Line data Source code
1 : /* xmalloc.c -- malloc with out of memory checking
2 :
3 : Copyright (C) 1990-2000, 2002-2006, 2008-2016 Free Software Foundation, Inc.
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 3 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,
11 : but WITHOUT ANY WARRANTY; without even the implied warranty of
12 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 : GNU 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, see <http://www.gnu.org/licenses/>. */
17 :
18 : #include <config.h>
19 :
20 : #define XALLOC_INLINE _GL_EXTERN_INLINE
21 :
22 : #include "xalloc.h"
23 :
24 : #include <stdlib.h>
25 : #include <string.h>
26 :
27 : /* 1 if calloc is known to be compatible with GNU calloc. This
28 : matters if we are not also using the calloc module, which defines
29 : HAVE_CALLOC_GNU and supports the GNU API even on non-GNU platforms. */
30 : #if defined HAVE_CALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__)
31 : enum { HAVE_GNU_CALLOC = 1 };
32 : #else
33 : enum { HAVE_GNU_CALLOC = 0 };
34 : #endif
35 :
36 : /* Allocate N bytes of memory dynamically, with error checking. */
37 :
38 : void *
39 0 : xmalloc (size_t n)
40 : {
41 0 : void *p = malloc (n);
42 0 : if (!p && n != 0)
43 0 : xalloc_die ();
44 0 : return p;
45 : }
46 :
47 : /* Change the size of an allocated block of memory P to N bytes,
48 : with error checking. */
49 :
50 : void *
51 0 : xrealloc (void *p, size_t n)
52 : {
53 0 : if (!n && p)
54 : {
55 : /* The GNU and C99 realloc behaviors disagree here. Act like
56 : GNU, even if the underlying realloc is C99. */
57 0 : free (p);
58 0 : return NULL;
59 : }
60 :
61 0 : p = realloc (p, n);
62 0 : if (!p && n)
63 0 : xalloc_die ();
64 0 : return p;
65 : }
66 :
67 : /* If P is null, allocate a block of at least *PN bytes; otherwise,
68 : reallocate P so that it contains more than *PN bytes. *PN must be
69 : nonzero unless P is null. Set *PN to the new block's size, and
70 : return the pointer to the new block. *PN is never set to zero, and
71 : the returned pointer is never null. */
72 :
73 : void *
74 0 : x2realloc (void *p, size_t *pn)
75 : {
76 0 : return x2nrealloc (p, pn, 1);
77 : }
78 :
79 : /* Allocate S bytes of zeroed memory dynamically, with error checking.
80 : There's no need for xnzalloc (N, S), since it would be equivalent
81 : to xcalloc (N, S). */
82 :
83 : void *
84 0 : xzalloc (size_t s)
85 : {
86 0 : return memset (xmalloc (s), 0, s);
87 : }
88 :
89 : /* Allocate zeroed memory for N elements of S bytes, with error
90 : checking. S must be nonzero. */
91 :
92 : void *
93 0 : xcalloc (size_t n, size_t s)
94 : {
95 : void *p;
96 : /* Test for overflow, since some calloc implementations don't have
97 : proper overflow checks. But omit overflow and size-zero tests if
98 : HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
99 : returns NULL if successful. */
100 0 : if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
101 : || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
102 0 : xalloc_die ();
103 0 : return p;
104 : }
105 :
106 : /* Clone an object P of size S, with error checking. There's no need
107 : for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
108 : need for an arithmetic overflow check. */
109 :
110 : void *
111 0 : xmemdup (void const *p, size_t s)
112 : {
113 0 : return memcpy (xmalloc (s), p, s);
114 : }
115 :
116 : /* Clone STRING. */
117 :
118 : char *
119 0 : xstrdup (char const *string)
120 : {
121 0 : return xmemdup (string, strlen (string) + 1);
122 : }
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