123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/* xmalloc.c -- malloc with out of memory checking
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Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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1999, 2000, 2002, 2003, 2004, 2005, 2006 Free Software Foundation,
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Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#if ! HAVE_INLINE
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# define static_inline
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#endif
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#include "xalloc.h"
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#undef static_inline
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#include <stdlib.h>
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#include <string.h>
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#ifndef SIZE_MAX
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# define SIZE_MAX ((size_t) -1)
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#endif
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/* 1 if calloc is known to be compatible with GNU calloc. This
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matters if we are not also using the calloc module, which defines
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HAVE_CALLOC and supports the GNU API even on non-GNU platforms. */
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#if defined HAVE_CALLOC || defined __GLIBC__
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enum { HAVE_GNU_CALLOC = 1 };
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#else
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enum { HAVE_GNU_CALLOC = 0 };
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#endif
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/* Allocate N bytes of memory dynamically, with error checking. */
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void *
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xmalloc (size_t n)
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{
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void *p = malloc (n);
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if (!p && n != 0)
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xalloc_die ();
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return p;
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}
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/* Change the size of an allocated block of memory P to N bytes,
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with error checking. */
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void *
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xrealloc (void *p, size_t n)
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{
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p = realloc (p, n);
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if (!p && n != 0)
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xalloc_die ();
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return p;
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}
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/* If P is null, allocate a block of at least *PN bytes; otherwise,
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reallocate P so that it contains more than *PN bytes. *PN must be
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nonzero unless P is null. Set *PN to the new block's size, and
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return the pointer to the new block. *PN is never set to zero, and
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the returned pointer is never null. */
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void *
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x2realloc (void *p, size_t *pn)
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{
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return x2nrealloc (p, pn, 1);
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}
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/* Allocate S bytes of zeroed memory dynamically, with error checking.
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There's no need for xnzalloc (N, S), since it would be equivalent
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to xcalloc (N, S). */
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void *
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xzalloc (size_t s)
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{
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return memset (xmalloc (s), 0, s);
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}
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/* Allocate zeroed memory for N elements of S bytes, with error
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checking. S must be nonzero. */
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void *
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xcalloc (size_t n, size_t s)
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{
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void *p;
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/* Test for overflow, since some calloc implementations don't have
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proper overflow checks. But omit overflow and size-zero tests if
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HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
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returns NULL if successful. */
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if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
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|| (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
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xalloc_die ();
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return p;
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}
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/* Clone an object P of size S, with error checking. There's no need
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for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
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need for an arithmetic overflow check. */
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void *
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xmemdup (void const *p, size_t s)
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{
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return memcpy (xmalloc (s), p, s);
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}
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/* Clone STRING. */
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char *
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xstrdup (char const *string)
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{
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return xmemdup (string, strlen (string) + 1);
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}
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