charable.c

ncurses-5.4

/****************************************************************************
 * Copyright (c) 2003 Free Software Foundation, Inc.                        *
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/*
**	Support functions for wide/narrow conversion.
*/

#include <curses.priv.h>

MODULE_ID("$Id: charable.c,v 1.2 2003/07/05 18:04:08 tom Exp $")

NCURSES_EXPORT(bool) _nc_is_charable(wchar_t ch)
{
    bool result;
#if HAVE_WCTOB
    result = (wctob(ch) == ch);
#else
    result = (_nc_to_char(ch) >= 0);
#endif
    return result;
}

NCURSES_EXPORT(int) _nc_to_char(wint_t ch)
{
    int result;
#if HAVE_WCTOB
    result = wctob(ch);
#elif HAVE_WCTOMB
    char temp[MB_LEN_MAX];
    result = wctomb(temp, ch);
    if (strlen(temp) == 1)
	result = UChar(temp[0]);
    else
	result = -1;
#endif
    return result;
}

NCURSES_EXPORT(wint_t) _nc_to_widechar(int ch)
{
    wint_t result;
#if HAVE_BTOWC
    result = btowc(ch);
#elif HAVE_MBTOWC
    char temp[2];
    temp[0] = ch;
    temp[1] = '\0';
    if (mbtowc((wchar_t *) (&result), temp, 1) != 1)
	result = WEOF;
#endif
    return result;
}