83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
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/* Dispatching based on the current locale's character encoding.
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Copyright (C) 2018-2023 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2018. */
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#include <config.h>
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/* Specification. */
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#include "lc-charset-dispatch.h"
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#if GNULIB_defined_mbstate_t
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# include "localcharset.h"
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# include "streq.h"
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# if GNULIB_WCHAR_SINGLE_LOCALE
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/* When we know that the locale does not change, provide a speedup by
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caching the value of locale_encoding_classification. */
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# define locale_encoding_classification_cached locale_encoding_classification
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# else
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/* By default, don't make assumptions, hence no caching. */
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# define locale_encoding_classification_uncached locale_encoding_classification
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# endif
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# if GNULIB_WCHAR_SINGLE_LOCALE
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static inline
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# endif
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enc_t
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locale_encoding_classification_uncached (void)
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{
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const char *encoding = locale_charset ();
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if (STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0))
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return enc_utf8;
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if (STREQ_OPT (encoding, "EUC-JP", 'E', 'U', 'C', '-', 'J', 'P', 0, 0, 0))
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return enc_eucjp;
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if (STREQ_OPT (encoding, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
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|| STREQ_OPT (encoding, "GB2312", 'G', 'B', '2', '3', '1', '2', 0, 0, 0)
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|| STREQ_OPT (encoding, "BIG5", 'B', 'I', 'G', '5', 0, 0, 0, 0, 0))
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return enc_94;
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if (STREQ_OPT (encoding, "EUC-TW", 'E', 'U', 'C', '-', 'T', 'W', 0, 0, 0))
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return enc_euctw;
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if (STREQ_OPT (encoding, "GB18030", 'G', 'B', '1', '8', '0', '3', '0', 0, 0))
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return enc_gb18030;
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if (STREQ_OPT (encoding, "SJIS", 'S', 'J', 'I', 'S', 0, 0, 0, 0, 0))
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return enc_sjis;
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return enc_other;
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}
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# if GNULIB_WCHAR_SINGLE_LOCALE
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static int cached_locale_enc = -1;
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enc_t
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locale_encoding_classification_cached (void)
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{
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if (cached_locale_enc < 0)
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cached_locale_enc = locale_encoding_classification_uncached ();
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return cached_locale_enc;
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}
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# endif
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#else
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/* This declaration is solely to ensure that after preprocessing
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this file is never empty. */
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typedef int dummy;
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#endif
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