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 * Eclipse Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.eclipse.org/org/documents/epl-v10.html *
11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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
_STUB_vmdcheap()24 void _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
heapmem(Vmalloc_t * vm,Void_t * caddr,size_t csize,size_t nsize,Vmdisc_t * disc)35 static Void_t* heapmem(Vmalloc_t* vm, Void_t* caddr,
36 size_t csize, size_t nsize,
37 Vmdisc_t* disc)
38 #else
39 static Void_t* heapmem(vm, caddr, csize, nsize, disc)
40 Vmalloc_t* vm; /* region doing allocation from */
41 Void_t* caddr; /* current low address */
42 size_t csize; /* current size */
43 size_t nsize; /* new size */
44 Vmdisc_t* disc; /* discipline structure */
45 #endif
46 {
47 if(csize == 0 && nsize == 0)
48 return NIL(Void_t*);
49 else if(csize == 0)
50 return vmalloc(Vmheap,nsize);
51 else if(nsize == 0)
52 return vmfree(Vmheap,caddr) >= 0 ? caddr : NIL(Void_t*);
53 else return vmresize(Vmheap,caddr,nsize,0);
54 }
55
56 static Vmdisc_t _Vmdcheap = { heapmem, NIL(Vmexcept_f), 0 };
57 __DEFINE__(Vmdisc_t*,Vmdcheap,&_Vmdcheap);
58
59 #ifdef NoF
60 NoF(vmdcheap)
61 #endif
62
63 #endif
64