xref: /illumos-gate/usr/src/ucblib/libcurses/toucholap.c (revision 8c0b080c8ed055a259d8cd26b9f005211c6a9753)
1 /*
2  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  */
5 
6 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
7 /*	  All Rights Reserved  	*/
8 
9 /*
10  * Copyright (c) 1980 Regents of the University of California.
11  * All rights reserved.  The Berkeley software License Agreement
12  * specifies the terms and conditions for redistribution.
13  */
14 
15 /*LINTLIBRARY*/
16 
17 #ifndef lint
18 static char
19 sccsid[] = "@(#)toucholap.c 1.4 89/08/03 SMI"; /* from UCB 5.1 85/06/07 */
20 #endif	/* not lint */
21 
22 #include	"curses.ext"
23 
24 #define	min(a, b)	((a) < (b) ? (a) : (b))
25 #define	max(a, b)	((a) > (b) ? (a) : (b))
26 
27 /*
28  *	Touch, on win2, the part that overlaps with win1.
29  */
30 
31 int
touchoverlap(WINDOW * win1,WINDOW * win2)32 touchoverlap(WINDOW *win1, WINDOW *win2)
33 {
34 	int	y, endy, endx, starty, startx;
35 
36 #ifdef DEBUG
37 	fprintf(outf, "TOUCHOVERLAP(%0.2o, %0.2o);\n", win1, win2);
38 #endif
39 	starty = max(win1->_begy, win2->_begy);
40 	startx = max(win1->_begx, win2->_begx);
41 	endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begy);
42 	endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
43 #ifdef DEBUG
44 	fprintf(outf, "TOUCHOVERLAP:from (%d,%d) to (%d,%d)\n",
45 	    starty, startx, endy, endx);
46 	fprintf(outf, "TOUCHOVERLAP:win1 (%d,%d) to (%d,%d)\n",
47 	    win1->_begy, win1->_begx, win1->_begy + win1->_maxy,
48 	    win1->_begx + win1->_maxx);
49 	fprintf(outf, "TOUCHOVERLAP:win2 (%d,%d) to (%d,%d)\n",
50 	    win2->_begy, win2->_begx, win2->_begy + win2->_maxy,
51 	    win2->_begx + win2->_maxx);
52 #endif
53 	if (starty >= endy || startx >= endx)
54 		return (OK);
55 	starty -= win2->_begy;
56 	startx -= win2->_begx;
57 	endy -= win2->_begy;
58 	endx -= win2->_begx;
59 	endx--;
60 	for (y = starty; y < endy; y++)
61 		(void) touchline(win2, y, startx, endx);
62 	return (OK);
63 }
64