lib/uninorm/u-normcmp.h

   1 /* Normalization insensitive comparison of Unicode strings.
   2    Copyright (C) 2009-2019 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2009.
   4
   5    This program is free software: you can redistribute it and/or modify it
   6    under the terms of the GNU Lesser General Public License as published
   7    by the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 int
  19 FUNC (const UNIT *s1, size_t n1, const UNIT *s2, size_t n2,
  20       uninorm_t nf, int *resultp)
  21 {
  22   UNIT buf1[2048 / sizeof (UNIT)];
  23   UNIT buf2[2048 / sizeof (UNIT)];
  24   UNIT *norms1;
  25   size_t norms1_length;
  26   UNIT *norms2;
  27   size_t norms2_length;
  28   int cmp;
  29
  30   /* Normalize S1.  */
  31   norms1_length = sizeof (buf1) / sizeof (UNIT);
  32   norms1 = U_NORMALIZE (nf, s1, n1, buf1, &norms1_length);
  33   if (norms1 == NULL)
  34     /* errno is set here.  */
  35     return -1;
  36
  37   /* Normalize S2.  */
  38   norms2_length = sizeof (buf2) / sizeof (UNIT);
  39   norms2 = U_NORMALIZE (nf, s2, n2, buf2, &norms2_length);
  40   if (norms2 == NULL)
  41     {
  42       if (norms1 != buf1)
  43         {
  44           int saved_errno = errno;
  45           free (norms1);
  46           errno = saved_errno;
  47         }
  48       return -1;
  49     }
  50
  51   /* Compare the normalized strings.  */
  52   cmp = U_CMP2 (norms1, norms1_length, norms2, norms2_length);
  53   if (cmp > 0)
  54     cmp = 1;
  55   else if (cmp < 0)
  56     cmp = -1;
  57
  58   if (norms2 != buf2)
  59     free (norms2);
  60   if (norms1 != buf1)
  61     free (norms1);
  62   *resultp = cmp;
  63   return 0;
  64 }