1/*
2 * Copyright (C) 1984-2012  Mark Nudelman
3 * Modified for use with illumos by Garrett D'Amore.
4 * Copyright 2014 Garrett D'Amore <garrett@damore.org>
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Less License, as specified in the README file.
8 *
9 * For more information, see the README file.
10 */
11
12/*
13 * Routines dealing with getting input from the keyboard (i.e. from the user).
14 */
15
16#include "less.h"
17
18int tty;
19extern int utf_mode;
20
21/*
22 * Open keyboard for input.
23 */
24void
25open_getchr(void)
26{
27	/*
28	 * Try /dev/tty.
29	 * If that doesn't work, use file descriptor 2,
30	 * which in Unix is usually attached to the screen,
31	 * but also usually lets you read from the keyboard.
32	 */
33	tty = open("/dev/tty", O_RDONLY);
34	if (tty == -1)
35		tty = STDERR_FILENO;
36}
37
38/*
39 * Get a character from the keyboard.
40 */
41int
42getchr(void)
43{
44	unsigned char c;
45	int result;
46
47	do {
48		result = iread(tty, &c, sizeof (char));
49		if (result == READ_INTR)
50			return (READ_INTR);
51		if (result < 0) {
52			/*
53			 * Don't call error() here,
54			 * because error calls getchr!
55			 */
56			quit(QUIT_ERROR);
57		}
58		/*
59		 * Various parts of the program cannot handle
60		 * an input character of '\0'.
61		 * If a '\0' was actually typed, convert it to '\340' here.
62		 */
63		if (c == '\0')
64			c = 0340;
65	} while (result != 1);
66
67	return (c & 0xFF);
68}
69