clrtobot.c revision 1.23 
1/*	$NetBSD: clrtobot.c,v 1.23 2017/01/02 10:28:34 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
35static char sccsid[] = "@(#)clrtobot.c	8.2 (Berkeley) 5/4/94";
36#else
37__RCSID("$NetBSD: clrtobot.c,v 1.23 2017/01/02 10:28:34 roy 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 */
51int
52clrtobot(void)
53{
54	return wclrtobot(stdscr);
55}
56
57#endif
58
59/*
60 * wclrtobot --
61 *	Erase everything on the window.
62 */
63int
64wclrtobot(WINDOW *win)
65{
66	int	 minx, startx, starty, y;
67	__LDATA	*sp, *end, *maxx;
68	attr_t	attr;
69
70#ifdef __GNUC__
71	maxx = NULL;		/* XXX gcc -Wuninitialized */
72#endif
73	if (win->alines[win->cury]->flags & __ISPASTEOL) {
74		starty = win->cury + 1;
75		startx = 0;
76	} else {
77		starty = win->cury;
78		startx = win->curx;
79	}
80	if (win != curscr)
81		attr = win->battr & __ATTRIBUTES;
82	else
83		attr = 0;
84	for (y = starty; y < win->maxy; y++) {
85		minx = -1;
86		end = &win->alines[y]->line[win->maxx];
87		for (sp = &win->alines[y]->line[startx]; sp < end; sp++) {
88#ifndef HAVE_WCHAR
89			if (sp->ch != win->bch || sp->attr != attr) {
90#else
91			if (sp->ch != (wchar_t)btowc((int) win->bch) ||
92			    (sp->attr & WA_ATTRIBUTES) != attr || sp->nsp) {
93#endif /* HAVE_WCHAR */
94				maxx = sp;
95				if (minx == -1)
96					minx = (int)(sp - win->alines[y]->line);
97				if (sp->attr & __ALTCHARSET)
98					sp->attr = attr | __ALTCHARSET;
99				else
100					sp->attr = attr;
101#ifdef HAVE_WCHAR
102				sp->ch = ( wchar_t )btowc(( int ) win->bch);
103				if (_cursesi_copy_nsp(win->bnsp, sp) == ERR)
104					return ERR;
105				SET_WCOL( *sp, 1 );
106#else
107				sp->ch = win->bch;
108#endif /* HAVE_WCHAR */
109			}
110		}
111
112		if (minx != -1)
113			__touchline(win, y, minx,
114				    (int) (maxx - win->alines[y]->line));
115		startx = 0;
116	}
117	__sync(win);
118	return (OK);
119}
120