/* xmalloc.c -- malloc with out of memory checking
   Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 97 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>
#include <stdio.h>
#include <string.h>

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

#include "gettext.h"
#include "xalloc.h"

#ifndef EXIT_FAILURE
# define EXIT_FAILURE 1
#endif

/* Prototypes for functions defined here.  */
#if defined (__STDC__) && __STDC__
void *xmalloc (size_t n);
void *xcalloc (size_t n, size_t s);
void *xrealloc (void *p, size_t n);
#endif

/* Exit value when the requested amount of memory is not available.
   The caller may set it to some other value.  */
int xalloc_exit_failure = EXIT_FAILURE;

/* FIXME: describe */
char *const xalloc_msg_memory_exhausted = N_("Memory exhausted");

/* FIXME: describe */
void (*xalloc_fail_func) (int) = 0;

static void
xalloc_fail (int size)
{
  if (xalloc_fail_func)
    (*xalloc_fail_func) (size);
  fprintf(stderr, "%s\n", xalloc_msg_memory_exhausted);
  exit(xalloc_exit_failure);
}

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

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

  p = malloc (n);
  if (p == 0)
    xalloc_fail ((int)n);
  return p;
}

/* Allocate N bytes of memory dynamically, and set it all to zero. */

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

  p = malloc (n);
  if (p == 0)
    xalloc_fail ((int)n);
  memset (p, '\0', 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 (p, n)
     void *p;
     size_t n;
{
  p = realloc (p, n);
  if (p == 0)
    xalloc_fail (n);
  return p;
}

/* Duplicate a string */

char *xstrdup(const char *s)
{
  char *p;
  
  p = strdup(s);
  if(!p)
    xalloc_fail ((int)strlen(s));
  return p;
}

#ifdef NOT_USED

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

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

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

#endif /* NOT_USED */