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-rw-r--r--gl/xmalloc.c123
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1/* xmalloc.c -- malloc with out of memory checking
2
3 Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4 1999, 2000, 2002, 2003, 2004, 2005, 2006 Free Software Foundation,
5 Inc.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
10 any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software Foundation,
19 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
20
21#include <config.h>
22
23#if ! HAVE_INLINE
24# define static_inline
25#endif
26#include "xalloc.h"
27#undef static_inline
28
29#include <stdlib.h>
30#include <string.h>
31
32#ifndef SIZE_MAX
33# define SIZE_MAX ((size_t) -1)
34#endif
35
36/* 1 if calloc is known to be compatible with GNU calloc. This
37 matters if we are not also using the calloc module, which defines
38 HAVE_CALLOC and supports the GNU API even on non-GNU platforms. */
39#if defined HAVE_CALLOC || defined __GLIBC__
40enum { HAVE_GNU_CALLOC = 1 };
41#else
42enum { HAVE_GNU_CALLOC = 0 };
43#endif
44
45/* Allocate N bytes of memory dynamically, with error checking. */
46
47void *
48xmalloc (size_t n)
49{
50 void *p = malloc (n);
51 if (!p && n != 0)
52 xalloc_die ();
53 return p;
54}
55
56/* Change the size of an allocated block of memory P to N bytes,
57 with error checking. */
58
59void *
60xrealloc (void *p, size_t n)
61{
62 p = realloc (p, n);
63 if (!p && n != 0)
64 xalloc_die ();
65 return p;
66}
67
68/* If P is null, allocate a block of at least *PN bytes; otherwise,
69 reallocate P so that it contains more than *PN bytes. *PN must be
70 nonzero unless P is null. Set *PN to the new block's size, and
71 return the pointer to the new block. *PN is never set to zero, and
72 the returned pointer is never null. */
73
74void *
75x2realloc (void *p, size_t *pn)
76{
77 return x2nrealloc (p, pn, 1);
78}
79
80/* Allocate S bytes of zeroed memory dynamically, with error checking.
81 There's no need for xnzalloc (N, S), since it would be equivalent
82 to xcalloc (N, S). */
83
84void *
85xzalloc (size_t s)
86{
87 return memset (xmalloc (s), 0, s);
88}
89
90/* Allocate zeroed memory for N elements of S bytes, with error
91 checking. S must be nonzero. */
92
93void *
94xcalloc (size_t n, size_t s)
95{
96 void *p;
97 /* Test for overflow, since some calloc implementations don't have
98 proper overflow checks. But omit overflow and size-zero tests if
99 HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
100 returns NULL if successful. */
101 if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
102 || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
103 xalloc_die ();
104 return p;
105}
106
107/* Clone an object P of size S, with error checking. There's no need
108 for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
109 need for an arithmetic overflow check. */
110
111void *
112xmemdup (void const *p, size_t s)
113{
114 return memcpy (xmalloc (s), p, s);
115}
116
117/* Clone STRING. */
118
119char *
120xstrdup (char const *string)
121{
122 return xmemdup (string, strlen (string) + 1);
123}