/*      $NetBSD: delwin.c,v 1.22 2021/09/06 07:03:49 rin Exp $  */

/*
 * Copyright (c) 1981, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)delwin.c    8.2 (Berkeley) 5/4/94";
#else
__RCSID("$NetBSD: delwin.c,v 1.22 2021/09/06 07:03:49 rin Exp $");
#endif
#endif                          /* not lint */

#include <stdlib.h>

#include "curses.h"
#include "curses_private.h"

/*
 * delwin --
 *      Delete a window and release it back to the system.
 */
int
delwin(WINDOW *win)
{
        WINDOW *wp, *np;
        struct __winlist *wl, *pwl;
        SCREEN *screen;

        __CTRACE(__CTRACE_WINDOW, "delwin(%p)\n", win);

        if (win == NULL)
                return OK;

        /*
         * Free any storage used by non-spacing characters in the window.
         */
#ifdef HAVE_WCHAR
        __cursesi_win_free_nsp(win);
#endif

        if (win->orig == NULL) {
                /*
                 * If we are the original window, delete the space for all
                 * the subwindows and the window space.
                 */
                free(win->wspace);
                wp = win->nextp;
                while (wp != win) {
                        np = wp->nextp;
                        delwin(wp);
                        wp = np;
                }
                /* Remove ourselves from the list of windows on the screen. */
                pwl = NULL;
                screen = win->screen;
                for (wl = screen->winlistp; wl; pwl = wl, wl = wl->nextp) {
                        if (wl->winp != win)
                                continue;
                        if (pwl != NULL)
                                pwl->nextp = wl->nextp;
                        else
                                screen->winlistp = wl->nextp;
                        free(wl);
                        break;
                }
        } 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->lspace);
        free(win->alines);
        if (win == _cursesi_screen->curscr)
                _cursesi_screen->curscr = NULL;
        if (win == _cursesi_screen->stdscr)
                _cursesi_screen->stdscr = NULL;
        if (win == _cursesi_screen->__virtscr)
                _cursesi_screen->__virtscr = NULL;
        if (win->fp)
                fclose(win->fp);
        free(win->buf);
        free(win);
        return OK;
}