1 /* $NetBSD: keywait.c,v 1.2 2009/03/14 15:36:04 dsl Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Waldi Ravens. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Waldi Ravens. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <unistd.h> 36 #include <termios.h> 37 #include "libtos.h" 38 39 int 40 key_wait(char *text) 41 { 42 struct termios term_attr; 43 tcflag_t lfl_orig; 44 int any_key; 45 char c; 46 47 any_key = (text == NULL); 48 if (any_key) 49 text = "Press any key..."; 50 51 fprintf(stderr, text); 52 fflush(stderr); 53 54 tcgetattr(STDERR_FILENO, &term_attr); 55 lfl_orig = term_attr.c_lflag; 56 if (any_key) 57 term_attr.c_lflag &= ~ECHO; 58 term_attr.c_lflag &= ~ICANON; 59 tcsetattr(STDERR_FILENO, TCSAFLUSH, &term_attr); 60 read(STDERR_FILENO, &c, 1); 61 term_attr.c_lflag = lfl_orig; 62 tcsetattr(STDERR_FILENO, TCSAFLUSH, &term_attr); 63 64 fprintf(stderr, (any_key ? "\r" : "\r\n")); 65 fflush(stderr); 66 return(c); 67 } 68