toucholap.c revision 1.5 
1/*
2 * Copyright (c) 1981, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35/* from: static char sccsid[] = "@(#)toucholap.c	8.1 (Berkeley) 6/4/93"; */
36static char *rcsid = "$Id: toucholap.c,v 1.5 1993/11/09 04:08:50 cgd Exp $";
37#endif /* not lint */
38
39#include <curses.h>
40
41/*
42 * touchoverlap --
43 *	Touch, on win2, the part that overlaps with win1.
44 */
45int
46touchoverlap(win1, win2)
47	register WINDOW *win1, *win2;
48{
49	register int y, endy, endx, starty, startx;
50
51#ifdef DEBUG
52	__CTRACE("touchoverlap: (%0.2o, %0.2o);\n", win1, win2);
53#endif
54	starty = max(win1->begy, win2->begy);
55	startx = max(win1->begx, win2->begx);
56	endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx);
57	endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
58#ifdef DEBUG
59	__CTRACE("touchoverlap: from (%d,%d) to (%d,%d)\n",
60	    starty, startx, endy, endx);
61	__CTRACE("touchoverlap: win1 (%d,%d) to (%d,%d)\n",
62	    win1->begy, win1->begx, win1->begy + win1->maxy,
63	    win1->begx + win1->maxx);
64	__CTRACE("touchoverlap: win2 (%d,%d) to (%d,%d)\n",
65	    win2->begy, win2->begx, win2->begy + win2->maxy,
66	    win2->begx + win2->maxx);
67#endif
68	if (starty >= endy || startx >= endx)
69		return (OK);
70	starty -= win2->begy;
71	startx -= win2->begx;
72	endy -= win2->begy;
73	endx -= win2->begx;
74	for (--endx, y = starty; y < endy; y++)
75		__touchline(win2, y, startx, endx, 0);
76	return (OK);
77}
78
79