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clrtobot.c revision 1.12 
      1 /*	$NetBSD: clrtobot.c,v 1.12 2000/04/15 13:17:03 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)clrtobot.c	8.2 (Berkeley) 5/4/94";
     40 #else
     41 __RCSID("$NetBSD: clrtobot.c,v 1.12 2000/04/15 13:17:03 blymn Exp $");
     42 #endif
     43 #endif				/* not lint */
     44 
     45 #include "curses.h"
     46 #include "curses_private.h"
     47 
     48 #ifndef _CURSES_USE_MACROS
     49 
     50 /*
     51  * clrtobot --
     52  *	Erase everything on stdscr.
     53  */
     54 int
     55 clrtobot(void)
     56 {
     57 	return wclrtobot(stdscr);
     58 }
     59 
     60 #endif
     61 
     62 /*
     63  * wclrtobot --
     64  *	Erase everything on the window.
     65  */
     66 int
     67 wclrtobot(WINDOW *win)
     68 {
     69 	int	 minx, startx, starty, y;
     70 	__LDATA	*sp, *end, *maxx;
     71 
     72 #ifdef __GNUC__
     73 	maxx = NULL;		/* XXX gcc -Wuninitialized */
     74 #endif
     75 	if (win->lines[win->cury]->flags & __ISPASTEOL) {
     76 		starty = win->cury + 1;
     77 		startx = 0;
     78 	} else {
     79 		starty = win->cury;
     80 		startx = win->curx;
     81 	}
     82 	for (y = starty; y < win->maxy; y++) {
     83 		minx = -1;
     84 		end = &win->lines[y]->line[win->maxx];
     85 		for (sp = &win->lines[y]->line[startx]; sp < end; sp++)
     86 			if (sp->ch != ' ' || sp->attr != 0) {
     87 				maxx = sp;
     88 				if (minx == -1)
     89 					minx = sp - win->lines[y]->line;
     90 				sp->ch = ' ';
     91 				sp->attr = 0;
     92 			}
     93 		if (minx != -1)
     94 			__touchline(win, y, minx, maxx - win->lines[y]->line,
     95 			    0);
     96 		startx = 0;
     97 	}
     98 	return (OK);
     99 }
    100