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