/*      $NetBSD: chgat.c,v 1.10 2024/12/23 02:58:03 blymn Exp $ */

/*
* Copyright (c) 2009 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Joerg Sonnenberger.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__RCSID("$NetBSD: chgat.c,v 1.10 2024/12/23 02:58:03 blymn Exp $");

#include "curses.h"
#include "curses_private.h"

int
chgat(int n, attr_t attr, short color, const void *opts)
{
       return wchgat(stdscr, n, attr, color, opts);
}

int
mvchgat(int y, int x, int n, attr_t attr, short color,
   const void *opts)
{
       return mvwchgat(stdscr, y, x, n, attr, color, opts);
}

int
wchgat(WINDOW *win, int n, attr_t attr, short color, const void *opts)
{
       return mvwchgat(win, win->cury, win->curx, n, attr, color, opts);
}

int
mvwchgat(WINDOW *win , int y, int x, int count, attr_t attr, short color,
   const void *opts)
{
       __LINE *lp;
       __LDATA *lc;

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

       if (x < 0 || y < 0)
               return (ERR);
       if (x >= win->maxx || y >= win->maxy)
               return (ERR);

       attr = (attr & ~__COLOR) | COLOR_PAIR(color);

       if (count < 0 || count > win->maxx - x)
               count = win->maxx - x;

       __CTRACE(__CTRACE_ATTR, "mvwchgat: x: %d y: %d count: %d attr: 0x%x "
           "color pair %d\n", x, y, count, (attr & ~__COLOR),
           PAIR_NUMBER(color));
       lp = win->alines[y];
       lc = &lp->line[x];

       if (x + win->ch_off < *lp->firstchp)
               *lp->firstchp = x + win->ch_off;

       if (x + win->ch_off + count > *lp->lastchp)
               *lp->lastchp = x + win->ch_off + count;

       lp->flags |= __ISDIRTY;

       while (count-- > 0) {
#ifdef HAVE_WCHAR
               lc->attr = (lc->attr & ~WA_ATTRIBUTES) | attr;
#else
               lc->attr = attr;
#endif
               ++lc;
       }

       return OK;
}