/*
 * 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 */

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

#ifdef M_RCSID
#ifndef lint
static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/dupwin.c 1.1 "
"1995/05/26 18:41:41 ant Exp $";
#endif
#endif

#include <private.h>
#include <stdlib.h>
#include <string.h>

/*
 * Make an exact duplicate of the window.
 */
WINDOW *
dupwin(WINDOW *w)
{
        int     i;
        WINDOW  *v;

        /* Create (sub)window with same dimensions. */
        v = __m_newwin(w->_parent, w->_maxy, w->_maxx, w->_begy, w->_begx);
        if (v == NULL)
                return (NULL);

        /* Same software scroll region. */
        v->_top = w->_top;
        v->_bottom = w->_bottom;

        /* Same window input settings. */
        v->_vmin = w->_vmin;
        v->_vtime = w->_vtime;

        /* Same window flags. */
        v->_flags = w->_flags;

        /* Copy dirty region markers. */
        (void) memcpy(v->_first, w->_first,
                (v->_maxy + v->_maxy) * sizeof (*v->_first));

        if (v->_parent == NULL) {
                /*
                 * For a regular window, copy source window lines in the
                 * correct order, because the pointers in _line[] may have
                 * been shuffled.  A subwindow is not subject to this,
                 * because it shares its data with its parent window.
                 */
                for (i = 0; i < w->_maxy; ++i) {
                        (void) memcpy(v->_line[i], w->_line[i],
                                v->_maxx * sizeof (**v->_line));
                }
        }

        return (v);
}