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      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 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     16 
     17 /*LINTLIBRARY*/
     18 
     19 #ifndef lint
     20 static char
     21 sccsid[] = "@(#)toucholap.c 1.4 89/08/03 SMI"; /* from UCB 5.1 85/06/07 */
     22 #endif	/* not lint */
     23 
     24 #include	"curses.ext"
     25 
     26 #define	min(a, b)	((a) < (b) ? (a) : (b))
     27 #define	max(a, b)	((a) > (b) ? (a) : (b))
     28 
     29 /*
     30  *	Touch, on win2, the part that overlaps with win1.
     31  */
     32 
     33 int
     34 touchoverlap(WINDOW *win1, WINDOW *win2)
     35 {
     36 	int	y, endy, endx, starty, startx;
     37 
     38 #ifdef DEBUG
     39 	fprintf(outf, "TOUCHOVERLAP(%0.2o, %0.2o);\n", win1, win2);
     40 #endif
     41 	starty = max(win1->_begy, win2->_begy);
     42 	startx = max(win1->_begx, win2->_begx);
     43 	endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begy);
     44 	endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
     45 #ifdef DEBUG
     46 	fprintf(outf, "TOUCHOVERLAP:from (%d,%d) to (%d,%d)\n",
     47 	    starty, startx, endy, endx);
     48 	fprintf(outf, "TOUCHOVERLAP:win1 (%d,%d) to (%d,%d)\n",
     49 	    win1->_begy, win1->_begx, win1->_begy + win1->_maxy,
     50 	    win1->_begx + win1->_maxx);
     51 	fprintf(outf, "TOUCHOVERLAP:win2 (%d,%d) to (%d,%d)\n",
     52 	    win2->_begy, win2->_begx, win2->_begy + win2->_maxy,
     53 	    win2->_begx + win2->_maxx);
     54 #endif
     55 	if (starty >= endy || startx >= endx)
     56 		return (OK);
     57 	starty -= win2->_begy;
     58 	startx -= win2->_begx;
     59 	endy -= win2->_begy;
     60 	endx -= win2->_begx;
     61 	endx--;
     62 	for (y = starty; y < endy; y++)
     63 		(void) touchline(win2, y, startx, endx);
     64 	return (OK);
     65 }
     66