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overlay.c revision 1.7 
      1 /*
      2  * Copyright (c) 1981, 1993, 1994
      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 static char sccsid[] = "@(#)overlay.c	8.2 (Berkeley) 5/4/94";
     36 #endif	/* not lint */
     37 
     38 #include <ctype.h>
     39 
     40 #include "curses.h"
     41 
     42 /*
     43  * overlay --
     44  *	Writes win1 on win2 non-destructively.
     45  */
     46 int
     47 overlay(win1, win2)
     48 	register WINDOW *win1, *win2;
     49 {
     50 
     51 	register int x, y, y1, y2, endy, endx, starty, startx;
     52 	register __LDATA *sp, *end;
     53 
     54 #ifdef DEBUG
     55 	__CTRACE("overlay: (%0.2o, %0.2o);\n", win1, win2);
     56 #endif
     57 	starty = max(win1->begy, win2->begy);
     58 	startx = max(win1->begx, win2->begx);
     59 	endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx);
     60 	endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
     61 #ifdef DEBUG
     62 	__CTRACE("overlay: from (%d,%d) to (%d,%d)\n",
     63 	    starty, startx, endy, endx);
     64 #endif
     65 	if (starty >= endy || startx >= endx)
     66 		return (OK);
     67 	y1 = starty - win1->begy;
     68 	y2 = starty - win2->begy;
     69 	for (y = starty; y < endy; y++, y1++, y2++) {
     70 		end = &win1->lines[y1]->line[endx - win1->begx];
     71 		x = startx - win2->begx;
     72 		for (sp = &win1->lines[y1]->line[startx - win1->begx];
     73 		     sp < end; sp++) {
     74 			if (!isspace(sp->ch)) {
     75 				wmove(win2, y2, x);
     76 				__waddch(win2, sp);
     77 			}
     78 			x++;
     79 		}
     80 	}
     81 	return (OK);
     82 }
     83