static void *sqlite3MemRealloc(void *pPrior, int nByte){
int *pOld = ((int *)pPrior) - 1, szOld = *pOld;
void *pNew;
if( nByte <= szOld ){
return pPrior;
} else {
pNew = sqlite3MemMalloc(nByte);
if (!pNew) return 0;
memcpy(pNew, pPrior, szOld);
sqlite3MemFree(pPrior);
return pNew;
}
}
/*
** Change the size of an existing memory allocation.
**
** For this debugging implementation, we *always* make a copy of the
** allocation into a new place in memory. In this way, if the
** higher level code is using pointer to the old allocation, it is
** much more likely to break and we are much more liking to find
** the error.
*/
static void *sqlite3MemRealloc(void *pPrior, int nByte){
struct MemBlockHdr *pOldHdr;
void *pNew;
assert( mem.disallow==0 );
pOldHdr = sqlite3MemsysGetHeader(pPrior);
pNew = sqlite3MemMalloc(nByte);
if( pNew ){
memcpy(pNew, pPrior, nByte<pOldHdr->iSize ? nByte : pOldHdr->iSize);
if( nByte>pOldHdr->iSize ){
memset(&((char*)pNew)[pOldHdr->iSize], 0x2b, nByte - pOldHdr->iSize);
}
sqlite3MemFree(pPrior);
}
return pNew;
}
