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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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msize.c
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1998-06-17
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/***
*msize.c - calculate the size of a memory block in the heap
*
* Copyright (c) 1989-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Defines the following function:
* _msize() - calculate the size of a block in the heap
*
*******************************************************************************/
#ifdef WINHEAP
#include <cruntime.h>
#include <malloc.h>
#include <mtdll.h>
#include <winheap.h>
#include <windows.h>
#include <dbgint.h>
/***
*size_t _msize(pblock) - calculate the size of specified block in the heap
*
*Purpose:
* Calculates the size of memory block (in the heap) pointed to by
* pblock.
*
*Entry:
* void *pblock - pointer to a memory block in the heap
*
*Return:
* size of the block
*
*******************************************************************************/
size_t __cdecl _msize_base (void * pblock)
{
size_t retval;
_mlock(_HEAP_LOCK);
if (__sbh_find_block(pblock) != NULL)
{
retval = (size_t)
(((PENTRY)((char *)pblock - sizeof(int)))->sizeFront - 0x9);
_munlock(_HEAP_LOCK);
}
else
{
_munlock(_HEAP_LOCK);
retval = (size_t)HeapSize(_crtheap, 0, pblock);
}
return retval;
}
#else /* WINHEAP */
#include <cruntime.h>
#include <heap.h>
#include <malloc.h>
#include <mtdll.h>
#include <stdlib.h>
#include <dbgint.h>
/***
*size_t _msize(pblock) - calculate the size of specified block in the heap
*
*Purpose:
* Calculates the size of memory block (in the heap) pointed to by
* pblock.
*
*Entry:
* void *pblock - pointer to a memory block in the heap
*
*Return:
* size of the block
*
*******************************************************************************/
#ifdef _MT
size_t __cdecl _msize_base (
void *pblock
)
{
size_t retval;
/* lock the heap
*/
_mlock(_HEAP_LOCK);
retval = _msize_lk(pblock);
/* release the heap lock
*/
_munlock(_HEAP_LOCK);
return retval;
}
size_t __cdecl _msize_lk (
#else /* _MT */
size_t __cdecl _msize_base (
#endif /* _MT */
void *pblock
)
{
return( (size_t) ((char *)_ADDRESS(_BACKPTR(pblock)->pnextdesc) -
(char *)pblock) );
}
#endif /* WINHEAP */