[openssh.git] / openbsd-compat / strlcat.c

/*	$OpenBSD: strlcat.c,v 1.5 2001/01/13 16:17:24 millert Exp $	*/

/*
 * 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.
 */

#include "config.h"
#ifndef HAVE_STRLCAT

#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$OpenBSD: strlcat.c,v 1.5 2001/01/13 16:17:24 millert Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <string.h>
#include "strlcat.h"

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

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

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

	return(dlen + (s - src));	/* count does not include NUL */
}

#endif /* !HAVE_STRLCAT */
Commit	Line	Data
e400a640	1	/* $OpenBSD: strlcat.c,v 1.5 2001/01/13 16:17:24 millert Exp $ */
b09a984b	2
	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
	30	#include "config.h"
	31	#ifndef HAVE_STRLCAT
	32
	33	#if defined(LIBC_SCCS) && !defined(lint)
e400a640	34	static char *rcsid = "$OpenBSD: strlcat.c,v 1.5 2001/01/13 16:17:24 millert Exp $";
b09a984b	35	#endif /* LIBC_SCCS and not lint */
	36
	37	#include <sys/types.h>
	38	#include <string.h>
d60382e0	39	#include "strlcat.h"
b09a984b	40
	41	/*
	42	* Appends src to string dst of size siz (unlike strncat, siz is the
	43	* full size of dst, not space left). At most siz-1 characters
e400a640	44	* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
	45	* Returns strlen(initial dst) + strlen(src); if retval >= siz,
	46	* truncation occurred.
b09a984b	47	*/
	48	size_t strlcat(dst, src, siz)
	49	char *dst;
	50	const char *src;
	51	size_t siz;
	52	{
	53	register char *d = dst;
	54	register const char *s = src;
	55	register 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 */
e400a640	59	while (n-- != 0 && *d != '\0')
b09a984b	60	d++;
	61	dlen = d - dst;
	62	n = siz - dlen;
	63
	64	if (n == 0)
	65	return(dlen + strlen(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
	78	#endif /* !HAVE_STRLCAT */