[irc/quakenet/newserv.git] / lib / strlcat.c

/*	$OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $	*/

/*
 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <string.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(src) + MIN(siz, strlen(initial dst)).
 * If retval >= siz, truncation occurred.
 */
size_t
strlcat(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 */
}
Commit	Line	Data
18f8bd28 CP	1	/* $OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $ */
	2
	3	/*
	4	* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
	5	*
	6	* Permission to use, copy, modify, and distribute this software for any
	7	* purpose with or without fee is hereby granted, provided that the above
	8	* copyright notice and this permission notice appear in all copies.
	9	*
	10	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	11	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	12	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	13	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	14	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	15	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	16	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	17	*/
	18
	19	#if defined(LIBC_SCCS) && !defined(lint)
	20	static char *rcsid = "$OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $";
	21	#endif /* LIBC_SCCS and not lint */
	22
	23	#include <sys/types.h>
	24	#include <string.h>
	25
	26	/*
	27	* Appends src to string dst of size siz (unlike strncat, siz is the
	28	* full size of dst, not space left). At most siz-1 characters
	29	* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
	30	* Returns strlen(src) + MIN(siz, strlen(initial dst)).
	31	* If retval >= siz, truncation occurred.
	32	*/
	33	size_t
	34	strlcat(char dst, const char src, size_t siz)
	35	{
	36	register char *d = dst;
	37	register const char *s = src;
	38	register size_t n = siz;
	39	size_t dlen;
	40
	41	/* Find the end of dst and adjust bytes left but don't go past end */
	42	while (n-- != 0 && *d != '\0')
	43	d++;
	44	dlen = d - dst;
	45	n = siz - dlen;
	46
	47	if (n == 0)
	48	return(dlen + strlen(s));
	49	while (*s != '\0') {
	50	if (n != 1) {
	51	d++ = s;
	52	n--;
	53	}
	54	s++;
	55	}
	56	*d = '\0';
	57
	58	return(dlen + (s - src)); /* count does not include NUL */
	59	}