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      *
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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 *                                                                          *
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25 * holders shall not be used in advertising or otherwise to promote the     *
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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
43MODULE_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 */
49NCURSES_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
68NCURSES_EXPORT(int)
69NCURSES_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
110NCURSES_EXPORT(int)
111unget_wch(const wchar_t wch)
112{
113    return NCURSES_SP_NAME(unget_wch) (CURRENT_SCREEN, wch);
114}
115#endif
116