1.1 --- a/extensions/sqlite/sqlite-source/malloc.c Fri Jul 11 06:51:21 2008 +0000
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,240 +0,0 @@
1.4 -/*
1.5 -** 2001 September 15
1.6 -**
1.7 -** The author disclaims copyright to this source code. In place of
1.8 -** a legal notice, here is a blessing:
1.9 -**
1.10 -** May you do good and not evil.
1.11 -** May you find forgiveness for yourself and forgive others.
1.12 -** May you share freely, never taking more than you give.
1.13 -**
1.14 -*************************************************************************
1.15 -** Memory allocation functions used throughout sqlite.
1.16 -**
1.17 -**
1.18 -** $Id$
1.19 -*/
1.20 -#include "sqliteInt.h"
1.21 -#include <stdarg.h>
1.22 -#include <ctype.h>
1.23 -
1.24 -/*
1.25 -** This routine runs when the memory allocator sees that the
1.26 -** total memory allocation is about to exceed the soft heap
1.27 -** limit.
1.28 -*/
1.29 -static void softHeapLimitEnforcer(
1.30 - void *NotUsed,
1.31 - sqlite3_int64 inUse,
1.32 - int allocSize
1.33 -){
1.34 - sqlite3_release_memory(allocSize);
1.35 -}
1.36 -
1.37 -/*
1.38 -** Set the soft heap-size limit for the current thread. Passing a
1.39 -** zero or negative value indicates no limit.
1.40 -*/
1.41 -void sqlite3_soft_heap_limit(int n){
1.42 - sqlite3_uint64 iLimit;
1.43 - int overage;
1.44 - if( n<0 ){
1.45 - iLimit = 0;
1.46 - }else{
1.47 - iLimit = n;
1.48 - }
1.49 - if( iLimit>0 ){
1.50 - sqlite3_memory_alarm(softHeapLimitEnforcer, 0, iLimit);
1.51 - }else{
1.52 - sqlite3_memory_alarm(0, 0, 0);
1.53 - }
1.54 - overage = sqlite3_memory_used() - n;
1.55 - if( overage>0 ){
1.56 - sqlite3_release_memory(overage);
1.57 - }
1.58 -}
1.59 -
1.60 -/*
1.61 -** Release memory held by SQLite instances created by the current thread.
1.62 -*/
1.63 -int sqlite3_release_memory(int n){
1.64 -#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
1.65 - return sqlite3PagerReleaseMemory(n);
1.66 -#else
1.67 - return SQLITE_OK;
1.68 -#endif
1.69 -}
1.70 -
1.71 -
1.72 -/*
1.73 -** Allocate and zero memory.
1.74 -*/
1.75 -void *sqlite3MallocZero(unsigned n){
1.76 - void *p = sqlite3_malloc(n);
1.77 - if( p ){
1.78 - memset(p, 0, n);
1.79 - }
1.80 - return p;
1.81 -}
1.82 -
1.83 -/*
1.84 -** Allocate and zero memory. If the allocation fails, make
1.85 -** the mallocFailed flag in the connection pointer.
1.86 -*/
1.87 -void *sqlite3DbMallocZero(sqlite3 *db, unsigned n){
1.88 - void *p = sqlite3DbMallocRaw(db, n);
1.89 - if( p ){
1.90 - memset(p, 0, n);
1.91 - }
1.92 - return p;
1.93 -}
1.94 -
1.95 -/*
1.96 -** Allocate and zero memory. If the allocation fails, make
1.97 -** the mallocFailed flag in the connection pointer.
1.98 -*/
1.99 -void *sqlite3DbMallocRaw(sqlite3 *db, unsigned n){
1.100 - void *p = 0;
1.101 - if( !db || db->mallocFailed==0 ){
1.102 - p = sqlite3_malloc(n);
1.103 - if( !p && db ){
1.104 - db->mallocFailed = 1;
1.105 - }
1.106 - }
1.107 - return p;
1.108 -}
1.109 -
1.110 -/*
1.111 -** Resize the block of memory pointed to by p to n bytes. If the
1.112 -** resize fails, set the mallocFailed flag inthe connection object.
1.113 -*/
1.114 -void *sqlite3DbRealloc(sqlite3 *db, void *p, int n){
1.115 - void *pNew = 0;
1.116 - if( db->mallocFailed==0 ){
1.117 - pNew = sqlite3_realloc(p, n);
1.118 - if( !pNew ){
1.119 - db->mallocFailed = 1;
1.120 - }
1.121 - }
1.122 - return pNew;
1.123 -}
1.124 -
1.125 -/*
1.126 -** Attempt to reallocate p. If the reallocation fails, then free p
1.127 -** and set the mallocFailed flag in the database connection.
