/* Determine a canonical name for the current locale's character encoding.

   Copyright (C) 2000-2006, 2008-2018 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, 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>.  */

#include <config.h>

/* Specification.  */

#include "localcharset.h"

#include <stddef.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#if defined __APPLE__ && defined __MACH__ && HAVE_LANGINFO_CODESET

# define DARWIN7 /* Darwin 7 or newer, i.e. Mac OS X 10.3 or newer */

#endif

#if defined _WIN32 && !defined __CYGWIN__

# define WINDOWS_NATIVE

# include <locale.h>

#endif

#if defined __EMX__

/* Assume EMX program runs on OS/2, even if compiled under DOS.  */

# ifndef OS2

#  define OS2

# endif

#endif

#if !defined WINDOWS_NATIVE

# if HAVE_LANGINFO_CODESET

#  include <langinfo.h>

# else

#  if 0 /* see comment regarding use of setlocale(), below */

#   include <locale.h>

#  endif

# endif

# ifdef __CYGWIN__

#  define WIN32_LEAN_AND_MEAN

#  include <windows.h>

# endif

#elif defined WINDOWS_NATIVE

# define WIN32_LEAN_AND_MEAN

# include <windows.h>

#endif

#if defined OS2

# define INCL_DOS

# include <os2.h>

#endif

/* For MB_CUR_MAX_L */

#if defined DARWIN7

# include <xlocale.h>

#endif

#if HAVE_LANGINFO_CODESET || defined WINDOWS_NATIVE || defined OS2

/* On these platforms, we use a mapping from non-canonical encoding name

   to GNU canonical encoding name.  */

/* With glibc-2.1 or newer, we don't need any canonicalization,

   because glibc has iconv and both glibc and libiconv support all

   GNU canonical names directly.  */

# if !((defined __GNU_LIBRARY__ && __GLIBC__ >= 2) || defined __UCLIBC__)

struct table_entry

{

  const char alias[11+1];

  const char canonical[11+1];

};

