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      1 /*	$NetBSD: keywait.c,v 1.3 2025/11/19 09:43:27 nia 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. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <stdio.h>
     31 #include <stdlib.h>
     32 #include <unistd.h>
     33 #include <termios.h>
     34 #include "libtos.h"
     35 
     36 int
     37 key_wait(char *text)
     38 {
     39 	struct termios	term_attr;
     40 	tcflag_t	lfl_orig;
     41 	int		any_key;
     42 	char		c;
     43 
     44 	any_key = (text == NULL);
     45 	if (any_key)
     46 		text = "Press any key...";
     47 
     48 	fprintf(stderr, text);
     49 	fflush(stderr);
     50 
     51 	tcgetattr(STDERR_FILENO, &term_attr);
     52 	lfl_orig = term_attr.c_lflag;
     53 	if (any_key)
     54 		term_attr.c_lflag &= ~ECHO;
     55 	term_attr.c_lflag &= ~ICANON;
     56 	tcsetattr(STDERR_FILENO, TCSAFLUSH, &term_attr);
     57 	read(STDERR_FILENO, &c, 1);
     58 	term_attr.c_lflag = lfl_orig;
     59 	tcsetattr(STDERR_FILENO, TCSAFLUSH, &term_attr);
     60 
     61 	fprintf(stderr, (any_key ? "\r" : "\r\n"));
     62 	fflush(stderr);
     63 	return(c);
     64 }
     65