1 /* xmalloc.c -- malloc with out of memory checking
3 Copyright (C) 1990-2000, 2002-2006, 2008-2011 Free Software Foundation, Inc.
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.
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.
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/>. */
21 # define static_inline
29 /* 1 if calloc is known to be compatible with GNU calloc. This
30 matters if we are not also using the calloc module, which defines
31 HAVE_CALLOC_GNU and supports the GNU API even on non-GNU platforms. */
32 #if defined HAVE_CALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__)
33 enum { HAVE_GNU_CALLOC = 1 };
35 enum { HAVE_GNU_CALLOC = 0 };
38 /* Allocate N bytes of memory dynamically, with error checking. */
49 /* Change the size of an allocated block of memory P to N bytes,
50 with error checking. */
53 xrealloc (void *p, size_t n)
61 /* If P is null, allocate a block of at least *PN bytes; otherwise,
62 reallocate P so that it contains more than *PN bytes. *PN must be
63 nonzero unless P is null. Set *PN to the new block's size, and
64 return the pointer to the new block. *PN is never set to zero, and
65 the returned pointer is never null. */
68 x2realloc (void *p, size_t *pn)
70 return x2nrealloc (p, pn, 1);
73 /* Allocate S bytes of zeroed memory dynamically, with error checking.
74 There's no need for xnzalloc (N, S), since it would be equivalent
80 return memset (xmalloc (s), 0, s);
83 /* Allocate zeroed memory for N elements of S bytes, with error
84 checking. S must be nonzero. */
87 xcalloc (size_t n, size_t s)
90 /* Test for overflow, since some calloc implementations don't have
91 proper overflow checks. But omit overflow and size-zero tests if
92 HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
93 returns NULL if successful. */
94 if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
95 || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
100 /* Clone an object P of size S, with error checking. There's no need
101 for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
102 need for an arithmetic overflow check. */
105 xmemdup (void const *p, size_t s)
107 return memcpy (xmalloc (s), p, s);
113 xstrdup (char const *string)
115 return xmemdup (string, strlen (string) + 1);