1/* $OpenBSD: xmalloc.c,v 1.27 2006/08/03 03:34:42 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 <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 %lu bytes)", (u_long) 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 %lu bytes)",
52		    (u_long)(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 %lu bytes)",
72		    (u_long) new_size);
73	return new_ptr;
74}
75
76void
77xfree(void *ptr)
78{
79	if (ptr == NULL)
80		fatal("xfree: NULL pointer given as argument");
81	free(ptr);
82}
83
84char *
85xstrdup(const char *str)
86{
87	size_t len;
88	char *cp;
89
90	len = strlen(str) + 1;
91	cp = xmalloc(len);
92	strlcpy(cp, str, len);
93	return cp;
94}
95
96int
97xasprintf(char **ret, const char *fmt, ...)
98{
99	va_list ap;
100	int i;
101
102	va_start(ap, fmt);
103	i = vasprintf(ret, fmt, ap);
104	va_end(ap);
105
106	if (i < 0 || *ret == NULL)
107		fatal("xasprintf: could not allocate memory");
108
109	return (i);
110}
111