toucholap.c revision 1.13 
1/*	$NetBSD: toucholap.c,v 1.13 2003/02/17 11:07:21 dsl 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38#if 0
39static char sccsid[] = "@(#)toucholap.c	8.2 (Berkeley) 5/4/94";
40#else
41__RCSID("$NetBSD: toucholap.c,v 1.13 2003/02/17 11:07:21 dsl Exp $");
42#endif
43#endif				/* not lint */
44
45#include "curses.h"
46#include "curses_private.h"
47
48/*
49 * touchoverlap --
50 *	Touch, on win2, the part that overlaps with win1.
51 */
52int
53touchoverlap(WINDOW *win1, WINDOW *win2)
54{
55	int     y, endy, endx, starty, startx;
56
57#ifdef DEBUG
58	__CTRACE("touchoverlap: (%p, %p);\n", win1, win2);
59#endif
60	starty = max(win1->begy, win2->begy);
61	startx = max(win1->begx, win2->begx);
62	endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx);
63	endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
64#ifdef DEBUG
65	__CTRACE("touchoverlap: from (%d,%d) to (%d,%d)\n",
66	    starty, startx, endy, endx);
67	__CTRACE("touchoverlap: win1 (%d,%d) to (%d,%d)\n",
68	    win1->begy, win1->begx, win1->begy + win1->maxy,
69	    win1->begx + win1->maxx);
70	__CTRACE("touchoverlap: win2 (%d,%d) to (%d,%d)\n",
71	    win2->begy, win2->begx, win2->begy + win2->maxy,
72	    win2->begx + win2->maxx);
73#endif
74	if (starty >= endy || startx >= endx)
75		return (OK);
76	starty -= win2->begy;
77	startx -= win2->begx;
78	endy -= win2->begy;
79	endx -= win2->begx;
80	for (--endx, y = starty; y < endy; y++)
81		__touchline(win2, y, startx, endx);
82	return (OK);
83}
84