07c3495e2d656ea7df77a5325e97ae3b3e8edd9a
[disorder] / lib / mem.c
1 /*
2 * This file is part of DisOrder.
3 * Copyright (C) 2004, 2005, 2006 Richard Kettlewell
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21 #include <config.h>
22 #include "types.h"
23
24 #include <gc.h>
25 #include <errno.h>
26 #include <string.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29
30 #include "mem.h"
31 #include "log.h"
32 #include "printf.h"
33
34 #include "disorder.h"
35
36 static void *(*do_malloc)(size_t) = GC_malloc;
37 static void *(*do_realloc)(void *, size_t) = GC_realloc;
38 static void *(*do_malloc_atomic)(size_t) = GC_malloc_atomic;
39 static void (*do_free)(void *) = GC_free;
40
41 static void *malloc_and_zero(size_t n) {
42 void *ptr = malloc(n);
43
44 if(ptr) memset(ptr, 0, n);
45 return ptr;
46 }
47
48 void mem_init(int gc) {
49 const char *e;
50
51 if(!gc || ((e = getenv("DISORDER_GC")) && !strcmp(e, "no"))) {
52 do_malloc = malloc_and_zero;
53 do_malloc_atomic = malloc;
54 do_realloc = realloc;
55 do_free = free;
56 } else
57 GC_init();
58 }
59
60 void *xmalloc(size_t n) {
61 void *ptr;
62
63 if(!(ptr = do_malloc(n)) && n)
64 fatal(errno, "error allocating memory");
65 return ptr;
66 }
67
68 void *xrealloc(void *ptr, size_t n) {
69 if(!(ptr = do_realloc(ptr, n)) && n)
70 fatal(errno, "error allocating memory");
71 return ptr;
72 }
73
74 void *xcalloc(size_t count, size_t size) {
75 if(count > SIZE_MAX / size)
76 fatal(0, "excessively large calloc");
77 return xmalloc(count * size);
78 }
79
80 void *xmalloc_noptr(size_t n) {
81 void *ptr;
82
83 if(!(ptr = do_malloc_atomic(n)) && n)
84 fatal(errno, "error allocating memory");
85 return ptr;
86 }
87
88 void *xrealloc_noptr(void *ptr, size_t n) {
89 if(ptr == 0)
90 return xmalloc_noptr(n);
91 if(!(ptr = do_realloc(ptr, n)) && n)
92 fatal(errno, "error allocating memory");
93 return ptr;
94 }
95
96 char *xstrdup(const char *s) {
97 char *t;
98
99 if(!(t = do_malloc_atomic(strlen(s) + 1)))
100 fatal(errno, "error allocating memory");
101 return strcpy(t, s);
102 }
103
104 char *xstrndup(const char *s, size_t n) {
105 char *t;
106
107 if(!(t = do_malloc_atomic(n + 1)))
108 fatal(errno, "error allocating memory");
109 memcpy(t, s, n);
110 t[n] = 0;
111 return t;
112 }
113
114 void xfree(void *ptr) {
115 do_free(ptr);
116 }
117
118 /*
119 Local Variables:
120 c-basic-offset:2
121 comment-column:40
122 End:
123 */
124 /* arch-tag:fceaf81fe79b2f4f87c9541774a2b8f2 */