/* Table of platform-dependent mappings, sorted in ascending order.  */

static const struct table_entry alias_table[] =

  {

#  if defined __FreeBSD__                                   /* FreeBSD */

  /*{ "ARMSCII-8",  "ARMSCII-8" },*/

    { "Big5",       "BIG5" },

    { "C",          "ASCII" },

  /*{ "CP1131",     "CP1131" },*/

  /*{ "CP1251",     "CP1251" },*/

  /*{ "CP866",      "CP866" },*/

  /*{ "GB18030",    "GB18030" },*/

  /*{ "GB2312",     "GB2312" },*/

  /*{ "GBK",        "GBK" },*/

  /*{ "ISCII-DEV",  "?" },*/

    { "ISO8859-1",  "ISO-8859-1" },

    { "ISO8859-13", "ISO-8859-13" },

    { "ISO8859-15", "ISO-8859-15" },

    { "ISO8859-2",  "ISO-8859-2" },

    { "ISO8859-5",  "ISO-8859-5" },

    { "ISO8859-7",  "ISO-8859-7" },

    { "ISO8859-9",  "ISO-8859-9" },

  /*{ "KOI8-R",     "KOI8-R" },*/

  /*{ "KOI8-U",     "KOI8-U" },*/

    { "SJIS",       "SHIFT_JIS" },

    { "US-ASCII",   "ASCII" },

    { "eucCN",      "GB2312" },

    { "eucJP",      "EUC-JP" },

    { "eucKR",      "EUC-KR" }

#   define alias_table_defined

#  endif

#  if defined __NetBSD__                                    /* NetBSD */

    { "646",        "ASCII" },

  /*{ "ARMSCII-8",  "ARMSCII-8" },*/

  /*{ "BIG5",       "BIG5" },*/

    { "Big5-HKSCS", "BIG5-HKSCS" },

  /*{ "CP1251",     "CP1251" },*/

  /*{ "CP866",      "CP866" },*/

  /*{ "GB18030",    "GB18030" },*/

  /*{ "GB2312",     "GB2312" },*/

    { "ISO8859-1",  "ISO-8859-1" },

    { "ISO8859-13", "ISO-8859-13" },

    { "ISO8859-15", "ISO-8859-15" },

    { "ISO8859-2",  "ISO-8859-2" },

    { "ISO8859-4",  "ISO-8859-4" },

    { "ISO8859-5",  "ISO-8859-5" },

    { "ISO8859-7",  "ISO-8859-7" },

  /*{ "KOI8-R",     "KOI8-R" },*/

  /*{ "KOI8-U",     "KOI8-U" },*/

  /*{ "PT154",      "PT154" },*/

    { "SJIS",       "SHIFT_JIS" },

    { "eucCN",      "GB2312" },

    { "eucJP",      "EUC-JP" },

    { "eucKR",      "EUC-KR" },

    { "eucTW",      "EUC-TW" }

#   define alias_table_defined

#  endif

#  if defined __OpenBSD__                                   /* OpenBSD */

    { "646",        "ASCII" },

    { "ISO8859-1",  "ISO-8859-1" },

    { "ISO8859-13", "ISO-8859-13" },

    { "ISO8859-15", "ISO-8859-15" },

    { "ISO8859-2",  "ISO-8859-2" },

    { "ISO8859-4",  "ISO-8859-4" },

    { "ISO8859-5",  "ISO-8859-5" },

    { "ISO8859-7",  "ISO-8859-7" }

#   define alias_table_defined

#  endif

#  if defined __APPLE__ && defined __MACH__                 /* Mac OS X */

    /* Darwin 7.5 has nl_langinfo(CODESET), but sometimes its value is

       useless:

       - It returns the empty string when LANG is set to a locale of the

         form ll_CC, although ll_CC/LC_CTYPE is a symlink to an UTF-8

         LC_CTYPE file.

       - The environment variables LANG, LC_CTYPE, LC_ALL are not set by

         the system; nl_langinfo(CODESET) returns "US-ASCII" in this case.

       - The documentation says:

           "... all code that calls BSD system routines should ensure

            that the const *char parameters of these routines are in UTF-8

            encoding. All BSD system functions expect their string

            parameters to be in UTF-8 encoding and nothing else."

         It also says

           "An additional caveat is that string parameters for files,

            paths, and other file-system entities must be in canonical

            UTF-8. In a canonical UTF-8 Unicode string, all decomposable

            characters are decomposed ..."

         but this is not true: You can pass non-decomposed UTF-8 strings

         to file system functions, and it is the OS which will convert

         them to decomposed UTF-8 before accessing the file system.

       - The Apple Terminal application displays UTF-8 by default.

       - However, other applications are free to use different encodings:

         - xterm uses ISO-8859-1 by default.

         - TextEdit uses MacRoman by default.

       We prefer UTF-8 over decomposed UTF-8-MAC because one should

       minimize the use of decomposed Unicode. Unfortunately, through the

       Darwin file system, decomposed UTF-8 strings are leaked into user

       space nevertheless.

       Then there are also the locales with encodings other than US-ASCII

       and UTF-8. These locales can be occasionally useful to users (e.g.

       when grepping through ISO-8859-1 encoded text files), when all their

       file names are in US-ASCII.

