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/* xmalloc.c -- malloc with out of memory checking
Copyright (C) 1990-1996, 2000-2003, 2005-2007, 2012, 2015-2016 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>
/* Specification. */
#include "xalloc.h"
#include <stdlib.h>
#include "error.h"
#include "gettext.h"
#define _(str) gettext (str)
/* Exit value when the requested amount of memory is not available.
The caller may set it to some other value. */
int xmalloc_exit_failure = EXIT_FAILURE;
void
xalloc_die ()
{
error (xmalloc_exit_failure, 0, _("memory exhausted"));
/* _Noreturn cannot be given to error, since it may return if
its first argument is 0. To help compilers understand the
xalloc_die does terminate, call exit. */
exit (EXIT_FAILURE);
}
static void *
fixup_null_alloc (size_t n)
{
void *p;
p = NULL;
if (n == 0)
p = malloc ((size_t) 1);
if (p == NULL)
xalloc_die ();
return p;
}
/* Allocate N bytes of memory dynamically, with error checking. */
void *
xmalloc (size_t n)
{
void *p;
p = malloc (n);
if (p == NULL)
p = fixup_null_alloc (n);
return p;
}
/* Allocate memory for NMEMB elements of SIZE bytes, with error checking.
SIZE must be > 0. */
void *
xnmalloc (size_t nmemb, size_t size)
{
size_t n;
void *p;
if (xalloc_oversized (nmemb, size))
xalloc_die ();
n = nmemb * size;
p = malloc (n);
if (p == NULL)
p = fixup_null_alloc (n);
return p;
}
/* Allocate SIZE bytes of memory dynamically, with error checking,
and zero it. */
void *
xzalloc (size_t size)
{
void *p;
p = xmalloc (size);
memset (p, 0, size);
return p;
}
/* Allocate memory for N elements of S bytes, with error checking,
and zero it. */
void *
xcalloc (size_t n, size_t s)
{
void *p;
p = calloc (n, s);
if (p == NULL)
p = fixup_null_alloc (n);
return p;
}
/* Change the size of an allocated block of memory P to N bytes,
with error checking.
If P is NULL, run xmalloc. */
void *
xrealloc (void *p, size_t n)
{
if (p == NULL)
return xmalloc (n);
p = realloc (p, n);
if (p == NULL)
p = fixup_null_alloc (n);
return p;
}
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