/*

 * Copyright (c) 1988, 1993

 *	The Regents of the University of California.  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.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.

 */

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

static char sccsid[] = "@(#)ttyslot.c	8.1 (Berkeley) 6/4/93";

#endif /* LIBC_SCCS and not lint */

#include <ttyent.h>

#include <alloca.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

int

ttyslot (void)

{

	struct ttyent *ttyp;

	int slot;

	char *p;

	int cnt;

	size_t buflen = __sysconf (_SC_TTY_NAME_MAX) + 1;

	char *name;

	if (buflen == 0)

	  /* This should be enough if no fixed value is given.  */

	  buflen = 32;

	name = __alloca (buflen);

	__setttyent();

	for (cnt = 0; cnt < 3; ++cnt)

		if (__ttyname_r (cnt, name, buflen) == 0) {

			if ((p = strrchr (name, '/')))

				++p;

			else

				p = name;

			for (slot = 1; (ttyp = __getttyent()); ++slot)

				if (!strcmp(ttyp->ty_name, p)) {

					__endttyent();

					return(slot);

				}

			break;

		}

	__endttyent();

	return(0);

}