     */

    { "ARMSCII-8",  "ARMSCII-8" },

    { "Big5",       "BIG5" },

    { "Big5HKSCS",  "BIG5-HKSCS" },

    { "CP1131",     "CP1131" },

    { "CP1251",     "CP1251" },

    { "CP866",      "CP866" },

    { "CP949",      "CP949" },

    { "GB18030",    "GB18030" },

    { "GB2312",     "GB2312" },

    { "GBK",        "GBK" },

  /*{ "ISCII-DEV",  "?" },*/

    { "ISO8859-1",  "ISO-8859-1" },

    { "ISO8859-13", "ISO-8859-13" },

    { "ISO8859-15", "ISO-8859-15" },

    { "ISO8859-2",  "ISO-8859-2" },

    { "ISO8859-4",  "ISO-8859-4" },

    { "ISO8859-5",  "ISO-8859-5" },

    { "ISO8859-7",  "ISO-8859-7" },

    { "ISO8859-9",  "ISO-8859-9" },

    { "KOI8-R",     "KOI8-R" },

    { "KOI8-U",     "KOI8-U" },

    { "PT154",      "PT154" },

    { "SJIS",       "SHIFT_JIS" },

    { "eucCN",      "GB2312" },

    { "eucJP",      "EUC-JP" },

    { "eucKR",      "EUC-KR" }

#   define alias_table_defined

#  endif

#  if defined _AIX                                          /* AIX */

  /*{ "GBK",        "GBK" },*/

    { "IBM-1046",   "CP1046" },

    { "IBM-1124",   "CP1124" },

    { "IBM-1129",   "CP1129" },

    { "IBM-1252",   "CP1252" },

    { "IBM-850",    "CP850" },

    { "IBM-856",    "CP856" },

    { "IBM-921",    "ISO-8859-13" },

    { "IBM-922",    "CP922" },

    { "IBM-932",    "CP932" },

    { "IBM-943",    "CP943" },

    { "IBM-eucCN",  "GB2312" },

    { "IBM-eucJP",  "EUC-JP" },

    { "IBM-eucKR",  "EUC-KR" },

    { "IBM-eucTW",  "EUC-TW" },

    { "ISO8859-1",  "ISO-8859-1" },

    { "ISO8859-15", "ISO-8859-15" },

    { "ISO8859-2",  "ISO-8859-2" },

    { "ISO8859-5",  "ISO-8859-5" },

    { "ISO8859-6",  "ISO-8859-6" },

    { "ISO8859-7",  "ISO-8859-7" },

    { "ISO8859-8",  "ISO-8859-8" },

    { "ISO8859-9",  "ISO-8859-9" },

    { "TIS-620",    "TIS-620" },

  /*{ "UTF-8",      "UTF-8" },*/

    { "big5",       "BIG5" }

#   define alias_table_defined

#  endif

#  if defined __hpux                                        /* HP-UX */

    { "SJIS",      "SHIFT_JIS" },

    { "arabic8",   "HP-ARABIC8" },

    { "big5",      "BIG5" },

    { "cp1251",    "CP1251" },

    { "eucJP",     "EUC-JP" },

    { "eucKR",     "EUC-KR" },

    { "eucTW",     "EUC-TW" },

    { "gb18030",   "GB18030" },

    { "greek8",    "HP-GREEK8" },

    { "hebrew8",   "HP-HEBREW8" },

    { "hkbig5",    "BIG5-HKSCS" },

    { "hp15CN",    "GB2312" },

    { "iso88591",  "ISO-8859-1" },

    { "iso885913", "ISO-8859-13" },

    { "iso885915", "ISO-8859-15" },

    { "iso88592",  "ISO-8859-2" },

    { "iso88594",  "ISO-8859-4" },

    { "iso88595",  "ISO-8859-5" },

    { "iso88596",  "ISO-8859-6" },

    { "iso88597",  "ISO-8859-7" },

    { "iso88598",  "ISO-8859-8" },

    { "iso88599",  "ISO-8859-9" },

    { "kana8",     "HP-KANA8" },

    { "koi8r",     "KOI8-R" },

