1 /* $OpenBSD: xmalloc.c,v 1.27 2006/08/03 03:34:42 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 <sys/param.h>
17 #include <stdarg.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <string.h>
21
22 #include "xmalloc.h"
23 #include "log.h"
24
25 void *
xmalloc(size_t size)26 xmalloc(size_t size)
27 {
28 void *ptr;
29
30 if (size == 0)
31 fatal("xmalloc: zero size");
32 ptr = malloc(size);
33 if (ptr == NULL)
34 fatal("xmalloc: out of memory (allocating %lu bytes)", (u_long) size);
35 return ptr;
36 }
37
38 void *
xcalloc(size_t nmemb,size_t size)39 xcalloc(size_t nmemb, size_t size)
40 {
41 void *ptr;
42
43 if (size == 0 || nmemb == 0)
44 fatal("xcalloc: zero size");
45 if (SIZE_T_MAX / nmemb < size)
46 fatal("xcalloc: nmemb * size > SIZE_T_MAX");
47 ptr = calloc(nmemb, size);
48 if (ptr == NULL)
49 fatal("xcalloc: out of memory (allocating %lu bytes)",
50 (u_long)(size * nmemb));
51 return ptr;
52 }
53
54 void *
xrealloc(void * ptr,size_t nmemb,size_t size)55 xrealloc(void *ptr, size_t nmemb, size_t size)
56 {
57 void *new_ptr;
58 size_t new_size = nmemb * size;
59
60 if (new_size == 0)
61 fatal("xrealloc: zero size");
62 if (SIZE_T_MAX / nmemb < size)
63 fatal("xrealloc: nmemb * size > SIZE_T_MAX");
64 if (ptr == NULL)
65 new_ptr = malloc(new_size);
66 else
67 new_ptr = realloc(ptr, new_size);
68 if (new_ptr == NULL)
69 fatal("xrealloc: out of memory (new_size %lu bytes)",
70 (u_long) new_size);
71 return new_ptr;
72 }
73
74 void
xfree(void * ptr)75 xfree(void *ptr)
76 {
77 if (ptr == NULL)
78 fatal("xfree: NULL pointer given as argument");
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 int
xasprintf(char ** ret,const char * fmt,...)95 xasprintf(char **ret, const char *fmt, ...)
96 {
97 va_list ap;
98 int i;
99
100 va_start(ap, fmt);
101 i = vasprintf(ret, fmt, ap);
102 va_end(ap);
103
104 if (i < 0 || *ret == NULL)
105 fatal("xasprintf: could not allocate memory");
106
107 return (i);
108 }
109