lint

[unix-history] / usr / src / lib / libcurses / toucholap.c

/*
* Copyright (c) 1981 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)toucholap.c 5.6 (Berkeley) %G%";
#endif /* not lint */

#include <curses.h>

/*
* touchoverlap --
*      Touch, on win2, the part that overlaps with win1.
*/
int
touchoverlap(win1, win2)
       register WINDOW *win1, *win2;
{
       register int y, endy, endx, starty, startx;

#ifdef DEBUG
       __TRACE("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
       __TRACE("touchoverlap: from (%d,%d) to (%d,%d)\n",
           starty, startx, endy, endx);
       __TRACE("touchoverlap: win1 (%d,%d) to (%d,%d)\n",
           win1->_begy, win1->_begx, win1->_begy + win1->_maxy,
           win1->_begx + win1->_maxx);
       __TRACE("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 (OK);
       starty -= win2->_begy;
       startx -= win2->_begx;
       endy -= win2->_begy;
       endx -= win2->_begx;
       for (--endx, y = starty; y < endy; y++)
               touchline(win2, y, startx, endx);
       return (OK);
}