    { "roman8",    "HP-ROMAN8" },

    { "tis620",    "TIS-620" },

    { "turkish8",  "HP-TURKISH8" },

    { "utf8",      "UTF-8" }

#   define alias_table_defined

#  endif

#  if defined __sgi                                         /* IRIX */

    { "ISO8859-1",  "ISO-8859-1" },

    { "ISO8859-15", "ISO-8859-15" },

    { "ISO8859-2",  "ISO-8859-2" },

    { "ISO8859-5",  "ISO-8859-5" },

    { "ISO8859-7",  "ISO-8859-7" },

    { "ISO8859-9",  "ISO-8859-9" },

    { "eucCN",      "GB2312" },

    { "eucJP",      "EUC-JP" },

    { "eucKR",      "EUC-KR" },

    { "eucTW",      "EUC-TW" }

#   define alias_table_defined

#  endif

#  if defined __osf__                                       /* OSF/1 */

  /*{ "GBK",        "GBK" },*/

    { "ISO8859-1",  "ISO-8859-1" },

    { "ISO8859-15", "ISO-8859-15" },

    { "ISO8859-2",  "ISO-8859-2" },

    { "ISO8859-4",  "ISO-8859-4" },

    { "ISO8859-5",  "ISO-8859-5" },

    { "ISO8859-7",  "ISO-8859-7" },

    { "ISO8859-8",  "ISO-8859-8" },

    { "ISO8859-9",  "ISO-8859-9" },

    { "KSC5601",    "CP949" },

    { "SJIS",       "SHIFT_JIS" },

    { "TACTIS",     "TIS-620" },

  /*{ "UTF-8",      "UTF-8" },*/

    { "big5",       "BIG5" },

    { "cp850",      "CP850" },

    { "dechanyu",   "DEC-HANYU" },

    { "dechanzi",   "GB2312" },

    { "deckanji",   "DEC-KANJI" },

    { "deckorean",  "EUC-KR" },

    { "eucJP",      "EUC-JP" },

    { "eucKR",      "EUC-KR" },

    { "eucTW",      "EUC-TW" },

    { "sdeckanji",  "EUC-JP" }

#   define alias_table_defined

#  endif

#  if defined __sun                                         /* Solaris */

    { "5601",        "EUC-KR" },

    { "646",         "ASCII" },

  /*{ "BIG5",        "BIG5" },*/

    { "Big5-HKSCS",  "BIG5-HKSCS" },

    { "GB18030",     "GB18030" },

  /*{ "GBK",         "GBK" },*/

    { "ISO8859-1",   "ISO-8859-1" },

    { "ISO8859-11",  "TIS-620" },

    { "ISO8859-13",  "ISO-8859-13" },

    { "ISO8859-15",  "ISO-8859-15" },

    { "ISO8859-2",   "ISO-8859-2" },

    { "ISO8859-3",   "ISO-8859-3" },

    { "ISO8859-4",   "ISO-8859-4" },

    { "ISO8859-5",   "ISO-8859-5" },

    { "ISO8859-6",   "ISO-8859-6" },

    { "ISO8859-7",   "ISO-8859-7" },

    { "ISO8859-8",   "ISO-8859-8" },

    { "ISO8859-9",   "ISO-8859-9" },

    { "PCK",         "SHIFT_JIS" },

    { "TIS620.2533", "TIS-620" },

  /*{ "UTF-8",       "UTF-8" },*/

    { "ansi-1251",   "CP1251" },

    { "cns11643",    "EUC-TW" },

    { "eucJP",       "EUC-JP" },

    { "gb2312",      "GB2312" },

    { "koi8-r",      "KOI8-R" }

#   define alias_table_defined

#  endif

#  if defined __minix                                       /* Minix */

    { "646", "ASCII" }

#   define alias_table_defined

#  endif

#  if defined WINDOWS_NATIVE || defined __CYGWIN__          /* Windows */

    { "CP1361",  "JOHAB" },

    { "CP20127", "ASCII" },

