1 /* $OpenBSD: lib_get_wch.c,v 1.2 2023/10/17 09:52:09 nicm Exp $ */
2
3 /****************************************************************************
4 * Copyright 2020,2021 Thomas E. Dickey *
5 * Copyright 2002-2011,2016 Free Software Foundation, Inc. *
6 * *
7 * Permission is hereby granted, free of charge, to any person obtaining a *
8 * copy of this software and associated documentation files (the *
9 * "Software"), to deal in the Software without restriction, including *
10 * without limitation the rights to use, copy, modify, merge, publish, *
11 * distribute, distribute with modifications, sublicense, and/or sell *
12 * copies of the Software, and to permit persons to whom the Software is *
13 * furnished to do so, subject to the following conditions: *
14 * *
15 * The above copyright notice and this permission notice shall be included *
16 * in all copies or substantial portions of the Software. *
17 * *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
21 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
24 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
25 * *
26 * Except as contained in this notice, the name(s) of the above copyright *
27 * holders shall not be used in advertising or otherwise to promote the *
28 * sale, use or other dealings in this Software without prior written *
29 * authorization. *
30 ****************************************************************************/
31
32 /****************************************************************************
33 * Author: Thomas E. Dickey 2002-on *
34 ****************************************************************************/
35
36 /*
37 ** lib_get_wch.c
38 **
39 ** The routine get_wch().
40 **
41 */
42
43 #include <curses.priv.h>
44 #include <ctype.h>
45
46 MODULE_ID("$Id: lib_get_wch.c,v 1.2 2023/10/17 09:52:09 nicm Exp $")
47
NCURSES_EXPORT(int)48 NCURSES_EXPORT(int)
49 wget_wch(WINDOW *win, wint_t *result)
50 {
51 SCREEN *sp;
52 int code;
53 int value = 0;
54 #ifndef state_unused
55 mbstate_t state;
56 #endif
57
58 T((T_CALLED("wget_wch(%p)"), (void *) win));
59
60 /*
61 * We can get a stream of single-byte characters and KEY_xxx codes from
62 * _nc_wgetch(), while we want to return a wide character or KEY_xxx code.
63 */
64 _nc_lock_global(curses);
65 sp = _nc_screen_of(win);
66
67 if (sp != 0) {
68 size_t count = 0;
69
70 for (;;) {
71 char buffer[(MB_LEN_MAX * 9) + 1]; /* allow some redundant shifts */
72
73 T(("reading %d of %d", (int) count + 1, (int) sizeof(buffer)));
74 code = _nc_wgetch(win, &value, TRUE EVENTLIST_2nd((_nc_eventlist
75 *) 0));
76 if (code == ERR) {
77 break;
78 } else if (code == KEY_CODE_YES) {
79 /*
80 * If we were processing an incomplete multibyte character,
81 * return an error since we have a KEY_xxx code which
82 * interrupts it. For some cases, we could improve this by
83 * writing a new version of lib_getch.c(!), but it is not clear
84 * whether the improvement would be worth the effort.
85 */
86 if (count != 0) {
87 safe_ungetch(SP_PARM, value);
88 code = ERR;
89 }
90 break;
91 } else if (count + 1 >= sizeof(buffer)) {
92 safe_ungetch(SP_PARM, value);
93 code = ERR;
94 break;
95 } else {
96 int status;
97
98 buffer[count++] = (char) UChar(value);
99 reset_mbytes(state);
100 status = count_mbytes(buffer, count, state);
101 if (status >= 0) {
102 wchar_t wch;
103 reset_mbytes(state);
104 if (check_mbytes(wch, buffer, count, state) != status) {
105 code = ERR; /* the two calls should match */
106 safe_ungetch(SP_PARM, value);
107 }
108 value = wch;
109 break;
110 }
111 }
112 }
113 } else {
114 code = ERR;
115 }
116
117 if (result != 0)
118 *result = (wint_t) value;
119
120 _nc_unlock_global(curses);
121 T(("result %#o", value));
122 returnCode(code);
123 }
124