-# include "curses.h"
+/*
+ * Copyright (c) 1981 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley. The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)overlay.c 5.5 (Berkeley) %G%";
+#endif /* not lint */
+
+# include "curses.ext"
# include <ctype.h>
# define min(a,b) (a < b ? a : b)
-# define max(a,b) (a < b ? a : b)
+# define max(a,b) (a > b ? a : b)
/*
* This routine writes win1 on win2 non-destructively.
*
- * %G% (Berkeley) @(#)overlay.c 1.1
*/
overlay(win1, win2)
reg WINDOW *win1, *win2; {
reg char *sp, *end;
- reg int x, y, endy, endx, starty, startx, y_top,
- y_bot, x_left, x_right;
+ reg int x, y, endy, endx, starty, startx;
+ reg int y1,y2;
# ifdef DEBUG
fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2);
# endif
- y_top = max(win1->_begy, win2->_begy);
- y_bot = min(win1->_maxy, win2->_maxy);
- x_left = max(win1->_begx, win2->_begx);
- x_right = min(win1->_maxx, win2->_maxx);
- starty = y_top - win1->_begy;
- startx = x_left - win1->_begx;
- endy = y_bot - win1->_begy;
- endx = x_right - win1->_begx;
- for (y = starty; y < endy; y++) {
- end = &win1->_y[y][endx];
- x = startx + win1->_begx;
- for (sp = &win1->_y[y][startx]; sp <= end; sp++) {
+ starty = max(win1->_begy, win2->_begy);
+ startx = max(win1->_begx, win2->_begx);
+ endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begx);
+ endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
+# ifdef DEBUG
+ fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx);
+# endif
+ if (starty >= endy || startx >= endx)
+ return;
+ y1 = starty - win1->_begy;
+ y2 = starty - win2->_begy;
+ for (y = starty; y < endy; y++, y1++, y2++) {
+ end = &win1->_y[y1][endx - win1->_begx];
+ x = startx - win2->_begx;
+ for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
if (!isspace(*sp))
- mvwaddch(win2, y + win1->_begy, x, *sp);
+ mvwaddch(win2, y2, x, *sp);
x++;
}
}