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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"; */
     36 static 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  */
     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 	__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