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/* Dispatching based on the current locale's character encoding.
Copyright (C) 2018-2023 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file 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/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2018. */
#include <config.h>
/* Specification. */
#include "lc-charset-dispatch.h"
#if GNULIB_defined_mbstate_t
# include "localcharset.h"
# include "streq.h"
# if GNULIB_WCHAR_SINGLE_LOCALE
/* When we know that the locale does not change, provide a speedup by
caching the value of locale_encoding_classification. */
# define locale_encoding_classification_cached locale_encoding_classification
# else
/* By default, don't make assumptions, hence no caching. */
# define locale_encoding_classification_uncached locale_encoding_classification
# endif
# if GNULIB_WCHAR_SINGLE_LOCALE
static inline
# endif
enc_t
locale_encoding_classification_uncached (void)
{
const char *encoding = locale_charset ();
if (STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0))
return enc_utf8;
if (STREQ_OPT (encoding, "EUC-JP", 'E', 'U', 'C', '-', 'J', 'P', 0, 0, 0))
return enc_eucjp;
if (STREQ_OPT (encoding, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
|| STREQ_OPT (encoding, "GB2312", 'G', 'B', '2', '3', '1', '2', 0, 0, 0)
|| STREQ_OPT (encoding, "BIG5", 'B', 'I', 'G', '5', 0, 0, 0, 0, 0))
return enc_94;
if (STREQ_OPT (encoding, "EUC-TW", 'E', 'U', 'C', '-', 'T', 'W', 0, 0, 0))
return enc_euctw;
if (STREQ_OPT (encoding, "GB18030", 'G', 'B', '1', '8', '0', '3', '0', 0, 0))
return enc_gb18030;
if (STREQ_OPT (encoding, "SJIS", 'S', 'J', 'I', 'S', 0, 0, 0, 0, 0))
return enc_sjis;
return enc_other;
}
# if GNULIB_WCHAR_SINGLE_LOCALE
static int cached_locale_enc = -1;
enc_t
locale_encoding_classification_cached (void)
{
if (cached_locale_enc < 0)
cached_locale_enc = locale_encoding_classification_uncached ();
return cached_locale_enc;
}
# endif
#else
/* This declaration is solely to ensure that after preprocessing
this file is never empty. */
typedef int dummy;
#endif
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