title: Can isspace() give false positives with UTF-8 text?
body: <p>I know <code>isspace()</code> is meant to work for ASCII, but I have UTF-8 text. If <code>isspace()</code> looks only at the lower 7 bits, where UTF-8 and ASCII overlaps, it should be safe to use.</p>
  
  <p>By safe to use I mean that it won't detect a Unicode character that is not a whitespace as whitespace. I know that there might be special Unicode whitespaces which it will not detect, but that is not a problem for me.</p>
  
  <p>I.e. I'm OK with false negatives, so long as there are no positives. Is it correct to assume that?</p>