1 /* $OpenBSD: xmalloc.c,v 1.33 2016/02/15 09:47:49 dtucker 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
ssh_malloc_init(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 *
xmalloc(size_t size)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 *
xcalloc(size_t nmemb,size_t size)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 *
xreallocarray(void * ptr,size_t nmemb,size_t size)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 char *
xstrdup(const char * str)81 xstrdup(const char *str)
82 {
83 size_t len;
84 char *cp;
85
86 len = strlen(str) + 1;
87 cp = xmalloc(len);
88 strlcpy(cp, str, len);
89 return cp;
90 }
91
92 int
xasprintf(char ** ret,const char * fmt,...)93 xasprintf(char **ret, const char *fmt, ...)
94 {
95 va_list ap;
96 int i;
97
98 va_start(ap, fmt);
99 i = vasprintf(ret, fmt, ap);
100 va_end(ap);
101
102 if (i < 0 || *ret == NULL)
103 fatal("xasprintf: could not allocate memory");
104
105 return (i);
106 }
107