[sql] Remove SQLite 3.10.2 reference directory.

third_party/sqlite/sqlite-src-3100200/src/main.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.
-**
-*************************************************************************
-** 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 "fts3.h"
-#endif
-#ifdef SQLITE_ENABLE_RTREE
-# include "rtree.h"
-#endif
-#ifdef SQLITE_ENABLE_ICU
-# include "sqliteicu.h"
-#endif
-#ifdef SQLITE_ENABLE_JSON1
-int sqlite3Json1Init(sqlite3*);
-#endif
-#ifdef SQLITE_ENABLE_FTS5
-int sqlite3Fts5Init(sqlite3*);
-#endif
-
-#ifndef SQLITE_AMALGAMATION
-/* IMPLEMENTATION-OF: R-46656-45156 The sqlite3_version[] string constant
-** contains the text of SQLITE_VERSION macro. 
-*/
-const char sqlite3_version[] = SQLITE_VERSION;
-#endif
-
-/* IMPLEMENTATION-OF: R-53536-42575 The sqlite3_libversion() function returns
-** a pointer to the to the sqlite3_version[] string constant. 
-*/
-const char *sqlite3_libversion(void){ return sqlite3_version; }
-
-/* IMPLEMENTATION-OF: R-63124-39300 The sqlite3_sourceid() function returns a
-** pointer to a string constant whose value is the same as the
-** SQLITE_SOURCE_ID C preprocessor macro. 
-*/
-const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
-
-/* IMPLEMENTATION-OF: R-35210-63508 The sqlite3_libversion_number() function
-** returns an integer equal to SQLITE_VERSION_NUMBER.
-*/
-int sqlite3_libversion_number(void){ return SQLITE_VERSION_NUMBER; }
-
-/* IMPLEMENTATION-OF: R-20790-14025 The sqlite3_threadsafe() function returns
-** zero if and only if SQLite was compiled with mutexing code omitted due to
-** the SQLITE_THREADSAFE compile-time option being set to 0.
-*/
-int sqlite3_threadsafe(void){ return SQLITE_THREADSAFE; }
-
-/*
-** When compiling the test fixture or with debugging enabled (on Win32),
-** this variable being set to non-zero will cause OSTRACE macros to emit
-** extra diagnostic information.
-*/
-#ifdef SQLITE_HAVE_OS_TRACE
-# ifndef SQLITE_DEBUG_OS_TRACE
-#   define SQLITE_DEBUG_OS_TRACE 0
-# endif
-  int sqlite3OSTrace = SQLITE_DEBUG_OS_TRACE;
-#endif
-
-#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.
-*/
-SQLITE_API void (SQLITE_CDECL *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;
-
-/*
-** If the following global variable points to a string which is the
-** name of a directory, then that directory will be used to store
-** all database files specified with a relative pathname.
-**
-** See also the "PRAGMA data_store_directory" SQL command.
-*/
-char *sqlite3_data_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){
-  MUTEX_LOGIC( sqlite3_mutex *pMaster; )       /* The main static mutex */
-  int rc;                                      /* Result code */
-#ifdef SQLITE_EXTRA_INIT
-  int bRunExtraInit = 0;                       /* Extra initialization needed */
-#endif
-
-#ifdef SQLITE_OMIT_WSD
-  rc = sqlite3_wsd_init(4096, 24);
-  if( rc!=SQLITE_OK ){
-    return rc;
-  }
-#endif
-
-  /* If the following assert() fails on some obscure processor/compiler
-  ** combination, the work-around is to set the correct pointer
-  ** size at compile-time using -DSQLITE_PTRSIZE=n compile-time option */
-  assert( SQLITE_PTRSIZE==sizeof(char*) );
-
-  /* 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.
-  */
-  MUTEX_LOGIC( 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.
-  **
-  ** IMPLEMENTATION-OF: R-00140-37445 SQLite automatically serializes calls
-  ** to the xInit method, so the xInit method need not be threadsafe.
-  **
-  ** The following mutex is what serializes access to the appdef pcache xInit
-  ** methods.  The sqlite3_pcache_methods.xInit() all is embedded in the
-  ** call to sqlite3PcacheInitialize().
-  */
-  sqlite3_mutex_enter(sqlite3GlobalConfig.pInitMutex);
-  if( sqlite3GlobalConfig.isInit==0 && sqlite3GlobalConfig.inProgress==0 ){
-    FuncDefHash *pHash = &GLOBAL(FuncDefHash, sqlite3GlobalFunctions);
-    sqlite3GlobalConfig.inProgress = 1;
-#ifdef SQLITE_ENABLE_SQLLOG
-    {
-      extern void sqlite3_init_sqllog(void);
-      sqlite3_init_sqllog();
-    }
-#endif
-    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;
-#ifdef SQLITE_EXTRA_INIT
-      bRunExtraInit = 1;
-#endif
-    }
-    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
-
-  /* Do extra initialization steps requested by the SQLITE_EXTRA_INIT
-  ** compile-time option.
-  */
-#ifdef SQLITE_EXTRA_INIT
-  if( bRunExtraInit ){
-    int SQLITE_EXTRA_INIT(const char*);
-    rc = SQLITE_EXTRA_INIT(0);
-  }
-#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){
-#ifdef SQLITE_OMIT_WSD
-  int rc = sqlite3_wsd_init(4096, 24);
-  if( rc!=SQLITE_OK ){
-    return rc;
-  }
-#endif
-
-  if( sqlite3GlobalConfig.isInit ){
-#ifdef SQLITE_EXTRA_SHUTDOWN
-    void SQLITE_EXTRA_SHUTDOWN(void);
-    SQLITE_EXTRA_SHUTDOWN();
-#endif
-    sqlite3_os_end();
-    sqlite3_reset_auto_extension();
-    sqlite3GlobalConfig.isInit = 0;
-  }
-  if( sqlite3GlobalConfig.isPCacheInit ){
-    sqlite3PcacheShutdown();
-    sqlite3GlobalConfig.isPCacheInit = 0;
-  }
-  if( sqlite3GlobalConfig.isMallocInit ){
-    sqlite3MallocEnd();
-    sqlite3GlobalConfig.isMallocInit = 0;
-
-#ifndef SQLITE_OMIT_SHUTDOWN_DIRECTORIES
-    /* The heap subsystem has now been shutdown and these values are supposed
-    ** to be NULL or point to memory that was obtained from sqlite3_malloc(),
-    ** which would rely on that heap subsystem; therefore, make sure these
-    ** values cannot refer to heap memory that was just invalidated when the
-    ** heap subsystem was shutdown.  This is only done if the current call to
-    ** this function resulted in the heap subsystem actually being shutdown.
-    */
-    sqlite3_data_directory = 0;
-    sqlite3_temp_directory = 0;
-#endif
-  }
-  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_BKPT;
-
-  va_start(ap, op);
-  switch( op ){
-
-    /* Mutex configuration options are only available in a threadsafe
-    ** compile.
-    */
-#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0  /* IMP: R-54466-46756 */
-    case SQLITE_CONFIG_SINGLETHREAD: {
-      /* EVIDENCE-OF: R-02748-19096 This option sets the threading mode to
-      ** Single-thread. */
-      sqlite3GlobalConfig.bCoreMutex = 0;  /* Disable mutex on core */
-      sqlite3GlobalConfig.bFullMutex = 0;  /* Disable mutex on connections */
-      break;
-    }
-#endif
-#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-20520-54086 */
-    case SQLITE_CONFIG_MULTITHREAD: {
-      /* EVIDENCE-OF: R-14374-42468 This option sets the threading mode to
-      ** Multi-thread. */
-      sqlite3GlobalConfig.bCoreMutex = 1;  /* Enable mutex on core */
-      sqlite3GlobalConfig.bFullMutex = 0;  /* Disable mutex on connections */
-      break;
-    }
-#endif
-#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-59593-21810 */
-    case SQLITE_CONFIG_SERIALIZED: {
-      /* EVIDENCE-OF: R-41220-51800 This option sets the threading mode to
-      ** Serialized. */
-      sqlite3GlobalConfig.bCoreMutex = 1;  /* Enable mutex on core */
-      sqlite3GlobalConfig.bFullMutex = 1;  /* Enable mutex on connections */
-      break;
-    }
-#endif
-#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-63666-48755 */
-    case SQLITE_CONFIG_MUTEX: {
-      /* Specify an alternative mutex implementation */
-      sqlite3GlobalConfig.mutex = *va_arg(ap, sqlite3_mutex_methods*);
-      break;
-    }
-#endif
-#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-14450-37597 */
-    case SQLITE_CONFIG_GETMUTEX: {
-      /* Retrieve the current mutex implementation */
-      *va_arg(ap, sqlite3_mutex_methods*) = sqlite3GlobalConfig.mutex;
-      break;
-    }
-#endif
-
-    case SQLITE_CONFIG_MALLOC: {
-      /* EVIDENCE-OF: R-55594-21030 The SQLITE_CONFIG_MALLOC option takes a
-      ** single argument which is a pointer to an instance of the
-      ** sqlite3_mem_methods structure. The argument specifies alternative
-      ** low-level memory allocation routines to be used in place of the memory
-      ** allocation routines built into SQLite. */
-      sqlite3GlobalConfig.m = *va_arg(ap, sqlite3_mem_methods*);
-      break;
-    }
-    case SQLITE_CONFIG_GETMALLOC: {
-      /* EVIDENCE-OF: R-51213-46414 The SQLITE_CONFIG_GETMALLOC option takes a
-      ** single argument which is a pointer to an instance of the
-      ** sqlite3_mem_methods structure. The sqlite3_mem_methods structure is
-      ** filled with the currently defined memory allocation routines. */
-      if( sqlite3GlobalConfig.m.xMalloc==0 ) sqlite3MemSetDefault();
-      *va_arg(ap, sqlite3_mem_methods*) = sqlite3GlobalConfig.m;
-      break;
-    }
-    case SQLITE_CONFIG_MEMSTATUS: {
-      /* EVIDENCE-OF: R-61275-35157 The SQLITE_CONFIG_MEMSTATUS option takes
-      ** single argument of type int, interpreted as a boolean, which enables
-      ** or disables the collection of memory allocation statistics. */
-      sqlite3GlobalConfig.bMemstat = va_arg(ap, int);
-      break;
-    }
-    case SQLITE_CONFIG_SCRATCH: {
-      /* EVIDENCE-OF: R-08404-60887 There are three arguments to
-      ** SQLITE_CONFIG_SCRATCH: A pointer an 8-byte aligned memory buffer from
-      ** which the scratch allocations will be drawn, the size of each scratch
-      ** allocation (sz), and the maximum number of scratch allocations (N). */
-      sqlite3GlobalConfig.pScratch = va_arg(ap, void*);
-      sqlite3GlobalConfig.szScratch = va_arg(ap, int);
-      sqlite3GlobalConfig.nScratch = va_arg(ap, int);
-      break;
-    }
-    case SQLITE_CONFIG_PAGECACHE: {
-      /* EVIDENCE-OF: R-18761-36601 There are three arguments to
-      ** SQLITE_CONFIG_PAGECACHE: A pointer to 8-byte aligned memory (pMem),
-      ** the size of each page cache line (sz), and the number of cache lines
-      ** (N). */
-      sqlite3GlobalConfig.pPage = va_arg(ap, void*);
-      sqlite3GlobalConfig.szPage = va_arg(ap, int);
-      sqlite3GlobalConfig.nPage = va_arg(ap, int);
-      break;
-    }
-    case SQLITE_CONFIG_PCACHE_HDRSZ: {
-      /* EVIDENCE-OF: R-39100-27317 The SQLITE_CONFIG_PCACHE_HDRSZ option takes
-      ** a single parameter which is a pointer to an integer and writes into
-      ** that integer the number of extra bytes per page required for each page
-      ** in SQLITE_CONFIG_PAGECACHE. */
-      *va_arg(ap, int*) = 
-          sqlite3HeaderSizeBtree() +
-          sqlite3HeaderSizePcache() +
-          sqlite3HeaderSizePcache1();
-      break;
-    }
-
-    case SQLITE_CONFIG_PCACHE: {
-      /* no-op */
-      break;
-    }
-    case SQLITE_CONFIG_GETPCACHE: {
-      /* now an error */
-      rc = SQLITE_ERROR;
-      break;
-    }
-
-    case SQLITE_CONFIG_PCACHE2: {
-      /* EVIDENCE-OF: R-63325-48378 The SQLITE_CONFIG_PCACHE2 option takes a
-      ** single argument which is a pointer to an sqlite3_pcache_methods2
-      ** object. This object specifies the interface to a custom page cache
-      ** implementation. */
-      sqlite3GlobalConfig.pcache2 = *va_arg(ap, sqlite3_pcache_methods2*);
-      break;
-    }
-    case SQLITE_CONFIG_GETPCACHE2: {
-      /* EVIDENCE-OF: R-22035-46182 The SQLITE_CONFIG_GETPCACHE2 option takes a
-      ** single argument which is a pointer to an sqlite3_pcache_methods2
-      ** object. SQLite copies of the current page cache implementation into
-      ** that object. */
-      if( sqlite3GlobalConfig.pcache2.xInit==0 ){
-        sqlite3PCacheSetDefault();
-      }
-      *va_arg(ap, sqlite3_pcache_methods2*) = sqlite3GlobalConfig.pcache2;
-      break;
-    }
-
-/* EVIDENCE-OF: R-06626-12911 The SQLITE_CONFIG_HEAP option is only
-** available if SQLite is compiled with either SQLITE_ENABLE_MEMSYS3 or
-** SQLITE_ENABLE_MEMSYS5 and returns SQLITE_ERROR if invoked otherwise. */
-#if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5)
-    case SQLITE_CONFIG_HEAP: {
-      /* EVIDENCE-OF: R-19854-42126 There are three arguments to
-      ** SQLITE_CONFIG_HEAP: An 8-byte aligned pointer to the memory, the
-      ** number of bytes in the memory buffer, and the minimum allocation size.
