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#pragma ident	"%Z%%M%	%I%	%E% SMI"
41
42/*LINTLIBRARY*/
43
44#include <sys/types.h>
45#include "curses_inc.h"
46
47/* Place a char onto the beginning of the input queue. */
48
49int
50ungetch(int ch)
51{
52	int	i = cur_term->_chars_on_queue, j = i - 1;
53	chtype	*inputQ = cur_term->_input_queue;
54
55	/* Place the character at the beg of the Q */
56	/*
57	 * Here is commented out because 'ch' should deal with a single byte
58	 * character only. So ISCBIT(ch) is 0 every time.
59	 *
60	 * register chtype	r;
61	 *
62	 * if (ISCBIT(ch)) {
63	 *	r = RBYTE(ch);
64	 *	ch = LBYTE(ch);
65	 *	-* do the right half first to maintain the byte order *-
66	 *	if (r != MBIT && ungetch(r) == ERR)
67	 *		return (ERR);
68	 * }
69	 */
70
71	while (i > 0)
72		inputQ[i--] = inputQ[j--];
73	cur_term->_ungotten++;
74	inputQ[0] = -ch;
75	cur_term->_chars_on_queue++;
76	return (0);
77}
78