xref: /freebsd/contrib/openpam/lib/libpam/openpam_strlcat.c (revision ce77a8d6923d67accfee464f031330c83f551f9e)

/*-
 * Copyright (c) 2011-2012 Dag-Erling Smørgrav
 * 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 BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 *
 * $Id: openpam_strlcat.c 648 2013-03-05 17:54:27Z des $
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifndef HAVE_STRLCAT

#include <stddef.h>

#include "openpam_strlcat.h"

/* like strcat(3), but always NUL-terminates; returns strlen(src) */
size_t
openpam_strlcat(char *dst, const char *src, size_t size)
{
	size_t len;

	for (len = 0; *dst && size > 1; ++len, --size)
		dst++;
	for (; *src && size > 1; ++len, --size)
		*dst++ = *src++;
	*dst = '\0';
	while (*src)
		++len, ++src;
	return (len);
}

#endif