-      */
-      sqlite3GlobalConfig.pHeap = va_arg(ap, void*);
-      sqlite3GlobalConfig.nHeap = va_arg(ap, int);
-      sqlite3GlobalConfig.mnReq = va_arg(ap, int);
-
-      if( sqlite3GlobalConfig.mnReq<1 ){
-        sqlite3GlobalConfig.mnReq = 1;
-      }else if( sqlite3GlobalConfig.mnReq>(1<<12) ){
-        /* cap min request size at 2^12 */
-        sqlite3GlobalConfig.mnReq = (1<<12);
-      }
-
-      if( sqlite3GlobalConfig.pHeap==0 ){
-        /* EVIDENCE-OF: R-49920-60189 If the first pointer (the memory pointer)
-        ** is NULL, then SQLite reverts to using its default memory allocator
-        ** (the system malloc() implementation), undoing any prior invocation of
-        ** SQLITE_CONFIG_MALLOC.
-        **
-        ** Setting sqlite3GlobalConfig.m to all zeros will cause malloc to
-        ** revert to its default implementation when sqlite3_initialize() is run
-        */
-        memset(&sqlite3GlobalConfig.m, 0, sizeof(sqlite3GlobalConfig.m));
-      }else{
-        /* EVIDENCE-OF: R-61006-08918 If the memory pointer is not NULL then the
-        ** alternative memory allocator is engaged to handle all of SQLites
-        ** memory allocation needs. */
-#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;
-    }
-    
-    /* Record a pointer to the logger function and its first argument.
-    ** The default is NULL.  Logging is disabled if the function pointer is
-    ** NULL.
-    */
-    case SQLITE_CONFIG_LOG: {
-      /* MSVC is picky about pulling func ptrs from va lists.
-      ** http://support.microsoft.com/kb/47961
-      ** sqlite3GlobalConfig.xLog = va_arg(ap, void(*)(void*,int,const char*));
-      */
-      typedef void(*LOGFUNC_t)(void*,int,const char*);
-      sqlite3GlobalConfig.xLog = va_arg(ap, LOGFUNC_t);
-      sqlite3GlobalConfig.pLogArg = va_arg(ap, void*);
-      break;
-    }
-
-    /* EVIDENCE-OF: R-55548-33817 The compile-time setting for URI filenames
-    ** can be changed at start-time using the
-    ** sqlite3_config(SQLITE_CONFIG_URI,1) or
-    ** sqlite3_config(SQLITE_CONFIG_URI,0) configuration calls.
-    */
-    case SQLITE_CONFIG_URI: {
-      /* EVIDENCE-OF: R-25451-61125 The SQLITE_CONFIG_URI option takes a single
-      ** argument of type int. If non-zero, then URI handling is globally
-      ** enabled. If the parameter is zero, then URI handling is globally
-      ** disabled. */
-      sqlite3GlobalConfig.bOpenUri = va_arg(ap, int);
-      break;
-    }
-
-    case SQLITE_CONFIG_COVERING_INDEX_SCAN: {
-      /* EVIDENCE-OF: R-36592-02772 The SQLITE_CONFIG_COVERING_INDEX_SCAN
-      ** option takes a single integer argument which is interpreted as a
-      ** boolean in order to enable or disable the use of covering indices for
-      ** full table scans in the query optimizer. */
-      sqlite3GlobalConfig.bUseCis = va_arg(ap, int);
-      break;
-    }
-
-#ifdef SQLITE_ENABLE_SQLLOG
-    case SQLITE_CONFIG_SQLLOG: {
-      typedef void(*SQLLOGFUNC_t)(void*, sqlite3*, const char*, int);
-      sqlite3GlobalConfig.xSqllog = va_arg(ap, SQLLOGFUNC_t);
-      sqlite3GlobalConfig.pSqllogArg = va_arg(ap, void *);
-      break;
-    }
-#endif
-
-    case SQLITE_CONFIG_MMAP_SIZE: {
-      /* EVIDENCE-OF: R-58063-38258 SQLITE_CONFIG_MMAP_SIZE takes two 64-bit
-      ** integer (sqlite3_int64) values that are the default mmap size limit
-      ** (the default setting for PRAGMA mmap_size) and the maximum allowed
-      ** mmap size limit. */
-      sqlite3_int64 szMmap = va_arg(ap, sqlite3_int64);
-      sqlite3_int64 mxMmap = va_arg(ap, sqlite3_int64);
-      /* EVIDENCE-OF: R-53367-43190 If either argument to this option is
-      ** negative, then that argument is changed to its compile-time default.
-      **
-      ** EVIDENCE-OF: R-34993-45031 The maximum allowed mmap size will be
-      ** silently truncated if necessary so that it does not exceed the
-      ** compile-time maximum mmap size set by the SQLITE_MAX_MMAP_SIZE
-      ** compile-time option.
-      */
-      if( mxMmap<0 || mxMmap>SQLITE_MAX_MMAP_SIZE ){
-        mxMmap = SQLITE_MAX_MMAP_SIZE;
-      }
-      if( szMmap<0 ) szMmap = SQLITE_DEFAULT_MMAP_SIZE;
-      if( szMmap>mxMmap) szMmap = mxMmap;
-      sqlite3GlobalConfig.mxMmap = mxMmap;
-      sqlite3GlobalConfig.szMmap = szMmap;
-      break;
-    }
-
-#if SQLITE_OS_WIN && defined(SQLITE_WIN32_MALLOC) /* IMP: R-04780-55815 */
-    case SQLITE_CONFIG_WIN32_HEAPSIZE: {
-      /* EVIDENCE-OF: R-34926-03360 SQLITE_CONFIG_WIN32_HEAPSIZE takes a 32-bit
-      ** unsigned integer value that specifies the maximum size of the created
-      ** heap. */
-      sqlite3GlobalConfig.nHeap = va_arg(ap, int);
-      break;
-    }
-#endif
-
-    case SQLITE_CONFIG_PMASZ: {
-      sqlite3GlobalConfig.szPma = va_arg(ap, unsigned 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){
-#ifndef SQLITE_OMIT_LOOKASIDE
-  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 after ROUNDDOWN8 needs to be larger
-  ** than a pointer to be useful.
-  */
-  sz = ROUNDDOWN8(sz);  /* IMP: R-33038-09382 */
-  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 ){
-    sqlite3BeginBenignMalloc();
-    pStart = sqlite3Malloc( sz*cnt );  /* IMP: R-61949-35727 */
-    sqlite3EndBenignMalloc();
-    if( pStart ) cnt = sqlite3MallocSize(pStart)/sz;
-  }else{
-    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.pStart = db;
-    db->lookaside.pEnd = db;
-    db->lookaside.bEnabled = 0;
-    db->lookaside.bMalloced = 0;
-  }
-#endif /* SQLITE_OMIT_LOOKASIDE */
-  return SQLITE_OK;
-}
-
-/*
-** Return the mutex associated with a database connection.
-*/
-sqlite3_mutex *sqlite3_db_mutex(sqlite3 *db){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  return db->mutex;
-}
-
-/*
-** Free up as much memory as we can from the given database
-** connection.
-*/
-int sqlite3_db_release_memory(sqlite3 *db){
-  int i;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  sqlite3BtreeEnterAll(db);
-  for(i=0; i<db->nDb; i++){
-    Btree *pBt = db->aDb[i].pBt;
-    if( pBt ){
-      Pager *pPager = sqlite3BtreePager(pBt);
-      sqlite3PagerShrink(pPager);
-    }
-  }
-  sqlite3BtreeLeaveAll(db);
-  sqlite3_mutex_leave(db->mutex);
-  return SQLITE_OK;
-}
-
-/*
-** Flush any dirty pages in the pager-cache for any attached database
-** to disk.
-*/
-int sqlite3_db_cacheflush(sqlite3 *db){
-  int i;
-  int rc = SQLITE_OK;
-  int bSeenBusy = 0;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  sqlite3BtreeEnterAll(db);
-  for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
-    Btree *pBt = db->aDb[i].pBt;
-    if( pBt && sqlite3BtreeIsInTrans(pBt) ){
-      Pager *pPager = sqlite3BtreePager(pBt);
-      rc = sqlite3PagerFlush(pPager);
-      if( rc==SQLITE_BUSY ){
-        bSeenBusy = 1;
-        rc = SQLITE_OK;
-      }
-    }
-  }
-  sqlite3BtreeLeaveAll(db);
-  sqlite3_mutex_leave(db->mutex);
-  return ((rc==SQLITE_OK && bSeenBusy) ? SQLITE_BUSY : rc);
-}
-
-/*
-** 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*); /* IMP: R-26835-10964 */
-      int sz = va_arg(ap, int);       /* IMP: R-47871-25994 */
-      int cnt = va_arg(ap, int);      /* IMP: R-04460-53386 */
-      rc = setupLookaside(db, pBuf, sz, cnt);
-      break;
-    }
-    default: {
-      static const struct {
-        int op;      /* The opcode */
-        u32 mask;    /* Mask of the bit in sqlite3.flags to set/clear */
-      } aFlagOp[] = {
-        { SQLITE_DBCONFIG_ENABLE_FKEY,    SQLITE_ForeignKeys    },
-        { SQLITE_DBCONFIG_ENABLE_TRIGGER, SQLITE_EnableTrigger  },
-      };
-      unsigned int i;
-      rc = SQLITE_ERROR; /* IMP: R-42790-23372 */
-      for(i=0; i<ArraySize(aFlagOp); i++){
-        if( aFlagOp[i].op==op ){
-          int onoff = va_arg(ap, int);
-          int *pRes = va_arg(ap, int*);
-          int oldFlags = db->flags;
-          if( onoff>0 ){
-            db->flags |= aFlagOp[i].mask;
-          }else if( onoff==0 ){
-            db->flags &= ~aFlagOp[i].mask;
-          }
-          if( oldFlags!=db->flags ){
-            sqlite3ExpirePreparedStatements(db);
-          }
-          if( pRes ){
-            *pRes = (db->flags & aFlagOp[i].mask)!=0;
-          }
-          rc = SQLITE_OK;
-          break;
-        }
-      }
-      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;
-  /* EVIDENCE-OF: R-65033-28449 The built-in BINARY collation compares
-  ** strings byte by byte using the memcmp() function from the standard C
-  ** library. */
-  rc = memcmp(pKey1, pKey2, n);
-  if( rc==0 ){
-    if( padFlag
-     && allSpaces(((char*)pKey1)+n, nKey1-n)
-     && allSpaces(((char*)pKey2)+n, nKey2-n)
-    ){
-      /* EVIDENCE-OF: R-31624-24737 RTRIM is like BINARY except that extra
-      ** spaces at the end of either string do not change the result. In other
-      ** words, strings will compare equal to one another as long as they
-      ** differ only in the number of spaces at the end.
-      */
-    }else{
-      rc = nKey1 - nKey2;
-    }
-  }
-  return rc;
-}
-
-/*
-** Another built-in collating sequence: NOCASE. 
-**
-** This collating sequence is intended to be used for "case independent
-** 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){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  return db->lastRowid;
-}
-
-/*
-** Return the number of changes in the most recent call to sqlite3_exec().
-*/
-int sqlite3_changes(sqlite3 *db){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  return db->nChange;
-}
-
-/*
-** Return the number of changes since the database handle was opened.
-*/
-int sqlite3_total_changes(sqlite3 *db){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  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;
-}
-
-/*
-** Invoke the destructor function associated with FuncDef p, if any. Except,
-** if this is not the last copy of the function, do not invoke it. Multiple
-** copies of a single function are created when create_function() is called
-** with SQLITE_ANY as the encoding.
