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[mLib] / arena.c
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34f655c1 1/* -*-c-*-
2 *
8656dc50 3 * $Id: arena.c,v 1.5 2004/04/08 01:36:11 mdw Exp $
34f655c1 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
34f655c1 30/*----- Header files ------------------------------------------------------*/
31
32#include <stdlib.h>
c6250df0 33#include <string.h>
34f655c1 34
35#include "arena.h"
36
37/*----- The standard arena ------------------------------------------------*/
38
39static void *_alloc(arena *a, size_t sz) { return malloc(sz); }
b5ea4de3 40static void *_realloc(arena *a, void *p, size_t sz, size_t osz)
41 { return realloc(p, sz); }
ad505843 42static void _free(arena *a, void *p) { free(p); }
34f655c1 43
44static arena_ops stdlib_ops = { _alloc, _realloc, _free, 0 };
45arena arena_stdlib = { &stdlib_ops };
46
47/*----- Global variables --------------------------------------------------*/
48
49arena *arena_global = &arena_stdlib;
50
51/*----- Main code ---------------------------------------------------------*/
52
53/* --- @arena_fakerealloc@ --- *
54 *
55 * Arguments: @arena *a@ = pointer to arena block
56 * @void *p@ = pointer to memory block to resize
57 * @size_t sz@ = size desired for the block
b5ea4de3 58 * @size_t osz@ = size of the old block
34f655c1 59 *
60 * Returns: ---
61 *
62 * Use: Standard fake @realloc@ function, for use if you don't
63 * support @realloc@ properly.
64 */
65
b5ea4de3 66void *arena_fakerealloc(arena *a, void *p, size_t sz, size_t osz)
34f655c1 67{
68 void *q = A_ALLOC(a, sz);
69 if (!q)
70 return (0);
b5ea4de3 71 memcpy(q, p, sz > osz ? osz : sz);
34f655c1 72 A_FREE(a, p);
73 return (q);
74}
75
76/* --- Function equivalents of the macros --- */
77
78void *a_alloc(arena *a, size_t sz) { return (A_ALLOC(a, sz)); }
b5ea4de3 79void *a_realloc(arena *a, void *p, size_t sz, size_t osz)
80{ return A_REALLOC(a, p, sz, osz); }
34f655c1 81void a_free(arena *a, void *p) { A_FREE(a, p); }
82
83/*----- That's all, folks -------------------------------------------------*/