lib/unicase/ulc-casecmp.c

   1 /* Case and normalization insensitive comparison of 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 #include <config.h>
  19
  20 /* Specification.  */
  21 #include "unicase.h"
  22
  23 #include <errno.h>
  24 #include <stdlib.h>
  25
  26 #include "minmax.h"
  27 #include "uninorm.h"
  28 #include "uniconv.h"
  29 #include "unistr.h"
  30
  31 static uint8_t *
  32 ulc_u8_casefold (const char *s, size_t n, const char *iso639_language,
  33                  uninorm_t nf,
  34                  uint8_t *resultbuf, size_t *lengthp)
  35 {
  36   uint8_t convbuf[2048 / sizeof (uint8_t)];
  37   uint8_t *conv;
  38   size_t conv_length;
  39   uint8_t *result;
  40
  41   /* Convert the string to UTF-8.  */
  42   conv_length = sizeof (convbuf) / sizeof (uint8_t);
  43   conv =
  44     u8_conv_from_encoding (locale_charset (), iconveh_error, s, n, NULL,
  45                            convbuf, &conv_length);
  46   if (conv == NULL)
  47     /* errno is set here.  */
  48     return NULL;
  49
  50   /* Case-fold and normalize.  */
  51   result = u8_casefold (conv, conv_length, iso639_language, nf,
  52                         resultbuf, lengthp);
  53   if (result == NULL)
  54     {
  55       if (conv != convbuf)
  56         {
  57           int saved_errno = errno;
  58           free (conv);
  59           errno = saved_errno;
  60         }
  61       return NULL;
  62     }
  63
  64   if (conv != convbuf)
  65     free (conv);
  66   return result;
  67 }
  68
  69 #define FUNC ulc_casecmp
  70 #define UNIT uint8_t
  71 #define SRC_UNIT char
  72 #define U_CASEFOLD ulc_u8_casefold
  73 #define U_CMP2 u8_cmp2
  74 #include "u-casecmp.h"