-*/
-static void functionDestroy(sqlite3 *db, FuncDef *p){
-  FuncDestructor *pDestructor = p->pDestructor;
-  if( pDestructor ){
-    pDestructor->nRef--;
-    if( pDestructor->nRef==0 ){
-      pDestructor->xDestroy(pDestructor->pUserData);
-      sqlite3DbFree(db, pDestructor);
-    }
-  }
-}
-
-/*
-** Disconnect all sqlite3_vtab objects that belong to database connection
-** db. This is called when db is being closed.
-*/
-static void disconnectAllVtab(sqlite3 *db){
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  int i;
-  HashElem *p;
-  sqlite3BtreeEnterAll(db);
-  for(i=0; i<db->nDb; i++){
-    Schema *pSchema = db->aDb[i].pSchema;
-    if( db->aDb[i].pSchema ){
-      for(p=sqliteHashFirst(&pSchema->tblHash); p; p=sqliteHashNext(p)){
-        Table *pTab = (Table *)sqliteHashData(p);
-        if( IsVirtual(pTab) ) sqlite3VtabDisconnect(db, pTab);
-      }
-    }
-  }
-  for(p=sqliteHashFirst(&db->aModule); p; p=sqliteHashNext(p)){
-    Module *pMod = (Module *)sqliteHashData(p);
-    if( pMod->pEpoTab ){
-      sqlite3VtabDisconnect(db, pMod->pEpoTab);
-    }
-  }
-  sqlite3VtabUnlockList(db);
-  sqlite3BtreeLeaveAll(db);
-#else
-  UNUSED_PARAMETER(db);
-#endif
-}
-
-/*
-** Return TRUE if database connection db has unfinalized prepared
-** statements or unfinished sqlite3_backup objects.  
-*/
-static int connectionIsBusy(sqlite3 *db){
-  int j;
-  assert( sqlite3_mutex_held(db->mutex) );
-  if( db->pVdbe ) return 1;
-  for(j=0; j<db->nDb; j++){
-    Btree *pBt = db->aDb[j].pBt;
-    if( pBt && sqlite3BtreeIsInBackup(pBt) ) return 1;
-  }
-  return 0;
-}
-
-/*
-** Close an existing SQLite database
-*/
-static int sqlite3Close(sqlite3 *db, int forceZombie){
-  if( !db ){
-    /* EVIDENCE-OF: R-63257-11740 Calling sqlite3_close() or
-    ** sqlite3_close_v2() with a NULL pointer argument is a harmless no-op. */
-    return SQLITE_OK;
-  }
-  if( !sqlite3SafetyCheckSickOrOk(db) ){
-    return SQLITE_MISUSE_BKPT;
-  }
-  sqlite3_mutex_enter(db->mutex);
-
-  /* Force xDisconnect calls on all virtual tables */
-  disconnectAllVtab(db);
-
-  /* If a transaction is open, the disconnectAllVtab() 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);
-
-  /* Legacy behavior (sqlite3_close() behavior) is to return
-  ** SQLITE_BUSY if the connection can not be closed immediately.
-  */
-  if( !forceZombie && connectionIsBusy(db) ){
-    sqlite3ErrorWithMsg(db, SQLITE_BUSY, "unable to close due to unfinalized "
-       "statements or unfinished backups");
-    sqlite3_mutex_leave(db->mutex);
-    return SQLITE_BUSY;
-  }
-
-#ifdef SQLITE_ENABLE_SQLLOG
-  if( sqlite3GlobalConfig.xSqllog ){
-    /* Closing the handle. Fourth parameter is passed the value 2. */
-    sqlite3GlobalConfig.xSqllog(sqlite3GlobalConfig.pSqllogArg, db, 0, 2);
-  }
-#endif
-
-  /* Convert the connection into a zombie and then close it.
-  */
-  db->magic = SQLITE_MAGIC_ZOMBIE;
-  sqlite3LeaveMutexAndCloseZombie(db);
-  return SQLITE_OK;
-}
-
-/*
-** Two variations on the public interface for closing a database
-** connection. The sqlite3_close() version returns SQLITE_BUSY and
-** leaves the connection option if there are unfinalized prepared
-** statements or unfinished sqlite3_backups.  The sqlite3_close_v2()
-** version forces the connection to become a zombie if there are
-** unclosed resources, and arranges for deallocation when the last
-** prepare statement or sqlite3_backup closes.
-*/
-int sqlite3_close(sqlite3 *db){ return sqlite3Close(db,0); }
-int sqlite3_close_v2(sqlite3 *db){ return sqlite3Close(db,1); }
-
-
-/*
-** Close the mutex on database connection db.
-**
-** Furthermore, if database connection db is a zombie (meaning that there
-** has been a prior call to sqlite3_close(db) or sqlite3_close_v2(db)) and
-** every sqlite3_stmt has now been finalized and every sqlite3_backup has
-** finished, then free all resources.
-*/
-void sqlite3LeaveMutexAndCloseZombie(sqlite3 *db){
-  HashElem *i;                    /* Hash table iterator */
-  int j;
-
-  /* If there are outstanding sqlite3_stmt or sqlite3_backup objects
-  ** or if the connection has not yet been closed by sqlite3_close_v2(),
-  ** then just leave the mutex and return.
-  */
-  if( db->magic!=SQLITE_MAGIC_ZOMBIE || connectionIsBusy(db) ){
-    sqlite3_mutex_leave(db->mutex);
-    return;
-  }
-
-  /* If we reach this point, it means that the database connection has
-  ** closed all sqlite3_stmt and sqlite3_backup objects and has been
-  ** passed to sqlite3_close (meaning that it is a zombie).  Therefore,
-  ** go ahead and free all resources.
-  */
-
-  /* If a transaction is open, roll it back. This also ensures that if
-  ** any database schemas have been modified by an uncommitted transaction
-  ** they are reset. And that the required b-tree mutex is held to make
-  ** the pager rollback and schema reset an atomic operation. */
-  sqlite3RollbackAll(db, SQLITE_OK);
-
-  /* Free any outstanding Savepoint structures. */
-  sqlite3CloseSavepoints(db);
-
-  /* Close all database connections */
-  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;
-      }
-    }
-  }
-  /* Clear the TEMP schema separately and last */
-  if( db->aDb[1].pSchema ){
-    sqlite3SchemaClear(db->aDb[1].pSchema);
-  }
-  sqlite3VtabUnlockList(db);
-
-  /* Free up the array of auxiliary databases */
-  sqlite3CollapseDatabaseArray(db);
-  assert( db->nDb<=2 );
-  assert( db->aDb==db->aDbStatic );
-
-  /* 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);
-
-  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 ){
-        functionDestroy(db, 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);
-    }
-    sqlite3VtabEponymousTableClear(db, pMod);
-    sqlite3DbFree(db, pMod);
-  }
-  sqlite3HashClear(&db->aModule);
-#endif
-
-  sqlite3Error(db, SQLITE_OK); /* Deallocates any cached error strings. */
-  sqlite3ValueFree(db->pErr);
-  sqlite3CloseExtensions(db);
-#if SQLITE_USER_AUTHENTICATION
-  sqlite3_free(db->auth.zAuthUser);
-  sqlite3_free(db->auth.zAuthPW);
-#endif
-
-  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);
-}
-
-/*
-** Rollback all database files.  If tripCode is not SQLITE_OK, then
-** any write cursors are invalidated ("tripped" - as in "tripping a circuit
-** breaker") and made to return tripCode if there are any further
-** attempts to use that cursor.  Read cursors remain open and valid
-** but are "saved" in case the table pages are moved around.
-*/
-void sqlite3RollbackAll(sqlite3 *db, int tripCode){
-  int i;
-  int inTrans = 0;
-  int schemaChange;
-  assert( sqlite3_mutex_held(db->mutex) );
-  sqlite3BeginBenignMalloc();
-
-  /* Obtain all b-tree mutexes before making any calls to BtreeRollback(). 
-  ** This is important in case the transaction being rolled back has
-  ** modified the database schema. If the b-tree mutexes are not taken
-  ** here, then another shared-cache connection might sneak in between
-  ** the database rollback and schema reset, which can cause false
-  ** corruption reports in some cases.  */
-  sqlite3BtreeEnterAll(db);
-  schemaChange = (db->flags & SQLITE_InternChanges)!=0 && db->init.busy==0;
-
-  for(i=0; i<db->nDb; i++){
-    Btree *p = db->aDb[i].pBt;
-    if( p ){
-      if( sqlite3BtreeIsInTrans(p) ){
-        inTrans = 1;
-      }
-      sqlite3BtreeRollback(p, tripCode, !schemaChange);
-    }
-  }
-  sqlite3VtabRollback(db);
-  sqlite3EndBenignMalloc();
-
-  if( (db->flags&SQLITE_InternChanges)!=0 && db->init.busy==0 ){
-    sqlite3ExpirePreparedStatements(db);
-    sqlite3ResetAllSchemasOfConnection(db);
-  }
-  sqlite3BtreeLeaveAll(db);
-
-  /* Any deferred constraint violations have now been resolved. */
-  db->nDeferredCons = 0;
-  db->nDeferredImmCons = 0;
-  db->flags &= ~SQLITE_DeferFKs;
-
-  /* If one has been configured, invoke the rollback-hook callback */
-  if( db->xRollbackCallback && (inTrans || !db->autoCommit) ){
-    db->xRollbackCallback(db->pRollbackArg);
-  }
-}
-
-/*
-** Return a static string containing the name corresponding to the error code
-** specified in the argument.
