usr/src/usr.lib/libcurses/scroll.c

/*
 * Copyright (c) 1981 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)scroll.c    5.3 (Berkeley) 6/30/88";
#endif /* not lint */

# include       "curses.ext"

/*
 *      This routine scrolls the window up a line.
 *
 */
scroll(win)
register  WINDOW        *win;
{
        register int    oy, ox;

# ifdef DEBUG
        fprintf(outf, "SCROLL(%0.2o)\n", win);
# endif

        if (!win->_scroll)
                return ERR;

        getyx(win, oy, ox);
        wmove(win, 0, 0);
        wdeleteln(win);
        wmove(win, oy, ox);

        if (win == curscr) {
                _putchar('\n');
                if (!NONL)
                        win->_curx = 0;
# ifdef DEBUG
                fprintf(outf, "SCROLL: win == curscr\n");
# endif
        }
}