Do a Google search for "mac svn client".  The Wikipedia page that
compares svn clients includes KDEsvn, Qsvn, Subcommander svnX, WebSVN,
and xcode (included with OS X 10.5).

That's all the right code.  How are you determining the bailout?  We use
the following, or something similar (from fractals.c):

int near fpMODbailout(void)
{
  tempsqrx=sqr(new.x);
  tempsqry=sqr(new.y);
  magnitude = tempsqrx + tempsqry;
  if(magnitude >= rqlim) return(1);
  old = new;
  return(0);
}

Where rqlim normally defaults to 4.