Add nsswitch support.
[dragonfly.git] / lib / libc / string / wcslcat.c
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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 *
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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 1.3.2.1 2001/07/11 23:48:38 obrien Exp $
bd4c62e8 30 * $DragonFly: src/lib/libc/string/wcslcat.c,v 1.3 2005/09/18 16:32:34 asmodai Exp $
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31 */
32
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33#include <sys/types.h>
34#include <assert.h>
35#include <wchar.h>
36
37/*
38 * Appends src to string dst of size siz (unlike wcsncat, siz is the
39 * full size of dst, not space left). At most siz-1 characters
40 * will be copied. Always NUL terminates (unless siz == 0).
41 * Returns wcslen(initial dst) + wcslen(src); if retval >= siz,
42 * truncation occurred.
43 */
44size_t
bd4c62e8 45wcslcat(wchar_t *dst, const wchar_t *src, size_t siz)
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46{
47 wchar_t *d = dst;
48 const wchar_t *s = src;
49 size_t n = siz;
50 size_t dlen;
51
52 /* Find the end of dst and adjust bytes left but don't go past end */
53 while (*d != '\0' && n-- != 0)
54 d++;
55 dlen = d - dst;
56 n = siz - dlen;
57
58 if (n == 0)
59 return(dlen + wcslen(s));
60 while (*s != '\0') {
61 if (n != 1) {
62 *d++ = *s;
63 n--;
64 }
65 s++;
66 }
67 *d = '\0';
68
69 return(dlen + (s - src)); /* count does not include NUL */
70}