| 1 | /* Dispatching based on the current locale's character encoding.
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| 2 | Copyright (C) 2018-2022 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU Lesser General Public License as
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| 6 | published by the Free Software Foundation; either version 2.1 of the
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| 7 | License, or (at your option) any later version.
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| 8 |
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| 9 | This file is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* Written by Bruno Haible <bruno@clisp.org>, 2018. */
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| 18 |
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| 19 | #include <config.h>
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| 20 |
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| 21 | /* Specification. */
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| 22 | #include "lc-charset-dispatch.h"
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| 23 |
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| 24 | #if GNULIB_defined_mbstate_t
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| 25 |
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| 26 | # include "localcharset.h"
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| 27 | # include "streq.h"
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| 28 |
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| 29 | # if GNULIB_WCHAR_SINGLE_LOCALE
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| 30 | /* When we know that the locale does not change, provide a speedup by
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| 31 | caching the value of locale_encoding_classification. */
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| 32 | # define locale_encoding_classification_cached locale_encoding_classification
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| 33 | # else
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| 34 | /* By default, don't make assumptions, hence no caching. */
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| 35 | # define locale_encoding_classification_uncached locale_encoding_classification
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| 36 | # endif
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| 37 |
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| 38 | # if GNULIB_WCHAR_SINGLE_LOCALE
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| 39 | static inline
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| 40 | # endif
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| 41 | enc_t
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| 42 | locale_encoding_classification_uncached (void)
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| 43 | {
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| 44 | const char *encoding = locale_charset ();
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| 45 | if (STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0))
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| 46 | return enc_utf8;
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| 47 | if (STREQ_OPT (encoding, "EUC-JP", 'E', 'U', 'C', '-', 'J', 'P', 0, 0, 0))
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| 48 | return enc_eucjp;
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| 49 | if (STREQ_OPT (encoding, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
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| 50 | || STREQ_OPT (encoding, "GB2312", 'G', 'B', '2', '3', '1', '2', 0, 0, 0)
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| 51 | || STREQ_OPT (encoding, "BIG5", 'B', 'I', 'G', '5', 0, 0, 0, 0, 0))
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| 52 | return enc_94;
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| 53 | if (STREQ_OPT (encoding, "EUC-TW", 'E', 'U', 'C', '-', 'T', 'W', 0, 0, 0))
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| 54 | return enc_euctw;
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| 55 | if (STREQ_OPT (encoding, "GB18030", 'G', 'B', '1', '8', '0', '3', '0', 0, 0))
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| 56 | return enc_gb18030;
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| 57 | if (STREQ_OPT (encoding, "SJIS", 'S', 'J', 'I', 'S', 0, 0, 0, 0, 0))
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| 58 | return enc_sjis;
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| 59 | return enc_other;
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| 60 | }
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| 61 |
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| 62 | # if GNULIB_WCHAR_SINGLE_LOCALE
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| 63 |
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| 64 | static int cached_locale_enc = -1;
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| 65 |
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| 66 | enc_t
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| 67 | locale_encoding_classification_cached (void)
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| 68 | {
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| 69 | if (cached_locale_enc < 0)
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| 70 | cached_locale_enc = locale_encoding_classification_uncached ();
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| 71 | return cached_locale_enc;
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| 72 | }
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| 73 |
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| 74 | # endif
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| 75 |
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| 76 | #else
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| 77 |
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| 78 | /* This declaration is solely to ensure that after preprocessing
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| 79 | this file is never empty. */
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| 80 | typedef int dummy;
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| 81 |
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| 82 | #endif
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