usr/src/lib/libast/common/vmalloc/vmgetmem.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 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
  24 void _STUB_vmgetmem(){}
  25
  26 #else
  27
  28 #include        "vmhdr.h"
  29
  30 /*
  31  * vm open/close/resize - a handy default for discipline memory functions
  32  *
  33  *      vmgetmem(0,0,0)         open new region
  34  *      vmgetmem(r,0,0)         free region
  35  *      vmgetmem(r,0,n)         allocate n bytes initialized to 0
  36  *      vmgetmem(r,p,0)         free p
  37  *      vmgetmem(r,p,n)         realloc p to n bytes
  38  *
  39  * Written by Glenn S. Fowler.
  40  */
  41
  42 #if __STD_C
  43 Void_t* vmgetmem(Vmalloc_t* vm, Void_t* data, size_t size)
  44 #else
  45 Void_t* vmgetmem(vm, data, size)
  46 Vmalloc_t*      vm;
  47 Void_t*         data;
  48 size_t          size;
  49 #endif
  50 {
  51         if (!vm)
  52                 return vmopen(Vmdcheap, Vmbest, 0);
  53         if (data || size)
  54                 return vmresize(vm, data, size, VM_RSMOVE|VM_RSCOPY|VM_RSZERO);
  55         vmclose(vm);
  56         return 0;
  57 }
  58
  59 #endif