1/*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "defs.h"
29
30static void die_out_of_memory(void)
31{
32	static bool recursed;
33
34	if (recursed)
35		exit(1);
36	recursed = 1;
37
38	error_msg_and_die("Out of memory");
39}
40
41void *xmalloc(size_t size)
42{
43	void *p = malloc(size);
44
45	if (!p)
46		die_out_of_memory();
47
48	return p;
49}
50
51void *xcalloc(size_t nmemb, size_t size)
52{
53	void *p = calloc(nmemb, size);
54
55	if (!p)
56		die_out_of_memory();
57
58	return p;
59}
60
61#define HALF_SIZE_T	(((size_t) 1) << (sizeof(size_t) * 4))
62
63void *xreallocarray(void *ptr, size_t nmemb, size_t size)
64{
65	size_t bytes = nmemb * size;
66
67	if ((nmemb | size) >= HALF_SIZE_T &&
68	    size && bytes / size != nmemb)
69		die_out_of_memory();
70
71	void *p = realloc(ptr, bytes);
72
73	if (!p)
74		die_out_of_memory();
75
76	return p;
77}
78
79char *xstrdup(const char *str)
80{
81	char *p = strdup(str);
82
83	if (!p)
84		die_out_of_memory();
85
86	return p;
87}
88
89char *xstrndup(const char *str, size_t n)
90{
91	char *p;
92
93#ifdef HAVE_STRNDUP
94	p = strndup(str, n);
95#else
96	p = xmalloc(n + 1);
97#endif
98
99	if (!p)
100		die_out_of_memory();
101
102#ifndef HAVE_STRNDUP
103	strncpy(p, str, n);
104	p[n] = '\0';
105#endif
106
107	return p;
108}
109