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      1 /*
      2  * Copyright 2001 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[] = "@(#)overlay.c 1.9 89/07/13 SMI"; /* from UCB 5.2 86/02/12 */
     22 #endif /* not lint */
     23 
     24 #include	"curses.ext"
     25 #include	<ctype.h>
     26 
     27 #define	min(a, b)	((a) < (b) ? (a) : (b))
     28 #define	max(a, b)	((a) > (b) ? (a) : (b))
     29 
     30 /*
     31  *	This routine writes win1 on win2 non-destructively.
     32  */
     33 
     34 int
     35 overlay(WINDOW *win1, WINDOW *win2)
     36 {
     37 	char	*sp, *end;
     38 	int	x, y, endy, endx, starty, startx;
     39 	int 	y1, y2;
     40 
     41 #ifdef DEBUG
     42 	fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2);
     43 #endif
     44 	starty = max(win1->_begy, win2->_begy);
     45 	startx = max(win1->_begx, win2->_begx);
     46 	endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begy);
     47 	endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
     48 #ifdef DEBUG
     49 	fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n",
     50 	    starty, startx, endy, endx);
     51 #endif
     52 	if (starty >= endy || startx >= endx)
     53 		return (OK);
     54 	y1 = starty - win1->_begy;
     55 	y2 = starty - win2->_begy;
     56 	for (y = starty; y < endy; y++, y1++, y2++) {
     57 		end = &win1->_y[y1][endx - win1->_begx];
     58 		x = startx - win2->_begx;
     59 		for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
     60 			if (!isspace(*sp))
     61 				(void) mvwaddch(win2, y2, x, *sp);
     62 			x++;
     63 		}
     64 	}
     65 	return (OK);
     66 }
     67