sqlcipher/src/main.c at Xcode5 · securitykernel/sqlcipher · GitHub

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** 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

#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; }

#if !defined(SQLITE_OMIT_TRACE) && defined(SQLITE_ENABLE_IOTRACE)

** If the following function pointer is not NULL and if

** SQLITE_ENABLE_IOTRACE is enabled, then messages describing

** I/O active are written using this function. These messages

** are intended for debugging activity only.

void (*sqlite3IoTrace)(const char*, ...) = 0;

#endif

** If the following global variable points to a string which is the

** name of a directory, then that directory will be used to store

** temporary files.

** See also the "PRAGMA temp_store_directory" SQL command.

char *sqlite3_temp_directory = 0;

** 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 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;

#ifdef SQLITE_ENABLE_SQLLOG

{

extern void sqlite3_init_sqllog(void);

sqlite3_init_sqllog();

}

#endif

/* 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;

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

/* 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){

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

case SQLITE_CONFIG_SINGLETHREAD: {

/* Disable all mutexing */

sqlite3GlobalConfig.bCoreMutex = 0;

sqlite3GlobalConfig.bFullMutex = 0;

break;

}

case SQLITE_CONFIG_MULTITHREAD: {

/* Disable mutexing of database connections */

/* Enable mutexing of core data structures */

sqlite3GlobalConfig.bCoreMutex = 1;

sqlite3GlobalConfig.bFullMutex = 0;

break;

}

case SQLITE_CONFIG_SERIALIZED: {

/* Enable all mutexing */

sqlite3GlobalConfig.bCoreMutex = 1;

sqlite3GlobalConfig.bFullMutex = 1;

break;

}

case SQLITE_CONFIG_MUTEX: {

/* Specify an alternative mutex implementation */

sqlite3GlobalConfig.mutex = *va_arg(ap, sqlite3_mutex_methods*);

break;

}

case SQLITE_CONFIG_GETMUTEX: {

/* Retrieve the current mutex implementation */

*va_arg(ap, sqlite3_mutex_methods*) = sqlite3GlobalConfig.mutex;

break;

}

#endif

case SQLITE_CONFIG_MALLOC: {

/* Specify an alternative malloc implementation */

sqlite3GlobalConfig.m = *va_arg(ap, sqlite3_mem_methods*);

break;

}

case SQLITE_CONFIG_GETMALLOC: {

/* Retrieve the current malloc() implementation */

if( sqlite3GlobalConfig.m.xMalloc==0 ) sqlite3MemSetDefault();

*va_arg(ap, sqlite3_mem_methods*) = sqlite3GlobalConfig.m;

break;

}

case SQLITE_CONFIG_MEMSTATUS: {

/* Enable or disable the malloc status collection */

sqlite3GlobalConfig.bMemstat = va_arg(ap, int);

break;

}

case SQLITE_CONFIG_SCRATCH: {

/* Designate a buffer for scratch memory space */

sqlite3GlobalConfig.pScratch = va_arg(ap, void*);

sqlite3GlobalConfig.szScratch = va_arg(ap, int);

sqlite3GlobalConfig.nScratch = va_arg(ap, int);

break;

}

case SQLITE_CONFIG_PAGECACHE: {

/* Designate a buffer for page cache memory space */

sqlite3GlobalConfig.pPage = va_arg(ap, void*);

sqlite3GlobalConfig.szPage = va_arg(ap, int);

sqlite3GlobalConfig.nPage = va_arg(ap, int);

break;

}

case SQLITE_CONFIG_PCACHE: {

/* no-op */

break;

}

case SQLITE_CONFIG_GETPCACHE: {

/* now an error */

rc = SQLITE_ERROR;

break;

}

case SQLITE_CONFIG_PCACHE2: {

/* Specify an alternative page cache implementation */

sqlite3GlobalConfig.pcache2 = *va_arg(ap, sqlite3_pcache_methods2*);

break;

}

case SQLITE_CONFIG_GETPCACHE2: {

if( sqlite3GlobalConfig.pcache2.xInit==0 ){

sqlite3PCacheSetDefault();

}

*va_arg(ap, sqlite3_pcache_methods2*) = sqlite3GlobalConfig.pcache2;

break;

}

#if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5)

case SQLITE_CONFIG_HEAP: {

/* Designate a buffer for heap memory space */

sqlite3GlobalConfig.pHeap = va_arg(ap, void*);

sqlite3GlobalConfig.nHeap = va_arg(ap, int);

sqlite3GlobalConfig.mnReq = va_arg(ap, int);

if( sqlite3GlobalConfig.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 ){

/* If the heap pointer is NULL, then restore the malloc implementation

** back to NULL pointers too. This will cause the malloc to go

** back to its default implementation when sqlite3_initialize() is

** run.

memset(&sqlite3GlobalConfig.m, 0, sizeof(sqlite3GlobalConfig.m));

}else{

/* The heap pointer is not NULL, then install one of the

** mem5.c/mem3.c methods. The enclosing #if guarantees at

** least one of these methods is currently enabled.

#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;

