3 * $Id: arena.c,v 1.3 2000/08/06 11:00:18 mdw Exp $
5 * Abstraction for memory allocation arenas
7 * (c) 2000 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the mLib utilities library.
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.
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.
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,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.3 2000/08/06 11:00:18 mdw
34 * Daft bug fix. Include <string.h>.
36 * Revision 1.2 2000/07/16 12:29:16 mdw
37 * Change to arena `realloc' interface, to fix a design bug.
39 * Revision 1.1 2000/06/17 10:37:53 mdw
40 * Basic arena management.
44 /*----- Header files ------------------------------------------------------*/
51 /*----- The standard arena ------------------------------------------------*/
53 static void *_alloc(arena *a, size_t sz) { return malloc(sz); }
54 static void *_realloc(arena *a, void *p, size_t sz, size_t osz)
55 { return realloc(p, sz); }
56 static void _free(arena *a, void *p) { free (p); }
58 static arena_ops stdlib_ops = { _alloc, _realloc, _free, 0 };
59 arena arena_stdlib = { &stdlib_ops };
61 /*----- Global variables --------------------------------------------------*/
63 arena *arena_global = &arena_stdlib;
65 /*----- Main code ---------------------------------------------------------*/
67 /* --- @arena_fakerealloc@ --- *
69 * Arguments: @arena *a@ = pointer to arena block
70 * @void *p@ = pointer to memory block to resize
71 * @size_t sz@ = size desired for the block
72 * @size_t osz@ = size of the old block
76 * Use: Standard fake @realloc@ function, for use if you don't
77 * support @realloc@ properly.
80 void *arena_fakerealloc(arena *a, void *p, size_t sz, size_t osz)
82 void *q = A_ALLOC(a, sz);
85 memcpy(q, p, sz > osz ? osz : sz);
90 /* --- Function equivalents of the macros --- */
92 void *a_alloc(arena *a, size_t sz) { return (A_ALLOC(a, sz)); }
93 void *a_realloc(arena *a, void *p, size_t sz, size_t osz)
94 { return A_REALLOC(a, p, sz, osz); }
95 void a_free(arena *a, void *p) { A_FREE(a, p); }
97 /*----- That's all, folks -------------------------------------------------*/