1 /* Dispatching based on the current locale's character encoding.
2 Copyright (C) 2018-2020 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 /* Written by Bruno Haible <bruno@clisp.org>, 2018. */
18
19 #include <config.h>
20
21 /* Specification. */
22 #include "lc-charset-dispatch.h"
23
24 #if GNULIB_defined_mbstate_t
25
26 # include "localcharset.h"
27 # include "streq.h"
28
29 # if GNULIB_WCHAR_SINGLE
30 /* When we know that the locale does not change, provide a speedup by
31 caching the value of locale_encoding_classification. */
32 # define locale_encoding_classification_cached locale_encoding_classification
33 # else
34 /* By default, don't make assumptions, hence no caching. */
35 # define locale_encoding_classification_uncached locale_encoding_classification
36 # endif
37
38 # if GNULIB_WCHAR_SINGLE
39 static inline
40 # endif
41 enc_t
locale_encoding_classification_uncached(void)42 locale_encoding_classification_uncached (void)
43 {
44 const char *encoding = locale_charset ();
45 if (STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0))
46 return enc_utf8;
47 if (STREQ_OPT (encoding, "EUC-JP", 'E', 'U', 'C', '-', 'J', 'P', 0, 0, 0))
48 return enc_eucjp;
49 if (STREQ_OPT (encoding, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
50 || STREQ_OPT (encoding, "GB2312", 'G', 'B', '2', '3', '1', '2', 0, 0, 0)
51 || STREQ_OPT (encoding, "BIG5", 'B', 'I', 'G', '5', 0, 0, 0, 0, 0))
52 return enc_94;
53 if (STREQ_OPT (encoding, "EUC-TW", 'E', 'U', 'C', '-', 'T', 'W', 0, 0, 0))
54 return enc_euctw;
55 if (STREQ_OPT (encoding, "GB18030", 'G', 'B', '1', '8', '0', '3', '0', 0, 0))
56 return enc_gb18030;
57 if (STREQ_OPT (encoding, "SJIS", 'S', 'J', 'I', 'S', 0, 0, 0, 0, 0))
58 return enc_sjis;
59 return enc_other;
60 }
61
62 # if GNULIB_WCHAR_SINGLE
63
64 static int cached_locale_enc = -1;
65
66 enc_t
locale_encoding_classification_cached(void)67 locale_encoding_classification_cached (void)
68 {
69 if (cached_locale_enc < 0)
70 cached_locale_enc = locale_encoding_classification_uncached ();
71 return cached_locale_enc;
72 }
73
74 # endif
75
76 #else
77
78 /* This declaration is solely to ensure that after preprocessing
79 this file is never empty. */
80 typedef int dummy;
81
82 #endif
83