}

case SQLITE_CONFIG_URI: {

sqlite3GlobalConfig.bOpenUri = va_arg(ap, int);

break;

}

case SQLITE_CONFIG_COVERING_INDEX_SCAN: {

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: {

sqlite3_int64 szMmap = va_arg(ap, sqlite3_int64);

sqlite3_int64 mxMmap = va_arg(ap, sqlite3_int64);

if( mxMmap<0 || mxMmap>SQLITE_MAX_MMAP_SIZE ){

mxMmap = SQLITE_MAX_MMAP_SIZE;

}

sqlite3GlobalConfig.mxMmap = mxMmap;

if( szMmap<0 ) szMmap = SQLITE_DEFAULT_MMAP_SIZE;

if( szMmap>mxMmap) szMmap = mxMmap;

sqlite3GlobalConfig.szMmap = szMmap;

break;

}

default: {

rc = SQLITE_ERROR;

break;

}

va_end(ap);

return rc;

}

** Set up the lookaside buffers for a database connection.

** Return SQLITE_OK on success.

** If lookaside is already active, return SQLITE_BUSY.

** The sz parameter is the number of bytes in each lookaside slot.

** The cnt parameter is the number of slots. If pStart is NULL the

** space for the lookaside memory is obtained from sqlite3_malloc().

** If pStart is not NULL then it is sz*cnt bytes of memory to use for

** the lookaside memory.

static int setupLookaside(sqlite3 *db, void *pBuf, int sz, int cnt){

void *pStart;

if( db->lookaside.nOut ){

return SQLITE_BUSY;

}

/* Free any existing lookaside buffer for this handle before

** allocating a new one so we don't have to have space for

** both at the same time.

if( db->lookaside.bMalloced ){

sqlite3_free(db->lookaside.pStart);

}

/* The size of a lookaside slot 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.pEnd = 0;

db->lookaside.bEnabled = 0;

db->lookaside.bMalloced = 0;

}

return SQLITE_OK;

}

** Return the mutex associated with a database connection.

sqlite3_mutex *sqlite3_db_mutex(sqlite3 *db){

return db->mutex;

}

** Free up as much memory as we can from the given database

** connection.

int sqlite3_db_release_memory(sqlite3 *db){

int i;

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;

}

** 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;

rc = memcmp(pKey1, pKey2, n);

if( rc==0 ){

if( padFlag

&& allSpaces(((char*)pKey1)+n, nKey1-n)

&& allSpaces(((char*)pKey2)+n, nKey2-n)

){

/* Leave rc unchanged at 0 */

}else{

rc = nKey1 - nKey2;

}

return rc;

}

** Another built-in collating sequence: NOCASE.

** This collating sequence is intended to be used for "case 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){

return db->lastRowid;

}

** Return the number of changes in the most recent call to sqlite3_exec().

int sqlite3_changes(sqlite3 *db){

return db->nChange;

}

** Return the number of changes since the database handle was opened.

int sqlite3_total_changes(sqlite3 *db){

return db->nTotalChange;

}

** Close all open savepoints. This function only manipulates fields of the

** database handle object, it does not close any savepoints that may be open

** at the b-tree/pager level.

void sqlite3CloseSavepoints(sqlite3 *db){

while( db->pSavepoint ){

Savepoint *pTmp = db->pSavepoint;

db->pSavepoint = pTmp->pNext;

sqlite3DbFree(db, pTmp);

}

db->nSavepoint = 0;

db->nStatement = 0;

db->isTransactionSavepoint = 0;

}

** 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;

sqlite3BtreeEnterAll(db);

for(i=0; i<db->nDb; i++){

Schema *pSchema = db->aDb[i].pSchema;

if( db->aDb[i].pSchema ){

HashElem *p;

for(p=sqliteHashFirst(&pSchema->tblHash); p; p=sqliteHashNext(p)){

Table *pTab = (Table *)sqliteHashData(p);

if( IsVirtual(pTab) ) sqlite3VtabDisconnect(db, pTab);

}

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 ){

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) ){

sqlite3Error(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);

}

sqlite3DbFree(db, pMod);

}

sqlite3HashClear(&db->aModule);

#endif

sqlite3Error(db, SQLITE_OK, 0); /* Deallocates any cached error strings. */

if( db->pErr ){

sqlite3ValueFree(db->pErr);

}

sqlite3CloseExtensions(db);

db->magic = SQLITE_MAGIC_ERROR;

/* The temp-database schema is allocated differently from the other schema

** objects (using sqliteMalloc() directly, instead of sqlite3BtreeSchema()).

** So it needs to be freed here. Todo: Why not roll the temp schema into

** the same sqliteMalloc() as the one that allocates the database

** structure?

sqlite3DbFree(db, db->aDb[1].pSchema);

sqlite3_mutex_leave(db->mutex);

db->magic = SQLITE_MAGIC_CLOSED;

sqlite3_mutex_free(db->mutex);

assert( db->lookaside.nOut==0 ); /* Fails on a lookaside memory leak */

if( db->lookaside.bMalloced ){

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