1/* xmalloc.c -- malloc with out of memory checking
2   Copyright (C) 1990, 91, 92, 93, 94 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
16   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
17
18#ifdef HAVE_CONFIG_H
19#include <config.h>
20#endif
21
22#if __STDC__
23#define VOID void
24#else
25#define VOID char
26#endif
27
28#include <sys/types.h>
29
30#if STDC_HEADERS
31#include <stdlib.h>
32#else
33VOID *calloc ();
34VOID *malloc ();
35VOID *realloc ();
36void free ();
37#endif
38
39//#include <libintl.h>
40
41#define _(str) gettext (str)
42
43#ifndef EXIT_FAILURE
44#define EXIT_FAILURE 4
45#endif
46
47/* Exit value when the requested amount of memory is not available.
48   The caller may set it to some other value.  */
49int xmalloc_exit_failure = EXIT_FAILURE;
50
51#if __STDC__ && (HAVE_VPRINTF || HAVE_DOPRNT)
52void error (int, int, const char *, ...);
53#else
54void error ();
55#endif
56
57static VOID *
58fixup_null_alloc (n)
59     size_t n;
60{
61  VOID *p;
62
63  p = 0;
64  if (n == 0)
65    p = malloc ((size_t) 1);
66  if (p == 0)
67    error (xmalloc_exit_failure, 0, _("memory exhausted"));
68  return p;
69}
70
71/* Allocate N bytes of memory dynamically, with error checking.  */
72
73VOID *
74xmalloc (n)
75     size_t n;
76{
77  VOID *p;
78
79  p = malloc (n);
80  if (p == 0)
81    p = fixup_null_alloc (n);
82  return p;
83}
84
85/* Allocate memory for N elements of S bytes, with error checking.  */
86
87VOID *
88xcalloc (n, s)
89     size_t n, s;
90{
91  VOID *p;
92
93  p = calloc (n, s);
94  if (p == 0)
95    p = fixup_null_alloc (n);
96  return p;
97}
98
99/* Change the size of an allocated block of memory P to N bytes,
100   with error checking.
101   If P is NULL, run xmalloc.  */
102
103VOID *
104xrealloc (p, n)
105     VOID *p;
106     size_t n;
107{
108  if (p == 0)
109    return xmalloc (n);
110  p = realloc (p, n);
111  if (p == 0)
112    p = fixup_null_alloc (n);
113  return p;
114}
115