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      1 /*	$NetBSD: clrtoeol.c,v 1.36 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[] = "@(#)clrtoeol.c	8.2 (Berkeley) 5/4/94";
     36 #else
     37 __RCSID("$NetBSD: clrtoeol.c,v 1.36 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  * clrtoeol --
     49  *	Clear up to the end of line.
     50  */
     51 int
     52 clrtoeol(void)
     53 {
     54 	return wclrtoeol(stdscr);
     55 }
     56 
     57 #endif
     58 
     59 /*
     60  * wclrtoeol --
     61  *	Clear up to the end of line.
     62  */
     63 int
     64 wclrtoeol(WINDOW *win)
     65 {
     66 	int     minx, x, y;
     67 	__LDATA *end, *maxx, *sp;
     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 	y = win->cury;
     81 	x = win->curx;
     82 	if (win->alines[y]->flags & __ISPASTEOL) {
     83 		if (y < win->maxy - 1) {
     84 			win->alines[y]->flags &= ~__ISPASTEOL;
     85 			y++;
     86 			x = 0;
     87 			win->cury = y;
     88 			win->curx = x;
     89 		} else
     90 			return OK;
     91 	}
     92 	end = &win->alines[y]->line[win->maxx];
     93 	minx = -1;
     94 	maxx = &win->alines[y]->line[x];
     95 
     96 	for (sp = maxx; sp < end; sp++) {
     97 		/*
     98 		 * It looks like ncurses makes the rest of line foreground
     99 		 * when it is cleared - this doesn't seem right but it
    100 		 * makes applicatins look right.
    101 		 */
    102 		sp->cflags &= ~CA_BACKGROUND;
    103 		if (!(__NEED_ERASE(sp, bch, battr)))
    104 			continue;
    105 
    106 		maxx = sp;
    107 		if (minx == -1)
    108 			minx = (int)(sp - win->alines[y]->line);
    109 
    110 		sp->ch = bch;
    111 		sp->attr = battr | (sp->attr & __ALTCHARSET);
    112 #ifdef HAVE_WCHAR
    113 		if (_cursesi_copy_nsp(win->bnsp, sp) == ERR)
    114 			return ERR;
    115 		sp->wcols = 1;
    116 #endif
    117 	}
    118 
    119 	__CTRACE(__CTRACE_ERASE, "CLRTOEOL: y = %d, minx = %d, maxx = %d, "
    120 	    "firstch = %d, lastch = %d\n",
    121 	    y, minx, (int)(maxx - win->alines[y]->line),
    122 	    *win->alines[y]->firstchp, *win->alines[y]->lastchp);
    123 	/* Update firstch and lastch for the line. */
    124 	__touchline(win, y, x, (int)win->maxx - 1);
    125 	__sync(win);
    126 	return OK;
    127 }
    128