clrtobot.c revision 1.17 
1/*	$NetBSD: clrtobot.c,v 1.17 2006/01/26 07:26:37 jdc 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
35static char sccsid[] = "@(#)clrtobot.c	8.2 (Berkeley) 5/4/94";
36#else
37__RCSID("$NetBSD: clrtobot.c,v 1.17 2006/01/26 07:26:37 jdc Exp $");
38#endif
39#endif				/* not lint */
40
41#include "curses.h"
42#include "curses_private.h"
43
44#ifndef _CURSES_USE_MACROS
45
46/*
47 * clrtobot --
48 *	Erase everything on stdscr.
49 */
50int
51clrtobot(void)
52{
53	return wclrtobot(stdscr);
54}
55
56#endif
57
58/*
59 * wclrtobot --
60 *	Erase everything on the window.
61 */
62int
63wclrtobot(WINDOW *win)
64{
65	int	 minx, startx, starty, y;
66	__LDATA	*sp, *end, *maxx;
67	attr_t	attr;
68
69#ifdef __GNUC__
70	maxx = NULL;		/* XXX gcc -Wuninitialized */
71#endif
72	if (win->lines[win->cury]->flags & __ISPASTEOL) {
73		starty = win->cury + 1;
74		startx = 0;
75	} else {
76		starty = win->cury;
77		startx = win->curx;
78	}
79	if (__using_color && win != curscr)
80		attr = win->battr & __COLOR;
81	else
82		attr = 0;
83	for (y = starty; y < win->maxy; y++) {
84		minx = -1;
85		end = &win->lines[y]->line[win->maxx];
86		for (sp = &win->lines[y]->line[startx]; sp < end; sp++)
87			if (sp->ch != ' ' || sp->attr != attr) {
88				maxx = sp;
89				if (minx == -1)
90					minx = sp - win->lines[y]->line;
91				sp->ch = ' ';
92				sp->attr = attr;
93			}
94		if (minx != -1)
95			__touchline(win, y, minx, maxx - win->lines[y]->line);
96		startx = 0;
97	}
98	return (OK);
99}
100