summaryrefslogtreecommitdiff
path: root/lib/unicase/u-is-cased.h
blob: bb1749b7c0ab1b53c633db5ed45608aff5b7f6a4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/* Test whether case matters for a Unicode string.
   Copyright (C) 2009-2018 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2009.

   This program is free software: you can redistribute it and/or
   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

int
FUNC (const UNIT *s, size_t n, const char *iso639_language,
      bool *resultp)
{
  UNIT normsbuf[2048 / sizeof (UNIT)];
  UNIT *norms;
  size_t norms_length;
  UNIT mappedbuf[2048 / sizeof (UNIT)];
  UNIT *mapped_toupper;
  UNIT *mapped_tolower;
  UNIT *mapped_totitle;
  size_t mapped_length;

  /* Apply canonical decomposition to S.  */
  norms_length = sizeof (normsbuf) / sizeof (UNIT);
  norms = U_NORMALIZE (UNINORM_NFD, s, n, normsbuf, &norms_length);
  if (norms == NULL)
    /* errno is set here.  */
    return -1;

  mapped_length = sizeof (mappedbuf) / sizeof (UNIT);

  /* Apply toupper mapping.  */
  mapped_toupper = U_TOUPPER (norms, norms_length, iso639_language, NULL,
                              mappedbuf, &mapped_length);
  if (mapped_toupper == NULL)
    goto fail;

  /* Compare.  */
  if (!(mapped_length == norms_length
        && U_CMP (mapped_toupper, norms, norms_length) == 0))
    {
      if (mapped_toupper != mappedbuf)
        free (mapped_toupper);
      goto yes;
    }

  /* Apply tolower mapping.  */
  mapped_tolower = U_TOLOWER (norms, norms_length, iso639_language, NULL,
                              mapped_toupper, &mapped_length);
  if (mapped_tolower == NULL)
    {
      if (mapped_toupper != mappedbuf)
        {
          int saved_errno = errno;
          free (mapped_toupper);
          errno = saved_errno;
        }
      goto fail;
    }

  if (mapped_toupper != mapped_tolower && mapped_toupper != mappedbuf)
    free (mapped_toupper);

  /* Compare.  */
  if (!(mapped_length == norms_length
        && U_CMP (mapped_tolower, norms, norms_length) == 0))
    {
      if (mapped_tolower != mappedbuf)
        free (mapped_tolower);
      goto yes;
    }

  /* Apply totitle mapping.  */
  mapped_totitle = U_TOTITLE (norms, norms_length, iso639_language, NULL,
                              mapped_tolower, &mapped_length);
  if (mapped_totitle == NULL)
    {
      if (mapped_tolower != mappedbuf)
        {
          int saved_errno = errno;
          free (mapped_tolower);
          errno = saved_errno;
        }
      goto fail;
    }

  if (mapped_tolower != mapped_totitle && mapped_tolower != mappedbuf)
    free (mapped_tolower);

  /* Compare.  */
  if (!(mapped_length == norms_length
        && U_CMP (mapped_totitle, norms, norms_length) == 0))
    {
      if (mapped_totitle != mappedbuf)
        free (mapped_totitle);
      goto yes;
    }

  if (mapped_totitle != mappedbuf)
    free (mapped_totitle);
  if (norms != normsbuf)
    free (norms);
  *resultp = false;
  return 0;

 yes:
  if (norms != normsbuf)
    free (norms);
  *resultp = true;
  return 0;

 fail:
  if (norms != normsbuf)
    {
      int saved_errno = errno;
      free (norms);
      errno = saved_errno;
    }
  return -1;
}