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 (c) 1995, by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * wget_wch.c
31 *
32 * XCurses Library
33 *
34 * Copyright 1990, 1995 by Mortice Kern Systems Inc. All rights reserved.
35 *
36 */
37
38 #ifdef M_RCSID
39 #ifndef lint
40 static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/wget_wch.c 1.2 1995/06/08 19:00:47 ant Exp $";
41 #endif
42 #endif
43
44 #include <private.h>
45 #include <m_wio.h>
46 #include <stdlib.h>
47
48 /*
49 * Push a wide character back onto the input queue.
50 *
51 * XPG4 is silent as to whether wget_wch() and wgetch()
52 * can both be used in an applicaton. Assume they can,
53 * in which case we have to push the multibyte equivalent
54 * back onto the input queue.
55 */
56 int
unget_wch(const wchar_t wc)57 unget_wch(const wchar_t wc)
58 {
59 int i, len;
60 char mb[MB_LEN_MAX];
61
62 #ifdef M_CURSES_TRACE
63 __m_trace("unget_wch(%ld)", (long) wc);
64 #endif
65
66 if (!ISEMPTY() || (len = wctomb(mb, wc)) < 0)
67 return __m_return_code("unget_wch", ERR);
68
69 for (i = 0; i < len; ++i)
70 PUSH(mb[i]);
71
72 return __m_return_code("unget_wch", OK);
73 }
74
75 int
wget_wch(w,wcp)76 wget_wch(w, wcp)
77 WINDOW *w;
78 wint_t *wcp;
79 {
80 cchar_t cc;
81 int ch, oecho;
82 t_wide_io *wio;
83
84 #ifdef M_CURSES_TRACE
85 __m_trace("wget_wch(%p, %p)", w, wcp);
86 #endif
87
88 /* Disable echo temporarily, because we're using
89 * wgetch() to read in individual bytes and only
90 * want echo the resulting character, not the
91 * individual bytes composing the character.
92 */
93 oecho = __m_set_echo(0);
94
95 /* Input function is wgetch(), which takes a WINDOW * for
96 * a parameter. The WINDOW * is used to set the "focus" by
97 * updatng and position the cursor in the relevant window and
98 * provide window specific settings. Input for all windows
99 * comes from one stream (__m_screen->_if), which is normally
100 * the terminal, but can be redirected.
101 */
102 wio = (t_wide_io *) __m_screen->_in;
103 wio->object = w;
104
105 /* Get the first byte or KEY_ value. */
106 if ((ch = wgetch(w)) < __KEY_BASE) {
107 *wcp = ch;
108 (void) __m_set_echo(oecho);
109 return __m_return_code("wget_wch", KEY_CODE_YES);
110 }
111
112 /* Push the byte back onto the input stream so that
113 * it can be processed by __m_wio_get().
114 */
115 (void) ungetc(ch, __m_screen->_if);
116
117 /* Fetch a wide character from a narrow input stream.
118 * Invalid sequences are preserved as individual bytes.
119 * Handles insignificant and redundant shifts in the input
120 * stream.
121 */
122 *wcp = m_wio_get(wio);
123
124 /* Restore echo. */
125 (void) __m_set_echo(oecho);
126
127 /* Push any invalid multibyte sequence back onto the
128 * input stack, so that no data is lost, just in case
129 * the application mixes wide (wget_wch()) and narrow
130 * (wgetch()) input methods.
131 */
132 while (wio->_next < wio->_size)
133 PUSH(wio->_mb[--wio->_size]);
134
135 /* Now echo wide character if necessary. */
136 if ((__m_screen->_flags & S_ECHO) && *wcp != WEOF) {
137 (void) __m_wc_cc(*wcp, &cc);
138 (void) wadd_wch(w, &cc);
139 (void) wrefresh(w);
140 }
141
142 return __m_return_code("wget_wch", OK);
143 }
144