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vmdcheap.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                      by AT&T Knowledge Ventures                      *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T 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

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