xmalloc.c revision 295367 
1/* $OpenBSD: xmalloc.c,v 1.32 2015/04/24 01:36:01 deraadt 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 *
30xmalloc(size_t size)
31{
32	void *ptr;
33
34	if (size == 0)
35		fatal("xmalloc: zero size");
36	ptr = malloc(size);
37	if (ptr == NULL)
38		fatal("xmalloc: out of memory (allocating %zu bytes)", size);
39	return ptr;
40}
41
42void *
43xcalloc(size_t nmemb, size_t size)
44{
45	void *ptr;
46
47	if (size == 0 || nmemb == 0)
48		fatal("xcalloc: zero size");
49	if (SIZE_MAX / nmemb < size)
50		fatal("xcalloc: nmemb * size > SIZE_MAX");
51	ptr = calloc(nmemb, size);
52	if (ptr == NULL)
53		fatal("xcalloc: out of memory (allocating %zu bytes)",
54		    size * nmemb);
55	return ptr;
56}
57
58void *
59xreallocarray(void *ptr, size_t nmemb, size_t size)
60{
61	void *new_ptr;
62
63	new_ptr = reallocarray(ptr, nmemb, size);
64	if (new_ptr == NULL)
65		fatal("xreallocarray: out of memory (%zu elements of %zu bytes)",
66		    nmemb, size);
67	return new_ptr;
68}
69
70char *
71xstrdup(const char *str)
72{
73	size_t len;
74	char *cp;
75
76	len = strlen(str) + 1;
77	cp = xmalloc(len);
78	strlcpy(cp, str, len);
79	return cp;
80}
81
82int
83xasprintf(char **ret, const char *fmt, ...)
84{
85	va_list ap;
86	int i;
87
88	va_start(ap, fmt);
89	i = vasprintf(ret, fmt, ap);
90	va_end(ap);
91
92	if (i < 0 || *ret == NULL)
93		fatal("xasprintf: could not allocate memory");
94
95	return (i);
96}
97