1/* Locale dependent transformation for comparison of Unicode 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
18char *
19FUNC (const UNIT *s, size_t n, uninorm_t nf,
20      char *resultbuf, size_t *lengthp)
21{
22  UNIT normsbuf[2048 / sizeof (UNIT)];
23  UNIT *norms;
24  size_t norms_length;
25  char convsbuf[2048];
26  char *convs;
27  size_t convs_length;
28  char *result;
29
30  /* Normalize the Unicode string.  */
31  norms_length = sizeof (normsbuf) / sizeof (UNIT);
32  norms = U_NORMALIZE (nf, s, n, normsbuf, &norms_length);
33  if (norms == NULL)
34    /* errno is set here.  */
35    return NULL;
36
37  /* Convert it to locale encoding.  */
38  convs_length = sizeof (convsbuf) - 1;
39  convs = U_CONV_TO_ENCODING (locale_charset (),
40                              iconveh_error,
41                              norms, norms_length,
42                              NULL,
43                              convsbuf, &convs_length);
44  if (convs == NULL)
45    {
46      if (norms != normsbuf)
47        {
48          int saved_errno = errno;
49          free (norms);
50          errno = saved_errno;
51        }
52      return NULL;
53    }
54
55  if (norms != normsbuf)
56    free (norms);
57
58  /* Ensure one more byte is available.  */
59  if (convs != convsbuf)
60    {
61      char *memory = (char *) realloc (convs, convs_length + 1);
62      if (memory == NULL)
63        {
64          free (convs);
65          errno = ENOMEM;
66          return NULL;
67        }
68      convs = memory;
69    }
70
71  /* Apply locale dependent transformations for comparison.  */
72  result = memxfrm (convs, convs_length, resultbuf, lengthp);
73  if (result == NULL)
74    {
75      if (convs != convsbuf)
76        {
77          int saved_errno = errno;
78          free (convs);
79          errno = saved_errno;
80        }
81      return NULL;
82    }
83
84  if (convs != convsbuf)
85    free (convs);
86  return result;
87}
88