1 /* $NetBSD: wcslcpy.c,v 1.3 2012/06/25 22:32:46 abs Exp $ */
2 /* from OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert 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: wcslcpy.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 * Copy src to string dst of size siz. At most siz-1 characters
42 * will be copied. Always NUL terminates (unless siz == 0).
43 * Returns wcslen(src); if retval >= siz, truncation occurred.
44 */
45 size_t
wcslcpy(wchar_t * dst,const wchar_t * src,size_t siz)46 wcslcpy(wchar_t *dst, const wchar_t *src, size_t siz)
47 {
48 wchar_t *d = dst;
49 const wchar_t *s = src;
50 size_t n = siz;
51
52 _DIAGASSERT(dst != NULL);
53 _DIAGASSERT(src != NULL);
54
55 /* Copy as many bytes as will fit */
56 if (n != 0 && --n != 0) {
57 do {
58 if ((*d++ = *s++) == 0)
59 break;
60 } while (--n != 0);
61 }
62
63 /* Not enough room in dst, add NUL and traverse rest of src */
64 if (n == 0) {
65 if (siz != 0)
66 *d = '\0'; /* NUL-terminate dst */
67 while (*s++)
68 ;
69 }
70
71 return(s - src - 1); /* count does not include NUL */
72 }
73