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

   Copyright (C) 1990-1996, 2000-2003, 2005-2007, 2012, 2015 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;

}