xref: /openssh-portable/xmalloc.c (revision 9af21979)
1 /* $OpenBSD: xmalloc.c,v 1.31 2015/02/06 23:21:59 millert 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 
29 void *
30 xmalloc(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 
42 void *
43 xcalloc(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 
58 void *
59 xrealloc(void *ptr, size_t nmemb, size_t size)
60 {
61 	void *new_ptr;
62 	size_t new_size = nmemb * size;
63 
64 	if (new_size == 0)
65 		fatal("xrealloc: zero size");
66 	if (SIZE_MAX / nmemb < size)
67 		fatal("xrealloc: nmemb * size > SIZE_MAX");
68 	if (ptr == NULL)
69 		new_ptr = malloc(new_size);
70 	else
71 		new_ptr = realloc(ptr, new_size);
72 	if (new_ptr == NULL)
73 		fatal("xrealloc: out of memory (new_size %zu bytes)",
74 		    new_size);
75 	return new_ptr;
76 }
77 
78 char *
79 xstrdup(const char *str)
80 {
81 	size_t len;
82 	char *cp;
83 
84 	len = strlen(str) + 1;
85 	cp = xmalloc(len);
86 	strlcpy(cp, str, len);
87 	return cp;
88 }
89 
90 int
91 xasprintf(char **ret, const char *fmt, ...)
92 {
93 	va_list ap;
94 	int i;
95 
96 	va_start(ap, fmt);
97 	i = vasprintf(ret, fmt, ap);
98 	va_end(ap);
99 
100 	if (i < 0 || *ret == NULL)
101 		fatal("xasprintf: could not allocate memory");
102 
103 	return (i);
104 }
105