/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "lint.h"

#include <string.h>

#include <sys/types.h>

/*

 * Appends src to the dstsize buffer at dst. The append will never

 * overflow the destination buffer and the buffer will always be null

 * terminated. Never reference beyond &dst[dstsize-1] when computing

 * the length of the pre-existing string.

 */

size_t

strlcat(char *dst, const char *src, size_t dstsize)

{

	char *df = dst;

	size_t left = dstsize;

	size_t l1;

	size_t l2 = strlen(src);

	size_t copied;

	while (left-- != 0 && *df != '\0')

		df++;

	l1 = df - dst;

	if (dstsize == l1)

		return (l1 + l2);

	copied = l1 + l2 >= dstsize ? dstsize - l1 - 1 : l2;

	(void) memcpy(dst + l1, src, copied);

	dst[l1+copied] = '\0';

	return (l1 + l2);

}