xref: /openssh-portable/xmalloc.c (revision 9e509d4e)
1 /* $OpenBSD: xmalloc.c,v 1.34 2017/05/31 09:15:42 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 <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 ssh_malloc_init(void)
31 {
32 #if defined(__OpenBSD__)
33 	extern char *malloc_options;
34 
35 	malloc_options = "S";
36 #endif /* __OpenBSD__ */
37 }
38 
39 void *
40 xmalloc(size_t size)
41 {
42 	void *ptr;
43 
44 	if (size == 0)
45 		fatal("xmalloc: zero size");
46 	ptr = malloc(size);
47 	if (ptr == NULL)
48 		fatal("xmalloc: out of memory (allocating %zu bytes)", size);
49 	return ptr;
50 }
51 
52 void *
53 xcalloc(size_t nmemb, size_t size)
54 {
55 	void *ptr;
56 
57 	if (size == 0 || nmemb == 0)
58 		fatal("xcalloc: zero size");
59 	if (SIZE_MAX / nmemb < size)
60 		fatal("xcalloc: nmemb * size > SIZE_MAX");
61 	ptr = calloc(nmemb, size);
62 	if (ptr == NULL)
63 		fatal("xcalloc: out of memory (allocating %zu bytes)",
64 		    size * nmemb);
65 	return ptr;
66 }
67 
68 void *
69 xreallocarray(void *ptr, size_t nmemb, size_t size)
70 {
71 	void *new_ptr;
72 
73 	new_ptr = reallocarray(ptr, nmemb, size);
74 	if (new_ptr == NULL)
75 		fatal("xreallocarray: out of memory (%zu elements of %zu bytes)",
76 		    nmemb, size);
77 	return new_ptr;
78 }
79 
80 void *
81 xrecallocarray(void *ptr, size_t onmemb, size_t nmemb, size_t size)
82 {
83 	void *new_ptr;
84 
85 	new_ptr = recallocarray(ptr, onmemb, nmemb, size);
86 	if (new_ptr == NULL)
87 		fatal("xrecallocarray: out of memory (%zu elements of %zu bytes)",
88 		    nmemb, size);
89 	return new_ptr;
90 }
91 
92 char *
93 xstrdup(const char *str)
94 {
95 	size_t len;
96 	char *cp;
97 
98 	len = strlen(str) + 1;
99 	cp = xmalloc(len);
100 	strlcpy(cp, str, len);
101 	return cp;
102 }
103 
104 int
105 xasprintf(char **ret, const char *fmt, ...)
106 {
107 	va_list ap;
108 	int i;
109 
110 	va_start(ap, fmt);
111 	i = vasprintf(ret, fmt, ap);
112 	va_end(ap);
113 
114 	if (i < 0 || *ret == NULL)
115 		fatal("xasprintf: could not allocate memory");
116 
117 	return (i);
118 }
119