/* Case and normalization insensitive comparison of Unicode strings.
   Copyright (C) 2009-2018 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2009.

   This program is free software: you can redistribute it and/or
   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

int
FUNC (const SRC_UNIT *s1, size_t n1, const SRC_UNIT *s2, size_t n2,
      const char *iso639_language, uninorm_t nf, int *resultp)
{
  UNIT buf1[2048 / sizeof (UNIT)];
  UNIT buf2[2048 / sizeof (UNIT)];
  UNIT *norms1;
  size_t norms1_length;
  UNIT *norms2;
  size_t norms2_length;
  int cmp;

  /* Optimization: There is no need to do canonical composition of each string.
     Decomposition is enough.  */
  if (nf != NULL)
    nf = uninorm_decomposing_form (nf);

  /* Case-fold and normalize S1.  */
  norms1_length = sizeof (buf1) / sizeof (UNIT);
  norms1 = U_CASEFOLD (s1, n1, iso639_language, nf, buf1, &norms1_length);
  if (norms1 == NULL)
    /* errno is set here.  */
    return -1;

  /* Case-fold and normalize S2.  */
  norms2_length = sizeof (buf2) / sizeof (UNIT);
  norms2 = U_CASEFOLD (s2, n2, iso639_language, nf, buf2, &norms2_length);
  if (norms2 == NULL)
    {
      if (norms1 != buf1)
        {
          int saved_errno = errno;
          free (norms1);
          errno = saved_errno;
        }
      return -1;
    }

  /* Compare the normalized strings.  */
  cmp = U_CMP2 (norms1, norms1_length, norms2, norms2_length);
  if (cmp > 0)
    cmp = 1;
  else if (cmp < 0)
    cmp = -1;

  if (norms2 != buf2)
    free (norms2);
  if (norms1 != buf1)
    free (norms1);
  *resultp = cmp;
  return 0;
}
