1 /* $OpenBSD: xmalloc.c,v 1.2 2009/06/07 08:39:13 ray 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 <err.h>
17 #include <limits.h>
18 #include <stdarg.h>
19 #include <stdint.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23
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 errx(2, NULL);
33 ptr = malloc(size);
34 if (ptr == NULL)
35 errx(2, NULL);
36 return ptr;
37 }
38
39 void *
xcalloc(size_t nmemb,size_t size)40 xcalloc(size_t nmemb, size_t size)
41 {
42 void *ptr;
43
44 if (size == 0 || nmemb == 0)
45 errx(1, "xcalloc: zero size");
46 if (SIZE_MAX / nmemb < size)
47 errx(1, "xcalloc: nmemb * size > SIZE_MAX");
48 ptr = calloc(nmemb, size);
49 if (ptr == NULL)
50 errx(1, "xcalloc: out of memory (allocating %lu bytes)",
51 (u_long)(size * nmemb));
52 return ptr;
53 }
54
55 void *
xrealloc(void * ptr,size_t nmemb,size_t size)56 xrealloc(void *ptr, size_t nmemb, size_t size)
57 {
58 void *new_ptr;
59 size_t new_size = nmemb * size;
60
61 if (new_size == 0)
62 errx(2, NULL);
63 if (SIZE_MAX / nmemb < size)
64 errx(2, NULL);
65 if (ptr == NULL)
66 new_ptr = malloc(new_size);
67 else
68 new_ptr = realloc(ptr, new_size);
69 if (new_ptr == NULL)
70 errx(2, NULL);
71 return new_ptr;
72 }
73
74 void
xfree(void * ptr)75 xfree(void *ptr)
76 {
77 if (ptr == NULL)
78 errx(2, NULL);
79 free(ptr);
80 }
81
82 char *
xstrdup(const char * str)83 xstrdup(const char *str)
84 {
85 size_t len;
86 char *cp;
87
88 len = strlen(str) + 1;
89 cp = xmalloc(len);
90 strlcpy(cp, str, len);
91 return cp;
92 }
93
94 #if 0
95 int
96 xasprintf(char **ret, const char *fmt, ...)
97 {
98 va_list ap;
99 int i;
100
101 va_start(ap, fmt);
102 i = vasprintf(ret, fmt, ap);
103 va_end(ap);
104
105 if (i < 0 || *ret == NULL)
106 errx(2, NULL);
107
108 return (i);
109 }
110 #endif
111