52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/*
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* Copyright (c) 1980 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)overlay.c 1.1 92/07/30 SMI"; /* from UCB 5.2 86/02/12 */
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#endif not lint
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# include "curses.ext"
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# include <ctype.h>
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# define min(a,b) (a < b ? a : b)
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# define max(a,b) (a > b ? a : b)
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/*
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* This routine writes win1 on win2 non-destructively.
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*
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*/
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overlay(win1, win2)
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reg WINDOW *win1, *win2; {
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reg char *sp, *end;
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reg int x, y, endy, endx, starty, startx;
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reg int y1,y2;
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# ifdef DEBUG
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fprintf(outf, "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->_begy);
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endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
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# ifdef DEBUG
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fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx);
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# endif
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if (starty >= endy || startx >= endx)
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return;
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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->_y[y1][endx - win1->_begx];
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x = startx - win2->_begx;
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for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
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if (!isspace(*sp))
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mvwaddch(win2, y2, x, *sp);
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x++;
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}
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}
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}
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