/*******************************************************************
*                                                                  *
*             This software is part of the ast package             *
*                Copyright (c) 1985-2004 AT&T Corp.                *
*        and it may only be used by you under license from         *
*                       AT&T Corp. ("AT&T")                        *
*         A copy of the Source Code Agreement is available         *
*                at the AT&T Internet web site URL                 *
*                                                                  *
*       http://www.research.att.com/sw/license/ast-open.html       *
*                                                                  *
*    If you have copied or used this software without agreeing     *
*        to the terms of the license you are infringing on         *
*           the license and copyright and are violating            *
*               AT&T's intellectual property rights.               *
*                                                                  *
*            Information and Software Systems Research             *
*                        AT&T Labs Research                        *
*                         Florham Park NJ                          *
*                                                                  *
*               Glenn Fowler <gsf@research.att.com>                *
*                David Korn <dgk@research.att.com>                 *
*                 Phong Vo <kpv@research.att.com>                  *
*                                                                  *
*******************************************************************/
#if defined(_UWIN) && defined(_BLD_ast)

void _STUB_vmdcheap(){}

#else

#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);

#ifdef NoF
NoF(vmdcheap)
#endif

#endif