    { "CP20866", "KOI8-R" },

    { "CP20936", "GB2312" },

    { "CP21866", "KOI8-RU" },

    { "CP28591", "ISO-8859-1" },

    { "CP28592", "ISO-8859-2" },

    { "CP28593", "ISO-8859-3" },

    { "CP28594", "ISO-8859-4" },

    { "CP28595", "ISO-8859-5" },

    { "CP28596", "ISO-8859-6" },

    { "CP28597", "ISO-8859-7" },

    { "CP28598", "ISO-8859-8" },

    { "CP28599", "ISO-8859-9" },

    { "CP28605", "ISO-8859-15" },

    { "CP38598", "ISO-8859-8" },

    { "CP51932", "EUC-JP" },

    { "CP51936", "GB2312" },

    { "CP51949", "EUC-KR" },

    { "CP51950", "EUC-TW" },

    { "CP54936", "GB18030" },

    { "CP65001", "UTF-8" },

    { "CP936",   "GBK" }

#   define alias_table_defined

#  endif

#  if defined OS2                                           /* OS/2 */

    /* The list of encodings is taken from "List of OS/2 Codepages"

       by Alex Taylor:

       <http://altsan.org/os2/toolkits/uls/index.html#codepages>.

       See also "IBM Globalization - Code page identifiers":

       <https://www-01.ibm.com/software/globalization/cp/cp_cpgid.html>.  */

    { "CP1089", "ISO-8859-6" },

    { "CP1208", "UTF-8" },

    { "CP1381", "GB2312" },

    { "CP1386", "GBK" },

    { "CP3372", "EUC-JP" },

    { "CP813",  "ISO-8859-7" },

    { "CP819",  "ISO-8859-1" },

    { "CP878",  "KOI8-R" },

    { "CP912",  "ISO-8859-2" },

    { "CP913",  "ISO-8859-3" },

    { "CP914",  "ISO-8859-4" },

    { "CP915",  "ISO-8859-5" },

    { "CP916",  "ISO-8859-8" },

    { "CP920",  "ISO-8859-9" },

    { "CP921",  "ISO-8859-13" },

    { "CP923",  "ISO-8859-15" },

    { "CP954",  "EUC-JP" },

    { "CP964",  "EUC-TW" },

    { "CP970",  "EUC-KR" }

#   define alias_table_defined

#  endif

#  if defined VMS                                           /* OpenVMS */

    /* The list of encodings is taken from the OpenVMS 7.3-1 documentation

       "Compaq C Run-Time Library Reference Manual for OpenVMS systems"

       section 10.7 "Handling Different Character Sets".  */

    { "DECHANYU",  "DEC-HANYU" },

    { "DECHANZI",  "GB2312" },

    { "DECKANJI",  "DEC-KANJI" },

    { "DECKOREAN", "EUC-KR" },

    { "ISO8859-1", "ISO-8859-1" },

    { "ISO8859-2", "ISO-8859-2" },

    { "ISO8859-5", "ISO-8859-5" },

    { "ISO8859-7", "ISO-8859-7" },

    { "ISO8859-8", "ISO-8859-8" },

    { "ISO8859-9", "ISO-8859-9" },

    { "SDECKANJI", "EUC-JP" },

    { "SJIS",      "SHIFT_JIS" },

    { "eucJP",     "EUC-JP" },

    { "eucTW",     "EUC-TW" }

#   define alias_table_defined

#  endif

#  ifndef alias_table_defined

    /* Just a dummy entry, to avoid a C syntax error.  */

    { "", "" }

#  endif

  };

# endif

#else

/* On these platforms, we use a mapping from locale name to GNU canonical

   encoding name.  */

struct table_entry

{

  const char locale[17+1];

  const char canonical[11+1];

};

