xref: /openssh-portable/xmalloc.c (revision ff6458e0)
1 /*
2  * Author: Tatu Ylonen <ylo@cs.hut.fi>
3  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4  *                    All rights reserved
5  * Versions of malloc and friends that check their results, and never return
6  * failure (they call fatal if they encounter an error).
7  *
8  * As far as I am concerned, the code I have written for this software
9  * can be used freely for any purpose.  Any derived versions of this
10  * software must be clearly marked as such, and if the derived work is
11  * incompatible with the protocol description in the RFC file, it must be
12  * called by a name other than "ssh" or "Secure Shell".
13  */
14 
15 #include "includes.h"
16 RCSID("$OpenBSD: xmalloc.c,v 1.16 2001/07/23 18:21:46 stevesk Exp $");
17 
18 #include "xmalloc.h"
19 #include "log.h"
20 
21 void *
22 xmalloc(size_t size)
23 {
24 	void *ptr;
25 
26 	if (size == 0)
27 		fatal("xmalloc: zero size");
28 	ptr = malloc(size);
29 	if (ptr == NULL)
30 		fatal("xmalloc: out of memory (allocating %lu bytes)", (u_long) size);
31 	return ptr;
32 }
33 
34 void *
35 xrealloc(void *ptr, size_t new_size)
36 {
37 	void *new_ptr;
38 
39 	if (new_size == 0)
40 		fatal("xrealloc: zero size");
41 	if (ptr == NULL)
42 		new_ptr = malloc(new_size);
43 	else
44 		new_ptr = realloc(ptr, new_size);
45 	if (new_ptr == NULL)
46 		fatal("xrealloc: out of memory (new_size %lu bytes)", (u_long) new_size);
47 	return new_ptr;
48 }
49 
50 void
51 xfree(void *ptr)
52 {
53 	if (ptr == NULL)
54 		fatal("xfree: NULL pointer given as argument");
55 	free(ptr);
56 }
57 
58 char *
59 xstrdup(const char *str)
60 {
61 	size_t len;
62 	char *cp;
63 
64 	len = strlen(str) + 1;
65 	cp = xmalloc(len);
66 	strlcpy(cp, str, len);
67 	return cp;
68 }
69