--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/engine/sqlite/src/malloc.cpp Thu Feb 25 14:29:19 2010 +0000
@@ -0,0 +1,241 @@
+/*
+** 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.
+**
+*************************************************************************
+** Memory allocation functions used throughout sqlite.
+**
+**
+** $Id: malloc.cpp 1282 2008-11-13 09:31:33Z LarsPson $
+*/
+#include "sqliteInt.h"
+#include <stdarg.h>
+#include <ctype.h>
+
+/*
+** This routine runs when the memory allocator sees that the
+** total memory allocation is about to exceed the soft heap
+** limit.
+*/
+static void softHeapLimitEnforcer(
+ void *NotUsed,
+ sqlite3_int64 inUse,
+ int allocSize
+){
+ sqlite3_release_memory(allocSize);
+}
+
+/*
+** Set the soft heap-size limit for the current thread. Passing a
+** zero or negative value indicates no limit.
+*/
+EXPORT_C void sqlite3_soft_heap_limit(int n){
+ sqlite3_uint64 iLimit;
+ int overage;
+ if( n<0 ){
+ iLimit = 0;
+ }else{
+ iLimit = n;
+ }
+ if( iLimit>0 ){
+ sqlite3_memory_alarm(softHeapLimitEnforcer, 0, iLimit);
+ }else{
+ sqlite3_memory_alarm(0, 0, 0);
+ }
+ overage = sqlite3_memory_used() - n;
+ if( overage>0 ){
+ sqlite3_release_memory(overage);
+ }
+}
+
+/*
+** Release memory held by SQLite instances created by the current thread.
+*/
+EXPORT_C int sqlite3_release_memory(int n){
+#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
+ return sqlite3PagerReleaseMemory(n);
+#else
+ return SQLITE_OK;
+#endif
+}
+
+
+/*
+** Allocate and zero memory.
+*/
+void *sqlite3MallocZero(unsigned n){
+
+ void *p = sqlite3_malloc(n);
+ if( p ){
+ memset(p, 0, n);
+ }
+
+ return p;
+}
+
+/*
+** Allocate and zero memory. If the allocation fails, make
+** the mallocFailed flag in the connection pointer.
+*/
+void *sqlite3DbMallocZero(sqlite3 *db, unsigned n){
+ void *p = sqlite3DbMallocRaw(db, n);
+ if( p ){
+ memset(p, 0, n);
+ }
+ return p;
+}
+
+/*
+** Allocate and zero memory. If the allocation fails, make
+** the mallocFailed flag in the connection pointer.
+*/
+void *sqlite3DbMallocRaw(sqlite3 *db, unsigned n){
+ void *p = 0;
+ if( !db || db->mallocFailed==0 ){
+ p = sqlite3_malloc(n);
+ if( !p && db ){
+ db->mallocFailed = 1;
+ }
+ }
+ return p;
+}
+
+/*
+** Resize the block of memory pointed to by p to n bytes. If the
+** resize fails, set the mallocFailed flag inthe connection object.
+*/
+void *sqlite3DbRealloc(sqlite3 *db, void *p, int n){
+ void *pNew = 0;
+ if( db->mallocFailed==0 ){
+ pNew = sqlite3_realloc(p, n);
+ if( !pNew ){
+ db->mallocFailed = 1;
+ }
+ }
+ return pNew;
+}
+
+/*
+** Attempt to reallocate p. If the reallocation fails, then free p
+** and set the mallocFailed flag in the database connection.
+*/
+void *sqlite3DbReallocOrFree(sqlite3 *db, void *p, int n){
+ void *pNew;
+ pNew = sqlite3DbRealloc(db, p, n);
+ if( !pNew ){
+ sqlite3_free(p);
+ }
+ return pNew;
+}
+
+/*
+** Make a copy of a string in memory obtained from sqliteMalloc(). These
+** functions call sqlite3MallocRaw() directly instead of sqliteMalloc(). This
+** is because when memory debugging is turned on, these two functions are
+** called via macros that record the current file and line number in the
+** ThreadData structure.
+*/
+char *sqlite3StrDup(const char *z){
+ char *zNew;
+ int n;
+ if( z==0 ) return 0;
+ n = strlen(z)+1;
+ zNew = (char*)sqlite3_malloc(n);
+ if( zNew ) memcpy(zNew, z, n);
+ return zNew;
+}
+char *sqlite3StrNDup(const char *z, int n){
+ char *zNew;
+ if( z==0 ) return 0;
+ zNew = (char*)sqlite3_malloc(n+1);
+ if( zNew ){
+ memcpy(zNew, z, n);
+ zNew[n] = 0;
+ }
+ return zNew;
+}
+
+char *sqlite3DbStrDup(sqlite3 *db, const char *z){
+ char *zNew = sqlite3StrDup(z);
+ if( z && !zNew ){
+ db->mallocFailed = 1;
+ }
+ return zNew;
+}
+char *sqlite3DbStrNDup(sqlite3 *db, const char *z, int n){
+ char *zNew = sqlite3StrNDup(z, n);
+ if( z && !zNew ){
+ db->mallocFailed = 1;
+ }
+ return zNew;
+}
+
+/*
+** Create a string from the 2nd and subsequent arguments (up to the
+** first NULL argument), store the string in memory obtained from
+** sqliteMalloc() and make the pointer indicated by the 1st argument
+** point to that string. The 1st argument must either be NULL or
+** point to memory obtained from sqliteMalloc().
+*/
+void sqlite3SetString(char **pz, ...){
+ va_list ap;
+ int nByte;
+ const char *z;
+ char *zResult;
+
+ assert( pz!=0 );
+ nByte = 1;
+ va_start(ap, pz);
+ while( (z = va_arg(ap, const char*))!=0 ){
+ nByte += strlen(z);
+ }
+ va_end(ap);
+ sqlite3_free(*pz);
+ *pz = zResult = (char*)sqlite3_malloc(nByte);
+ if( zResult==0 ){
+ return;
+ }
+ *zResult = 0;
+ va_start(ap, pz);
+ while( (z = va_arg(ap, const char*))!=0 ){
+ int n = strlen(z);
+ memcpy(zResult, z, n);
+ zResult += n;
+ }
+ zResult[0] = 0;
+ va_end(ap);
+}
+
+
+/*
+** This function must be called before exiting any API function (i.e.
+** returning control to the user) that has called sqlite3_malloc or
+** sqlite3_realloc.
+**
+** The returned value is normally a copy of the second argument to this
+** function. However, if a malloc() failure has occured since the previous
+** invocation SQLITE_NOMEM is returned instead.
+**
+** If the first argument, db, is not NULL and a malloc() error has occured,
+** then the connection error-code (the value returned by sqlite3_errcode())
+** is set to SQLITE_NOMEM.
+*/
+int sqlite3ApiExit(sqlite3* db, int rc){
+ /* If the db handle is not NULL, then we must hold the connection handle
+ ** mutex here. Otherwise the read (and possible write) of db->mallocFailed
+ ** is unsafe, as is the call to sqlite3Error().
+ */
+ assert( !db || sqlite3_mutex_held(db->mutex) );
+ if( db && db->mallocFailed ){
+ sqlite3Error(db, SQLITE_NOMEM, 0);
+ db->mallocFailed = 0;
+ rc = SQLITE_NOMEM;
+ }
+ return rc & (db ? db->errMask : 0xff);
+}