xref: /dragonfly/lib/libc/string/wcslcat.c (revision 1b722dce)
1 /*
2  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. The name of the author may not be used to endorse or promote products
14  *    derived from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
19  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  *
27  * $OpenBSD: strlcat.c,v 1.3 2000/11/24 11:10:02 itojun Exp $
28  * $NetBSD: wcslcat.c,v 1.1 2000/12/23 23:14:36 itojun Exp $
29  * $FreeBSD: src/lib/libc/string/wcslcat.c,v 1.6 2002/09/21 00:29:23 tjr Exp $
30  * $DragonFly: src/lib/libc/string/wcslcat.c,v 1.3 2005/09/18 16:32:34 asmodai Exp $
31  */
32 
33 #include <sys/types.h>
34 #include <wchar.h>
35 
36 /*
37  * Appends src to string dst of size siz (unlike wcsncat, siz is the
38  * full size of dst, not space left).  At most siz-1 characters
39  * will be copied.  Always NUL terminates (unless siz == 0).
40  * Returns wcslen(initial dst) + wcslen(src); if retval >= siz,
41  * truncation occurred.
42  */
43 size_t
44 wcslcat(wchar_t *dst, const wchar_t *src, size_t siz)
45 {
46 	wchar_t *d = dst;
47 	const wchar_t *s = src;
48 	size_t n = siz;
49 	size_t dlen;
50 
51 	/* Find the end of dst and adjust bytes left but don't go past end */
52 	while (*d != '\0' && n-- != 0)
53 		d++;
54 	dlen = d - dst;
55 	n = siz - dlen;
56 
57 	if (n == 0)
58 		return(dlen + wcslen(s));
59 	while (*s != '\0') {
60 		if (n != 1) {
61 			*d++ = *s;
62 			n--;
63 		}
64 		s++;
65 	}
66 	*d = '\0';
67 
68 	return(dlen + (s - src));	/* count does not include NUL */
69 }
70