lib_unget_wch.c revision 97049 
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2 * Copyright (c) 2002 Free Software Foundation, Inc.                        *
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28
29/****************************************************************************
30 *  Author: Thomas E. Dickey 2002                                           *
31 ****************************************************************************/
32
33/*
34**	lib_unget_wch.c
35**
36**	The routine unget_wch().
37**
38*/
39
40#include <curses.priv.h>
41
42MODULE_ID("$Id: lib_unget_wch.c,v 1.2 2002/03/17 00:01:38 tom Exp $")
43
44NCURSES_EXPORT(int)
45unget_wch(const wchar_t wch)
46{
47    int result = OK;
48    mbstate_t state;
49    size_t length;
50    int n;
51
52    T((T_CALLED("unget_wch(%d)"), wch));
53
54    memset(&state, 0, sizeof(state));
55    length = wcrtomb(0, wch, &state);
56
57    if (length != (size_t) (-1)
58	&& length != 0) {
59	char *string = malloc(length);
60
61	memset(&state, 0, sizeof(state));
62	wcrtomb(string, wch, &state);
63
64	for (n = (int) (length - 1); n >= 0; --n) {
65	    if (ungetch(string[n]) != OK) {
66		result = ERR;
67		break;
68	    }
69	}
70	free(string);
71    } else {
72	result = ERR;
73    }
74
75    returnCode(result);
76}
77