[apple/libc.git] / string / FreeBSD / wcslcat.c

/*
 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *	from OpenBSD: strlcat.c,v 1.3 2000/11/24 11:10:02 itojun Exp
 */

#include <sys/cdefs.h>
#if 0
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: wcslcat.c,v 1.1 2000/12/23 23:14:36 itojun Exp $");
#endif /* LIBC_SCCS and not lint */
#endif
__FBSDID("$FreeBSD: src/lib/libc/string/wcslcat.c,v 1.7 2009/02/03 17:58:20 danger Exp $");

#include <sys/types.h>
#include <wchar.h>

/*
 * Appends src to string dst of size siz (unlike wcsncat, siz is the
 * full size of dst, not space left).  At most siz-1 characters
 * will be copied.  Always NUL terminates (unless siz == 0).
 * Returns wcslen(initial dst) + wcslen(src); if retval >= siz,
 * truncation occurred.
 */
size_t
wcslcat(wchar_t *dst, const wchar_t *src, size_t siz)
{
	wchar_t *d = dst;
	const wchar_t *s = src;
	size_t n = siz;
	size_t dlen;

	/* Find the end of dst and adjust bytes left but don't go past end */
	while (*d != '\0' && n-- != 0)
		d++;
	dlen = d - dst;
	n = siz - dlen;

	if (n == 0)
		return(dlen + wcslen(s));
	while (*s != '\0') {
		if (n != 1) {
			*d++ = *s;
			n--;
		}
		s++;
	}
	*d = '\0';

	return(dlen + (s - src));	/* count does not include NUL */
}
Commit	Line	Data
5b2abdfb A	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.
9385eb3d A	26	*
9385eb3d A	27	* from OpenBSD: strlcat.c,v 1.3 2000/11/24 11:10:02 itojun Exp
5b2abdfb A	28	*/
5b2abdfb A	29
9385eb3d A	30	#include <sys/cdefs.h>
9385eb3d A	31	#if 0
5b2abdfb	32	#if defined(LIBC_SCCS) && !defined(lint)
9385eb3d	33	__RCSID("$NetBSD: wcslcat.c,v 1.1 2000/12/23 23:14:36 itojun Exp $");
5b2abdfb	34	#endif /* LIBC_SCCS and not lint */
5b2abdfb	35	#endif
1f2f436a	36	__FBSDID("$FreeBSD: src/lib/libc/string/wcslcat.c,v 1.7 2009/02/03 17:58:20 danger Exp $");
5b2abdfb A	37
5b2abdfb A	38	#include <sys/types.h>
9385eb3d	39	#include <wchar.h>
5b2abdfb A	40
5b2abdfb A	41	/*
9385eb3d	42	* Appends src to string dst of size siz (unlike wcsncat, siz is the
5b2abdfb	43	* full size of dst, not space left). At most siz-1 characters
9385eb3d A	44	* will be copied. Always NUL terminates (unless siz == 0).
9385eb3d A	45	* Returns wcslen(initial dst) + wcslen(src); if retval >= siz,
5b2abdfb A	46	* truncation occurred.
5b2abdfb A	47	*/
9385eb3d	48	size_t
1f2f436a	49	wcslcat(wchar_t dst, const wchar_t src, size_t siz)
5b2abdfb	50	{
9385eb3d A	51	wchar_t *d = dst;
	52	const wchar_t *s = src;
	53	size_t n = siz;
5b2abdfb A	54	size_t dlen;
	55
	56	/* Find the end of dst and adjust bytes left but don't go past end */
9385eb3d	57	while (*d != '\0' && n-- != 0)
5b2abdfb A	58	d++;
	59	dlen = d - dst;
	60	n = siz - dlen;
	61
	62	if (n == 0)
9385eb3d	63	return(dlen + wcslen(s));
5b2abdfb A	64	while (*s != '\0') {
	65	if (n != 1) {
	66	d++ = s;
	67	n--;
	68	}
	69	s++;
	70	}
	71	*d = '\0';
	72
	73	return(dlen + (s - src)); /* count does not include NUL */
	74	}