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- /*
- * Copyright (c) 1981 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)overlay.c 5.7 (Berkeley) 8/23/92";
- #endif /* not lint */
-
- #include <ctype.h>
- #include <curses.h>
-
- /*
- * overlay --
- * Writes win1 on win2 non-destructively.
- */
- int
- overlay(win1, win2)
- register WINDOW *win1, *win2;
- {
-
- register int x, y, y1, y2, endy, endx, starty, startx;
- register char *sp, *end;
-
- #ifdef DEBUG
- __TRACE("overlay: (%0.2o, %0.2o);\n", win1, win2);
- #endif
- 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
- __TRACE("overlay: from (%d,%d) to (%d,%d)\n",
- starty, startx, endy, endx);
- #endif
- if (starty >= endy || startx >= endx)
- return (OK);
- 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, y2, x, *sp);
- x++;
- }
- }
- return (OK);
- }
-