/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1995-1998 by Sun Microsystems, Inc.
 * All rights reserved.
 */

/* LINTLIBRARY */

/*
 * wunctrl.c
 *
 * XCurses Library
 *
 * Copyright 1990, 1995 by Mortice Kern Systems Inc.  All rights reserved.
 *
 */

#if M_RCSID
#ifndef lint
static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/wunctrl.c 1.1 "
"1995/05/16 15:15:37 ant Exp $";
#endif
#endif

#include <private.h>

static const wchar_t    *carat[] = {
        L"^?",
        L"^@",
        L"^A",
        L"^B",
        L"^C",
        L"^D",
        L"^E",
        L"^F",
        L"^G",
        L"^H",
        L"^I",
        L"^J",
        L"^K",
        L"^L",
        L"^M",
        L"^N",
        L"^O",
        L"^P",
        L"^Q",
        L"^R",
        L"^S",
        L"^T",
        L"^U",
        L"^V",
        L"^W",
        L"^X",
        L"^Y",
        L"^Z",
        L"^[",
        L"^\\",
        L"^]",
        L"^^",
        L"^_"
};

wchar_t *
wunctrl(cchar_t *cc)
{
        int     i;
        wint_t  wc;
        static wchar_t  wcs[_M_CCHAR_MAX + 1];

        if (cc->_n <= 0)
                return (NULL);

        /* Map wide character to a wide string. */
        wc = cc->_wc[0];
        if (iswcntrl(wc)) {
                if (wc == 127)
                        return ((wchar_t *)carat[0]);
                if (0 <= wc && wc <= 32)
                        return ((wchar_t *)carat[wc+1]);
                return (NULL);
        }

        for (i = 0; i < cc->_n; ++i)
                wcs[i] = cc->_wc[i];
        wcs[i] = L'\0';

        return (wcs);
}