1/* $NetBSD: ttyin.c,v 1.4 2003/08/07 09:28:01 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 36static char sccsid[] = "@(#)ttyin.c 8.1 (Berkeley) 6/6/93"; 37#else 38__RCSID("$NetBSD: ttyin.c,v 1.4 2003/08/07 09:28:01 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 51static int tty; 52 53/* 54 * Open keyboard for input. 55 * (Just use file descriptor 2.) 56 */ 57void 58open_getchr() 59{ 60 tty = 2; 61} 62 63/* 64 * Get a character from the keyboard. 65 */ 66int 67getchr() 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