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2ec5f51d NW |
1 | /* |
2 | * Copyright (c) 1988 Mark Nudleman | |
3 | * Copyright (c) 1988 Regents of the University of California. | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * 3. All advertising materials mentioning features or use of this software | |
15 | * must display the following acknowledgement: | |
16 | * This product includes software developed by the University of | |
17 | * California, Berkeley and its contributors. | |
18 | * 4. Neither the name of the University nor the names of its contributors | |
19 | * may be used to endorse or promote products derived from this software | |
20 | * without specific prior written permission. | |
21 | * | |
22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
32 | * SUCH DAMAGE. | |
33 | */ | |
34 | ||
35 | #ifndef lint | |
36 | static char sccsid[] = "@(#)ttyin.c 5.4 (Berkeley) 6/1/90"; | |
37 | #endif /* not lint */ | |
38 | ||
39 | /* | |
40 | * Routines dealing with getting input from the keyboard (i.e. from the user). | |
41 | */ | |
42 | ||
43 | #include <less.h> | |
44 | ||
45 | static int tty; | |
46 | ||
47 | /* | |
48 | * Open keyboard for input. | |
49 | * (Just use file descriptor 2.) | |
50 | */ | |
51 | open_getchr() | |
52 | { | |
53 | tty = 2; | |
54 | } | |
55 | ||
56 | /* | |
57 | * Get a character from the keyboard. | |
58 | */ | |
59 | getchr() | |
60 | { | |
61 | char c; | |
62 | int result; | |
63 | ||
64 | do | |
65 | { | |
66 | result = iread(tty, &c, 1); | |
67 | if (result == READ_INTR) | |
68 | return (READ_INTR); | |
69 | if (result < 0) | |
70 | { | |
71 | /* | |
72 | * Don't call error() here, | |
73 | * because error calls getchr! | |
74 | */ | |
75 | quit(); | |
76 | } | |
77 | } while (result != 1); | |
78 | return (c & 0177); | |
79 | } |