1/* Test whether a Unicode string is invariant under a given case mapping.
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
18int
19FUNC (const UNIT *s, size_t n,
20      UNIT * (*mapping) (const UNIT *s, size_t n, const char *iso639_language,
21                         uninorm_t nf,
22                         UNIT *resultbuf, size_t *lengthp),
23      const char *iso639_language,
24      bool *resultp)
25{
26  UNIT normsbuf[2048 / sizeof (UNIT)];
27  UNIT *norms;
28  size_t norms_length;
29  UNIT mappedbuf[2048 / sizeof (UNIT)];
30  UNIT *mapped;
31  size_t mapped_length;
32
33  /* Apply canonical decomposition to S.  */
34  norms_length = sizeof (normsbuf) / sizeof (UNIT);
35  norms = U_NORMALIZE (UNINORM_NFD, s, n, normsbuf, &norms_length);
36  if (norms == NULL)
37    /* errno is set here.  */
38    return -1;
39
40  /* Apply mapping.  */
41  mapped_length = sizeof (mappedbuf) / sizeof (UNIT);
42  mapped = mapping (norms, norms_length, iso639_language, NULL,
43                    mappedbuf, &mapped_length);
44  if (mapped == NULL)
45    {
46      if (norms != normsbuf)
47        {
48          int saved_errno = errno;
49          free (norms);
50          errno = saved_errno;
51        }
52      return -1;
53    }
54
55  /* Compare.  */
56  *resultp = (mapped_length == norms_length
57              && U_CMP (mapped, norms, norms_length) == 0);
58
59  if (mapped != mappedbuf)
60    free (mapped);
61  if (norms != normsbuf)
62    free (norms);
63  return 0;
64}
65