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ttyslot.c revision 1.7 
      1 /*	$NetBSD: ttyslot.c,v 1.7 1997/07/21 14:07:42 jtc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 #if 0
     39 static char sccsid[] = "@(#)ttyslot.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: ttyslot.c,v 1.7 1997/07/21 14:07:42 jtc Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include "namespace.h"
     46 #include <ttyent.h>
     47 #include <stdio.h>
     48 #include <string.h>
     49 #include <unistd.h>
     50 
     51 #ifdef __weak_alias
     52 __weak_alias(ttyslot,_ttyslot);
     53 #endif
     54 
     55 int
     56 ttyslot()
     57 {
     58 	register struct ttyent *ttyp;
     59 	register int slot;
     60 	register char *p;
     61 	int cnt;
     62 	char *name;
     63 
     64 	setttyent();
     65 	for (cnt = 0; cnt < 3; ++cnt)
     66 		if ((name = ttyname(cnt)) != NULL) {
     67 			if ((p = strrchr(name, '/')) != NULL)
     68 				++p;
     69 			else
     70 				p = name;
     71 			for (slot = 1; (ttyp = getttyent()) != NULL; ++slot)
     72 				if (!strcmp(ttyp->ty_name, p)) {
     73 					endttyent();
     74 					return(slot);
     75 				}
     76 			break;
     77 		}
     78 	endttyent();
     79 	return(0);
     80 }
     81