coreutils/lib/xmalloc.c

/* xmalloc.c -- malloc with out of memory checking

   Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   1999, 2000, 2002, 2003 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 2, 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, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#if HAVE_CONFIG_H
# include <config.h>
#endif

#include <sys/types.h>

#if STDC_HEADERS
# include <stdlib.h>
#else
void *calloc ();
void *malloc ();
void *realloc ();
void free ();
#endif

#include "gettext.h"
#define _(msgid) gettext (msgid)
#define N_(msgid) msgid

#include "error.h"
#include "exitfail.h"
#include "xalloc.h"

#ifndef EXIT_FAILURE
# define EXIT_FAILURE 1
#endif

/* The following tests require AC_PREREQ(2.54).  */

#ifndef HAVE_MALLOC
"you must run the autoconf test for a GNU libc compatible malloc"
#endif

#ifndef HAVE_REALLOC
"you must run the autoconf test for a GNU libc compatible realloc"
#endif

/* If non NULL, call this function when memory is exhausted. */
void (*xalloc_fail_func) (void) = 0;

/* If XALLOC_FAIL_FUNC is NULL, or does return, display this message
   before exiting when memory is exhausted.  Goes through gettext. */
char const xalloc_msg_memory_exhausted[] = N_("memory exhausted");

void
xalloc_die (void)
{
  if (xalloc_fail_func)
    (*xalloc_fail_func) ();
  error (exit_failure, 0, "%s", _(xalloc_msg_memory_exhausted));
  /* The `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);
}

/* Allocate N bytes of memory dynamically, with error checking.  */

void *
xmalloc (size_t n)
{
  void *p;

  p = malloc (n);
  if (p == 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 == 0)
    xalloc_die ();
  return p;
}

/* Allocate memory for N elements of S bytes, with error checking.  */

void *
xcalloc (size_t n, size_t s)
{
  void *p;

  p = calloc (n, s);
  if (p == 0)
    xalloc_die ();
  return p;
}