-*/
-#if defined(SQLITE_NEED_ERR_NAME)
-const char *sqlite3ErrName(int rc){
-  const char *zName = 0;
-  int i, origRc = rc;
-  for(i=0; i<2 && zName==0; i++, rc &= 0xff){
-    switch( rc ){
-      case SQLITE_OK:                 zName = "SQLITE_OK";                break;
-      case SQLITE_ERROR:              zName = "SQLITE_ERROR";             break;
-      case SQLITE_INTERNAL:           zName = "SQLITE_INTERNAL";          break;
-      case SQLITE_PERM:               zName = "SQLITE_PERM";              break;
-      case SQLITE_ABORT:              zName = "SQLITE_ABORT";             break;
-      case SQLITE_ABORT_ROLLBACK:     zName = "SQLITE_ABORT_ROLLBACK";    break;
-      case SQLITE_BUSY:               zName = "SQLITE_BUSY";              break;
-      case SQLITE_BUSY_RECOVERY:      zName = "SQLITE_BUSY_RECOVERY";     break;
-      case SQLITE_BUSY_SNAPSHOT:      zName = "SQLITE_BUSY_SNAPSHOT";     break;
-      case SQLITE_LOCKED:             zName = "SQLITE_LOCKED";            break;
-      case SQLITE_LOCKED_SHAREDCACHE: zName = "SQLITE_LOCKED_SHAREDCACHE";break;
-      case SQLITE_NOMEM:              zName = "SQLITE_NOMEM";             break;
-      case SQLITE_READONLY:           zName = "SQLITE_READONLY";          break;
-      case SQLITE_READONLY_RECOVERY:  zName = "SQLITE_READONLY_RECOVERY"; break;
-      case SQLITE_READONLY_CANTLOCK:  zName = "SQLITE_READONLY_CANTLOCK"; break;
-      case SQLITE_READONLY_ROLLBACK:  zName = "SQLITE_READONLY_ROLLBACK"; break;
-      case SQLITE_READONLY_DBMOVED:   zName = "SQLITE_READONLY_DBMOVED";  break;
-      case SQLITE_INTERRUPT:          zName = "SQLITE_INTERRUPT";         break;
-      case SQLITE_IOERR:              zName = "SQLITE_IOERR";             break;
-      case SQLITE_IOERR_READ:         zName = "SQLITE_IOERR_READ";        break;
-      case SQLITE_IOERR_SHORT_READ:   zName = "SQLITE_IOERR_SHORT_READ";  break;
-      case SQLITE_IOERR_WRITE:        zName = "SQLITE_IOERR_WRITE";       break;
-      case SQLITE_IOERR_FSYNC:        zName = "SQLITE_IOERR_FSYNC";       break;
-      case SQLITE_IOERR_DIR_FSYNC:    zName = "SQLITE_IOERR_DIR_FSYNC";   break;
-      case SQLITE_IOERR_TRUNCATE:     zName = "SQLITE_IOERR_TRUNCATE";    break;
-      case SQLITE_IOERR_FSTAT:        zName = "SQLITE_IOERR_FSTAT";       break;
-      case SQLITE_IOERR_UNLOCK:       zName = "SQLITE_IOERR_UNLOCK";      break;
-      case SQLITE_IOERR_RDLOCK:       zName = "SQLITE_IOERR_RDLOCK";      break;
-      case SQLITE_IOERR_DELETE:       zName = "SQLITE_IOERR_DELETE";      break;
-      case SQLITE_IOERR_NOMEM:        zName = "SQLITE_IOERR_NOMEM";       break;
-      case SQLITE_IOERR_ACCESS:       zName = "SQLITE_IOERR_ACCESS";      break;
-      case SQLITE_IOERR_CHECKRESERVEDLOCK:
-                                zName = "SQLITE_IOERR_CHECKRESERVEDLOCK"; break;
-      case SQLITE_IOERR_LOCK:         zName = "SQLITE_IOERR_LOCK";        break;
-      case SQLITE_IOERR_CLOSE:        zName = "SQLITE_IOERR_CLOSE";       break;
-      case SQLITE_IOERR_DIR_CLOSE:    zName = "SQLITE_IOERR_DIR_CLOSE";   break;
-      case SQLITE_IOERR_SHMOPEN:      zName = "SQLITE_IOERR_SHMOPEN";     break;
-      case SQLITE_IOERR_SHMSIZE:      zName = "SQLITE_IOERR_SHMSIZE";     break;
-      case SQLITE_IOERR_SHMLOCK:      zName = "SQLITE_IOERR_SHMLOCK";     break;
-      case SQLITE_IOERR_SHMMAP:       zName = "SQLITE_IOERR_SHMMAP";      break;
-      case SQLITE_IOERR_SEEK:         zName = "SQLITE_IOERR_SEEK";        break;
-      case SQLITE_IOERR_DELETE_NOENT: zName = "SQLITE_IOERR_DELETE_NOENT";break;
-      case SQLITE_IOERR_MMAP:         zName = "SQLITE_IOERR_MMAP";        break;
-      case SQLITE_IOERR_GETTEMPPATH:  zName = "SQLITE_IOERR_GETTEMPPATH"; break;
-      case SQLITE_IOERR_CONVPATH:     zName = "SQLITE_IOERR_CONVPATH";    break;
-      case SQLITE_CORRUPT:            zName = "SQLITE_CORRUPT";           break;
-      case SQLITE_CORRUPT_VTAB:       zName = "SQLITE_CORRUPT_VTAB";      break;
-      case SQLITE_NOTFOUND:           zName = "SQLITE_NOTFOUND";          break;
-      case SQLITE_FULL:               zName = "SQLITE_FULL";              break;
-      case SQLITE_CANTOPEN:           zName = "SQLITE_CANTOPEN";          break;
-      case SQLITE_CANTOPEN_NOTEMPDIR: zName = "SQLITE_CANTOPEN_NOTEMPDIR";break;
-      case SQLITE_CANTOPEN_ISDIR:     zName = "SQLITE_CANTOPEN_ISDIR";    break;
-      case SQLITE_CANTOPEN_FULLPATH:  zName = "SQLITE_CANTOPEN_FULLPATH"; break;
-      case SQLITE_CANTOPEN_CONVPATH:  zName = "SQLITE_CANTOPEN_CONVPATH"; break;
-      case SQLITE_PROTOCOL:           zName = "SQLITE_PROTOCOL";          break;
-      case SQLITE_EMPTY:              zName = "SQLITE_EMPTY";             break;
-      case SQLITE_SCHEMA:             zName = "SQLITE_SCHEMA";            break;
-      case SQLITE_TOOBIG:             zName = "SQLITE_TOOBIG";            break;
-      case SQLITE_CONSTRAINT:         zName = "SQLITE_CONSTRAINT";        break;
-      case SQLITE_CONSTRAINT_UNIQUE:  zName = "SQLITE_CONSTRAINT_UNIQUE"; break;
-      case SQLITE_CONSTRAINT_TRIGGER: zName = "SQLITE_CONSTRAINT_TRIGGER";break;
-      case SQLITE_CONSTRAINT_FOREIGNKEY:
-                                zName = "SQLITE_CONSTRAINT_FOREIGNKEY";   break;
-      case SQLITE_CONSTRAINT_CHECK:   zName = "SQLITE_CONSTRAINT_CHECK";  break;
-      case SQLITE_CONSTRAINT_PRIMARYKEY:
-                                zName = "SQLITE_CONSTRAINT_PRIMARYKEY";   break;
-      case SQLITE_CONSTRAINT_NOTNULL: zName = "SQLITE_CONSTRAINT_NOTNULL";break;
-      case SQLITE_CONSTRAINT_COMMITHOOK:
-                                zName = "SQLITE_CONSTRAINT_COMMITHOOK";   break;
-      case SQLITE_CONSTRAINT_VTAB:    zName = "SQLITE_CONSTRAINT_VTAB";   break;
-      case SQLITE_CONSTRAINT_FUNCTION:
-                                zName = "SQLITE_CONSTRAINT_FUNCTION";     break;
-      case SQLITE_CONSTRAINT_ROWID:   zName = "SQLITE_CONSTRAINT_ROWID";  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_NOTADB:             zName = "SQLITE_NOTADB";            break;
-      case SQLITE_ROW:                zName = "SQLITE_ROW";               break;
-      case SQLITE_NOTICE:             zName = "SQLITE_NOTICE";            break;
-      case SQLITE_NOTICE_RECOVER_WAL: zName = "SQLITE_NOTICE_RECOVER_WAL";break;
-      case SQLITE_NOTICE_RECOVER_ROLLBACK:
-                                zName = "SQLITE_NOTICE_RECOVER_ROLLBACK"; break;
-      case SQLITE_WARNING:            zName = "SQLITE_WARNING";           break;
-      case SQLITE_WARNING_AUTOINDEX:  zName = "SQLITE_WARNING_AUTOINDEX"; break;
-      case SQLITE_DONE:               zName = "SQLITE_DONE";              break;
-    }
-  }
-  if( zName==0 ){
-    static char zBuf[50];
-    sqlite3_snprintf(sizeof(zBuf), zBuf, "SQLITE_UNKNOWN(%d)", origRc);
-    zName = zBuf;
-  }
-  return zName;
-}
-#endif
-
-/*
-** 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    */ "unknown operation",
-    /* SQLITE_FULL        */ "database or disk is full",
-    /* SQLITE_CANTOPEN    */ "unable to open database file",
-    /* SQLITE_PROTOCOL    */ "locking protocol",
-    /* 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",
-  };
-  const char *zErr = "unknown error";
-  switch( rc ){
-    case SQLITE_ABORT_ROLLBACK: {
-      zErr = "abort due to ROLLBACK";
-      break;
-    }
-    default: {
-      rc &= 0xff;
-      if( ALWAYS(rc>=0) && rc<ArraySize(aMsg) && aMsg[rc]!=0 ){
-        zErr = aMsg[rc];
-      }
-      break;
-    }
-  }
-  return zErr;
-}
-
-/*
-** 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 || 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 ArraySize(delays)
-  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
-){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  db->busyHandler.xFunc = xBusy;
-  db->busyHandler.pArg = pArg;
-  db->busyHandler.nBusy = 0;
-  db->busyTimeout = 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
-){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return;
-  }
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  if( nOps>0 ){
-    db->xProgress = xProgress;
-    db->nProgressOps = (unsigned)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){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
-#endif
-  if( ms>0 ){
-    sqlite3_busy_handler(db, sqliteDefaultBusyCallback, (void*)db);
-    db->busyTimeout = ms;
-  }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){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return;
-  }
-#endif
-  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*),
-  FuncDestructor *pDestructor
-){
-  FuncDef *p;
-  int nName;
-  int extraFlags;
-
-  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_BKPT;
-  }
-
-  assert( SQLITE_FUNC_CONSTANT==SQLITE_DETERMINISTIC );
-  extraFlags = enc &  SQLITE_DETERMINISTIC;
-  enc &= (SQLITE_FUNC_ENCMASK|SQLITE_ANY);
-  
-#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|extraFlags,
-         pUserData, xFunc, xStep, xFinal, pDestructor);
-    if( rc==SQLITE_OK ){
-      rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF16LE|extraFlags,
-          pUserData, xFunc, xStep, xFinal, pDestructor);
-    }
-    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->funcFlags & SQLITE_FUNC_ENCMASK)==enc && p->nArg==nArg ){
-    if( db->nVdbeActive ){
-      sqlite3ErrorWithMsg(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;
-  }
-
-  /* If an older version of the function with a configured destructor is
-  ** being replaced invoke the destructor function here. */
-  functionDestroy(db, p);
-
-  if( pDestructor ){
-    pDestructor->nRef++;
-  }
-  p->pDestructor = pDestructor;
-  p->funcFlags = (p->funcFlags & SQLITE_FUNC_ENCMASK) | extraFlags;
-  testcase( p->funcFlags & SQLITE_DETERMINISTIC );
-  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 *zFunc,
-  int nArg,
-  int enc,
-  void *p,
-  void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
-  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
-  void (*xFinal)(sqlite3_context*)
-){
-  return sqlite3_create_function_v2(db, zFunc, nArg, enc, p, xFunc, xStep,
-                                    xFinal, 0);
-}
-
-int sqlite3_create_function_v2(
-  sqlite3 *db,
-  const char *zFunc,
-  int nArg,
-  int enc,
-  void *p,
-  void (*xFunc)(sqlite3_context*,int,sqlite3_value **),
-  void (*xStep)(sqlite3_context*,int,sqlite3_value **),
-  void (*xFinal)(sqlite3_context*),
-  void (*xDestroy)(void *)
-){
-  int rc = SQLITE_ERROR;
-  FuncDestructor *pArg = 0;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    return SQLITE_MISUSE_BKPT;
-  }
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  if( xDestroy ){
-    pArg = (FuncDestructor *)sqlite3DbMallocZero(db, sizeof(FuncDestructor));
-    if( !pArg ){
-      xDestroy(p);
-      goto out;
-    }
-    pArg->xDestroy = xDestroy;
-    pArg->pUserData = p;
-  }
-  rc = sqlite3CreateFunc(db, zFunc, nArg, enc, p, xFunc, xStep, xFinal, pArg);
-  if( pArg && pArg->nRef==0 ){
-    assert( rc!=SQLITE_OK );
-    xDestroy(p);
-    sqlite3DbFree(db, pArg);
-  }
-
- out:
-  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;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) || zFunctionName==0 ) return SQLITE_MISUSE_BKPT;
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  assert( !db->mallocFailed );
-  zFunc8 = sqlite3Utf16to8(db, zFunctionName, -1, SQLITE_UTF16NATIVE);
-  rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xFunc, xStep, xFinal,0);
-  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 = SQLITE_OK;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) || zName==0 || nArg<-2 ){
-    return SQLITE_MISUSE_BKPT;
-  }
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  if( sqlite3FindFunction(db, zName, nName, nArg, SQLITE_UTF8, 0)==0 ){
-    rc = sqlite3CreateFunc(db, zName, nArg, SQLITE_UTF8,
-                           0, sqlite3InvalidFunction, 0, 0, 0);
-  }
-  rc = sqlite3ApiExit(db, rc);
-  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;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  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;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  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 */
-
-/*
-** Register a function to be invoked when a transaction commits.
-** 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;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  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;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  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;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  pRet = db->pRollbackArg;
-  db->xRollbackCallback = xCallback;
-  db->pRollbackArg = pArg;
-  sqlite3_mutex_leave(db->mutex);
-  return pRet;
-}
-
-#ifndef SQLITE_OMIT_WAL
-/*
-** The sqlite3_wal_hook() callback registered by sqlite3_wal_autocheckpoint().
-** Invoke sqlite3_wal_checkpoint if the number of frames in the log file
-** is greater than sqlite3.pWalArg cast to an integer (the value configured by
-** wal_autocheckpoint()).
-*/ 
-int sqlite3WalDefaultHook(
-  void *pClientData,     /* Argument */
-  sqlite3 *db,           /* Connection */
-  const char *zDb,       /* Database */
-  int nFrame             /* Size of WAL */
-){
-  if( nFrame>=SQLITE_PTR_TO_INT(pClientData) ){
-    sqlite3BeginBenignMalloc();
-    sqlite3_wal_checkpoint(db, zDb);
-    sqlite3EndBenignMalloc();
-  }
-  return SQLITE_OK;
-}
-#endif /* SQLITE_OMIT_WAL */
-
-/*
-** Configure an sqlite3_wal_hook() callback to automatically checkpoint
-** a database after committing a transaction if there are nFrame or
-** more frames in the log file. Passing zero or a negative value as the
-** nFrame parameter disables automatic checkpoints entirely.
-**
-** The callback registered by this function replaces any existing callback
-** registered using sqlite3_wal_hook(). Likewise, registering a callback
-** using sqlite3_wal_hook() disables the automatic checkpoint mechanism
-** configured by this function.
