projects / unix-history / blame
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1 | /* |
| 2 | * Copyright (c) 1988 Mark Nudleman | |
| 3 | * Copyright (c) 1988 Regents of the University of California. | |
| 4 | * All rights reserved. | |
| 5 | * | |
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6 | * Redistribution and use in source and binary forms are permitted |
| 7 | * provided that the above copyright notice and this paragraph are | |
| 8 | * duplicated in all such forms and that any documentation, | |
| 9 | * advertising materials, and other materials related to such | |
| 10 | * distribution and use acknowledge that the software was developed | |
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11 | * by Mark Nudleman and the University of California, Berkeley. The |
| 12 | * name of Mark Nudleman or the | |
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13 | * University may not be used to endorse or promote products derived |
| 14 | * from this software without specific prior written permission. | |
| 15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
| 16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
| 17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
| 18 | */ | |
| 19 | ||
| 20 | #ifndef lint | |
| a942b40b | 21 | static char sccsid[] = "@(#)ttyin.c 5.2 (Berkeley) %G%"; |
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22 | #endif /* not lint */ |
| 23 | ||
| 24 | /* | |
| 25 | * Routines dealing with getting input from the keyboard (i.e. from the user). | |
| 26 | */ | |
| 27 | ||
| 28 | #include "less.h" | |
| 29 | ||
| 30 | static int tty; | |
| 31 | ||
| 32 | /* | |
| 33 | * Open keyboard for input. | |
| 34 | * (Just use file descriptor 2.) | |
| 35 | */ | |
| 36 | public void | |
| 37 | open_getchr() | |
| 38 | { | |
| 39 | tty = 2; | |
| 40 | } | |
| 41 | ||
| 42 | /* | |
| 43 | * Get a character from the keyboard. | |
| 44 | */ | |
| 45 | public int | |
| 46 | getchr() | |
| 47 | { | |
| 48 | char c; | |
| 49 | int result; | |
| 50 | ||
| 51 | do | |
| 52 | { | |
| 53 | result = iread(tty, &c, 1); | |
| 54 | if (result == READ_INTR) | |
| 55 | return (READ_INTR); | |
| 56 | if (result < 0) | |
| 57 | { | |
| 58 | /* | |
| 59 | * Don't call error() here, | |
| 60 | * because error calls getchr! | |
| 61 | */ | |
| 62 | quit(); | |
| 63 | } | |
| 64 | } while (result != 1); | |
| 65 | return (c & 0177); | |
| 66 | } |