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      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 (at) 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
     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