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delwin.c revision 1.20 
      1 /*	$NetBSD: delwin.c,v 1.20 2017/01/06 13:53:18 roy 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 1.20 2017/01/06 13:53:18 roy 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 #ifdef DEBUG
     58 	__CTRACE(__CTRACE_WINDOW, "delwin(%p)\n", win);
     59 #endif
     60 
     61 	if (win == NULL)
     62 		return OK;
     63 
     64 	/*
     65 	 * Free any storage used by non-spacing characters in the window.
     66 	 */
     67 #ifdef HAVE_WCHAR
     68 	__cursesi_win_free_nsp(win);
     69 #endif
     70 
     71 	if (win->orig == NULL) {
     72 		/*
     73 		 * If we are the original window, delete the space for all
     74 		 * the subwindows and the window space.
     75 		 */
     76 		free(win->wspace);
     77 		wp = win->nextp;
     78 		while (wp != win) {
     79 			np = wp->nextp;
     80 			delwin(wp);
     81 			wp = np;
     82 		}
     83 		/* Remove ourselves from the list of windows on the screen. */
     84 		pwl = NULL;
     85 		screen = win->screen;
     86 		for (wl = screen->winlistp; wl; pwl = wl, wl = wl->nextp) {
     87 			if (wl->winp != win)
     88 				continue;
     89 			if (pwl != NULL)
     90 				pwl->nextp = wl->nextp;
     91 			else
     92 				screen->winlistp = wl->nextp;
     93 			free(wl);
     94 			break;
     95 		}
     96 	} else {
     97 		/*
     98 		 * If we are a subwindow, take ourselves out of the list.
     99 		 * NOTE: if we are a subwindow, the minimum list is orig
    100 		 * followed by this subwindow, so there are always at least
    101 		 * two windows in the list.
    102 		 */
    103 		for (wp = win->nextp; wp->nextp != win; wp = wp->nextp)
    104 			continue;
    105 		wp->nextp = win->nextp;
    106 	}
    107 	free(win->lspace);
    108 	free(win->alines);
    109 	if (win == _cursesi_screen->curscr)
    110 		_cursesi_screen->curscr = NULL;
    111 	if (win == _cursesi_screen->stdscr)
    112 		_cursesi_screen->stdscr = NULL;
    113 	if (win == _cursesi_screen->__virtscr)
    114 		_cursesi_screen->__virtscr = NULL;
    115 	if (win->fp)
    116 		fclose(win->fp);
    117 	free(win);
    118 	return OK;
    119 }
    120