1 /* $OpenBSD: xmalloc.c,v 1.14 2019/06/28 05:44:09 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 <errno.h>
17 #include <limits.h>
18 #include <stdint.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22
23 #include "log.h"
24 #include "xmalloc.h"
25
26 void *
xmalloc(size_t size)27 xmalloc(size_t size)
28 {
29 void *ptr;
30
31 if (size == 0)
32 fatal("xmalloc: zero size");
33 ptr = malloc(size);
34 if (ptr == NULL)
35 fatal("xmalloc: allocating %zu bytes: %s",
36 size, strerror(errno));
37 return ptr;
38 }
39
40 void *
xcalloc(size_t nmemb,size_t size)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 ptr = calloc(nmemb, size);
48 if (ptr == NULL)
49 fatal("xcalloc: allocating %zu * %zu bytes: %s",
50 nmemb, size, strerror(errno));
51 return ptr;
52 }
53
54 void *
xreallocarray(void * ptr,size_t nmemb,size_t size)55 xreallocarray(void *ptr, size_t nmemb, size_t size)
56 {
57 void *new_ptr;
58
59 if (nmemb == 0 || size == 0)
60 fatal("xreallocarray: zero size");
61 new_ptr = reallocarray(ptr, nmemb, size);
62 if (new_ptr == NULL)
63 fatal("xreallocarray: allocating %zu * %zu bytes: %s",
64 nmemb, size, strerror(errno));
65 return new_ptr;
66 }
67
68 char *
xstrdup(const char * str)69 xstrdup(const char *str)
70 {
71 char *cp;
72
73 if ((cp = strdup(str)) == NULL)
74 fatal("xstrdup: %s", strerror(errno));
75 return cp;
76 }
77
78 int
xasprintf(char ** ret,const char * fmt,...)79 xasprintf(char **ret, const char *fmt, ...)
80 {
81 va_list ap;
82 int i;
83
84 va_start(ap, fmt);
85 i = vasprintf(ret, fmt, ap);
86 va_end(ap);
87
88 if (i == -1)
89 fatal("xasprintf: %s", strerror(errno));
90
91 return i;
92 }
93
94 int
xsnprintf(char * str,size_t len,const char * fmt,...)95 xsnprintf(char *str, size_t len, const char *fmt, ...)
96 {
97 va_list ap;
98 int i;
99
100 if (len > INT_MAX)
101 fatal("xsnprintf: len > INT_MAX");
102
103 va_start(ap, fmt);
104 i = vsnprintf(str, len, fmt, ap);
105 va_end(ap);
106
107 if (i < 0 || i >= (int)len)
108 fatal("xsnprintf: overflow");
109
110 return i;
111 }
112