores the meta information that will be returned
-  ** to the caller in local variables zDataType, zCollSeq, notnull, primarykey
-  ** and autoinc. At this point there are two possibilities:
-  ** 
-  **     1. The specified column name was rowid", "oid" or "_rowid_" 
-  **        and there is no explicitly declared IPK column. 
-  **
-  **     2. The table is not a view and the column name identified an 
-  **        explicitly declared column. Copy meta information from *pCol.
-  */ 
-  if( pCol ){
-    zDataType = pCol->zType;
-    zCollSeq = pCol->zColl;
-    notnull = pCol->notNull!=0;
-    primarykey  = pCol->isPrimKey!=0;
-    autoinc = pTab->iPKey==iCol && (pTab->tabFlags & TF_Autoincrement)!=0;
-  }else{
-    zDataType = "INTEGER";
-    primarykey = 1;
-  }
-  if( !zCollSeq ){
-    zCollSeq = "BINARY";
-  }
-
-error_out:
-  sqlite3BtreeLeaveAll(db);
-  (void)sqlite3SafetyOff(db);
-
-  /* Whether the function call succeeded or failed, set the output parameters
-  ** to whatever their local counterparts contain. If an error did occur,
-  ** this has the effect of zeroing all output parameters.
-  */
-  if( pzDataType ) *pzDataType = zDataType;
-  if( pzCollSeq ) *pzCollSeq = zCollSeq;
-  if( pNotNull ) *pNotNull = notnull;
-  if( pPrimaryKey ) *pPrimaryKey = primarykey;
-  if( pAutoinc ) *pAutoinc = autoinc;
-
-  if( SQLITE_OK==rc && !pTab ){
-    sqlite3DbFree(db, zErrMsg);
-    zErrMsg = sqlite3MPrintf(db, "no such table column: %s.%s", zTableName,
-        zColumnName);
-    rc = SQLITE_ERROR;
-  }
-  sqlite3Error(db, rc, (zErrMsg?"%s":0), zErrMsg);
-  sqlite3DbFree(db, zErrMsg);
-  rc = sqlite3ApiExit(db, rc);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-}
-#endif
-
-/*
-** Sleep for a little while.  Return the amount of time slept.
-*/
-int sqlite3_sleep(int ms){
-  sqlite3_vfs *pVfs;
-  int rc;
-  pVfs = sqlite3_vfs_find(0);
-  if( pVfs==0 ) return 0;
-
-  /* This function works in milliseconds, but the underlying OsSleep() 
-  ** API uses microseconds. Hence the 1000's.
-  */
-  rc = (sqlite3OsSleep(pVfs, 1000*ms)/1000);
-  return rc;
-}
-
-/*
-** Enable or disable the extended result codes.
-*/
-int sqlite3_extended_result_codes(sqlite3 *db, int onoff){
-  sqlite3_mutex_enter(db->mutex);
-  db->errMask = onoff ? 0xffffffff : 0xff;
-  sqlite3_mutex_leave(db->mutex);
-  return SQLITE_OK;
-}
-
-/*
-** Invoke the xFileControl method on a particular database.
-*/
-int sqlite3_file_control(sqlite3 *db, const char *zDbName, int op, void *pArg){
-  int rc = SQLITE_ERROR;
-  int iDb;
-  sqlite3_mutex_enter(db->mutex);
-  if( zDbName==0 ){
-    iDb = 0;
-  }else{
-    for(iDb=0; iDb<db->nDb; iDb++){
-      if( strcmp(db->aDb[iDb].zName, zDbName)==0 ) break;
-    }
-  }
-  if( iDb<db->nDb ){
-    Btree *pBtree = db->aDb[iDb].pBt;
-    if( pBtree ){
-      Pager *pPager;
-      sqlite3_file *fd;
-      sqlite3BtreeEnter(pBtree);
-      pPager = sqlite3BtreePager(pBtree);
-      assert( pPager!=0 );
-      fd = sqlite3PagerFile(pPager);
-      assert( fd!=0 );
-      if( fd->pMethods ){
-        rc = sqlite3OsFileControl(fd, op, pArg);
-      }
-      sqlite3BtreeLeave(pBtree);
-    }
-  }
-  sqlite3_mutex_leave(db->mutex);
-  return rc;   
-}
-
-/*
-** Interface to the testing logic.
-*/
-int sqlite3_test_control(int op, ...){
-  int rc = 0;
-#ifndef SQLITE_OMIT_BUILTIN_TEST
-  va_list ap;
-  va_start(ap, op);
-  switch( op ){
-
-    /*
-    ** Save the current state of the PRNG.
-    */
-    case SQLITE_TESTCTRL_PRNG_SAVE: {
-      sqlite3PrngSaveState();
-      break;
-    }
-
-    /*
-    ** Restore the state of the PRNG to the last state saved using
-    ** PRNG_SAVE.  If PRNG_SAVE has never before been called, then
-    ** this verb acts like PRNG_RESET.
-    */
-    case SQLITE_TESTCTRL_PRNG_RESTORE: {
-      sqlite3PrngRestoreState();
-      break;
-    }
-
-    /*
-    ** Reset the PRNG back to its uninitialized state.  The next call
-    ** to sqlite3_randomness() will reseed the PRNG using a single call
-    ** to the xRandomness method of the default VFS.
