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overlay.c revision 1.11 
      1 /*	$NetBSD: overlay.c,v 1.11 2000/04/11 13:57:10 blymn Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1981, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)overlay.c	8.2 (Berkeley) 5/4/94";
     40 #else
     41 __RCSID("$NetBSD: overlay.c,v 1.11 2000/04/11 13:57:10 blymn Exp $");
     42 #endif
     43 #endif				/* not lint */
     44 
     45 #include <ctype.h>
     46 
     47 #include "curses.h"
     48 #include "curses_private.h"
     49 
     50 /*
     51  * overlay --
     52  *	Writes win1 on win2 non-destructively.
     53  */
     54 int
     55 overlay(win1, win2)
     56 	const WINDOW *win1;
     57 	WINDOW *win2;
     58 {
     59 
     60 	int     x, y, y1, y2, endy, endx, starty, startx;
     61 	__LDATA *sp, *end;
     62 
     63 #ifdef DEBUG
     64 	__CTRACE("overlay: (%0.2o, %0.2o);\n", win1, win2);
     65 #endif
     66 	starty = max(win1->begy, win2->begy);
     67 	startx = max(win1->begx, win2->begx);
     68 	endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx);
     69 	endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
     70 #ifdef DEBUG
     71 	__CTRACE("overlay: from (%d,%d) to (%d,%d)\n",
     72 	    starty, startx, endy, endx);
     73 #endif
     74 	if (starty >= endy || startx >= endx)
     75 		return (OK);
     76 	y1 = starty - win1->begy;
     77 	y2 = starty - win2->begy;
     78 	for (y = starty; y < endy; y++, y1++, y2++) {
     79 		end = &win1->lines[y1]->line[endx - win1->begx];
     80 		x = startx - win2->begx;
     81 		for (sp = &win1->lines[y1]->line[startx - win1->begx];
     82 		    sp < end; sp++) {
     83 			if (!isspace(sp->ch)) {
     84 				wmove(win2, y2, x);
     85 				__waddch(win2, sp);
     86 			}
     87 			x++;
     88 		}
     89 	}
     90 	return (OK);
     91 }
     92