102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/***
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*heapwalk.c - walk the heap
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*
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* Copyright (c) 1989-1991, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Defines the _heapwalk() function
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*
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*Revision History:
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* 07-05-89 JCR Module created.
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* 11-13-89 GJF Added MTHREAD support, also fixed copyright.
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* 11-14-89 JCR Fixed bug -- returned address was off by HDRSIZE
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* 12-18-89 GJF Removed DEBUG286 stuff, also some tuning, cleaned up
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* format a bit, changed header file name to heap.h, added
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* explicit _cdecl to function definition
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* 12-20-89 GJF Removed references to plastdesc
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* 03-11-90 GJF Replaced _cdecl with _CALLTYPE1, added #include
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* <cruntime.h> and removed #include <register.h>.
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* 09-28-90 GJF New-style function declarator.
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* 06-27-94 SRW Ported to Win32 Heap API
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <oscalls.h>
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#include <malloc.h>
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#include <os2dll.h>
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#include <stddef.h>
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#ifndef _POSIX_
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/***
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*int _heapwalk() - Walk the heap
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*
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*Purpose:
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* Walk the heap returning information on one entry at a time.
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*
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*Entry:
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* struct _heapinfo {
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* int * _pentry; heap entry pointer
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* size_t size; size of heap entry
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* int _useflag; free/inuse flag
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* } *entry;
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*
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*Exit:
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* Returns one of the following values:
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*
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* _HEAPOK - completed okay
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* _HEAPEMPTY - heap not initialized
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* _HEAPBADPTR - _pentry pointer is bogus
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* _HEAPBADBEGIN - can't find initial header info
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* _HEAPBADNODE - malformed node somewhere
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* _HEAPEND - end of heap successfully reached
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*
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*Uses:
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*
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*Exceptions:
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*
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*******************************************************************************/
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int _CALLTYPE1 _heapwalk (
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struct _heapinfo *_entry
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)
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{
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PROCESS_HEAP_ENTRY Entry;
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int retval = _HEAPOK;
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Entry.wFlags = 0;
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Entry.iRegionIndex = 0;
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if ((Entry.lpData = _entry->_pentry) == NULL) {
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if (!HeapWalk( GetProcessHeap(), &Entry )) {
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return _HEAPBADBEGIN;
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}
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}
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else {
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if (_entry->_useflag == _USEDENTRY) {
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Entry.wFlags = PROCESS_HEAP_ENTRY_BUSY;
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}
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nextBlock:
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if (!HeapWalk( GetProcessHeap(), &Entry )) {
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return _HEAPBADNODE;
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}
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}
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if (Entry.wFlags & (PROCESS_HEAP_REGION | PROCESS_HEAP_UNCOMMITTED_RANGE)) {
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goto nextBlock;
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}
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_entry->_pentry = Entry.lpData;
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_entry->_size = Entry.cbData;
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if (Entry.wFlags & PROCESS_HEAP_ENTRY_BUSY) {
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_entry->_useflag = _USEDENTRY;
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}
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else {
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_entry->_useflag = _FREEENTRY;
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}
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return(retval);
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}
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#endif /* !_POSIX_ */
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