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/***
*msize.c - calculate the size of a memory block in the heap
*
* Copyright (c) 1989-1991, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Defines the following function:
* _msize() - calculate the size of a block in the heap
*
*Revision History:
* 07-18-89 GJF Module created
* 11-13-89 GJF Added MTHREAD support. Also fixed copyright and got
* rid of DEBUG286 stuff.
* 12-18-89 GJF Changed name of header file to heap.h, also added
* explicit _cdecl to function definitions.
* 03-11-90 GJF Replaced _cdecl with _CALLTYPE1 and added #include
* <cruntime.h>
* 07-30-90 SBM Added return statement to MTHREAD _msize function
* 09-28-90 GJF New-style function declarators.
* 04-08-91 GJF Temporary hack for Win32/DOS folks - special version
* of _msize that calls HeapSize. Change conditioned on
* _WIN32DOS_.
*
*******************************************************************************/
#ifndef _WIN32DOS_
#include <cruntime.h>
#include <heap.h>
#include <malloc.h>
#include <os2dll.h>
#include <stdlib.h>
/***
*size_t _msize(pblck) - calculate the size of specified block in the heap
*
*Purpose:
* Calculates the size of memory block (in the heap) pointed to by
* pblck.
*
*Entry:
* void *pblck - pointer to a memory block in the heap
*
*Return:
* size of the block
*
*******************************************************************************/
#ifdef MTHREAD
size_t _CALLTYPE1 _msize (
void *pblck
)
{
size_t retval;
/* lock the heap
*/
_mlock(_HEAP_LOCK);
retval = _msize_lk(pblck);
/* release the heap lock
*/
_munlock(_HEAP_LOCK);
return retval;
}
size_t _CALLTYPE1 _msize_lk (
#else /* ndef MTHREAD */
size_t _CALLTYPE1 _msize (
#endif /* MTHREAD */
void *pblck
)
{
#ifdef DEBUG
if (!_CHECK_BACKPTR(pblck))
_heap_abort();
#endif
return( (size_t) ((char *)_ADDRESS(_BACKPTR(pblck)->pnextdesc) -
(char *)pblck) );
}
#else /* _WIN32DOS_ */
/*
* TEMPORARY HACK! THE CODE BELOW IS INTENDED TO ALLOW LIMITED USE OF THE
* C RUNTIME ON WIN32/DOS. IT WILL BE DELETED AS SOON AS THEY IMPLEMENT
* VirtualAlloc()!
*/
#include <cruntime.h>
#include <oscalls.h>
#include <malloc.h>
extern HANDLE _HeapHandle;
size_t _CALLTYPE1 _msize (
void *pblck
)
{
return( (size_t)HeapSize(_HeapHandle, pblck) );
}
#endif /* _WIN32DOS_ */
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