usr/src/lib/libcurses/toucholap.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)toucholap.c 5.1 (Berkeley) %G%";
#endif not lint

# include       "curses.ext"

# define        min(a,b)        (a < b ? a : b)
# define        max(a,b)        (a > b ? a : b)

/*
 *      Touch, on win2, the part that overlaps with win1.
 *
 */
touchoverlap(win1, win2)
reg WINDOW      *win1, *win2; {

        reg int         x, y, endy, endx, starty, startx;

# ifdef DEBUG
        fprintf(outf, "TOUCHOVERLAP(%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
        fprintf(outf, "TOUCHOVERLAP:from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx);
        fprintf(outf, "TOUCHOVERLAP:win1 (%d,%d) to (%d,%d)\n", win1->_begy, win1->_begx, win1->_begy + win1->_maxy, win1->_begx + win1->_maxx);
        fprintf(outf, "TOUCHOVERLAP:win2 (%d,%d) to (%d,%d)\n", win2->_begy, win2->_begx, win2->_begy + win2->_maxy, win2->_begx + win2->_maxx);
# endif
        if (starty >= endy || startx >= endx)
                return;
        starty -= win2->_begy;
        startx -= win2->_begx;
        endy -= win2->_begy;
        endx -= win2->_begx;
        endx--;
        for (y = starty; y < endy; y++)
                touchline(win2, y, startx, endx);
}