1/* xmalloc.c -- malloc with out of memory checking
2 Copyright (C) 1990-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, see <https://www.gnu.org/licenses/>. */
17
18#ifdef HAVE_CONFIG_H
19#include <config.h>
20#endif
21
22#define VOID void
23
24#include <sys/types.h>
25
26#if STDC_HEADERS || _LIBC
27#include <stdlib.h>
28static VOID *fixup_null_alloc (size_t n) __THROW;
29VOID *xmalloc (size_t n) __THROW;
30VOID *xcalloc (size_t n, size_t s) __THROW;
31VOID *xrealloc (VOID *p, size_t n) __THROW;
32#else
33VOID *calloc ();
34VOID *malloc ();
35VOID *realloc ();
36void free ();
37#endif
38
39#include <libintl.h>
40#include "error.h"
41
42#ifndef _
43# define _(str) gettext (str)
44#endif
45
46#ifndef EXIT_FAILURE
47#define EXIT_FAILURE 4
48#endif
49
50/* Exit value when the requested amount of memory is not available.
51 The caller may set it to some other value. */
52int xmalloc_exit_failure = EXIT_FAILURE;
53
54static VOID *
55fixup_null_alloc (size_t n)
56{
57 VOID *p;
58
59 p = 0;
60 if (n == 0)
61 p = malloc ((size_t) 1);
62 if (p == 0)
63 error (xmalloc_exit_failure, 0, _("memory exhausted"));
64 return p;
65}
66
67/* Allocate N bytes of memory dynamically, with error checking. */
68
69VOID *
70xmalloc (size_t n)
71{
72 VOID *p;
73
74 p = malloc (n);
75 if (p == 0)
76 p = fixup_null_alloc (n);
77 return p;
78}
79
80/* Allocate memory for N elements of S bytes, with error checking. */
81
82VOID *
83xcalloc (size_t n, size_t s)
84{
85 VOID *p;
86
87 p = calloc (n, s);
88 if (p == 0)
89 p = fixup_null_alloc (n);
90 return p;
91}
92
93/* Change the size of an allocated block of memory P to N bytes,
94 with error checking.
95 If P is NULL, run xmalloc. */
96
97VOID *
98xrealloc (VOID *p, size_t n)
99{
100 if (p == 0)
101 return xmalloc (n);
102 p = realloc (p, n);
103 if (p == 0)
104 p = fixup_null_alloc (n);
105 return p;
106}
107