xref: /titanic_51/usr/src/lib/libcurses/screen/ungetwch.c (revision 37714ae43602c675f9dc59b070bfdf9fa702872c)
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 /*  Copyright (c) 1988 AT&T */
23 /*    All Rights Reserved   */
24 
25 
26 /*
27  *      Copyright (c) 1997, by Sun Microsystems, Inc.
28  *      All rights reserved.
29  */
30 
31 #pragma ident	"%Z%%M%	%I%	%E% SMI"
32 
33 /*LINTLIBRARY*/
34 
35 #include	<sys/types.h>
36 #include	"curses_inc.h"
37 
38 /*
39  *	Push a process code back into the input stream
40  */
41 
42 int
43 ungetwch(wchar_t code)
44 {
45 	int	i, n;
46 	char	buf[CSMAX];
47 
48 	n = _curs_wctomb(buf, code & TRIM);
49 	for (i = n - 1; i >= 0; --i)
50 		if (ungetch((unsigned char)buf[i]) == ERR) {
51 			/* remove inserted characters */
52 			for (i = i + 1; i < n; ++i)
53 				(void) tgetch(0);
54 			return (ERR);
55 		}
56 
57 	return (OK);
58 }
59