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/* $Id: vmdcheap.c,v 1.3 2009/06/03 01:10:55 ellson Exp $ $Revision: 1.3 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
#include "vmhdr.h"
/* A discipline to get memory from the heap.
**
** Written by Kiem-Phong Vo, kpv@research.att.com, 01/16/94.
*/
#if __STD_C
static Void_t *heapmem(Vmalloc_t * vm, Void_t * caddr,
size_t csize, size_t nsize, Vmdisc_t * disc)
#else
static Void_t *heapmem(vm, caddr, csize, nsize, disc)
Vmalloc_t *vm; /* region doing allocation from */
Void_t *caddr; /* current low address */
size_t csize; /* current size */
size_t nsize; /* new size */
Vmdisc_t *disc; /* discipline structure */
#endif
{
NOTUSED(vm);
NOTUSED(disc);
if (csize == 0)
return vmalloc(Vmheap, nsize);
else if (nsize == 0)
return vmfree(Vmheap, caddr) >= 0 ? caddr : NIL(Void_t *);
else
return vmresize(Vmheap, caddr, nsize, 0);
}
static Vmdisc_t _Vmdcheap = { heapmem, NIL(Vmexcept_f), 0 };
__DEFINE__(Vmdisc_t *, Vmdcheap, &_Vmdcheap);
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