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gerrit.omnirom.org / android_external_libncurses / c1bcd6dd9af6865867a3d6716e4c1a45021a90e5 / . / ncurses / widechar / lib_get_wch.c
blob: 6cf3129f2d18f962a0f4efaf14287056584db1d8 [file] [log] [blame]
Amit Daniel Kachhape6a01f52011-07-20 11:45:59 +0530[diff] [blame]1/****************************************************************************
2 * Copyright (c) 2002-2007,2008 Free Software Foundation, Inc. *
3 * *
4 * Permission is hereby granted, free of charge, to any person obtaining a *
5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
7 * without limitation the rights to use, copy, modify, merge, publish, *
8 * distribute, distribute with modifications, sublicense, and/or sell *
9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
11 * *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
14 * *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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23 * Except as contained in this notice, the name(s) of the above copyright *
24 * holders shall not be used in advertising or otherwise to promote the *
25 * sale, use or other dealings in this Software without prior written *
26 * authorization. *
27 ****************************************************************************/
28
29/****************************************************************************
30 * Author: Thomas E. Dickey 2002-on *
31 ****************************************************************************/
32
33/*
34** lib_get_wch.c
35**
36** The routine get_wch().
37**
38*/
39
40#include <curses.priv.h>
41#include <ctype.h>
42
43MODULE_ID("$Id: lib_get_wch.c,v 1.17 2008/08/16 19:22:55 tom Exp $")
44
45#if HAVE_MBTOWC && HAVE_MBLEN
46#define reset_mbytes(state) mblen(NULL, 0), mbtowc(NULL, NULL, 0)
47#define count_mbytes(buffer,length,state) mblen(buffer,length)
48#define check_mbytes(wch,buffer,length,state) \
49 (int) mbtowc(&wch, buffer, length)
50#define state_unused
51#elif HAVE_MBRTOWC && HAVE_MBRLEN
52#define reset_mbytes(state) init_mb(state)
53#define count_mbytes(buffer,length,state) mbrlen(buffer,length,&state)
54#define check_mbytes(wch,buffer,length,state) \
55 (int) mbrtowc(&wch, buffer, length, &state)
56#else
57make an error
58#endif
59
60NCURSES_EXPORT(int)
61wget_wch(WINDOW *win, wint_t *result)
62{
63 SCREEN *sp;
64 int code;
65 char buffer[(MB_LEN_MAX * 9) + 1]; /* allow some redundant shifts */
66 int status;
67 size_t count = 0;
68 unsigned long value;
69 wchar_t wch;
70#ifndef state_unused
71 mbstate_t state;
72#endif
73
74 T((T_CALLED("wget_wch(%p)"), win));
75
76 /*
77 * We can get a stream of single-byte characters and KEY_xxx codes from
78 * _nc_wgetch(), while we want to return a wide character or KEY_xxx code.
79 */
80 _nc_lock_global(curses);
81 sp = _nc_screen_of(win);
82 if (sp != 0) {
83 for (;;) {
84 T(("reading %d of %d", (int) count + 1, (int) sizeof(buffer)));
85 code = _nc_wgetch(win, &value, TRUE EVENTLIST_2nd((_nc_eventlist
86 *) 0));
87 if (code == ERR) {
88 break;
89 } else if (code == KEY_CODE_YES) {
90 /*
91 * If we were processing an incomplete multibyte character,
92 * return an error since we have a KEY_xxx code which
93 * interrupts it. For some cases, we could improve this by
94 * writing a new version of lib_getch.c(!), but it is not clear
95 * whether the improvement would be worth the effort.
96 */
97 if (count != 0) {
98 _nc_ungetch(sp, (int) value);
99 code = ERR;
100 }
101 break;
102 } else if (count + 1 >= sizeof(buffer)) {
103 _nc_ungetch(sp, (int) value);
104 code = ERR;
105 break;
106 } else {
107 buffer[count++] = (char) UChar(value);
108 reset_mbytes(state);
109 status = count_mbytes(buffer, count, state);
110 if (status >= 0) {
111 reset_mbytes(state);
112 if (check_mbytes(wch, buffer, count, state) != status) {
113 code = ERR; /* the two calls should match */
114 _nc_ungetch(sp, (int) value);
115 }
116 value = wch;
117 break;
118 }
119 }
120 }
121 } else {
122 code = ERR;
123 }
124 *result = value;
125 _nc_unlock_global(curses);
126 T(("result %#lo", value));
127 returnCode(code);
128}