/*
 * 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 1997 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1988 AT&T */
/*        All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

/*LINTLIBRARY*/

#include        <sys/types.h>
#include        "curses_inc.h"

/*
 * This routine performs a delete-char on the line,
 * leaving (_cury, _curx) unchanged.
 */

int
wdelch(WINDOW *win)
{
        chtype  *temp1, *temp2;
        chtype  *end;
        int     cury = win->_cury;
        short   curx = win->_curx;
        chtype  *cp;
        int     s;

        end = &win->_y[cury][win->_maxx - 1];
        temp2 = &win->_y[cury][curx + 1];
        temp1 = temp2 - 1;

        s = 1;
        win->_nbyte = -1;
        if (_scrmax > 1) {
                if (ISMBIT(*temp1)) {
                        win->_insmode = TRUE;
                        if (_mbvalid(win) == ERR)
                                return (ERR);
                        curx = win->_curx;
                        temp1 = &win->_y[cury][curx];
                }
                if (ISMBIT(*end)) {
                        for (cp = end; cp >= temp1; --cp)
                                if (!ISCBIT(*cp))
                                        break;
                        if (cp + _curs_scrwidth[TYPE(*cp)] > end+1)
                                end = cp - 1;
                }
                if (ISMBIT(*temp1))
                        s = _curs_scrwidth[TYPE(RBYTE(*temp1))];
                end -= s - 1;
                temp2 = &win->_y[cury][curx+s];
        }

        while (temp1 < end)
                *temp1++ = *temp2++;

        while (s--)
                *temp1++ = win->_bkgd;

#ifdef  _VR3_COMPAT_CODE
        if (_y16update)
                (*_y16update)(win, 1, win->_maxx - curx, cury, curx);
#endif  /* _VR3_COMPAT_CODE */

        win->_lastch[cury] = win->_maxx - 1;
        if (win->_firstch[cury] > curx)
                win->_firstch[cury] = curx;

        win->_flags |= _WINCHANGED;

        if (win->_sync)
                wsyncup(win);

        return (win->_immed ? wrefresh(win) : OK);
}