/*	$OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie 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.

 */

#include <net-snmp/net-snmp-config.h>

#ifndef HAVE_STRLCAT

#if HAVE_STRING_H

#include <string.h>

#else

#include <strings.h>

#endif

#include <sys/types.h>

#include <net-snmp/library/system.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)

{

	char *d = dst;

	const char *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 (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