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overwrite.c revision 1.10 
      1 /*	$NetBSD: overwrite.c,v 1.10 1999/04/13 14:08:18 mrg 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[] = "@(#)overwrite.c	8.2 (Berkeley) 5/4/94";
     40 #else
     41 __RCSID("$NetBSD: overwrite.c,v 1.10 1999/04/13 14:08:18 mrg Exp $");
     42 #endif
     43 #endif				/* not lint */
     44 
     45 #include <ctype.h>
     46 #include <string.h>
     47 
     48 #include "curses.h"
     49 
     50 /*
     51  * overwrite --
     52  *	Writes win1 on win2 destructively.
     53  */
     54 int
     55 overwrite(win1, win2)
     56 	WINDOW *win1, *win2;
     57 {
     58 	int     x, y, endy, endx, starty, startx;
     59 
     60 #ifdef DEBUG
     61 	__CTRACE("overwrite: (%0.2o, %0.2o);\n", win1, win2);
     62 #endif
     63 	starty = max(win1->begy, win2->begy);
     64 	startx = max(win1->begx, win2->begx);
     65 	endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx);
     66 	endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
     67 	if (starty >= endy || startx >= endx)
     68 		return (OK);
     69 #ifdef DEBUG
     70 	__CTRACE("overwrite: from (%d, %d) to (%d, %d)\n",
     71 	    starty, startx, endy, endx);
     72 #endif
     73 	x = endx - startx;
     74 	for (y = starty; y < endy; y++) {
     75 		(void) memcpy(
     76 		    &win2->lines[y - win2->begy]->line[startx - win2->begx],
     77 		    &win1->lines[y - win1->begy]->line[startx - win1->begx],
     78 		    x * __LDATASIZE);
     79 		__touchline(win2, y, (int) (startx - win2->begx), (int) (endx - win2->begx),
     80 		    0);
     81 	}
     82 	return (OK);
     83 }
     84