/*********************************************************************
*
* GUI_ALLOC_Realloc
*
* Purpose:
* Reallocate a memory block. This is typically used to grow memory
* blocks. The contents of the old memory block are copied into the
* new block (or as much as fits in case of shrinkage).
* In case of error the old memory block (and its handle) remain
* unchanged.
*
* Return value:
* On success: Handle of newly allocated memory block
* On error: 0
*/
GUI_HMEM GUI_ALLOC_Realloc(GUI_HMEM hOld, int NewSize) {
GUI_HMEM hNew;
hNew = GUI_ALLOC_AllocNoInit(NewSize);
if (hNew && hOld) {
void *pNew, *pOld;
int Size, OldSize;
OldSize = GUI_ALLOC_GetSize(hOld);
Size = (OldSize < NewSize) ? OldSize : NewSize;
GUI_LOCK();
pNew = GUI_ALLOC_h2p(hNew);
pOld = GUI_ALLOC_h2p(hOld);
memcpy(pNew, pOld, Size);
GUI_UNLOCK();
GUI_ALLOC_Free(hOld);
}
return hNew;
}
/*********************************************************************
*
* _CalcNumBytes
*/
static int _CalcNumBytes(WM_HWIN hWin, int NumBytes) {
return Min(GUI_ALLOC_GetSize(hWin) - sizeof(WM_Obj), NumBytes);
}
