xref: /illumos-gate/usr/src/lib/libcurses/screen/flushinp.c (revision e3ae4b35c024af1196582063ecee3ab79367227d)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1988 AT&T	*/
28 /*	  All Rights Reserved	*/
29 
30 /*
31  * University Copyright- Copyright (c) 1982, 1986, 1988
32  * The Regents of the University of California
33  * All Rights Reserved
34  *
35  * University Acknowledgment- Portions of this document are derived from
36  * software developed by the University of California, Berkeley, and its
37  * contributors.
38  */
39 
40 /*LINTLIBRARY*/
41 
42 #include	<unistd.h>
43 #include	<sys/types.h>
44 #include	"curses_inc.h"
45 
46 int
47 flushinp(void)
48 {
49 #ifdef	DEBUG
50 	if (outf)
51 		fprintf(outf, "flushinp(), file %x, SP %x\n",
52 		    cur_term->Filedes, SP);
53 #endif	/* DEBUG */
54 
55 #ifdef	SYSV
56 	(void) ioctl(cur_term -> Filedes, TCFLSH, 0);
57 #else	/* SYSV */
58 	/* for insurance against someone using their own buffer: */
59 	(void) ioctl(cur_term -> Filedes, TIOCGETP, &(PROGTTY));
60 
61 	/*
62 	 * SETP waits on output and flushes input as side effect.
63 	 * Really want an ioctl like TCFLSH but Berkeley doesn't have one.
64 	 */
65 	(void) ioctl(cur_term -> Filedes, TIOCSETP, &(PROGTTY));
66 #endif	/* SYSV */
67 
68 	/*
69 	 * Get rid of any typeahead which was read().
70 	 * Leave characters which were ungetch()'d.
71 	 */
72 	cur_term->_chars_on_queue = cur_term->_ungotten;
73 
74 	/*
75 	 * Have to doupdate() because, if we have stopped output due to
76 	 * typeahead, now that typeahead is gone, so we had better catch up.
77 	 */
78 	if (_INPUTPENDING)
79 		(void) doupdate();
80 	return (OK);
81 }
82