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