-    */
-    case SQLITE_TESTCTRL_PRNG_RESET: {
-      sqlite3PrngResetState();
-      break;
-    }
-
-    /*
-    **  sqlite3_test_control(BITVEC_TEST, size, program)
-    **
-    ** Run a test against a Bitvec object of size.  The program argument
-    ** is an array of integers that defines the test.  Return -1 on a
-    ** memory allocation error, 0 on success, or non-zero for an error.
-    ** See the sqlite3BitvecBuiltinTest() for additional information.
-    */
-    case SQLITE_TESTCTRL_BITVEC_TEST: {
-      int sz = va_arg(ap, int);
-      int *aProg = va_arg(ap, int*);
-      rc = sqlite3BitvecBuiltinTest(sz, aProg);
-      break;
-    }
-
-    /*
-    **  sqlite3_test_control(BENIGN_MALLOC_HOOKS, xBegin, xEnd)
-    **
-    ** Register hooks to call to indicate which malloc() failures 
-    ** are benign.
-    */
-    case SQLITE_TESTCTRL_BENIGN_MALLOC_HOOKS: {
-      typedef void (*void_function)(void);
-      void_function xBenignBegin;
-      void_function xBenignEnd;
-      xBenignBegin = va_arg(ap, void_function);
-      xBenignEnd = va_arg(ap, void_function);
-      sqlite3BenignMallocHooks(xBenignBegin, xBenignEnd);
-      break;
-    }
-
-    /*
-    **  sqlite3_test_control(SQLITE_TESTCTRL_PENDING_BYTE, unsigned int X)
-    **
-    ** Set the PENDING byte to the value in the argument, if X>0.
-    ** Make no changes if X==0.  Return the value of the pending byte
-    ** as it existing before this routine was called.
-    **
-    ** IMPORTANT:  Changing the PENDING byte from 0x40000000 results in
-    ** an incompatible database file format.  Changing the PENDING byte
-    ** while any database connection is open results in undefined and
-    ** dileterious behavior.
-    */
-    case SQLITE_TESTCTRL_PENDING_BYTE: {
-      unsigned int newVal = va_arg(ap, unsigned int);
-      rc = sqlite3PendingByte;
-      if( newVal ) sqlite3PendingByte = newVal;
-      break;
-    }
-
-    /*
-    **  sqlite3_test_control(SQLITE_TESTCTRL_ASSERT, int X)
-    **
-    ** This action provides a run-time test to see whether or not
-    ** assert() was enabled at compile-time.  If X is true and assert()
-    ** is enabled, then the return value is true.  If X is true and
-    ** assert() is disabled, then the return value is zero.  If X is
-    ** false and assert() is enabled, then the assertion fires and the
-    ** process aborts.  If X is false and assert() is disabled, then the
-    ** return value is zero.
-    */
-    case SQLITE_TESTCTRL_ASSERT: {
-      volatile int x = 0;
-      assert( (x = va_arg(ap,int))!=0 );
-      rc = x;
-      break;
-    }
-
-
-    /*
-    **  sqlite3_test_control(SQLITE_TESTCTRL_ALWAYS, int X)
-    **
-    ** This action provides a run-time test to see how the ALWAYS and
-    ** NEVER macros were defined at compile-time.
-    **
-    ** The return value is ALWAYS(X).  
-    **
-    ** The recommended test is X==2.  If the return value is 2, that means
-    ** ALWAYS() and NEVER() are both no-op pass-through macros, which is the
-    ** default setting.  If the return value is 1, then ALWAYS() is either
-    ** hard-coded to true or else it asserts if its argument is false.
-    ** The first behavior (hard-coded to true) is the case if
-    ** SQLITE_TESTCTRL_ASSERT shows that assert() is disabled and the second
-    ** behavior (assert if the argument to ALWAYS() is false) is the case if
-    ** SQLITE_TESTCTRL_ASSERT shows that assert() is enabled.
-    **
-    ** The run-time test procedure might look something like this:
-    **
-    **    if( sqlite3_test_control(SQLITE_TESTCTRL_ALWAYS, 2)==2 ){
-    **      // ALWAYS() and NEVER() are no-op pass-through macros
-    **    }else if( sqlite3_test_control(SQLITE_TESTCTRL_ASSERT, 1) ){
-    **      // ALWAYS(x) asserts that x is true. NEVER(x) asserts x is false.
-    **    }else{
-    **      // ALWAYS(x) is a constant 1.  NEVER(x) is a constant 0.
-    **    }
-    */
-    case SQLITE_TESTCTRL_ALWAYS: {
-      int x = va_arg(ap,int);
-      rc = ALWAYS(x);
-      break;
-    }
-
-    /*   sqlite3_test_control(SQLITE_TESTCTRL_RESERVE, sqlite3 *db, int N)
-    **
-    ** Set the nReserve size to N for the main database on the database
-    ** connection db.
-    */
-    case SQLITE_TESTCTRL_RESERVE: {
-      sqlite3 *db = va_arg(ap, sqlite3*);
-      int x = va_arg(ap,int);
-      sqlite3_mutex_enter(db->mutex);
-      sqlite3BtreeSetPageSize(db->aDb[0].pBt, 0, x, 0);
-      sqlite3_mutex_leave(db->mutex);
-      break;
-    }
-
-  }
-  va_end(ap);
-#endif /* SQLITE_OMIT_BUILTIN_TEST */
-  return rc;
-}