82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
/*
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* Copyright (c) 1981, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)overlay.c 8.1 (Berkeley) 6/4/93";
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#endif /* not lint */
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#include <ctype.h>
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#include <curses.h>
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/*
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* overlay --
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* Writes win1 on win2 non-destructively.
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*/
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int
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overlay(win1, win2)
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register WINDOW *win1, *win2;
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{
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register int x, y, y1, y2, endy, endx, starty, startx;
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register __LDATA *sp, *end;
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#ifdef DEBUG
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__CTRACE("overlay: (%0.2o, %0.2o);\n", win1, win2);
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#endif
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starty = max(win1->begy, win2->begy);
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startx = max(win1->begx, win2->begx);
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endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx);
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endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
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#ifdef DEBUG
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__CTRACE("overlay: from (%d,%d) to (%d,%d)\n",
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starty, startx, endy, endx);
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#endif
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if (starty >= endy || startx >= endx)
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return (OK);
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y1 = starty - win1->begy;
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y2 = starty - win2->begy;
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for (y = starty; y < endy; y++, y1++, y2++) {
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end = &win1->lines[y1]->line[endx - win1->begx];
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x = startx - win2->begx;
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for (sp = &win1->lines[y1]->line[startx - win1->begx];
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sp < end; sp++) {
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if (!isspace(sp->ch)) {
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wmove(win2, y2, x);
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__waddch(win2, sp);
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}
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x++;
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}
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}
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return (OK);
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}
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