1.128 -*/
1.129 -void *sqlite3DbReallocOrFree(sqlite3 *db, void *p, int n){
1.130 - void *pNew;
1.131 - pNew = sqlite3DbRealloc(db, p, n);
1.132 - if( !pNew ){
1.133 - sqlite3_free(p);
1.134 - }
1.135 - return pNew;
1.136 -}
1.137 -
1.138 -/*
1.139 -** Make a copy of a string in memory obtained from sqliteMalloc(). These
1.140 -** functions call sqlite3MallocRaw() directly instead of sqliteMalloc(). This
1.141 -** is because when memory debugging is turned on, these two functions are
1.142 -** called via macros that record the current file and line number in the
1.143 -** ThreadData structure.
1.144 -*/
1.145 -char *sqlite3StrDup(const char *z){
1.146 - char *zNew;
1.147 - int n;
1.148 - if( z==0 ) return 0;
1.149 - n = strlen(z)+1;
1.150 - zNew = sqlite3_malloc(n);
1.151 - if( zNew ) memcpy(zNew, z, n);
1.152 - return zNew;
1.153 -}
1.154 -char *sqlite3StrNDup(const char *z, int n){
1.155 - char *zNew;
1.156 - if( z==0 ) return 0;
1.157 - zNew = sqlite3_malloc(n+1);
1.158 - if( zNew ){
1.159 - memcpy(zNew, z, n);
1.160 - zNew[n] = 0;
1.161 - }
1.162 - return zNew;
1.163 -}
1.164 -
1.165 -char *sqlite3DbStrDup(sqlite3 *db, const char *z){
1.166 - char *zNew = sqlite3StrDup(z);
1.167 - if( z && !zNew ){
1.168 - db->mallocFailed = 1;
1.169 - }
1.170 - return zNew;
1.171 -}
1.172 -char *sqlite3DbStrNDup(sqlite3 *db, const char *z, int n){
1.173 - char *zNew = sqlite3StrNDup(z, n);
1.174 - if( z && !zNew ){
1.175 - db->mallocFailed = 1;
1.176 - }
1.177 - return zNew;
1.178 -}
1.179 -
1.180 -/*
1.181 -** Create a string from the 2nd and subsequent arguments (up to the
1.182 -** first NULL argument), store the string in memory obtained from
1.183 -** sqliteMalloc() and make the pointer indicated by the 1st argument
1.184 -** point to that string. The 1st argument must either be NULL or
1.185 -** point to memory obtained from sqliteMalloc().
1.186 -*/
1.187 -void sqlite3SetString(char **pz, ...){
1.188 - va_list ap;
1.189 - int nByte;
1.190 - const char *z;
1.191 - char *zResult;
1.192 -
1.193 - assert( pz!=0 );
1.194 - nByte = 1;
1.195 - va_start(ap, pz);
1.196 - while( (z = va_arg(ap, const char*))!=0 ){
1.197 - nByte += strlen(z);
1.198 - }
1.199 - va_end(ap);
1.200 - sqlite3_free(*pz);
1.201 - *pz = zResult = sqlite3_malloc(nByte);
1.202 - if( zResult==0 ){
1.203 - return;
1.204 - }
1.205 - *zResult = 0;
1.206 - va_start(ap, pz);
1.207 - while( (z = va_arg(ap, const char*))!=0 ){
1.208 - int n = strlen(z);
1.209 - memcpy(zResult, z, n);
1.210 - zResult += n;
1.211 - }
1.212 - zResult[0] = 0;
1.213 - va_end(ap);
1.214 -}
1.215 -
1.216 -
1.217 -/*
1.218 -** This function must be called before exiting any API function (i.e.
1.219 -** returning control to the user) that has called sqlite3_malloc or
1.220 -** sqlite3_realloc.
1.221 -**
1.222 -** The returned value is normally a copy of the second argument to this
1.223 -** function. However, if a malloc() failure has occured since the previous
1.224 -** invocation SQLITE_NOMEM is returned instead.
1.225 -**
1.226 -** If the first argument, db, is not NULL and a malloc() error has occured,
1.227 -** then the connection error-code (the value returned by sqlite3_errcode())
1.228 -** is set to SQLITE_NOMEM.
1.229 -*/
1.230 -int sqlite3ApiExit(sqlite3* db, int rc){
1.231 - /* If the db handle is not NULL, then we must hold the connection handle
1.232 - ** mutex here. Otherwise the read (and possible write) of db->mallocFailed
1.233 - ** is unsafe, as is the call to sqlite3Error().
1.234 - */
1.235 - assert( !db || sqlite3_mutex_held(db->mutex) );
1.236 - if( db && db->mallocFailed ){
1.237 - sqlite3Error(db, SQLITE_NOMEM, 0);
1.238 - db->mallocFailed = 0;
1.239 - rc = SQLITE_NOMEM;
1.240 - }
1.241 - return rc & (db ? db->errMask : 0xff);
1.242 -}
1.243 -
