Home | History | Annotate | Line # | Download | only in more
ttyin.c revision 1.3 
      1 /*	$NetBSD: ttyin.c,v 1.3 1998/02/04 11:09:13 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 Mark Nudleman
      5  * Copyright (c) 1988, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)ttyin.c	8.1 (Berkeley) 6/6/93";
     41 #else
     42 __RCSID("$NetBSD: ttyin.c,v 1.3 1998/02/04 11:09:13 christos Exp $");
     43 #endif
     44 #endif /* not lint */
     45 
     46 /*
     47  * Routines dealing with getting input from the keyboard (i.e. from the user).
     48  */
     49 
     50 #include <sys/types.h>
     51 
     52 #include "less.h"
     53 #include "extern.h"
     54 
     55 static int tty;
     56 
     57 /*
     58  * Open keyboard for input.
     59  * (Just use file descriptor 2.)
     60  */
     61 void
     62 open_getchr()
     63 {
     64 	tty = 2;
     65 }
     66 
     67 /*
     68  * Get a character from the keyboard.
     69  */
     70 int
     71 getchr()
     72 {
     73 	char c;
     74 	int result;
     75 
     76 	do
     77 	{
     78 		result = iread(tty, &c, 1);
     79 		if (result == READ_INTR)
     80 			return (READ_INTR);
     81 		if (result < 0)
     82 		{
     83 			/*
     84 			 * Don't call error() here,
     85 			 * because error calls getchr!
     86 			 */
     87 			quit();
     88 		}
     89 	} while (result != 1);
     90 	return (c & 0177);
     91 }
     92