1 /****************************************************************************
2 * Copyright 2020 Thomas E. Dickey *
3 * Copyright 2002-2011,2016 Free Software Foundation, Inc. *
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28 ****************************************************************************/
30 /****************************************************************************
31 * Author: Thomas E. Dickey 2002 *
32 ****************************************************************************/
37 ** The routine unget_wch().
41 #include <curses.priv.h>
43 MODULE_ID("$Id: lib_unget_wch.c,v 1.17 2020/02/02 23:34:34 tom Exp $")
46 * Wrapper for wcrtomb() which obtains the length needed for the given
47 * wide-character 'source'.
49 NCURSES_EXPORT(size_t)
50 _nc_wcrtomb(char *target, wchar_t source, mbstate_t * state)
56 const wchar_t *tempp = temp;
59 result = (int) wcsrtombs(NULL, &tempp, (size_t) 0, state);
61 result = (int) wcrtomb(target, source, state);
63 if (!isEILSEQ(result) && (result == 0))
65 return (size_t) result;
69 NCURSES_SP_NAME(unget_wch) (NCURSES_SP_DCLx const wchar_t wch)
75 T((T_CALLED("unget_wch(%p, %#lx)"), (void *) SP_PARM, (unsigned long) wch));
78 length = _nc_wcrtomb(0, wch, &state);
80 if (length != (size_t) (-1)
84 if ((string = (char *) malloc(length)) != 0) {
88 /* ignore the result, since we already validated the character */
89 IGNORE_RC((int) wcrtomb(string, wch, &state));
91 for (n = (int) (length - 1); n >= 0; --n) {
92 if (NCURSES_SP_NAME(ungetch) (NCURSES_SP_ARGx
93 UChar(string[n])) !=OK) {
111 unget_wch(const wchar_t wch)
113 return NCURSES_SP_NAME(unget_wch) (CURRENT_SCREEN, wch);