1/*	$NetBSD: clrtoeol.c,v 1.35 2022/05/12 22:25:38 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
35static char sccsid[] = "@(#)clrtoeol.c	8.2 (Berkeley) 5/4/94";
36#else
37__RCSID("$NetBSD: clrtoeol.c,v 1.35 2022/05/12 22:25:38 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 * clrtoeol --
49 *	Clear up to the end of line.
50 */
51int
52clrtoeol(void)
53{
54	return wclrtoeol(stdscr);
55}
56
57#endif
58
59/*
60 * wclrtoeol --
61 *	Clear up to the end of line.
62 */
63int
64wclrtoeol(WINDOW *win)
65{
66	int     minx, x, y;
67	__LDATA *end, *maxx, *sp;
68	wchar_t bch;
69	attr_t	battr;
70
71	bch = win->bch;
72	if (win != curscr)
73		battr = win->battr & __ATTRIBUTES;
74	else
75		battr = 0;
76
77	y = win->cury;
78	x = win->curx;
79	if (win->alines[y]->flags & __ISPASTEOL) {
80		if (y < win->maxy - 1) {
81			win->alines[y]->flags &= ~__ISPASTEOL;
82			y++;
83			x = 0;
84			win->cury = y;
85			win->curx = x;
86		} else
87			return OK;
88	}
89	end = &win->alines[y]->line[win->maxx];
90	minx = -1;
91	maxx = &win->alines[y]->line[x];
92
93	for (sp = maxx; sp < end; sp++) {
94		/*
95		 * It looks like ncurses makes the rest of line foreground
96		 * when it is cleared - this doesn't seem right but it
97		 * makes applicatins look right.
98		 */
99		sp->cflags &= ~CA_BACKGROUND;
100		if (!(__NEED_ERASE(sp, bch, battr)))
101			continue;
102
103		maxx = sp;
104		if (minx == -1)
105			minx = (int)(sp - win->alines[y]->line);
106
107		sp->ch = bch;
108		sp->attr = battr | (sp->attr & __ALTCHARSET);
109#ifdef HAVE_WCHAR
110		if (_cursesi_copy_nsp(win->bnsp, sp) == ERR)
111			return ERR;
112		sp->wcols = 1;
113#endif
114	}
115
116	__CTRACE(__CTRACE_ERASE, "CLRTOEOL: y = %d, minx = %d, maxx = %d, "
117	    "firstch = %d, lastch = %d\n",
118	    y, minx, (int)(maxx - win->alines[y]->line),
119	    *win->alines[y]->firstchp, *win->alines[y]->lastchp);
120	/* Update firstch and lastch for the line. */
121	__touchline(win, y, x, (int)win->maxx - 1);
122	__sync(win);
123	return OK;
124}
125