void
warptoclient(Client *c)
{
  int x, y;
    
  if (!c) {
    XWarpPointer(dpy, None, root, 0, 0, 0, 0, selmon->wx + selmon->ww/2, selmon->wy + selmon->wh/2);
    return;
  }
    
  x = c->x + WIDTH(c) / 2;
  y = c->y + HEIGHT(c) / 2;
    
  XWarpPointer(dpy, None, root, 0, 0, 0, 0, x, y);
}