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      1 /*	$NetBSD: ttyin.c,v 1.5 2003/10/13 14:34:25 agc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 Mark Nudelman
      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. Neither the name of the University nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 #ifndef lint
     35 #if 0
     36 static char sccsid[] = "@(#)ttyin.c	8.1 (Berkeley) 6/6/93";
     37 #else
     38 __RCSID("$NetBSD: ttyin.c,v 1.5 2003/10/13 14:34:25 agc Exp $");
     39 #endif
     40 #endif /* not lint */
     41 
     42 /*
     43  * Routines dealing with getting input from the keyboard (i.e. from the user).
     44  */
     45 
     46 #include <sys/types.h>
     47 
     48 #include "less.h"
     49 #include "extern.h"
     50 
     51 static int tty;
     52 
     53 /*
     54  * Open keyboard for input.
     55  * (Just use file descriptor 2.)
     56  */
     57 void
     58 open_getchr()
     59 {
     60 	tty = 2;
     61 }
     62 
     63 /*
     64  * Get a character from the keyboard.
     65  */
     66 int
     67 getchr()
     68 {
     69 	char c;
     70 	int result;
     71 
     72 	do
     73 	{
     74 		result = iread(tty, &c, 1);
     75 		if (result == READ_INTR)
     76 			return (READ_INTR);
     77 		if (result < 0)
     78 		{
     79 			/*
     80 			 * Don't call error() here,
     81 			 * because error calls getchr!
     82 			 */
     83 			quit();
     84 		}
     85 	} while (result != 1);
     86 	return (c & 0177);
     87 }
     88