1/* xmalloc.c -- malloc with out of memory checking
2   Copyright (C) 1990-1997, 98, 99 Free Software Foundation, Inc.
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 2, or (at your option)
7   any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program; if not, write to the Free Software Foundation,
16   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
17
18#if HAVE_CONFIG_H
19# include <config.h>
20#endif
21
22#include <sys/types.h>
23
24#if STDC_HEADERS
25# include <stdlib.h>
26#else
27void *calloc ();
28void *malloc ();
29void *realloc ();
30void free ();
31#endif
32
33#if ENABLE_NLS
34# include <libintl.h>
35# define _(Text) gettext (Text)
36#else
37# define textdomain(Domain)
38# define _(Text) Text
39#endif
40#define N_(Text) Text
41
42#include "error.h"
43#include "xalloc.h"
44
45#ifndef EXIT_FAILURE
46# define EXIT_FAILURE 1
47#endif
48
49#ifndef HAVE_DONE_WORKING_MALLOC_CHECK
50you must run the autoconf test for a properly working malloc -- see malloc.m4
51#endif
52
53#ifndef HAVE_DONE_WORKING_REALLOC_CHECK
54you must run the autoconf test for a properly working realloc -- see realloc.m4
55#endif
56
57/* Exit value when the requested amount of memory is not available.
58   The caller may set it to some other value.  */
59int xalloc_exit_failure = EXIT_FAILURE;
60
61/* If non NULL, call this function when memory is exhausted. */
62void (*xalloc_fail_func) () = 0;
63
64/* If XALLOC_FAIL_FUNC is NULL, or does return, display this message
65   before exiting when memory is exhausted.  Goes through gettext. */
66char *const xalloc_msg_memory_exhausted = N_("Memory exhausted");
67
68static void
69xalloc_fail (void)
70{
71  if (xalloc_fail_func)
72    (*xalloc_fail_func) ();
73  error (xalloc_exit_failure, 0, "%s", _(xalloc_msg_memory_exhausted));
74}
75
76/* Allocate N bytes of memory dynamically, with error checking.  */
77
78void *
79xmalloc (size_t n)
80{
81  void *p;
82
83  p = malloc (n);
84  if (p == 0)
85    xalloc_fail ();
86  return p;
87}
88
89/* Change the size of an allocated block of memory P to N bytes,
90   with error checking.
91   If P is NULL, run xmalloc.  */
92
93void *
94xrealloc (void *p, size_t n)
95{
96  p = realloc (p, n);
97  if (p == 0)
98    xalloc_fail ();
99  return p;
100}
101
102/* Allocate memory for N elements of S bytes, with error checking.  */
103
104void *
105xcalloc (size_t n, size_t s)
106{
107  void *p;
108
109  p = calloc (n, s);
110  if (p == 0)
111    xalloc_fail ();
112  return p;
113}
114