1 /****************************************************************************
2 * Copyright 2020 Thomas E. Dickey *
3 * Copyright 2002-2011,2016 Free Software Foundation, Inc. *
4 * *
5 * Permission is hereby granted, free of charge, to any person obtaining a *
6 * copy of this software and associated documentation files (the *
7 * "Software"), to deal in the Software without restriction, including *
8 * without limitation the rights to use, copy, modify, merge, publish, *
9 * distribute, distribute with modifications, sublicense, and/or sell *
10 * copies of the Software, and to permit persons to whom the Software is *
11 * furnished to do so, subject to the following conditions: *
12 * *
13 * The above copyright notice and this permission notice shall be included *
14 * in all copies or substantial portions of the Software. *
15 * *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
23 * *
24 * Except as contained in this notice, the name(s) of the above copyright *
25 * holders shall not be used in advertising or otherwise to promote the *
26 * sale, use or other dealings in this Software without prior written *
27 * authorization. *
28 ****************************************************************************/
29
30 /****************************************************************************
31 * Author: Thomas E. Dickey 2002 *
32 ****************************************************************************/
33
34 /*
35 ** lib_unget_wch.c
36 **
37 ** The routine unget_wch().
38 **
39 */
40
41 #include <curses.priv.h>
42
43 MODULE_ID("$Id: lib_unget_wch.c,v 1.17 2020/02/02 23:34:34 tom Exp $")
44
45 /*
46 * Wrapper for wcrtomb() which obtains the length needed for the given
47 * wide-character 'source'.
48 */
NCURSES_EXPORT(size_t)49 NCURSES_EXPORT(size_t)
50 _nc_wcrtomb(char *target, wchar_t source, mbstate_t * state)
51 {
52 int result;
53
54 if (target == 0) {
55 wchar_t temp[2];
56 const wchar_t *tempp = temp;
57 temp[0] = source;
58 temp[1] = 0;
59 result = (int) wcsrtombs(NULL, &tempp, (size_t) 0, state);
60 } else {
61 result = (int) wcrtomb(target, source, state);
62 }
63 if (!isEILSEQ(result) && (result == 0))
64 result = 1;
65 return (size_t) result;
66 }
67
68 NCURSES_EXPORT(int)
NCURSES_SP_NAME(unget_wch)69 NCURSES_SP_NAME(unget_wch) (NCURSES_SP_DCLx const wchar_t wch)
70 {
71 int result = OK;
72 mbstate_t state;
73 size_t length;
74
75 T((T_CALLED("unget_wch(%p, %#lx)"), (void *) SP_PARM, (unsigned long) wch));
76
77 init_mb(state);
78 length = _nc_wcrtomb(0, wch, &state);
79
80 if (length != (size_t) (-1)
81 && length != 0) {
82 char *string;
83
84 if ((string = (char *) malloc(length)) != 0) {
85 int n;
86
87 init_mb(state);
88 /* ignore the result, since we already validated the character */
89 IGNORE_RC((int) wcrtomb(string, wch, &state));
90
91 for (n = (int) (length - 1); n >= 0; --n) {
92 if (NCURSES_SP_NAME(ungetch) (NCURSES_SP_ARGx
93 UChar(string[n])) !=OK) {
94 result = ERR;
95 break;
96 }
97 }
98 free(string);
99 } else {
100 result = ERR;
101 }
102 } else {
103 result = ERR;
104 }
105
106 returnCode(result);
107 }
108
109 #if NCURSES_SP_FUNCS
110 NCURSES_EXPORT(int)
unget_wch(const wchar_t wch)111 unget_wch(const wchar_t wch)
112 {
113 return NCURSES_SP_NAME(unget_wch) (CURRENT_SCREEN, wch);
114 }
115 #endif
116