| 1 | /*
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| 2 | * Copyright (c) 1981 Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. All advertising materials mentioning features or use of this software
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| 14 | * must display the following acknowledgement:
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| 15 | * This product includes software developed by the University of
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| 16 | * California, Berkeley and its contributors.
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| 17 | * 4. Neither the name of the University nor the names of its contributors
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| 18 | * may be used to endorse or promote products derived from this software
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| 19 | * without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 31 | * SUCH DAMAGE.
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| 32 | */
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| 33 |
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| 34 | #ifndef lint
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| 35 | static char sccsid[] = "@(#)overlay.c 5.6 (Berkeley) 6/1/90";
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| 36 | #endif /* not lint */
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| 37 |
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| 38 | # include "curses.ext"
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| 39 | # include <ctype.h>
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| 40 |
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| 41 | # define min(a,b) (a < b ? a : b)
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| 42 | # define max(a,b) (a > b ? a : b)
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| 43 |
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| 44 | /*
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| 45 | * This routine writes win1 on win2 non-destructively.
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| 46 | *
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| 47 | */
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| 48 | overlay(win1, win2)
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| 49 | reg WINDOW *win1, *win2; {
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| 50 |
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| 51 | reg char *sp, *end;
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| 52 | reg int x, y, endy, endx, starty, startx;
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| 53 | reg int y1,y2;
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| 54 |
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| 55 | # ifdef DEBUG
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| 56 | fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2);
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| 57 | # endif
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| 58 | starty = max(win1->_begy, win2->_begy);
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| 59 | startx = max(win1->_begx, win2->_begx);
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| 60 | endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begx);
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| 61 | endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
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| 62 | # ifdef DEBUG
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| 63 | fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx);
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| 64 | # endif
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| 65 | if (starty >= endy || startx >= endx)
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| 66 | return;
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| 67 | y1 = starty - win1->_begy;
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| 68 | y2 = starty - win2->_begy;
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| 69 | for (y = starty; y < endy; y++, y1++, y2++) {
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| 70 | end = &win1->_y[y1][endx - win1->_begx];
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| 71 | x = startx - win2->_begx;
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| 72 | for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
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| 73 | if (!isspace(*sp))
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| 74 | mvwaddch(win2, y2, x, *sp);
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| 75 | x++;
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| 76 | }
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| 77 | }
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| 78 | }
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