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

# include       "curses.ext"

/*
 *      This routine deletes a window and releases it back to the system.
 *
 */
delwin(win)
reg WINDOW      *win; {

        reg int         i;
        reg WINDOW      *wp, *np;

        if (win->_orig == NULL) {
                /*
                 * If we are the original window, delete the space for
                 * all the subwindows, and the array of space as well.
                 */
                for (i = 0; i < win->_maxy && win->_y[i]; i++)
                        free(win->_y[i]);
                free(win->_firstch);
                free(win->_lastch);
                wp = win->_nextp;
                while (wp != win) {
                        np = wp->_nextp;
                        delwin(wp);
                        wp = np;
                }
        }
        else {
                /*
                 * If we are a subwindow, take ourselves out of the
                 * list.  NOTE: if we are a subwindow, the minimum list
                 * is orig followed by this subwindow, so there are
                 * always at least two windows in the list.
                 */
                for (wp = win->_nextp; wp->_nextp != win; wp = wp->_nextp)
                        continue;
                wp->_nextp = win->_nextp;
        }
        free(win->_y);
        free(win);
}