-*/
-int sqlite3_wal_autocheckpoint(sqlite3 *db, int nFrame){
-#ifdef SQLITE_OMIT_WAL
-  UNUSED_PARAMETER(db);
-  UNUSED_PARAMETER(nFrame);
-#else
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
-#endif
-  if( nFrame>0 ){
-    sqlite3_wal_hook(db, sqlite3WalDefaultHook, SQLITE_INT_TO_PTR(nFrame));
-  }else{
-    sqlite3_wal_hook(db, 0, 0);
-  }
-#endif
-  return SQLITE_OK;
-}
-
-/*
-** Register a callback to be invoked each time a transaction is written
-** into the write-ahead-log by this database connection.
-*/
-void *sqlite3_wal_hook(
-  sqlite3 *db,                    /* Attach the hook to this db handle */
-  int(*xCallback)(void *, sqlite3*, const char*, int),
-  void *pArg                      /* First argument passed to xCallback() */
-){
-#ifndef SQLITE_OMIT_WAL
-  void *pRet;
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  pRet = db->pWalArg;
-  db->xWalCallback = xCallback;
-  db->pWalArg = pArg;
-  sqlite3_mutex_leave(db->mutex);
-  return pRet;
-#else
-  return 0;
-#endif
-}
-
-/*
-** Checkpoint database zDb.
-*/
-int sqlite3_wal_checkpoint_v2(
-  sqlite3 *db,                    /* Database handle */
-  const char *zDb,                /* Name of attached database (or NULL) */
-  int eMode,                      /* SQLITE_CHECKPOINT_* value */
-  int *pnLog,                     /* OUT: Size of WAL log in frames */
-  int *pnCkpt                     /* OUT: Total number of frames checkpointed */
-){
-#ifdef SQLITE_OMIT_WAL
-  return SQLITE_OK;
-#else
-  int rc;                         /* Return code */
-  int iDb = SQLITE_MAX_ATTACHED;  /* sqlite3.aDb[] index of db to checkpoint */
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
-#endif
-
-  /* Initialize the output variables to -1 in case an error occurs. */
-  if( pnLog ) *pnLog = -1;
-  if( pnCkpt ) *pnCkpt = -1;
-
-  assert( SQLITE_CHECKPOINT_PASSIVE==0 );
-  assert( SQLITE_CHECKPOINT_FULL==1 );
-  assert( SQLITE_CHECKPOINT_RESTART==2 );
-  assert( SQLITE_CHECKPOINT_TRUNCATE==3 );
-  if( eMode<SQLITE_CHECKPOINT_PASSIVE || eMode>SQLITE_CHECKPOINT_TRUNCATE ){
-    /* EVIDENCE-OF: R-03996-12088 The M parameter must be a valid checkpoint
-    ** mode: */
-    return SQLITE_MISUSE;
-  }
-
-  sqlite3_mutex_enter(db->mutex);
-  if( zDb && zDb[0] ){
-    iDb = sqlite3FindDbName(db, zDb);
-  }
-  if( iDb<0 ){
-    rc = SQLITE_ERROR;
-    sqlite3ErrorWithMsg(db, SQLITE_ERROR, "unknown database: %s", zDb);
-  }else{
-    db->busyHandler.nBusy = 0;
-    rc = sqlite3Checkpoint(db, iDb, eMode, pnLog, pnCkpt);
-    sqlite3Error(db, rc);
-  }
-  rc = sqlite3ApiExit(db, rc);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-#endif
-}
-
-
-/*
-** Checkpoint database zDb. If zDb is NULL, or if the buffer zDb points
-** to contains a zero-length string, all attached databases are 
-** checkpointed.
-*/
-int sqlite3_wal_checkpoint(sqlite3 *db, const char *zDb){
-  /* EVIDENCE-OF: R-41613-20553 The sqlite3_wal_checkpoint(D,X) is equivalent to
-  ** sqlite3_wal_checkpoint_v2(D,X,SQLITE_CHECKPOINT_PASSIVE,0,0). */
-  return sqlite3_wal_checkpoint_v2(db,zDb,SQLITE_CHECKPOINT_PASSIVE,0,0);
-}
-
-#ifndef SQLITE_OMIT_WAL
-/*
-** Run a checkpoint on database iDb. This is a no-op if database iDb is
-** not currently open in WAL mode.
-**
-** If a transaction is open on the database being checkpointed, this 
-** function returns SQLITE_LOCKED and a checkpoint is not attempted. If 
-** an error occurs while running the checkpoint, an SQLite error code is 
-** returned (i.e. SQLITE_IOERR). Otherwise, SQLITE_OK.
-**
-** The mutex on database handle db should be held by the caller. The mutex
-** associated with the specific b-tree being checkpointed is taken by
-** this function while the checkpoint is running.
-**
-** If iDb is passed SQLITE_MAX_ATTACHED, then all attached databases are
-** checkpointed. If an error is encountered it is returned immediately -
-** no attempt is made to checkpoint any remaining databases.
-**
-** Parameter eMode is one of SQLITE_CHECKPOINT_PASSIVE, FULL or RESTART.
-*/
-int sqlite3Checkpoint(sqlite3 *db, int iDb, int eMode, int *pnLog, int *pnCkpt){
-  int rc = SQLITE_OK;             /* Return code */
-  int i;                          /* Used to iterate through attached dbs */
-  int bBusy = 0;                  /* True if SQLITE_BUSY has been encountered */
-
-  assert( sqlite3_mutex_held(db->mutex) );
-  assert( !pnLog || *pnLog==-1 );
-  assert( !pnCkpt || *pnCkpt==-1 );
-
-  for(i=0; i<db->nDb && rc==SQLITE_OK; i++){
-    if( i==iDb || iDb==SQLITE_MAX_ATTACHED ){
-      rc = sqlite3BtreeCheckpoint(db->aDb[i].pBt, eMode, pnLog, pnCkpt);
-      pnLog = 0;
-      pnCkpt = 0;
-      if( rc==SQLITE_BUSY ){
-        bBusy = 1;
-        rc = SQLITE_OK;
-      }
-    }
-  }
-
-  return (rc==SQLITE_OK && bBusy) ? SQLITE_BUSY : rc;
-}
-#endif /* SQLITE_OMIT_WAL */
-
-/*
-** 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
-  UNUSED_PARAMETER(db);
-  return 1;
-#endif
-#if SQLITE_TEMP_STORE<1 || SQLITE_TEMP_STORE>3
-  UNUSED_PARAMETER(db);
-  return 0;
-#endif
-}
-
-/*
-** 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_BKPT);
-  }
-  sqlite3_mutex_enter(db->mutex);
-  if( db->mallocFailed ){
-    z = sqlite3ErrStr(SQLITE_NOMEM);
-  }else{
-    testcase( db->pErr==0 );
-    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 ){
-      sqlite3ErrorWithMsg(db, db->errCode, sqlite3ErrStr(db->errCode));
-      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_BKPT;
-  }
-  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_BKPT;
-  }
-  if( !db || db->mallocFailed ){
-    return SQLITE_NOMEM;
-  }
-  return db->errCode;
-}
-
-/*
-** Return a string that describes the kind of error specified in the
-** argument.  For now, this simply calls the internal sqlite3ErrStr()
-** function.
-*/
-const char *sqlite3_errstr(int rc){
-  return sqlite3ErrStr(rc);
-}
-
-/*
-** 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,
-  void* pCtx,
-  int(*xCompare)(void*,int,const void*,int,const void*),
-  void(*xDel)(void*)
-){
-  CollSeq *pColl;
-  int enc2;
-  
-  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_BKPT;
-  }
-
-  /* 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->nVdbeActive ){
-      sqlite3ErrorWithMsg(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);
-      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==0 ) return SQLITE_NOMEM;
-  pColl->xCmp = xCompare;
-  pColl->pUser = pCtx;
-  pColl->xDel = xDel;
-  pColl->enc = (u8)(enc2 | (enc & SQLITE_UTF16_ALIGNED));
-  sqlite3Error(db, SQLITE_OK);
-  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,      /* IMP: R-38091-32352 */
-  SQLITE_MAX_TRIGGER_DEPTH,
-  SQLITE_MAX_WORKER_THREADS,
-};
-
-/*
-** 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>125
-# error SQLITE_MAX_ATTACHED must be between 0 and 125
-#endif
-#if SQLITE_MAX_LIKE_PATTERN_LENGTH<1
-# error SQLITE_MAX_LIKE_PATTERN_LENGTH 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
-#if SQLITE_MAX_WORKER_THREADS<0 || SQLITE_MAX_WORKER_THREADS>50
-# error SQLITE_MAX_WORKER_THREADS must be between 0 and 50
-#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;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return -1;
-  }
-#endif
-
-  /* EVIDENCE-OF: R-30189-54097 For each limit category SQLITE_LIMIT_NAME
-  ** there is a hard upper bound set at compile-time by a C preprocessor
-  ** macro called SQLITE_MAX_NAME. (The "_LIMIT_" in the name is changed to
-  ** "_MAX_".)
-  */
-  assert( aHardLimit[SQLITE_LIMIT_LENGTH]==SQLITE_MAX_LENGTH );
-  assert( aHardLimit[SQLITE_LIMIT_SQL_LENGTH]==SQLITE_MAX_SQL_LENGTH );
-  assert( aHardLimit[SQLITE_LIMIT_COLUMN]==SQLITE_MAX_COLUMN );
-  assert( aHardLimit[SQLITE_LIMIT_EXPR_DEPTH]==SQLITE_MAX_EXPR_DEPTH );
-  assert( aHardLimit[SQLITE_LIMIT_COMPOUND_SELECT]==SQLITE_MAX_COMPOUND_SELECT);
-  assert( aHardLimit[SQLITE_LIMIT_VDBE_OP]==SQLITE_MAX_VDBE_OP );
-  assert( aHardLimit[SQLITE_LIMIT_FUNCTION_ARG]==SQLITE_MAX_FUNCTION_ARG );
-  assert( aHardLimit[SQLITE_LIMIT_ATTACHED]==SQLITE_MAX_ATTACHED );
-  assert( aHardLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]==
-                                               SQLITE_MAX_LIKE_PATTERN_LENGTH );
-  assert( aHardLimit[SQLITE_LIMIT_VARIABLE_NUMBER]==SQLITE_MAX_VARIABLE_NUMBER);
-  assert( aHardLimit[SQLITE_LIMIT_TRIGGER_DEPTH]==SQLITE_MAX_TRIGGER_DEPTH );
-  assert( aHardLimit[SQLITE_LIMIT_WORKER_THREADS]==SQLITE_MAX_WORKER_THREADS );
-  assert( SQLITE_LIMIT_WORKER_THREADS==(SQLITE_N_LIMIT-1) );
-
-
-  if( limitId<0 || limitId>=SQLITE_N_LIMIT ){
-    return -1;
-  }
-  oldLimit = db->aLimit[limitId];
-  if( newLimit>=0 ){                   /* IMP: R-52476-28732 */
-    if( newLimit>aHardLimit[limitId] ){
-      newLimit = aHardLimit[limitId];  /* IMP: R-51463-25634 */
-    }
-    db->aLimit[limitId] = newLimit;
-  }
-  return oldLimit;                     /* IMP: R-53341-35419 */
-}
-
-/*
-** This function is used to parse both URIs and non-URI filenames passed by the
-** user to API functions sqlite3_open() or sqlite3_open_v2(), and for database
-** URIs specified as part of ATTACH statements.
-**
-** The first argument to this function is the name of the VFS to use (or
-** a NULL to signify the default VFS) if the URI does not contain a "vfs=xxx"
-** query parameter. The second argument contains the URI (or non-URI filename)
-** itself. When this function is called the *pFlags variable should contain
-** the default flags to open the database handle with. The value stored in
-** *pFlags may be updated before returning if the URI filename contains 
-** "cache=xxx" or "mode=xxx" query parameters.
-**
-** If successful, SQLITE_OK is returned. In this case *ppVfs is set to point to
-** the VFS that should be used to open the database file. *pzFile is set to
-** point to a buffer containing the name of the file to open. It is the 
-** responsibility of the caller to eventually call sqlite3_free() to release
-** this buffer.
-**
-** If an error occurs, then an SQLite error code is returned and *pzErrMsg
-** may be set to point to a buffer containing an English language error 
-** message. It is the responsibility of the caller to eventually release
-** this buffer by calling sqlite3_free().