/* Table of platform-dependent mappings, sorted in ascending order.  */

static const struct table_entry locale_table[] =

  {

# if defined __FreeBSD__                                    /* FreeBSD 4.2 */

    { "cs_CZ.ISO_8859-2",  "ISO-8859-2" },

    { "da_DK.DIS_8859-15", "ISO-8859-15" },

    { "da_DK.ISO_8859-1",  "ISO-8859-1" },

    { "de_AT.DIS_8859-15", "ISO-8859-15" },

    { "de_AT.ISO_8859-1",  "ISO-8859-1" },

    { "de_CH.DIS_8859-15", "ISO-8859-15" },

    { "de_CH.ISO_8859-1",  "ISO-8859-1" },

    { "de_DE.DIS_8859-15", "ISO-8859-15" },

    { "de_DE.ISO_8859-1",  "ISO-8859-1" },

    { "en_AU.DIS_8859-15", "ISO-8859-15" },

    { "en_AU.ISO_8859-1",  "ISO-8859-1" },

    { "en_CA.DIS_8859-15", "ISO-8859-15" },

    { "en_CA.ISO_8859-1",  "ISO-8859-1" },

    { "en_GB.DIS_8859-15", "ISO-8859-15" },

    { "en_GB.ISO_8859-1",  "ISO-8859-1" },

    { "en_US.DIS_8859-15", "ISO-8859-15" },

    { "en_US.ISO_8859-1",  "ISO-8859-1" },

    { "es_ES.DIS_8859-15", "ISO-8859-15" },

    { "es_ES.ISO_8859-1",  "ISO-8859-1" },

    { "fi_FI.DIS_8859-15", "ISO-8859-15" },

    { "fi_FI.ISO_8859-1",  "ISO-8859-1" },

    { "fr_BE.DIS_8859-15", "ISO-8859-15" },

    { "fr_BE.ISO_8859-1",  "ISO-8859-1" },

    { "fr_CA.DIS_8859-15", "ISO-8859-15" },

    { "fr_CA.ISO_8859-1",  "ISO-8859-1" },

    { "fr_CH.DIS_8859-15", "ISO-8859-15" },

    { "fr_CH.ISO_8859-1",  "ISO-8859-1" },

    { "fr_FR.DIS_8859-15", "ISO-8859-15" },

    { "fr_FR.ISO_8859-1",  "ISO-8859-1" },

    { "hr_HR.ISO_8859-2",  "ISO-8859-2" },

    { "hu_HU.ISO_8859-2",  "ISO-8859-2" },

    { "is_IS.DIS_8859-15", "ISO-8859-15" },

    { "is_IS.ISO_8859-1",  "ISO-8859-1" },

    { "it_CH.DIS_8859-15", "ISO-8859-15" },

    { "it_CH.ISO_8859-1",  "ISO-8859-1" },

    { "it_IT.DIS_8859-15", "ISO-8859-15" },

    { "it_IT.ISO_8859-1",  "ISO-8859-1" },

    { "ja_JP.EUC",         "EUC-JP" },

    { "ja_JP.SJIS",        "SHIFT_JIS" },

    { "ja_JP.Shift_JIS",   "SHIFT_JIS" },

    { "ko_KR.EUC",         "EUC-KR" },

    { "la_LN.ASCII",       "ASCII" },

    { "la_LN.DIS_8859-15", "ISO-8859-15" },

    { "la_LN.ISO_8859-1",  "ISO-8859-1" },

    { "la_LN.ISO_8859-2",  "ISO-8859-2" },

    { "la_LN.ISO_8859-4",  "ISO-8859-4" },

    { "lt_LN.ASCII",       "ASCII" },

    { "lt_LN.DIS_8859-15", "ISO-8859-15" },

    { "lt_LN.ISO_8859-1",  "ISO-8859-1" },

    { "lt_LN.ISO_8859-2",  "ISO-8859-2" },

    { "lt_LT.ISO_8859-4",  "ISO-8859-4" },

    { "nl_BE.DIS_8859-15", "ISO-8859-15" },

    { "nl_BE.ISO_8859-1",  "ISO-8859-1" },

    { "nl_NL.DIS_8859-15", "ISO-8859-15" },

    { "nl_NL.ISO_8859-1",  "ISO-8859-1" },

    { "no_NO.DIS_8859-15", "ISO-8859-15" },

    { "no_NO.ISO_8859-1",  "ISO-8859-1" },

    { "pl_PL.ISO_8859-2",  "ISO-8859-2" },

    { "pt_PT.DIS_8859-15", "ISO-8859-15" },

    { "pt_PT.ISO_8859-1",  "ISO-8859-1" },

    { "ru_RU.CP866",       "CP866" },

    { "ru_RU.ISO_8859-5",  "ISO-8859-5" },

    { "ru_RU.KOI8-R",      "KOI8-R" },

    { "ru_SU.CP866",       "CP866" },

    { "ru_SU.ISO_8859-5",  "ISO-8859-5" },

    { "ru_SU.KOI8-R",      "KOI8-R" },

    { "sl_SI.ISO_8859-2",  "ISO-8859-2" },

    { "sv_SE.DIS_8859-15", "ISO-8859-15" },

    { "sv_SE.ISO_8859-1",  "ISO-8859-1" },

    { "uk_UA.KOI8-U",      "KOI8-U" },

    { "zh_CN.EUC",         "GB2312" },

    { "zh_TW.BIG5",        "BIG5" },

    { "zh_TW.Big5",        "BIG5" }

#  define locale_table_defined

# endif

# if defined __DJGPP__                                      /* DOS / DJGPP 2.03 */

    /* The encodings given here may not all be correct.

