1/* Locale dependent transformation for case insensitive comparison of strings.
2   Copyright (C) 2009-2010 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 <http://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 "uniconv.h"
27
28char *
29ulc_casexfrm (const char *s, size_t n, const char *iso639_language,
30              uninorm_t nf,
31              char *resultbuf, size_t *lengthp)
32{
33  uint8_t convbuf[2048 / sizeof (uint8_t)];
34  uint8_t *conv;
35  size_t conv_length;
36  char *result;
37
38  /* Convert the string to UTF-8.  */
39  conv_length = sizeof (convbuf) / sizeof (uint8_t);
40  conv =
41    u8_conv_from_encoding (locale_charset (), iconveh_error, s, n, NULL,
42                           convbuf, &conv_length);
43  if (conv == NULL)
44    /* errno is set here.  */
45    return NULL;
46
47  /* Case-fold and normalize.  */
48  result = u8_casexfrm (conv, conv_length, iso639_language, nf,
49                        resultbuf, lengthp);
50  if (result == NULL)
51    {
52      if (conv != convbuf)
53        {
54          int saved_errno = errno;
55          free (conv);
56          errno = saved_errno;
57        }
58      return NULL;
59    }
60
61  if (conv != convbuf)
62    free (conv);
63  return result;
64}
65