usr/src/lib/libcurses/id_subwins.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[] = "@(#)id_subwins.c        5.3 (Berkeley) %G%";
#endif /* not lint */

# include       "curses.ext"

/*
 * _id_subwins:
 *      Re-sync the pointers to _y for all the subwindows.
 *
 */
_id_subwins(orig)
register WINDOW *orig;
{
        register WINDOW *win;
        register int    realy;
        register int    y, oy, x;

        realy = orig->_begy + orig->_cury;
        for (win = orig->_nextp; win != orig; win = win->_nextp) {
                /*
                 * If the window ends before our current position,
                 * don't need to do anything.
                 */
                if (win->_begy + win->_maxy <= realy)
                        continue;

                oy = orig->_cury;
                for (y = realy - win->_begy; y < win->_maxy; y++, oy++)
                        win->_y[y] = &orig->_y[oy][win->_ch_off];
        }
}