       If you find that the encoding given for your language and

       country is not the one your DOS machine actually uses, just

       correct it in this file, and send a mail to

       Juan Manuel Guerrero <juan.guerrero@gmx.de>

       and <bug-gnulib@gnu.org>.  */

    { "C",     "ASCII" },

    { "ar",    "CP864" },

    { "ar_AE", "CP864" },

    { "ar_DZ", "CP864" },

    { "ar_EG", "CP864" },

    { "ar_IQ", "CP864" },

    { "ar_IR", "CP864" },

    { "ar_JO", "CP864" },

    { "ar_KW", "CP864" },

    { "ar_MA", "CP864" },

    { "ar_OM", "CP864" },

    { "ar_QA", "CP864" },

    { "ar_SA", "CP864" },

    { "ar_SY", "CP864" },

    { "be",    "CP866" },

    { "be_BE", "CP866" },

    { "bg",    "CP866" }, /* not CP855 ?? */

    { "bg_BG", "CP866" }, /* not CP855 ?? */

    { "ca",    "CP850" },

    { "ca_ES", "CP850" },

    { "cs",    "CP852" },

    { "cs_CZ", "CP852" },

    { "da",    "CP865" }, /* not CP850 ?? */

    { "da_DK", "CP865" }, /* not CP850 ?? */

    { "de",    "CP850" },

    { "de_AT", "CP850" },

    { "de_CH", "CP850" },

    { "de_DE", "CP850" },

    { "el",    "CP869" },

    { "el_GR", "CP869" },

    { "en",    "CP850" },

    { "en_AU", "CP850" }, /* not CP437 ?? */

    { "en_CA", "CP850" },

    { "en_GB", "CP850" },

    { "en_NZ", "CP437" },

    { "en_US", "CP437" },

    { "en_ZA", "CP850" }, /* not CP437 ?? */

    { "eo",    "CP850" },

    { "eo_EO", "CP850" },

    { "es",    "CP850" },

    { "es_AR", "CP850" },

    { "es_BO", "CP850" },

    { "es_CL", "CP850" },

    { "es_CO", "CP850" },

    { "es_CR", "CP850" },

    { "es_CU", "CP850" },

    { "es_DO", "CP850" },

    { "es_EC", "CP850" },

    { "es_ES", "CP850" },

    { "es_GT", "CP850" },

    { "es_HN", "CP850" },

    { "es_MX", "CP850" },

    { "es_NI", "CP850" },

    { "es_PA", "CP850" },

    { "es_PE", "CP850" },

    { "es_PY", "CP850" },

    { "es_SV", "CP850" },

    { "es_UY", "CP850" },

    { "es_VE", "CP850" },

    { "et",    "CP850" },

    { "et_EE", "CP850" },

    { "eu",    "CP850" },

    { "eu_ES", "CP850" },

    { "fi",    "CP850" },

    { "fi_FI", "CP850" },

    { "fr",    "CP850" },

    { "fr_BE", "CP850" },

    { "fr_CA", "CP850" },

    { "fr_CH", "CP850" },

    { "fr_FR", "CP850" },

    { "ga",    "CP850" },

    { "ga_IE", "CP850" },

    { "gd",    "CP850" },

    { "gd_GB", "CP850" },

    { "gl",    "CP850" },

