1 /* $NetBSD: wcslcat.c,v 1.3 2012/06/25 22:32:46 abs Exp $ */
2 /* from OpenBSD: strlcat.c,v 1.3 2000/11/24 11:10:02 itojun Exp */
3
4 /*
5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
21 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
22 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 #if defined(LIBC_SCCS) && !defined(lint)
33 __RCSID("$NetBSD: wcslcat.c,v 1.3 2012/06/25 22:32:46 abs Exp $");
34 #endif /* LIBC_SCCS and not lint */
35
36 #include <sys/types.h>
37 #include <assert.h>
38 #include <wchar.h>
39
40 /*
41 * Appends src to string dst of size siz (unlike wcsncat, siz is the
42 * full size of dst, not space left). At most siz-1 characters
43 * will be copied. Always NUL terminates (unless siz == 0).
44 * Returns wcslen(initial dst) + wcslen(src); if retval >= siz,
45 * truncation occurred.
46 */
47 size_t
wcslcat(wchar_t * dst,const wchar_t * src,size_t siz)48 wcslcat(wchar_t *dst, const wchar_t *src, size_t siz)
49 {
50 wchar_t *d = dst;
51 const wchar_t *s = src;
52 size_t n = siz;
53 size_t dlen;
54
55 _DIAGASSERT(dst != NULL);
56 _DIAGASSERT(src != NULL);
57
58 /* Find the end of dst and adjust bytes left but don't go past end */
59 while (*d != '\0' && n-- != 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