-*/
-int sqlite3ParseUri(
-  const char *zDefaultVfs,        /* VFS to use if no "vfs=xxx" query option */
-  const char *zUri,               /* Nul-terminated URI to parse */
-  unsigned int *pFlags,           /* IN/OUT: SQLITE_OPEN_XXX flags */
-  sqlite3_vfs **ppVfs,            /* OUT: VFS to use */ 
-  char **pzFile,                  /* OUT: Filename component of URI */
-  char **pzErrMsg                 /* OUT: Error message (if rc!=SQLITE_OK) */
-){
-  int rc = SQLITE_OK;
-  unsigned int flags = *pFlags;
-  const char *zVfs = zDefaultVfs;
-  char *zFile;
-  char c;
-  int nUri = sqlite3Strlen30(zUri);
-
-  assert( *pzErrMsg==0 );
-
-  if( ((flags & SQLITE_OPEN_URI)             /* IMP: R-48725-32206 */
-            || sqlite3GlobalConfig.bOpenUri) /* IMP: R-51689-46548 */
-   && nUri>=5 && memcmp(zUri, "file:", 5)==0 /* IMP: R-57884-37496 */
-  ){
-    char *zOpt;
-    int eState;                   /* Parser state when parsing URI */
-    int iIn;                      /* Input character index */
-    int iOut = 0;                 /* Output character index */
-    u64 nByte = nUri+2;           /* Bytes of space to allocate */
-
-    /* Make sure the SQLITE_OPEN_URI flag is set to indicate to the VFS xOpen 
-    ** method that there may be extra parameters following the file-name.  */
-    flags |= SQLITE_OPEN_URI;
-
-    for(iIn=0; iIn<nUri; iIn++) nByte += (zUri[iIn]=='&');
-    zFile = sqlite3_malloc64(nByte);
-    if( !zFile ) return SQLITE_NOMEM;
-
-    iIn = 5;
-#ifdef SQLITE_ALLOW_URI_AUTHORITY
-    if( strncmp(zUri+5, "///", 3)==0 ){
-      iIn = 7;
-      /* The following condition causes URIs with five leading / characters
-      ** like file://///host/path to be converted into UNCs like //host/path.
-      ** The correct URI for that UNC has only two or four leading / characters
-      ** file://host/path or file:////host/path.  But 5 leading slashes is a 
-      ** common error, we are told, so we handle it as a special case. */
-      if( strncmp(zUri+7, "///", 3)==0 ){ iIn++; }
-    }else if( strncmp(zUri+5, "//localhost/", 12)==0 ){
-      iIn = 16;
-    }
-#else
-    /* Discard the scheme and authority segments of the URI. */
-    if( zUri[5]=='/' && zUri[6]=='/' ){
-      iIn = 7;
-      while( zUri[iIn] && zUri[iIn]!='/' ) iIn++;
-      if( iIn!=7 && (iIn!=16 || memcmp("localhost", &zUri[7], 9)) ){
-        *pzErrMsg = sqlite3_mprintf("invalid uri authority: %.*s", 
-            iIn-7, &zUri[7]);
-        rc = SQLITE_ERROR;
-        goto parse_uri_out;
-      }
-    }
-#endif
-
-    /* Copy the filename and any query parameters into the zFile buffer. 
-    ** Decode %HH escape codes along the way. 
-    **
-    ** Within this loop, variable eState may be set to 0, 1 or 2, depending
-    ** on the parsing context. As follows:
-    **
-    **   0: Parsing file-name.
-    **   1: Parsing name section of a name=value query parameter.
-    **   2: Parsing value section of a name=value query parameter.
-    */
-    eState = 0;
-    while( (c = zUri[iIn])!=0 && c!='#' ){
-      iIn++;
-      if( c=='%' 
-       && sqlite3Isxdigit(zUri[iIn]) 
-       && sqlite3Isxdigit(zUri[iIn+1]) 
-      ){
-        int octet = (sqlite3HexToInt(zUri[iIn++]) << 4);
-        octet += sqlite3HexToInt(zUri[iIn++]);
-
-        assert( octet>=0 && octet<256 );
-        if( octet==0 ){
-          /* This branch is taken when "%00" appears within the URI. In this
-          ** case we ignore all text in the remainder of the path, name or
-          ** value currently being parsed. So ignore the current character
-          ** and skip to the next "?", "=" or "&", as appropriate. */
-          while( (c = zUri[iIn])!=0 && c!='#' 
-              && (eState!=0 || c!='?')
-              && (eState!=1 || (c!='=' && c!='&'))
-              && (eState!=2 || c!='&')
-          ){
-            iIn++;
-          }
-          continue;
-        }
-        c = octet;
-      }else if( eState==1 && (c=='&' || c=='=') ){
-        if( zFile[iOut-1]==0 ){
-          /* An empty option name. Ignore this option altogether. */
-          while( zUri[iIn] && zUri[iIn]!='#' && zUri[iIn-1]!='&' ) iIn++;
-          continue;
-        }
-        if( c=='&' ){
-          zFile[iOut++] = '\0';
-        }else{
-          eState = 2;
-        }
-        c = 0;
-      }else if( (eState==0 && c=='?') || (eState==2 && c=='&') ){
-        c = 0;
-        eState = 1;
-      }
-      zFile[iOut++] = c;
-    }
-    if( eState==1 ) zFile[iOut++] = '\0';
-    zFile[iOut++] = '\0';
-    zFile[iOut++] = '\0';
-
-    /* Check if there were any options specified that should be interpreted 
-    ** here. Options that are interpreted here include "vfs" and those that
-    ** correspond to flags that may be passed to the sqlite3_open_v2()
-    ** method. */
-    zOpt = &zFile[sqlite3Strlen30(zFile)+1];
-    while( zOpt[0] ){
-      int nOpt = sqlite3Strlen30(zOpt);
-      char *zVal = &zOpt[nOpt+1];
-      int nVal = sqlite3Strlen30(zVal);
-
-      if( nOpt==3 && memcmp("vfs", zOpt, 3)==0 ){
-        zVfs = zVal;
-      }else{
-        struct OpenMode {
-          const char *z;
-          int mode;
-        } *aMode = 0;
-        char *zModeType = 0;
-        int mask = 0;
-        int limit = 0;
-
-        if( nOpt==5 && memcmp("cache", zOpt, 5)==0 ){
-          static struct OpenMode aCacheMode[] = {
-            { "shared",  SQLITE_OPEN_SHAREDCACHE },
-            { "private", SQLITE_OPEN_PRIVATECACHE },
-            { 0, 0 }
-          };
-
-          mask = SQLITE_OPEN_SHAREDCACHE|SQLITE_OPEN_PRIVATECACHE;
-          aMode = aCacheMode;
-          limit = mask;
-          zModeType = "cache";
-        }
-        if( nOpt==4 && memcmp("mode", zOpt, 4)==0 ){
-          static struct OpenMode aOpenMode[] = {
-            { "ro",  SQLITE_OPEN_READONLY },
-            { "rw",  SQLITE_OPEN_READWRITE }, 
-            { "rwc", SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE },
-            { "memory", SQLITE_OPEN_MEMORY },
-            { 0, 0 }
-          };
-
-          mask = SQLITE_OPEN_READONLY | SQLITE_OPEN_READWRITE
-                   | SQLITE_OPEN_CREATE | SQLITE_OPEN_MEMORY;
-          aMode = aOpenMode;
-          limit = mask & flags;
-          zModeType = "access";
-        }
-
-        if( aMode ){
-          int i;
-          int mode = 0;
-          for(i=0; aMode[i].z; i++){
-            const char *z = aMode[i].z;
-            if( nVal==sqlite3Strlen30(z) && 0==memcmp(zVal, z, nVal) ){
-              mode = aMode[i].mode;
-              break;
-            }
-          }
-          if( mode==0 ){
-            *pzErrMsg = sqlite3_mprintf("no such %s mode: %s", zModeType, zVal);
-            rc = SQLITE_ERROR;
-            goto parse_uri_out;
-          }
-          if( (mode & ~SQLITE_OPEN_MEMORY)>limit ){
-            *pzErrMsg = sqlite3_mprintf("%s mode not allowed: %s",
-                                        zModeType, zVal);
-            rc = SQLITE_PERM;
-            goto parse_uri_out;
-          }
-          flags = (flags & ~mask) | mode;
-        }
-      }
-
-      zOpt = &zVal[nVal+1];
-    }
-
-  }else{
-    zFile = sqlite3_malloc64(nUri+2);
-    if( !zFile ) return SQLITE_NOMEM;
-    memcpy(zFile, zUri, nUri);
-    zFile[nUri] = '\0';
-    zFile[nUri+1] = '\0';
-    flags &= ~SQLITE_OPEN_URI;
-  }
-
-  *ppVfs = sqlite3_vfs_find(zVfs);
-  if( *ppVfs==0 ){
-    *pzErrMsg = sqlite3_mprintf("no such vfs: %s", zVfs);
-    rc = SQLITE_ERROR;
-  }
- parse_uri_out:
-  if( rc!=SQLITE_OK ){
-    sqlite3_free(zFile);
-    zFile = 0;
-  }
-  *pFlags = flags;
-  *pzFile = zFile;
-  return rc;
-}
-
-
-/*
-** 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 int flags,    /* Operational flags */
-  const char *zVfs       /* Name of the VFS to use */
-){
-  sqlite3 *db;                    /* Store allocated handle here */
-  int rc;                         /* Return code */
-  int isThreadsafe;               /* True for threadsafe connections */
-  char *zOpen = 0;                /* Filename argument to pass to BtreeOpen() */
-  char *zErrMsg = 0;              /* Error message from sqlite3ParseUri() */
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( ppDb==0 ) return SQLITE_MISUSE_BKPT;
-#endif
-  *ppDb = 0;
-#ifndef SQLITE_OMIT_AUTOINIT
-  rc = sqlite3_initialize();
-  if( rc ) return rc;
-#endif
-
-  /* Only allow sensible combinations of bits in the flags argument.  
-  ** Throw an error if any non-sense combination is used.  If we
-  ** do not block illegal combinations here, it could trigger
-  ** assert() statements in deeper layers.  Sensible combinations
-  ** are:
-  **
-  **  1:  SQLITE_OPEN_READONLY
-  **  2:  SQLITE_OPEN_READWRITE
-  **  6:  SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE
-  */
-  assert( SQLITE_OPEN_READONLY  == 0x01 );
-  assert( SQLITE_OPEN_READWRITE == 0x02 );
-  assert( SQLITE_OPEN_CREATE    == 0x04 );
-  testcase( (1<<(flags&7))==0x02 ); /* READONLY */
-  testcase( (1<<(flags&7))==0x04 ); /* READWRITE */
-  testcase( (1<<(flags&7))==0x40 ); /* READWRITE | CREATE */
-  if( ((1<<(flags&7)) & 0x46)==0 ){
-    return SQLITE_MISUSE_BKPT;  /* IMP: R-65497-44594 */
-  }
-
-  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, SQLITE_OPEN_CREATE, SQLITE_OPEN_SHAREDCACHE,
-  ** SQLITE_OPEN_PRIVATECACHE, and some reserved bits.  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 |
-               SQLITE_OPEN_WAL
-             );
-
-  /* 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->aLimit[SQLITE_LIMIT_WORKER_THREADS] = SQLITE_DEFAULT_WORKER_THREADS;
-  db->autoCommit = 1;
-  db->nextAutovac = -1;
-  db->szMmap = sqlite3GlobalConfig.szMmap;
-  db->nextPagesize = 0;
-  db->nMaxSorterMmap = 0x7FFFFFFF;
-  db->flags |= SQLITE_ShortColNames | SQLITE_EnableTrigger | SQLITE_CacheSpill
-#if !defined(SQLITE_DEFAULT_AUTOMATIC_INDEX) || SQLITE_DEFAULT_AUTOMATIC_INDEX
-                 | SQLITE_AutoIndex
-#endif
-#if SQLITE_DEFAULT_CKPTFULLFSYNC
-                 | SQLITE_CkptFullFSync
-#endif
-#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
-#if defined(SQLITE_DEFAULT_FOREIGN_KEYS) && SQLITE_DEFAULT_FOREIGN_KEYS
-                 | SQLITE_ForeignKeys
-#endif
-#if defined(SQLITE_REVERSE_UNORDERED_SELECTS)
-                 | SQLITE_ReverseOrder
-#endif
-#if defined(SQLITE_ENABLE_OVERSIZE_CELL_CHECK)
-                 | SQLITE_CellSizeCk
-#endif
-      ;
-  sqlite3HashInit(&db->aCollSeq);
-#ifndef SQLITE_OMIT_VIRTUALTABLE
-  sqlite3HashInit(&db->aModule);
-#endif
-
-  /* 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.
-  **
-  ** EVIDENCE-OF: R-52786-44878 SQLite defines three built-in collating
-  ** functions:
-  */
-  createCollation(db, sqlite3StrBINARY, SQLITE_UTF8, 0, binCollFunc, 0);
-  createCollation(db, sqlite3StrBINARY, SQLITE_UTF16BE, 0, binCollFunc, 0);
-  createCollation(db, sqlite3StrBINARY, SQLITE_UTF16LE, 0, binCollFunc, 0);
-  createCollation(db, "NOCASE", SQLITE_UTF8, 0, nocaseCollatingFunc, 0);
-  createCollation(db, "RTRIM", SQLITE_UTF8, (void*)1, binCollFunc, 0);
-  if( db->mallocFailed ){
-    goto opendb_out;
-  }
-  /* EVIDENCE-OF: R-08308-17224 The default collating function for all
-  ** strings is BINARY. 
