libcurses/screen/wscrl.c

	wscrl.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * 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.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*LINTLIBRARY*/

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

/* Scroll the given window up/down n lines. */
int
wscrl(WINDOW *win, int n)
{
    short   curx, cury;
    bool     savimmed, savsync;

#ifdef  DEBUG
    if (outf)
        if (win == stdscr)
            fprintf(outf, "scroll(stdscr, %d)\n", n);
        else
            if (win == curscr)
                fprintf(outf, "scroll(curscr, %d)\n", n);
            else
                fprintf(outf, "scroll(%x, %d)\n", win, n);
#endif  /* DEBUG */
    if (!win->_scroll || (win->_flags & _ISPAD))
        return (ERR);

    savimmed = win->_immed;
    savsync = win->_sync;
    win->_immed = win->_sync = FALSE;

    curx = win->_curx; cury = win->_cury;

    if (cury >= win->_tmarg && cury <= win->_bmarg)
        win->_cury = win->_tmarg;
    else
        win->_cury = 0;

    (void) winsdelln(win, -n);
    win->_curx = curx;
    win->_cury = cury;

    win->_sync = savsync;

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

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