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114 lines
2.7 KiB
114 lines
2.7 KiB
/***
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*findaddr.c - Find a heap entry
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*
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* Copyright (c) 1989-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Defines the _heap_findaddr routine
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*
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*Revision History:
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* 07-06-89 JCR Module created.
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* 07-18-89 JCR Return -1 if nothing in heap
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* 11-13-89 GJF Fixed copyright
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* 12-04-89 GJF Renamed header file (now heap.h). Also, some tuning.
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* 12-18-89 GJF Added explicit _cdecl to function definition
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* 03-09-90 GJF Replaced _cdecl with _CALLTYPE1, added #include
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* <cruntime.h> and removed #include <register.h>.
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* 09-27-90 GJF New-style function declarator.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 05-01-95 GJF Made conditional on WINHEAP.
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*
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*******************************************************************************/
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#ifndef WINHEAP
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#include <cruntime.h>
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#include <heap.h>
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#include <stddef.h>
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#define TRUE 1
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/***
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*int _heap_findaddr() - Find a heap entry
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*
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*Purpose:
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* Given an address, find the corresponding heap entry.
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*
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*Entry:
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* void * address = address to look for
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* PBLKDESC * ppdesc = pointer to pointer to heap descriptor to be
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* filled in by this routine.
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*
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*Exit:
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*
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* _HEAPFIND_EXACT = 0 = exact fit, pdesc holds heap descriptor address
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* _HEAPFIND_WITHIN = 1 = not exact fit, pdesc holds previous heap
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* descriptor address
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*
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* _HEAPFIND_BEFORE = -1 = address is before the heap (pdesc NOT filled in)
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* _HEAPFIND_AFTER = -2 = address is after the heap (pdesc NOT filled in)
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* _HEAPFIND_EMPTY = -3 = no memory in heap (pdesc NOT filled in)
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*
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* [If return is negative, supplied pdesc is NOT filled in.]
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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 __cdecl _heap_findaddr (
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void * address,
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_PBLKDESC * ppdesc
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)
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{
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REG1 _PBLKDESC pcurr;
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/*
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* See if heap there's anything in the heap
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*/
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if (_heap_desc.pfirstdesc == &_heap_desc.sentinel)
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return(_HEAPFIND_EMPTY);
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/*
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* See if entry is in the heap or not
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*/
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if (_ADDRESS(_heap_desc.pfirstdesc) > address)
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return(_HEAPFIND_BEFORE);
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if (_ADDRESS(&_heap_desc.sentinel) <= address)
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return(_HEAPFIND_AFTER);
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/*
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* Find the entry
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*/
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#ifdef DEBUG
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for (pcurr = _heap_desc.pfirstdesc; pcurr != &_heap_desc.sentinel;
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pcurr = pcurr->pnextdesc) {
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#else
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for (pcurr = _heap_desc.pfirstdesc; TRUE; pcurr = pcurr->pnextdesc) {
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#endif
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if ( _ADDRESS(pcurr->pnextdesc) > address ) {
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/* Address is contained in this entry */
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*ppdesc = pcurr;
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/* Check for an exact fit */
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if ( _ADDRESS(pcurr) == address)
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return(_HEAPFIND_EXACT);
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else
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return(_HEAPFIND_WITHIN);
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}
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}
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#ifdef DEBUG
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/* Should never reach here! */
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_heap_abort();
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#endif
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}
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#endif /* WINHEAP */
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