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Diffstat (limited to 'gnulib/import/lc-charset-dispatch.c')
-rw-r--r-- | gnulib/import/lc-charset-dispatch.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/gnulib/import/lc-charset-dispatch.c b/gnulib/import/lc-charset-dispatch.c new file mode 100644 index 0000000..79057d4 --- /dev/null +++ b/gnulib/import/lc-charset-dispatch.c @@ -0,0 +1,82 @@ +/* Dispatching based on the current locale's character encoding. + Copyright (C) 2018-2020 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + 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 General Public License for more details. + + You should have received a copy of the GNU 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 +/* 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 +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 + +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 |