xref: /openssh-portable/xmalloc.c (revision 130ef069)
1 /* $OpenBSD: xmalloc.c,v 1.35 2019/06/06 05:13:13 otto 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 #if defined(__OpenBSD__)
30 char *malloc_options = "S";
31 #endif /* __OpenBSD__ */
32 
33 void *
xmalloc(size_t size)34 xmalloc(size_t size)
35 {
36 	void *ptr;
37 
38 	if (size == 0)
39 		fatal("xmalloc: zero size");
40 	ptr = malloc(size);
41 	if (ptr == NULL)
42 		fatal("xmalloc: out of memory (allocating %zu bytes)", size);
43 	return ptr;
44 }
45 
46 void *
xcalloc(size_t nmemb,size_t size)47 xcalloc(size_t nmemb, size_t size)
48 {
49 	void *ptr;
50 
51 	if (size == 0 || nmemb == 0)
52 		fatal("xcalloc: zero size");
53 	if (SIZE_MAX / nmemb < size)
54 		fatal("xcalloc: nmemb * size > SIZE_MAX");
55 	ptr = calloc(nmemb, size);
56 	if (ptr == NULL)
57 		fatal("xcalloc: out of memory (allocating %zu bytes)",
58 		    size * nmemb);
59 	return ptr;
60 }
61 
62 void *
xreallocarray(void * ptr,size_t nmemb,size_t size)63 xreallocarray(void *ptr, size_t nmemb, size_t size)
64 {
65 	void *new_ptr;
66 
67 	new_ptr = reallocarray(ptr, nmemb, size);
68 	if (new_ptr == NULL)
69 		fatal("xreallocarray: out of memory (%zu elements of %zu bytes)",
70 		    nmemb, size);
71 	return new_ptr;
72 }
73 
74 void *
xrecallocarray(void * ptr,size_t onmemb,size_t nmemb,size_t size)75 xrecallocarray(void *ptr, size_t onmemb, size_t nmemb, size_t size)
76 {
77 	void *new_ptr;
78 
79 	new_ptr = recallocarray(ptr, onmemb, nmemb, size);
80 	if (new_ptr == NULL)
81 		fatal("xrecallocarray: out of memory (%zu elements of %zu bytes)",
82 		    nmemb, size);
83 	return new_ptr;
84 }
85 
86 char *
xstrdup(const char * str)87 xstrdup(const char *str)
88 {
89 	size_t len;
90 	char *cp;
91 
92 	len = strlen(str) + 1;
93 	cp = xmalloc(len);
94 	strlcpy(cp, str, len);
95 	return cp;
96 }
97 
98 int
xasprintf(char ** ret,const char * fmt,...)99 xasprintf(char **ret, const char *fmt, ...)
100 {
101 	va_list ap;
102 	int i;
103 
104 	va_start(ap, fmt);
105 	i = vasprintf(ret, fmt, ap);
106 	va_end(ap);
107 
108 	if (i < 0 || *ret == NULL)
109 		fatal("xasprintf: could not allocate memory");
110 
111 	return (i);
112 }
113