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1/* -*-c-*-
2 *
3 * $Id: arena.c,v 1.4 2001/06/22 19:32:59 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 1.4 2001/06/22 19:32:59 mdw
34 * Remove a space.
35 *
36 * Revision 1.3 2000/08/06 11:00:18 mdw
37 * Daft bug fix. Include <string.h>.
38 *
39 * Revision 1.2 2000/07/16 12:29:16 mdw
40 * Change to arena `realloc' interface, to fix a design bug.
41 *
42 * Revision 1.1 2000/06/17 10:37:53 mdw
43 * Basic arena management.
44 *
45 */
46
47/*----- Header files ------------------------------------------------------*/
48
49#include <stdlib.h>
50#include <string.h>
51
52#include "arena.h"
53
54/*----- The standard arena ------------------------------------------------*/
55
56static void *_alloc(arena *a, size_t sz) { return malloc(sz); }
57static void *_realloc(arena *a, void *p, size_t sz, size_t osz)
58 { return realloc(p, sz); }
59static void _free(arena *a, void *p) { free(p); }
60
61static arena_ops stdlib_ops = { _alloc, _realloc, _free, 0 };
62arena arena_stdlib = { &stdlib_ops };
63
64/*----- Global variables --------------------------------------------------*/
65
66arena *arena_global = &arena_stdlib;
67
68/*----- Main code ---------------------------------------------------------*/
69
70/* --- @arena_fakerealloc@ --- *
71 *
72 * Arguments: @arena *a@ = pointer to arena block
73 * @void *p@ = pointer to memory block to resize
74 * @size_t sz@ = size desired for the block
75 * @size_t osz@ = size of the old block
76 *
77 * Returns: ---
78 *
79 * Use: Standard fake @realloc@ function, for use if you don't
80 * support @realloc@ properly.
81 */
82
83void *arena_fakerealloc(arena *a, void *p, size_t sz, size_t osz)
84{
85 void *q = A_ALLOC(a, sz);
86 if (!q)
87 return (0);
88 memcpy(q, p, sz > osz ? osz : sz);
89 A_FREE(a, p);
90 return (q);
91}
92
93/* --- Function equivalents of the macros --- */
94
95void *a_alloc(arena *a, size_t sz) { return (A_ALLOC(a, sz)); }
96void *a_realloc(arena *a, void *p, size_t sz, size_t osz)
97{ return A_REALLOC(a, p, sz, osz); }
98void a_free(arena *a, void *p) { A_FREE(a, p); }
99
100/*----- That's all, folks -------------------------------------------------*/