toucholap.c revision 1.4 
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
35static char sccsid[] = "@(#)toucholap.c	8.1 (Berkeley) 6/4/93";
36#endif /* not lint */
37
38#include <curses.h>
39
40/*
41 * touchoverlap --
42 *	Touch, on win2, the part that overlaps with win1.
43 */
44int
45touchoverlap(win1, win2)
46	register WINDOW *win1, *win2;
47{
48	register int y, endy, endx, starty, startx;
49
50#ifdef DEBUG
51	__CTRACE("touchoverlap: (%0.2o, %0.2o);\n", win1, win2);
52#endif
53	starty = max(win1->begy, win2->begy);
54	startx = max(win1->begx, win2->begx);
55	endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx);
56	endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
57#ifdef DEBUG
58	__CTRACE("touchoverlap: from (%d,%d) to (%d,%d)\n",
59	    starty, startx, endy, endx);
60	__CTRACE("touchoverlap: win1 (%d,%d) to (%d,%d)\n",
61	    win1->begy, win1->begx, win1->begy + win1->maxy,
62	    win1->begx + win1->maxx);
63	__CTRACE("touchoverlap: win2 (%d,%d) to (%d,%d)\n",
64	    win2->begy, win2->begx, win2->begy + win2->maxy,
65	    win2->begx + win2->maxx);
66#endif
67	if (starty >= endy || startx >= endx)
68		return (OK);
69	starty -= win2->begy;
70	startx -= win2->begx;
71	endy -= win2->begy;
72	endx -= win2->begx;
73	for (--endx, y = starty; y < endy; y++)
74		__touchline(win2, y, startx, endx, 0);
75	return (OK);
76}
77
78