SQLite

**    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.c,v 1.56 2009/02/17 18:37:29 drh Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>

/*
** This routine runs when the memory allocator sees that the
** total memory allocation is about to exceed the soft heap

/*
** Allocate memory.  This routine is like sqlite3_malloc() except that it
** assumes the memory subsystem has already been initialized.
*/
void *sqlite3Malloc(int n){
  void *p;
  if( n<=0 || NEVER(n>=0x7fffff00) ){
    /* The NEVER(n>=0x7fffff00) term is added out of paranoia.  We want to make
    ** absolutely sure that there is nothing within SQLite that can cause a
    ** memory allocation of a number of bytes which is near the maximum signed
    ** integer value and thus cause an integer overflow inside of the xMalloc()
    ** implementation.  The n>=0x7fffff00 gives us 255 bytes of headroom.  The
    ** test should never be true because SQLITE_MAX_LENGTH should be much
    ** less than 0x7fffff00 and it should catch large memory allocations
    ** before they reach this point. */
    p = 0;
  }else if( sqlite3GlobalConfig.bMemstat ){
    sqlite3_mutex_enter(mem0.mutex);
    mallocWithAlarm(n, &p);
    sqlite3_mutex_leave(mem0.mutex);
  }else{
    p = sqlite3GlobalConfig.m.xMalloc(n);

*/
void *sqlite3Realloc(void *pOld, int nBytes){
  int nOld, nNew;
  void *pNew;
  if( pOld==0 ){
    return sqlite3Malloc(nBytes);
  }
  if( nBytes<=0 || NEVER(nBytes>=0x7fffff00) ){
    /* The NEVER(...) term is explained in comments on sqlite3Malloc() */
    sqlite3_free(pOld);
    return 0;
  }
  nOld = sqlite3MallocSize(pOld);
  if( sqlite3GlobalConfig.bMemstat ){
    sqlite3_mutex_enter(mem0.mutex);
    sqlite3StatusSet(SQLITE_STATUS_MALLOC_SIZE, nBytes);