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      1 /*	$NetBSD: chgat.c,v 1.10 2024/12/23 02:58:03 blymn Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2009 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Joerg Sonnenberger.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: chgat.c,v 1.10 2024/12/23 02:58:03 blymn Exp $");
     34 
     35 #include "curses.h"
     36 #include "curses_private.h"
     37 
     38 int
     39 chgat(int n, attr_t attr, short color, const void *opts)
     40 {
     41 	return wchgat(stdscr, n, attr, color, opts);
     42 }
     43 
     44 int
     45 mvchgat(int y, int x, int n, attr_t attr, short color,
     46     const void *opts)
     47 {
     48 	return mvwchgat(stdscr, y, x, n, attr, color, opts);
     49 }
     50 
     51 int
     52 wchgat(WINDOW *win, int n, attr_t attr, short color, const void *opts)
     53 {
     54 	return mvwchgat(win, win->cury, win->curx, n, attr, color, opts);
     55 }
     56 
     57 int
     58 mvwchgat(WINDOW *win , int y, int x, int count, attr_t attr, short color,
     59     const void *opts)
     60 {
     61 	__LINE *lp;
     62 	__LDATA *lc;
     63 
     64 	if (__predict_false(win == NULL))
     65 		return ERR;
     66 
     67 	if (x < 0 || y < 0)
     68 		return (ERR);
     69 	if (x >= win->maxx || y >= win->maxy)
     70 		return (ERR);
     71 
     72 	attr = (attr & ~__COLOR) | COLOR_PAIR(color);
     73 
     74 	if (count < 0 || count > win->maxx - x)
     75 		count = win->maxx - x;
     76 
     77 	__CTRACE(__CTRACE_ATTR, "mvwchgat: x: %d y: %d count: %d attr: 0x%x "
     78 	    "color pair %d\n", x, y, count, (attr & ~__COLOR),
     79 	    PAIR_NUMBER(color));
     80 	lp = win->alines[y];
     81 	lc = &lp->line[x];
     82 
     83 	if (x + win->ch_off < *lp->firstchp)
     84 		*lp->firstchp = x + win->ch_off;
     85 
     86 	if (x + win->ch_off + count > *lp->lastchp)
     87 		*lp->lastchp = x + win->ch_off + count;
     88 
     89 	lp->flags |= __ISDIRTY;
     90 
     91 	while (count-- > 0) {
     92 #ifdef HAVE_WCHAR
     93 		lc->attr = (lc->attr & ~WA_ATTRIBUTES) | attr;
     94 #else
     95 		lc->attr = attr;
     96 #endif
     97 		++lc;
     98 	}
     99 
    100 	return OK;
    101 }
    102