1 /* $OpenBSD: xmalloc.c,v 1.32 2015/04/24 01:36:01 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 *
xmalloc(size_t size)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 *
xcalloc(size_t nmemb,size_t size)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 *
xreallocarray(void * ptr,size_t nmemb,size_t size)59 xreallocarray(void *ptr, size_t nmemb, size_t size)
60 {
61 void *new_ptr;
62
63 new_ptr = reallocarray(ptr, nmemb, size);
64 if (new_ptr == NULL)
65 fatal("xreallocarray: out of memory (%zu elements of %zu bytes)",
66 nmemb, size);
67 return new_ptr;
68 }
69
70 char *
xstrdup(const char * str)71 xstrdup(const char *str)
72 {
73 size_t len;
74 char *cp;
75
76 len = strlen(str) + 1;
77 cp = xmalloc(len);
78 strlcpy(cp, str, len);
79 return cp;
80 }
81
82 int
xasprintf(char ** ret,const char * fmt,...)83 xasprintf(char **ret, const char *fmt, ...)
84 {
85 va_list ap;
86 int i;
87
88 va_start(ap, fmt);
89 i = vasprintf(ret, fmt, ap);
90 va_end(ap);
91
92 if (i < 0 || *ret == NULL)
93 fatal("xasprintf: could not allocate memory");
94
95 return (i);
96 }
97