/*      $NetBSD: clrtobot.c,v 1.32 2024/12/23 02:58:03 blymn Exp $      */

/*
* Copyright (c) 1981, 1993, 1994
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)clrtobot.c  8.2 (Berkeley) 5/4/94";
#else
__RCSID("$NetBSD: clrtobot.c,v 1.32 2024/12/23 02:58:03 blymn Exp $");
#endif
#endif                          /* not lint */

#include <stdlib.h>
#include "curses.h"
#include "curses_private.h"

#ifndef _CURSES_USE_MACROS

/*
* clrtobot --
*      Erase everything on stdscr.
*/
int
clrtobot(void)
{
       return wclrtobot(stdscr);
}

#endif

/*
* wclrtobot --
*      Erase everything on the window.
*/
int
wclrtobot(WINDOW *win)
{
       int      minx, startx, starty, y;
       __LDATA *sp, *end, *maxx;
       wchar_t bch;
       attr_t  battr;

       if (__predict_false(win == NULL))
               return ERR;

       bch = win->bch;
       if (win != curscr)
               battr = win->battr & __ATTRIBUTES;
       else
               battr = 0;

#ifdef __GNUC__
       maxx = NULL;            /* XXX gcc -Wuninitialized */
#endif
       if (win->alines[win->cury]->flags & __ISPASTEOL) {
               starty = win->cury + 1;
               startx = 0;
       } else {
               starty = win->cury;
               startx = win->curx;
       }

       for (y = starty; y < win->maxy; y++) {
               minx = -1;
               end = &win->alines[y]->line[win->maxx];
               for (sp = &win->alines[y]->line[startx]; sp < end; sp++) {
                       if (!(__NEED_ERASE(sp, bch, battr)))
                               continue;

                       maxx = sp;
                       if (minx == -1)
                               minx = (int)(sp - win->alines[y]->line);

                       sp->ch = bch;
                       sp->cflags |= CA_BACKGROUND;
                       sp->cflags &= CA_CONTINUATION;
                       sp->attr = battr | (sp->attr & __ALTCHARSET);
#ifdef HAVE_WCHAR
                       if (_cursesi_copy_nsp(win->bnsp, sp) == ERR)
                               return ERR;
                       sp->wcols = 1;
#endif
               }

               if (minx != -1)
                       __touchline(win, y, minx,
                                   (int)(maxx - win->alines[y]->line));
               startx = 0;
       }

       __sync(win);
       return OK;
}