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      1 /*	$NetBSD: delwin.c,v 1.22 2021/09/06 07:03:49 rin Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1981, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)delwin.c	8.2 (Berkeley) 5/4/94";
     36 #else
     37 __RCSID("$NetBSD: delwin.c,v 1.22 2021/09/06 07:03:49 rin Exp $");
     38 #endif
     39 #endif				/* not lint */
     40 
     41 #include <stdlib.h>
     42 
     43 #include "curses.h"
     44 #include "curses_private.h"
     45 
     46 /*
     47  * delwin --
     48  *	Delete a window and release it back to the system.
     49  */
     50 int
     51 delwin(WINDOW *win)
     52 {
     53 	WINDOW *wp, *np;
     54 	struct __winlist *wl, *pwl;
     55 	SCREEN *screen;
     56 
     57 	__CTRACE(__CTRACE_WINDOW, "delwin(%p)\n", win);
     58 
     59 	if (win == NULL)
     60 		return OK;
     61 
     62 	/*
     63 	 * Free any storage used by non-spacing characters in the window.
     64 	 */
     65 #ifdef HAVE_WCHAR
     66 	__cursesi_win_free_nsp(win);
     67 #endif
     68 
     69 	if (win->orig == NULL) {
     70 		/*
     71 		 * If we are the original window, delete the space for all
     72 		 * the subwindows and the window space.
     73 		 */
     74 		free(win->wspace);
     75 		wp = win->nextp;
     76 		while (wp != win) {
     77 			np = wp->nextp;
     78 			delwin(wp);
     79 			wp = np;
     80 		}
     81 		/* Remove ourselves from the list of windows on the screen. */
     82 		pwl = NULL;
     83 		screen = win->screen;
     84 		for (wl = screen->winlistp; wl; pwl = wl, wl = wl->nextp) {
     85 			if (wl->winp != win)
     86 				continue;
     87 			if (pwl != NULL)
     88 				pwl->nextp = wl->nextp;
     89 			else
     90 				screen->winlistp = wl->nextp;
     91 			free(wl);
     92 			break;
     93 		}
     94 	} else {
     95 		/*
     96 		 * If we are a subwindow, take ourselves out of the list.
     97 		 * NOTE: if we are a subwindow, the minimum list is orig
     98 		 * followed by this subwindow, so there are always at least
     99 		 * two windows in the list.
    100 		 */
    101 		for (wp = win->nextp; wp->nextp != win; wp = wp->nextp)
    102 			continue;
    103 		wp->nextp = win->nextp;
    104 	}
    105 	free(win->lspace);
    106 	free(win->alines);
    107 	if (win == _cursesi_screen->curscr)
    108 		_cursesi_screen->curscr = NULL;
    109 	if (win == _cursesi_screen->stdscr)
    110 		_cursesi_screen->stdscr = NULL;
    111 	if (win == _cursesi_screen->__virtscr)
    112 		_cursesi_screen->__virtscr = NULL;
    113 	if (win->fp)
    114 		fclose(win->fp);
    115 	free(win->buf);
    116 	free(win);
    117 	return OK;
    118 }
    119