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static int
compare (const struct line *a, const struct line *b)
{
  int diff;
  size_t alen, blen;

  /* First try to compare on the specified keys (if any).
     The only two cases with no key at all are unadorned sort,
     and unadorned sort -r. */
  if (keylist)
    {    
      diff = keycompare (a, b);
      if (diff || unique || stable)
        return diff;
    }    

  /* If the keys all compare equal (or no keys were specified)
     fall through to the default comparison.  */
  alen = a->length - 1, blen = b->length - 1; 

  if (alen == 0)
    diff = - NONZERO (blen);
  else if (blen == 0)
    diff = 1; 
  else if (hard_LC_COLLATE)
    diff = xmemcoll (a->text, alen, b->text, blen);
  else if (! (diff = memcmp (a->text, b->text, MIN (alen, blen))))
    diff = alen < blen ? -1 : alen != blen;

  return reverse ? -diff : diff;
}