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 "includes.h"
17
18 #include <sys/param.h>
19 #include <stdarg.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23
24 #include "xmalloc.h"
25 #include "log.h"
26
27 void *
xmalloc(size_t size)28 xmalloc(size_t size)
29 {
30 void *ptr;
31
32 if (size == 0)
33 fatal("xmalloc: zero size");
34 ptr = malloc(size);
35 if (ptr == NULL)
36 fatal("xmalloc: out of memory (allocating %lu bytes)", (u_long) size);
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 if (SIZE_T_MAX / nmemb < size)
48 fatal("xcalloc: nmemb * size > SIZE_T_MAX");
49 ptr = calloc(nmemb, size);
50 if (ptr == NULL)
51 fatal("xcalloc: out of memory (allocating %lu bytes)",
52 (u_long)(size * nmemb));
53 return ptr;
54 }
55
56 void *
xrealloc(void * ptr,size_t nmemb,size_t size)57 xrealloc(void *ptr, size_t nmemb, size_t size)
58 {
59 void *new_ptr;
60 size_t new_size = nmemb * size;
61
62 if (new_size == 0)
63 fatal("xrealloc: zero size");
64 if (SIZE_T_MAX / nmemb < size)
65 fatal("xrealloc: nmemb * size > SIZE_T_MAX");
66 if (ptr == NULL)
67 new_ptr = malloc(new_size);
68 else
69 new_ptr = realloc(ptr, new_size);
70 if (new_ptr == NULL)
71 fatal("xrealloc: out of memory (new_size %lu bytes)",
72 (u_long) new_size);
73 return new_ptr;
74 }
75
76 void
xfree(void * ptr)77 xfree(void *ptr)
78 {
79 if (ptr == NULL)
80 fatal("xfree: NULL pointer given as argument");
81 free(ptr);
82 }
83
84 char *
xstrdup(const char * str)85 xstrdup(const char *str)
86 {
87 size_t len;
88 char *cp;
89
90 len = strlen(str) + 1;
91 cp = xmalloc(len);
92 strlcpy(cp, str, len);
93 return cp;
94 }
95
96 int
xasprintf(char ** ret,const char * fmt,...)97 xasprintf(char **ret, const char *fmt, ...)
98 {
99 va_list ap;
100 int i;
101
102 va_start(ap, fmt);
103 i = vasprintf(ret, fmt, ap);
104 va_end(ap);
105
106 if (i < 0 || *ret == NULL)
107 fatal("xasprintf: could not allocate memory");
108
109 return (i);
110 }
111