1/*	$NetBSD: ttyin.c,v 1.4 2003/08/07 09:28:01 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
36static char sccsid[] = "@(#)ttyin.c	8.1 (Berkeley) 6/6/93";
37#else
38__RCSID("$NetBSD: ttyin.c,v 1.4 2003/08/07 09:28:01 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
51static int tty;
52
53/*
54 * Open keyboard for input.
55 * (Just use file descriptor 2.)
56 */
57void
58open_getchr()
59{
60	tty = 2;
61}
62
63/*
64 * Get a character from the keyboard.
65 */
66int
67getchr()
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