xmalloc.c revision 296781 
1/* $OpenBSD: xmalloc.c,v 1.33 2016/02/15 09:47:49 dtucker Exp $ */
2/*
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 *                    All rights reserved
6 * Versions of malloc and friends that check their results, and never return
7 * failure (they call fatal if they encounter an error).
8 *
9 * As far as I am concerned, the code I have written for this software
10 * can be used freely for any purpose.  Any derived versions of this
11 * software must be clearly marked as such, and if the derived work is
12 * incompatible with the protocol description in the RFC file, it must be
13 * called by a name other than "ssh" or "Secure Shell".
14 */
15
16#include "includes.h"
17
18#include <stdarg.h>
19#ifdef HAVE_STDINT_H
20#include <stdint.h>
21#endif
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25
26#include "xmalloc.h"
27#include "log.h"
28
29void
30ssh_malloc_init(void)
31{
32#if defined(__OpenBSD__)
33	extern char *malloc_options;
34
35	malloc_options = "S";
36#endif /* __OpenBSD__ */
37}
38
39void *
40xmalloc(size_t size)
41{
42	void *ptr;
43
44	if (size == 0)
45		fatal("xmalloc: zero size");
46	ptr = malloc(size);
47	if (ptr == NULL)
48		fatal("xmalloc: out of memory (allocating %zu bytes)", size);
49	return ptr;
50}
51
52void *
53xcalloc(size_t nmemb, size_t size)
54{
55	void *ptr;
56
57	if (size == 0 || nmemb == 0)
58		fatal("xcalloc: zero size");
59	if (SIZE_MAX / nmemb < size)
60		fatal("xcalloc: nmemb * size > SIZE_MAX");
61	ptr = calloc(nmemb, size);
62	if (ptr == NULL)
63		fatal("xcalloc: out of memory (allocating %zu bytes)",
64		    size * nmemb);
65	return ptr;
66}
67
68void *
69xreallocarray(void *ptr, size_t nmemb, size_t size)
70{
71	void *new_ptr;
72
73	new_ptr = reallocarray(ptr, nmemb, size);
74	if (new_ptr == NULL)
75		fatal("xreallocarray: out of memory (%zu elements of %zu bytes)",
76		    nmemb, size);
77	return new_ptr;
78}
79
80char *
81xstrdup(const char *str)
82{
83	size_t len;
84	char *cp;
85
86	len = strlen(str) + 1;
87	cp = xmalloc(len);
88	strlcpy(cp, str, len);
89	return cp;
90}
91
92int
93xasprintf(char **ret, const char *fmt, ...)
94{
95	va_list ap;
96	int i;
97
98	va_start(ap, fmt);
99	i = vasprintf(ret, fmt, ap);
100	va_end(ap);
101
102	if (i < 0 || *ret == NULL)
103		fatal("xasprintf: could not allocate memory");
104
105	return (i);
106}
107