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Basic arena management.
[mLib] / arena.c
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34f655c1 1/* -*-c-*-
2 *
3 * $Id: arena.c,v 1.1 2000/06/17 10:37:53 mdw Exp $
4 *
5 * Abstraction for memory allocation arenas
6 *
7 * (c) 2000 Straylight/Edgeware
8 */
9
10/*----- Licensing notice --------------------------------------------------*
11 *
12 * This file is part of the mLib utilities library.
13 *
14 * mLib is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
18 *
19 * mLib is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
23 *
24 * You should have received a copy of the GNU Library General Public
25 * License along with mLib; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
27 * MA 02111-1307, USA.
28 */
29
30/*----- Revision history --------------------------------------------------*
31 *
32 * $Log: arena.c,v $
33 * Revision 1.1 2000/06/17 10:37:53 mdw
34 * Basic arena management.
35 *
36 */
37
38/*----- Header files ------------------------------------------------------*/
39
40#include <stdlib.h>
41
42#include "arena.h"
43
44/*----- The standard arena ------------------------------------------------*/
45
46static void *_alloc(arena *a, size_t sz) { return malloc(sz); }
47static void *_realloc(arena *a, void *p, size_t sz){ return realloc(p, sz); }
48static void _free(arena *a, void *p) { free (p); }
49
50static arena_ops stdlib_ops = { _alloc, _realloc, _free, 0 };
51arena arena_stdlib = { &stdlib_ops };
52
53/*----- Global variables --------------------------------------------------*/
54
55arena *arena_global = &arena_stdlib;
56
57/*----- Main code ---------------------------------------------------------*/
58
59/* --- @arena_fakerealloc@ --- *
60 *
61 * Arguments: @arena *a@ = pointer to arena block
62 * @void *p@ = pointer to memory block to resize
63 * @size_t sz@ = size desired for the block
64 *
65 * Returns: ---
66 *
67 * Use: Standard fake @realloc@ function, for use if you don't
68 * support @realloc@ properly.
69 */
70
71void *arena_fakerealloc(arena *a, void *p, size_t sz)
72{
73 void *q = A_ALLOC(a, sz);
74 if (!q)
75 return (0);
76 memcpy(q, p, sz);
77 A_FREE(a, p);
78 return (q);
79}
80
81/* --- Function equivalents of the macros --- */
82
83void *a_alloc(arena *a, size_t sz) { return (A_ALLOC(a, sz)); }
84void *a_realloc(arena *a, void *p, size_t sz) { return A_REALLOC(a, p, sz); }
85void a_free(arena *a, void *p) { A_FREE(a, p); }
86
87/*----- That's all, folks -------------------------------------------------*/