-  */
-  db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, sqlite3StrBINARY, 0);
-  assert( db->pDfltColl!=0 );
-
-  /* Parse the filename/URI argument. */
-  db->openFlags = flags;
-  rc = sqlite3ParseUri(zVfs, zFilename, &flags, &db->pVfs, &zOpen, &zErrMsg);
-  if( rc!=SQLITE_OK ){
-    if( rc==SQLITE_NOMEM ) db->mallocFailed = 1;
-    sqlite3ErrorWithMsg(db, rc, zErrMsg ? "%s" : 0, zErrMsg);
-    sqlite3_free(zErrMsg);
-    goto opendb_out;
-  }
-
-  /* Open the backend database driver */
-  rc = sqlite3BtreeOpen(db->pVfs, zOpen, db, &db->aDb[0].pBt, 0,
-                        flags | SQLITE_OPEN_MAIN_DB);
-  if( rc!=SQLITE_OK ){
-    if( rc==SQLITE_IOERR_NOMEM ){
-      rc = SQLITE_NOMEM;
-    }
-    sqlite3Error(db, rc);
-    goto opendb_out;
-  }
-  sqlite3BtreeEnter(db->aDb[0].pBt);
-  db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt);
-  if( !db->mallocFailed ) ENC(db) = SCHEMA_ENC(db);
-  sqlite3BtreeLeave(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);
-  sqlite3RegisterBuiltinFunctions(db);
-
-  /* Load automatic extensions - extensions that have been registered
-  ** using the sqlite3_automatic_extension() API.
-  */
-  rc = sqlite3_errcode(db);
-  if( rc==SQLITE_OK ){
-    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 /* automatically defined by SQLITE_ENABLE_FTS4 */
-  if( !db->mallocFailed && rc==SQLITE_OK ){
-    rc = sqlite3Fts3Init(db);
-  }
-#endif
-
-#ifdef SQLITE_ENABLE_FTS5
-  if( !db->mallocFailed && rc==SQLITE_OK ){
-    rc = sqlite3Fts5Init(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
-
-#ifdef SQLITE_ENABLE_DBSTAT_VTAB
-  if( !db->mallocFailed && rc==SQLITE_OK){
-    rc = sqlite3DbstatRegister(db);
-  }
-#endif
-
-#ifdef SQLITE_ENABLE_JSON1
-  if( !db->mallocFailed && rc==SQLITE_OK){
-    rc = sqlite3Json1Init(db);
-  }
-#endif
-
-  /* -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
-
-  if( rc ) sqlite3Error(db, rc);
-
-  /* Enable the lookaside-malloc subsystem */
-  setupLookaside(db, 0, sqlite3GlobalConfig.szLookaside,
-                        sqlite3GlobalConfig.nLookaside);
-
-  sqlite3_wal_autocheckpoint(db, SQLITE_DEFAULT_WAL_AUTOCHECKPOINT);
-
-opendb_out:
-  if( db ){
-    assert( db->mutex!=0 || isThreadsafe==0
-           || sqlite3GlobalConfig.bFullMutex==0 );
-    sqlite3_mutex_leave(db->mutex);
-  }
-  rc = sqlite3_errcode(db);
-  assert( db!=0 || rc==SQLITE_NOMEM );
-  if( rc==SQLITE_NOMEM ){
-    sqlite3_close(db);
-    db = 0;
-  }else if( rc!=SQLITE_OK ){
-    db->magic = SQLITE_MAGIC_SICK;
-  }
-  *ppDb = db;
-#ifdef SQLITE_ENABLE_SQLLOG
-  if( sqlite3GlobalConfig.xSqllog ){
-    /* Opening a db handle. Fourth parameter is passed 0. */
-    void *pArg = sqlite3GlobalConfig.pSqllogArg;
-    sqlite3GlobalConfig.xSqllog(pArg, db, zFilename, 0);
-  }
-#endif
-#if defined(SQLITE_HAS_CODEC)
-  if( rc==SQLITE_OK ){
-    const char *zHexKey = sqlite3_uri_parameter(zOpen, "hexkey");
-    if( zHexKey && zHexKey[0] ){
-      u8 iByte;
-      int i;
-      char zKey[40];
-      for(i=0, iByte=0; i<sizeof(zKey)*2 && sqlite3Isxdigit(zHexKey[i]); i++){
-        iByte = (iByte<<4) + sqlite3HexToInt(zHexKey[i]);
-        if( (i&1)!=0 ) zKey[i/2] = iByte;
-      }
-      sqlite3_key_v2(db, 0, zKey, i/2);
-    }
-  }
-#endif
-  sqlite3_free(zOpen);
-  return rc & 0xff;
-}
-
-/*
-** 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, (unsigned int)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;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( ppDb==0 ) return SQLITE_MISUSE_BKPT;
-#endif
-  *ppDb = 0;
-#ifndef SQLITE_OMIT_AUTOINIT
-  rc = sqlite3_initialize();
-  if( rc ) return rc;
-#endif
-  if( zFilename==0 ) zFilename = "\000\000";
-  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) ){
-      SCHEMA_ENC(*ppDb) = ENC(*ppDb) = SQLITE_UTF16NATIVE;
-    }
-  }else{
-    rc = SQLITE_NOMEM;
-  }
-  sqlite3ValueFree(pVal);
-
-  return rc & 0xff;
-}
-#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*)
-){
-  return sqlite3_create_collation_v2(db, zName, enc, pCtx, xCompare, 0);
-}
-
-/*
-** 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;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) || zName==0 ) return SQLITE_MISUSE_BKPT;
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  assert( !db->mallocFailed );
-  rc = createCollation(db, zName, (u8)enc, 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;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) || zName==0 ) return SQLITE_MISUSE_BKPT;
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  assert( !db->mallocFailed );
-  zName8 = sqlite3Utf16to8(db, zName, -1, SQLITE_UTF16NATIVE);
-  if( zName8 ){
-    rc = createCollation(db, zName8, (u8)enc, 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*)
-){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
-#endif
-  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*)
-){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
-#endif
-  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_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
-
-/*
-** 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.
-*/
-int sqlite3_get_autocommit(sqlite3 *db){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  return db->autoCommit;
-}
-
-/*
-** The following routines are substitutes for constants SQLITE_CORRUPT,
-** SQLITE_MISUSE, SQLITE_CANTOPEN, SQLITE_IOERR and possibly other error
-** constants.  They serve two purposes:
-**
-**   1.  Serve as a convenient place to set a breakpoint in a debugger
-**       to detect when version error conditions occurs.
-**
-**   2.  Invoke sqlite3_log() to provide the source code location where
-**       a low-level error is first detected.
-*/
-int sqlite3CorruptError(int lineno){
-  testcase( sqlite3GlobalConfig.xLog!=0 );
-  sqlite3_log(SQLITE_CORRUPT,
-              "database corruption at line %d of [%.10s]",
-              lineno, 20+sqlite3_sourceid());
-  return SQLITE_CORRUPT;
-}
-int sqlite3MisuseError(int lineno){
-  testcase( sqlite3GlobalConfig.xLog!=0 );
-  sqlite3_log(SQLITE_MISUSE, 
-              "misuse at line %d of [%.10s]",
-              lineno, 20+sqlite3_sourceid());
-  return SQLITE_MISUSE;
-}
-int sqlite3CantopenError(int lineno){
-  testcase( sqlite3GlobalConfig.xLog!=0 );
-  sqlite3_log(SQLITE_CANTOPEN, 
-              "cannot open file at line %d of [%.10s]",
-              lineno, 20+sqlite3_sourceid());
-  return SQLITE_CANTOPEN;
-}
-
-
-#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.
-*/
-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 = 0;
-  char const *zDataType = 0;
-  char const *zCollSeq = 0;
-  int notnull = 0;
-  int primarykey = 0;
-  int autoinc = 0;
-
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) || zTableName==0 ){
-    return SQLITE_MISUSE_BKPT;
-  }
-#endif
-
-  /* Ensure the database schema has been loaded */
-  sqlite3_mutex_enter(db->mutex);
-  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( zColumnName==0 ){
-    /* Query for existance of table only */
-  }else{
-    for(iCol=0; iCol<pTab->nCol; iCol++){
-      pCol = &pTab->aCol[iCol];
-      if( 0==sqlite3StrICmp(pCol->zName, zColumnName) ){
-        break;
-      }
-    }
-    if( iCol==pTab->nCol ){
-      if( HasRowid(pTab) && sqlite3IsRowid(zColumnName) ){
-        iCol = pTab->iPKey;
-        pCol = iCol>=0 ? &pTab->aCol[iCol] : 0;
-      }else{
-        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->colFlags & COLFLAG_PRIMKEY)!=0;
-    autoinc = pTab->iPKey==iCol && (pTab->tabFlags & TF_Autoincrement)!=0;
-  }else{
-    zDataType = "INTEGER";
-    primarykey = 1;
-  }
-  if( !zCollSeq ){
-    zCollSeq = sqlite3StrBINARY;
-  }
-
-error_out:
-  sqlite3BtreeLeaveAll(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;
-  }
-  sqlite3ErrorWithMsg(db, rc, (zErrMsg?"%s":0), zErrMsg);
-  sqlite3DbFree(db, zErrMsg);
-  rc = sqlite3ApiExit(db, rc);
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-}
-
-/*
-** 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){
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
-#endif
-  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;
-  Btree *pBtree;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT;
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  pBtree = sqlite3DbNameToBtree(db, zDbName);
-  if( pBtree ){
-    Pager *pPager;
-    sqlite3_file *fd;
-    sqlite3BtreeEnter(pBtree);
-    pPager = sqlite3BtreePager(pBtree);
-    assert( pPager!=0 );
-    fd = sqlite3PagerFile(pPager);
-    assert( fd!=0 );
-    if( op==SQLITE_FCNTL_FILE_POINTER ){
-      *(sqlite3_file**)pArg = fd;
-      rc = SQLITE_OK;
-    }else if( op==SQLITE_FCNTL_VFS_POINTER ){
-      *(sqlite3_vfs**)pArg = sqlite3PagerVfs(pPager);
-      rc = SQLITE_OK;
-    }else if( op==SQLITE_FCNTL_JOURNAL_POINTER ){
-      *(sqlite3_file**)pArg = sqlite3PagerJrnlFile(pPager);
-      rc = SQLITE_OK;
-    }else if( fd->pMethods ){
-      rc = sqlite3OsFileControl(fd, op, pArg);
-    }else{
-      rc = SQLITE_NOTFOUND;
-    }
-    sqlite3BtreeLeave(pBtree);
-  }
-  sqlite3_mutex_leave(db->mutex);
-  return rc;
-}
-
-/*
-** Interface to the testing logic.
-*/
-int sqlite3_test_control(int op, ...){
-  int rc = 0;
-#ifdef SQLITE_OMIT_BUILTIN_TEST
-  UNUSED_PARAMETER(op);
-#else
-  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: {
-      sqlite3_randomness(0,0);
-      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(FAULT_INSTALL, xCallback)
-    **
-    ** Arrange to invoke xCallback() whenever sqlite3FaultSim() is called,
-    ** if xCallback is not NULL.
-    **
-    ** As a test of the fault simulator mechanism itself, sqlite3FaultSim(0)
-    ** is called immediately after installing the new callback and the return
-    ** value from sqlite3FaultSim(0) becomes the return from
-    ** sqlite3_test_control().
-    */
-    case SQLITE_TESTCTRL_FAULT_INSTALL: {
-      /* MSVC is picky about pulling func ptrs from va lists.
-      ** http://support.microsoft.com/kb/47961
-      ** sqlite3GlobalConfig.xTestCallback = va_arg(ap, int(*)(int));
-      */
-      typedef int(*TESTCALLBACKFUNC_t)(int);
-      sqlite3GlobalConfig.xTestCallback = va_arg(ap, TESTCALLBACKFUNC_t);
-      rc = sqlite3FaultSim(0);
-      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
-    ** deleterious behavior.
