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      1 /*	$NetBSD: clrtobot.c,v 1.32 2024/12/23 02:58:03 blymn 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[] = "@(#)clrtobot.c	8.2 (Berkeley) 5/4/94";
     36 #else
     37 __RCSID("$NetBSD: clrtobot.c,v 1.32 2024/12/23 02:58:03 blymn Exp $");
     38 #endif
     39 #endif				/* not lint */
     40 
     41 #include <stdlib.h>
     42 #include "curses.h"
     43 #include "curses_private.h"
     44 
     45 #ifndef _CURSES_USE_MACROS
     46 
     47 /*
     48  * clrtobot --
     49  *	Erase everything on stdscr.
     50  */
     51 int
     52 clrtobot(void)
     53 {
     54 	return wclrtobot(stdscr);
     55 }
     56 
     57 #endif
     58 
     59 /*
     60  * wclrtobot --
     61  *	Erase everything on the window.
     62  */
     63 int
     64 wclrtobot(WINDOW *win)
     65 {
     66 	int	 minx, startx, starty, y;
     67 	__LDATA	*sp, *end, *maxx;
     68 	wchar_t bch;
     69 	attr_t	battr;
     70 
     71 	if (__predict_false(win == NULL))
     72 		return ERR;
     73 
     74 	bch = win->bch;
     75 	if (win != curscr)
     76 		battr = win->battr & __ATTRIBUTES;
     77 	else
     78 		battr = 0;
     79 
     80 #ifdef __GNUC__
     81 	maxx = NULL;		/* XXX gcc -Wuninitialized */
     82 #endif
     83 	if (win->alines[win->cury]->flags & __ISPASTEOL) {
     84 		starty = win->cury + 1;
     85 		startx = 0;
     86 	} else {
     87 		starty = win->cury;
     88 		startx = win->curx;
     89 	}
     90 
     91 	for (y = starty; y < win->maxy; y++) {
     92 		minx = -1;
     93 		end = &win->alines[y]->line[win->maxx];
     94 		for (sp = &win->alines[y]->line[startx]; sp < end; sp++) {
     95 			if (!(__NEED_ERASE(sp, bch, battr)))
     96 				continue;
     97 
     98 			maxx = sp;
     99 			if (minx == -1)
    100 				minx = (int)(sp - win->alines[y]->line);
    101 
    102 			sp->ch = bch;
    103 			sp->cflags |= CA_BACKGROUND;
    104 			sp->cflags &= CA_CONTINUATION;
    105 			sp->attr = battr | (sp->attr & __ALTCHARSET);
    106 #ifdef HAVE_WCHAR
    107 			if (_cursesi_copy_nsp(win->bnsp, sp) == ERR)
    108 				return ERR;
    109 			sp->wcols = 1;
    110 #endif
    111 		}
    112 
    113 		if (minx != -1)
    114 			__touchline(win, y, minx,
    115 				    (int)(maxx - win->alines[y]->line));
    116 		startx = 0;
    117 	}
    118 
    119 	__sync(win);
    120 	return OK;
    121 }
    122