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/*      $OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt 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.

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char *rcsid = "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt 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

_DEFUN (strlcat, (dst, src, siz),

        char *dst _AND

        _CONST char *src _AND

        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 */

}