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overlay.c revision 1.4 
      1 /*
      2  * Copyright (c) 1981 Regents of the University of California.
      3  * 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[] = "from: @(#)overlay.c	5.7 (Berkeley) 8/23/92";*/
     36 static char rcsid[] = "$Id: overlay.c,v 1.4 1993/08/07 05:49:01 mycroft Exp $";
     37 #endif	/* not lint */
     38 
     39 #include <ctype.h>
     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 char *sp, *end;
     53 
     54 #ifdef DEBUG
     55 	__TRACE("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 	__TRACE("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->_y[y1][endx - win1->_begx];
     71 		x = startx - win2->_begx;
     72 		for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
     73 			if (!isspace(*sp))
     74 				mvwaddch(win2, y2, x, *sp);
     75 			x++;
     76 		}
     77 	}
     78 	return (OK);
     79 }
     80