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

   Copyright (C) 1990-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   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; version 2 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/>.  */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#define VOID void

#include <sys/types.h>

#if STDC_HEADERS || _LIBC

#include <stdlib.h>

static VOID *fixup_null_alloc (size_t n) __THROW;

VOID *xmalloc (size_t n) __THROW;

VOID *xcalloc (size_t n, size_t s) __THROW;

VOID *xrealloc (VOID *p, size_t n) __THROW;

#else

VOID *calloc ();

VOID *malloc ();

VOID *realloc ();

void free ();

#endif

#include <libintl.h>

#include "error.h"

#ifndef _

# define _(str) gettext (str)

#endif

#ifndef EXIT_FAILURE

#define EXIT_FAILURE 4

#endif

/* 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;

static VOID *

fixup_null_alloc (size_t n)

{

  VOID *p;

  p = 0;

  if (n == 0)

    p = malloc ((size_t) 1);

  if (p == 0)

    error (xmalloc_exit_failure, 0, _("memory exhausted"));

  return p;

}

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

VOID *

xmalloc (size_t n)

{

  VOID *p;

  p = malloc (n);

  if (p == 0)

    p = fixup_null_alloc (n);

  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)

    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 == 0)

    return xmalloc (n);

  p = realloc (p, n);

  if (p == 0)

    p = fixup_null_alloc (n);

  return p;

}