-    */
-    case SQLITE_TESTCTRL_PENDING_BYTE: {
-      rc = PENDING_BYTE;
-#ifndef SQLITE_OMIT_WSD
-      {
-        unsigned int newVal = va_arg(ap, unsigned int);
-        if( newVal ) sqlite3PendingByte = newVal;
-      }
-#endif
-      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_BYTEORDER);
-    **
-    ** The integer returned reveals the byte-order of the computer on which
-    ** SQLite is running:
-    **
-    **       1     big-endian,    determined at run-time
-    **      10     little-endian, determined at run-time
-    **  432101     big-endian,    determined at compile-time
-    **  123410     little-endian, determined at compile-time
-    */ 
-    case SQLITE_TESTCTRL_BYTEORDER: {
-      rc = SQLITE_BYTEORDER*100 + SQLITE_LITTLEENDIAN*10 + SQLITE_BIGENDIAN;
-      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;
-    }
-
-    /*  sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS, sqlite3 *db, int N)
-    **
-    ** Enable or disable various optimizations for testing purposes.  The 
-    ** argument N is a bitmask of optimizations to be disabled.  For normal
-    ** operation N should be 0.  The idea is that a test program (like the
-    ** SQL Logic Test or SLT test module) can run the same SQL multiple times
-    ** with various optimizations disabled to verify that the same answer
-    ** is obtained in every case.
-    */
-    case SQLITE_TESTCTRL_OPTIMIZATIONS: {
-      sqlite3 *db = va_arg(ap, sqlite3*);
-      db->dbOptFlags = (u16)(va_arg(ap, int) & 0xffff);
-      break;
-    }
-
-#ifdef SQLITE_N_KEYWORD
-    /* sqlite3_test_control(SQLITE_TESTCTRL_ISKEYWORD, const char *zWord)
-    **
-    ** If zWord is a keyword recognized by the parser, then return the
-    ** number of keywords.  Or if zWord is not a keyword, return 0.
-    ** 
-    ** This test feature is only available in the amalgamation since
-    ** the SQLITE_N_KEYWORD macro is not defined in this file if SQLite
-    ** is built using separate source files.
-    */
-    case SQLITE_TESTCTRL_ISKEYWORD: {
-      const char *zWord = va_arg(ap, const char*);
-      int n = sqlite3Strlen30(zWord);
-      rc = (sqlite3KeywordCode((u8*)zWord, n)!=TK_ID) ? SQLITE_N_KEYWORD : 0;
-      break;
-    }
-#endif 
-
-    /* sqlite3_test_control(SQLITE_TESTCTRL_SCRATCHMALLOC, sz, &pNew, pFree);
-    **
-    ** Pass pFree into sqlite3ScratchFree(). 
-    ** If sz>0 then allocate a scratch buffer into pNew.  
-    */
-    case SQLITE_TESTCTRL_SCRATCHMALLOC: {
-      void *pFree, **ppNew;
-      int sz;
-      sz = va_arg(ap, int);
-      ppNew = va_arg(ap, void**);
-      pFree = va_arg(ap, void*);
-      if( sz ) *ppNew = sqlite3ScratchMalloc(sz);
-      sqlite3ScratchFree(pFree);
-      break;
-    }
-
-    /*   sqlite3_test_control(SQLITE_TESTCTRL_LOCALTIME_FAULT, int onoff);
-    **
-    ** If parameter onoff is non-zero, configure the wrappers so that all
-    ** subsequent calls to localtime() and variants fail. If onoff is zero,
-    ** undo this setting.
-    */
-    case SQLITE_TESTCTRL_LOCALTIME_FAULT: {
-      sqlite3GlobalConfig.bLocaltimeFault = va_arg(ap, int);
-      break;
-    }
-
-    /*   sqlite3_test_control(SQLITE_TESTCTRL_NEVER_CORRUPT, int);
-    **
-    ** Set or clear a flag that indicates that the database file is always well-
-    ** formed and never corrupt.  This flag is clear by default, indicating that
-    ** database files might have arbitrary corruption.  Setting the flag during
-    ** testing causes certain assert() statements in the code to be activated
-    ** that demonstrat invariants on well-formed database files.
-    */
-    case SQLITE_TESTCTRL_NEVER_CORRUPT: {
-      sqlite3GlobalConfig.neverCorrupt = va_arg(ap, int);
-      break;
-    }
-
-
-    /*   sqlite3_test_control(SQLITE_TESTCTRL_VDBE_COVERAGE, xCallback, ptr);
-    **
-    ** Set the VDBE coverage callback function to xCallback with context 
-    ** pointer ptr.
-    */
-    case SQLITE_TESTCTRL_VDBE_COVERAGE: {
-#ifdef SQLITE_VDBE_COVERAGE
-      typedef void (*branch_callback)(void*,int,u8,u8);
-      sqlite3GlobalConfig.xVdbeBranch = va_arg(ap,branch_callback);
-      sqlite3GlobalConfig.pVdbeBranchArg = va_arg(ap,void*);
-#endif
-      break;
-    }
-
-    /*   sqlite3_test_control(SQLITE_TESTCTRL_SORTER_MMAP, db, nMax); */
-    case SQLITE_TESTCTRL_SORTER_MMAP: {
-      sqlite3 *db = va_arg(ap, sqlite3*);
-      db->nMaxSorterMmap = va_arg(ap, int);
-      break;
-    }
-
-    /*   sqlite3_test_control(SQLITE_TESTCTRL_ISINIT);
-    **
-    ** Return SQLITE_OK if SQLite has been initialized and SQLITE_ERROR if
-    ** not.
-    */
-    case SQLITE_TESTCTRL_ISINIT: {
-      if( sqlite3GlobalConfig.isInit==0 ) rc = SQLITE_ERROR;
-      break;
-    }
-
-    /*  sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, db, dbName, onOff, tnum);
-    **
-    ** This test control is used to create imposter tables.  "db" is a pointer
-    ** to the database connection.  dbName is the database name (ex: "main" or
-    ** "temp") which will receive the imposter.  "onOff" turns imposter mode on
-    ** or off.  "tnum" is the root page of the b-tree to which the imposter
-    ** table should connect.
-    **
-    ** Enable imposter mode only when the schema has already been parsed.  Then
-    ** run a single CREATE TABLE statement to construct the imposter table in
-    ** the parsed schema.  Then turn imposter mode back off again.
-    **
-    ** If onOff==0 and tnum>0 then reset the schema for all databases, causing
-    ** the schema to be reparsed the next time it is needed.  This has the
-    ** effect of erasing all imposter tables.
-    */
-    case SQLITE_TESTCTRL_IMPOSTER: {
-      sqlite3 *db = va_arg(ap, sqlite3*);
-      sqlite3_mutex_enter(db->mutex);
-      db->init.iDb = sqlite3FindDbName(db, va_arg(ap,const char*));
-      db->init.busy = db->init.imposterTable = va_arg(ap,int);
-      db->init.newTnum = va_arg(ap,int);
-      if( db->init.busy==0 && db->init.newTnum>0 ){
-        sqlite3ResetAllSchemasOfConnection(db);
-      }
-      sqlite3_mutex_leave(db->mutex);
-      break;
-    }
-  }
-  va_end(ap);
-#endif /* SQLITE_OMIT_BUILTIN_TEST */
-  return rc;
-}
-
-/*
-** This is a utility routine, useful to VFS implementations, that checks
-** to see if a database file was a URI that contained a specific query 
-** parameter, and if so obtains the value of the query parameter.
-**
-** The zFilename argument is the filename pointer passed into the xOpen()
-** method of a VFS implementation.  The zParam argument is the name of the
-** query parameter we seek.  This routine returns the value of the zParam
-** parameter if it exists.  If the parameter does not exist, this routine
-** returns a NULL pointer.
-*/
-const char *sqlite3_uri_parameter(const char *zFilename, const char *zParam){
-  if( zFilename==0 || zParam==0 ) return 0;
-  zFilename += sqlite3Strlen30(zFilename) + 1;
-  while( zFilename[0] ){
-    int x = strcmp(zFilename, zParam);
-    zFilename += sqlite3Strlen30(zFilename) + 1;
-    if( x==0 ) return zFilename;
-    zFilename += sqlite3Strlen30(zFilename) + 1;
-  }
-  return 0;
-}
-
-/*
-** Return a boolean value for a query parameter.
-*/
-int sqlite3_uri_boolean(const char *zFilename, const char *zParam, int bDflt){
-  const char *z = sqlite3_uri_parameter(zFilename, zParam);
-  bDflt = bDflt!=0;
-  return z ? sqlite3GetBoolean(z, bDflt) : bDflt;
-}
-
-/*
-** Return a 64-bit integer value for a query parameter.
-*/
-sqlite3_int64 sqlite3_uri_int64(
-  const char *zFilename,    /* Filename as passed to xOpen */
-  const char *zParam,       /* URI parameter sought */
-  sqlite3_int64 bDflt       /* return if parameter is missing */
-){
-  const char *z = sqlite3_uri_parameter(zFilename, zParam);
-  sqlite3_int64 v;
-  if( z && sqlite3DecOrHexToI64(z, &v)==SQLITE_OK ){
-    bDflt = v;
-  }
-  return bDflt;
-}
-
-/*
-** Return the Btree pointer identified by zDbName.  Return NULL if not found.
-*/
-Btree *sqlite3DbNameToBtree(sqlite3 *db, const char *zDbName){
-  int i;
-  for(i=0; i<db->nDb; i++){
-    if( db->aDb[i].pBt
-     && (zDbName==0 || sqlite3StrICmp(zDbName, db->aDb[i].zName)==0)
-    ){
-      return db->aDb[i].pBt;
-    }
-  }
-  return 0;
-}
-
-/*
-** Return the filename of the database associated with a database
-** connection.
-*/
-const char *sqlite3_db_filename(sqlite3 *db, const char *zDbName){
-  Btree *pBt;
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return 0;
-  }
-#endif
-  pBt = sqlite3DbNameToBtree(db, zDbName);
-  return pBt ? sqlite3BtreeGetFilename(pBt) : 0;
-}
-
-/*
-** Return 1 if database is read-only or 0 if read/write.  Return -1 if
-** no such database exists.
-*/
-int sqlite3_db_readonly(sqlite3 *db, const char *zDbName){
-  Btree *pBt;
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    (void)SQLITE_MISUSE_BKPT;
-    return -1;
-  }
-#endif
-  pBt = sqlite3DbNameToBtree(db, zDbName);
-  return pBt ? sqlite3BtreeIsReadonly(pBt) : -1;
-}
-
-#ifdef SQLITE_ENABLE_SNAPSHOT
-/*
-** Obtain a snapshot handle for the snapshot of database zDb currently 
-** being read by handle db.
-*/
-int sqlite3_snapshot_get(
-  sqlite3 *db, 
-  const char *zDb,
-  sqlite3_snapshot **ppSnapshot
-){
-  int rc = SQLITE_ERROR;
-#ifndef SQLITE_OMIT_WAL
-  int iDb;
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    return SQLITE_MISUSE_BKPT;
-  }
-#endif
-  sqlite3_mutex_enter(db->mutex);
-
-  iDb = sqlite3FindDbName(db, zDb);
-  if( iDb==0 || iDb>1 ){
-    Btree *pBt = db->aDb[iDb].pBt;
-    if( 0==sqlite3BtreeIsInTrans(pBt) ){
-      rc = sqlite3BtreeBeginTrans(pBt, 0);
-      if( rc==SQLITE_OK ){
-        rc = sqlite3PagerSnapshotGet(sqlite3BtreePager(pBt), ppSnapshot);
-      }
-    }
-  }
-
-  sqlite3_mutex_leave(db->mutex);
-#endif   /* SQLITE_OMIT_WAL */
-  return rc;
-}
-
-/*
-** Open a read-transaction on the snapshot idendified by pSnapshot.
-*/
-int sqlite3_snapshot_open(
-  sqlite3 *db, 
-  const char *zDb, 
-  sqlite3_snapshot *pSnapshot
-){
-  int rc = SQLITE_ERROR;
-#ifndef SQLITE_OMIT_WAL
-
-#ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
-    return SQLITE_MISUSE_BKPT;
-  }
-#endif
-  sqlite3_mutex_enter(db->mutex);
-  if( db->autoCommit==0 ){
-    int iDb;
-    iDb = sqlite3FindDbName(db, zDb);
-    if( iDb==0 || iDb>1 ){
-      Btree *pBt = db->aDb[iDb].pBt;
-      if( 0==sqlite3BtreeIsInReadTrans(pBt) ){
-        rc = sqlite3PagerSnapshotOpen(sqlite3BtreePager(pBt), pSnapshot);
-        if( rc==SQLITE_OK ){
-          rc = sqlite3BtreeBeginTrans(pBt, 0);
-          sqlite3PagerSnapshotOpen(sqlite3BtreePager(pBt), 0);
-        }
-      }
-    }
-  }
-
-  sqlite3_mutex_leave(db->mutex);
-#endif   /* SQLITE_OMIT_WAL */
-  return rc;
-}
-
-/*
-** Free a snapshot handle obtained from sqlite3_snapshot_get().
-*/
-void sqlite3_snapshot_free(sqlite3_snapshot *pSnapshot){
-  sqlite3_free(pSnapshot);
-}
-#endif /* SQLITE_ENABLE_SNAPSHOT */