toucholap.c revision 1.3 1 /*
2 * Copyright (c) 1981 Regents of the University of California.
3 * 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 /*static char sccsid[] = "from: @(#)toucholap.c 5.6 (Berkeley) 8/23/92";*/
36 static char rcsid[] = "$Id: toucholap.c,v 1.3 1993/08/07 05:49:08 mycroft 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 */
45 int
46 touchoverlap(win1, win2)
47 register WINDOW *win1, *win2;
48 {
49 register int y, endy, endx, starty, startx;
50
51 #ifdef DEBUG
52 __TRACE("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 __TRACE("touchoverlap: from (%d,%d) to (%d,%d)\n",
60 starty, startx, endy, endx);
61 __TRACE("touchoverlap: win1 (%d,%d) to (%d,%d)\n",
62 win1->_begy, win1->_begx, win1->_begy + win1->_maxy,
63 win1->_begx + win1->_maxx);
64 __TRACE("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);
76 return (OK);
77 }
78