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
open_getchr()58 open_getchr()
59 {
60 tty = 2;
61 }
62
63 /*
64 * Get a character from the keyboard.
65 */
66 int
getchr()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