xmalloc.c revision 262566 
1/* $OpenBSD: xmalloc.c,v 1.29 2014/01/04 17:50:55 tedu 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 <sys/param.h>
19#include <stdarg.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23
24#include "xmalloc.h"
25#include "log.h"
26
27void *
28xmalloc(size_t size)
29{
30	void *ptr;
31
32	if (size == 0)
33		fatal("xmalloc: zero size");
34	ptr = malloc(size);
35	if (ptr == NULL)
36		fatal("xmalloc: out of memory (allocating %zu bytes)", size);
37	return ptr;
38}
39
40void *
41xcalloc(size_t nmemb, size_t size)
42{
43	void *ptr;
44
45	if (size == 0 || nmemb == 0)
46		fatal("xcalloc: zero size");
47	if (SIZE_T_MAX / nmemb < size)
48		fatal("xcalloc: nmemb * size > SIZE_T_MAX");
49	ptr = calloc(nmemb, size);
50	if (ptr == NULL)
51		fatal("xcalloc: out of memory (allocating %zu bytes)",
52		    size * nmemb);
53	return ptr;
54}
55
56void *
57xrealloc(void *ptr, size_t nmemb, size_t size)
58{
59	void *new_ptr;
60	size_t new_size = nmemb * size;
61
62	if (new_size == 0)
63		fatal("xrealloc: zero size");
64	if (SIZE_T_MAX / nmemb < size)
65		fatal("xrealloc: nmemb * size > SIZE_T_MAX");
66	if (ptr == NULL)
67		new_ptr = malloc(new_size);
68	else
69		new_ptr = realloc(ptr, new_size);
70	if (new_ptr == NULL)
71		fatal("xrealloc: out of memory (new_size %zu bytes)",
72		    new_size);
73	return new_ptr;
74}
75
76char *
77xstrdup(const char *str)
78{
79	size_t len;
80	char *cp;
81
82	len = strlen(str) + 1;
83	cp = xmalloc(len);
84	strlcpy(cp, str, len);
85	return cp;
86}
87
88int
89xasprintf(char **ret, const char *fmt, ...)
90{
91	va_list ap;
92	int i;
93
94	va_start(ap, fmt);
95	i = vasprintf(ret, fmt, ap);
96	va_end(ap);
97
98	if (i < 0 || *ret == NULL)
99		fatal("xasprintf: could not allocate memory");
100
101	return (i);
102}
103