projects / unix-history / blame
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|---|---|---|
| bfe13c81 KB |
1 | /* |
| 2 | * Copyright (c) 1988 Mark Nudleman | |
| 3 | * Copyright (c) 1988 Regents of the University of California. | |
| 4 | * All rights reserved. | |
| 5 | * | |
| f15db449 | 6 | * %sccs.include.redist.c% |
| bfe13c81 KB |
7 | */ |
| 8 | ||
| 9 | #ifndef lint | |
| f15db449 | 10 | static char sccsid[] = "@(#)ttyin.c 5.4 (Berkeley) %G%"; |
| bfe13c81 KB |
11 | #endif /* not lint */ |
| 12 | ||
| 13 | /* | |
| 14 | * Routines dealing with getting input from the keyboard (i.e. from the user). | |
| 15 | */ | |
| 16 | ||
| 966c6ec0 | 17 | #include <less.h> |
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18 | |
| 19 | static int tty; | |
| 20 | ||
| 21 | /* | |
| 22 | * Open keyboard for input. | |
| 23 | * (Just use file descriptor 2.) | |
| 24 | */ | |
| bfe13c81 KB |
25 | open_getchr() |
| 26 | { | |
| 27 | tty = 2; | |
| 28 | } | |
| 29 | ||
| 30 | /* | |
| 31 | * Get a character from the keyboard. | |
| 32 | */ | |
| bfe13c81 KB |
33 | getchr() |
| 34 | { | |
| 35 | char c; | |
| 36 | int result; | |
| 37 | ||
| 38 | do | |
| 39 | { | |
| 40 | result = iread(tty, &c, 1); | |
| 41 | if (result == READ_INTR) | |
| 42 | return (READ_INTR); | |
| 43 | if (result < 0) | |
| 44 | { | |
| 45 | /* | |
| 46 | * Don't call error() here, | |
| 47 | * because error calls getchr! | |
| 48 | */ | |
| 49 | quit(); | |
| 50 | } | |
| 51 | } while (result != 1); | |
| 52 | return (c & 0177); | |
| 53 | } |