1 /* $OpenBSD: xmalloc.c,v 1.31 2015/02/06 23:21:59 millert 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 *
xrealloc(void * ptr,size_t nmemb,size_t size)59 xrealloc(void *ptr, size_t nmemb, size_t size)
60 {
61 void *new_ptr;
62 size_t new_size = nmemb * size;
63
64 if (new_size == 0)
65 fatal("xrealloc: zero size");
66 if (SIZE_MAX / nmemb < size)
67 fatal("xrealloc: nmemb * size > SIZE_MAX");
68 if (ptr == NULL)
69 new_ptr = malloc(new_size);
70 else
71 new_ptr = realloc(ptr, new_size);
72 if (new_ptr == NULL)
73 fatal("xrealloc: out of memory (new_size %zu bytes)",
74 new_size);
75 return new_ptr;
76 }
77
78 char *
xstrdup(const char * str)79 xstrdup(const char *str)
80 {
81 size_t len;
82 char *cp;
83
84 len = strlen(str) + 1;
85 cp = xmalloc(len);
86 strlcpy(cp, str, len);
87 return cp;
88 }
89
90 int
xasprintf(char ** ret,const char * fmt,...)91 xasprintf(char **ret, const char *fmt, ...)
92 {
93 va_list ap;
94 int i;
95
96 va_start(ap, fmt);
97 i = vasprintf(ret, fmt, ap);
98 va_end(ap);
99
100 if (i < 0 || *ret == NULL)
101 fatal("xasprintf: could not allocate memory");
102
103 return (i);
104 }
105