xref: /openssh-portable/xmalloc.c (revision 3e498536)
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 
27 void *
28 xmalloc(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 
40 void *
41 xcalloc(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 
56 void *
57 xrealloc(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 
76 char *
77 xstrdup(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 
88 int
89 xasprintf(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