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      1 /*
      2  * Copyright 2004 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[] = "@(#)overwrite.c 1.7 88/02/08 SMI"; /* from UCB 5.1 85/06/07 */
     22 #endif	/* not lint */
     23 
     24 #include	"curses.ext"
     25 #include	<ctype.h>
     26 #include	<string.h>
     27 
     28 #define	min(a, b)	((a) < (b) ? (a) : (b))
     29 #define	max(a, b)	((a) > (b) ? (a) : (b))
     30 
     31 /*
     32  *	This routine writes win1 on win2 destructively.
     33  */
     34 
     35 int
     36 overwrite(WINDOW *win1, WINDOW *win2)
     37 {
     38 	int	x, y, endy, endx, starty, startx;
     39 
     40 #ifdef DEBUG
     41 	fprintf(outf, "OVERWRITE(%0.2o, %0.2o);\n", win1, win2);
     42 #endif
     43 	starty = max(win1->_begy, win2->_begy);
     44 	startx = max(win1->_begx, win2->_begx);
     45 	endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begy);
     46 	endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
     47 	if (starty >= endy || startx >= endx)
     48 		return (OK);
     49 #ifdef DEBUG
     50 	fprintf(outf, "OVERWRITE:from (%d,%d) to (%d,%d)\n",
     51 	    starty, startx, endy, endx);
     52 #endif
     53 	x = endx - startx;
     54 	for (y = starty; y < endy; y++) {
     55 		(void) memmove(&win2->_y[y - win2->_begy][startx - win2->_begx],
     56 		    &win1->_y[y - win1->_begy][startx - win1->_begx], x);
     57 		(void) touchline(win2, y, startx - win2->_begx,
     58 		    endx - win2->_begx);
     59 	}
     60 	return (OK);
     61 }
     62