1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#if defined(_UWIN) && defined(_BLD_ast)
23
24void _STUB_vmdcheap(){}
25
26#else
27
28#include	"vmhdr.h"
29
30/*	A discipline to get memory from the heap.
31**
32**	Written by Kiem-Phong Vo, kpv@research.att.com, 01/16/94.
33*/
34#if __STD_C
35static Void_t* heapmem(Vmalloc_t* vm, Void_t* caddr,
36			size_t csize, size_t nsize,
37			Vmdisc_t* disc)
38#else
39static Void_t* heapmem(vm, caddr, csize, nsize, disc)
40Vmalloc_t*	vm;	/* region doing allocation from 	*/
41Void_t*		caddr;	/* current low address			*/
42size_t		csize;	/* current size				*/
43size_t		nsize;	/* new size				*/
44Vmdisc_t*	disc;	/* discipline structure			*/
45#endif
46{
47	NOTUSED(vm);
48	NOTUSED(disc);
49
50	if(csize == 0)
51		return vmalloc(Vmheap,nsize);
52	else if(nsize == 0)
53		return vmfree(Vmheap,caddr) >= 0 ? caddr : NIL(Void_t*);
54	else	return vmresize(Vmheap,caddr,nsize,0);
55}
56
57static Vmdisc_t _Vmdcheap = { heapmem, NIL(Vmexcept_f), 0 };
58__DEFINE__(Vmdisc_t*,Vmdcheap,&_Vmdcheap);
59
60#ifdef NoF
61NoF(vmdcheap)
62#endif
63
64#endif
65