1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * from OpenBSD: strlcat.c,v 1.3 2000/11/24 11:10:02 itojun Exp
30 */
31
32 #include <sys/cdefs.h>
33 #if 0
34 #if defined(LIBC_SCCS) && !defined(lint)
35 __RCSID("$NetBSD: wcslcat.c,v 1.1 2000/12/23 23:14:36 itojun Exp $");
36 #endif /* LIBC_SCCS and not lint */
37 #endif
38 __FBSDID("$FreeBSD: head/lib/libc/string/wcslcat.c 326193 2017-11-25 17:12:48Z pfg $");
39
40 #include <sys/types.h>
41 #include <wchar.h>
42
43 /*
44 * Appends src to string dst of size siz (unlike wcsncat, siz is the
45 * full size of dst, not space left). At most siz-1 characters
46 * will be copied. Always NUL terminates (unless siz == 0).
47 * Returns wcslen(initial dst) + wcslen(src); if retval >= siz,
48 * truncation occurred.
49 */
50 size_t
wcslcat(wchar_t * dst,const wchar_t * src,size_t siz)51 wcslcat(wchar_t *dst, const wchar_t *src, size_t siz)
52 {
53 wchar_t *d = dst;
54 const wchar_t *s = src;
55 size_t n = siz;
56 size_t dlen;
57
58 /* Find the end of dst and adjust bytes left but don't go past end */
59 while (n-- != 0 && *d != '\0')
60 d++;
61 dlen = d - dst;
62 n = siz - dlen;
63
64 if (n == 0)
65 return(dlen + wcslen(s));
66 while (*s != '\0') {
67 if (n != 1) {
68 *d++ = *s;
69 n--;
70 }
71 s++;
72 }
73 *d = '\0';
74
75 return(dlen + (s - src)); /* count does not include NUL */
76 }
77