    { "gl_ES", "CP850" },

    { "he",    "CP862" },

    { "he_IL", "CP862" },

    { "hr",    "CP852" },

    { "hr_HR", "CP852" },

    { "hu",    "CP852" },

    { "hu_HU", "CP852" },

    { "id",    "CP850" }, /* not CP437 ?? */

    { "id_ID", "CP850" }, /* not CP437 ?? */

    { "is",    "CP861" }, /* not CP850 ?? */

    { "is_IS", "CP861" }, /* not CP850 ?? */

    { "it",    "CP850" },

    { "it_CH", "CP850" },

    { "it_IT", "CP850" },

    { "ja",    "CP932" },

    { "ja_JP", "CP932" },

    { "kr",    "CP949" }, /* not CP934 ?? */

    { "kr_KR", "CP949" }, /* not CP934 ?? */

    { "lt",    "CP775" },

    { "lt_LT", "CP775" },

    { "lv",    "CP775" },

    { "lv_LV", "CP775" },

    { "mk",    "CP866" }, /* not CP855 ?? */

    { "mk_MK", "CP866" }, /* not CP855 ?? */

    { "mt",    "CP850" },

    { "mt_MT", "CP850" },

    { "nb",    "CP865" }, /* not CP850 ?? */

    { "nb_NO", "CP865" }, /* not CP850 ?? */

    { "nl",    "CP850" },

    { "nl_BE", "CP850" },

    { "nl_NL", "CP850" },

    { "nn",    "CP865" }, /* not CP850 ?? */

    { "nn_NO", "CP865" }, /* not CP850 ?? */

    { "no",    "CP865" }, /* not CP850 ?? */

    { "no_NO", "CP865" }, /* not CP850 ?? */

    { "pl",    "CP852" },

    { "pl_PL", "CP852" },

    { "pt",    "CP850" },

    { "pt_BR", "CP850" },

    { "pt_PT", "CP850" },

    { "ro",    "CP852" },

    { "ro_RO", "CP852" },

    { "ru",    "CP866" },

    { "ru_RU", "CP866" },

    { "sk",    "CP852" },

    { "sk_SK", "CP852" },

    { "sl",    "CP852" },

    { "sl_SI", "CP852" },

    { "sq",    "CP852" },

    { "sq_AL", "CP852" },

    { "sr",    "CP852" }, /* CP852 or CP866 or CP855 ?? */

    { "sr_CS", "CP852" }, /* CP852 or CP866 or CP855 ?? */

    { "sr_YU", "CP852" }, /* CP852 or CP866 or CP855 ?? */

    { "sv",    "CP850" },

    { "sv_SE", "CP850" },

    { "th",    "CP874" },

    { "th_TH", "CP874" },

    { "tr",    "CP857" },

    { "tr_TR", "CP857" },

    { "uk",    "CP1125" },

    { "uk_UA", "CP1125" },

    { "zh_CN", "GBK" },

    { "zh_TW", "CP950" } /* not CP938 ?? */

#  define locale_table_defined

# endif

# ifndef locale_table_defined

    /* Just a dummy entry, to avoid a C syntax error.  */

    { "", "" }

# endif

  };

#endif

/* Determine the current locale's character encoding, and canonicalize it

   into one of the canonical names listed in localcharset.h.

   The result must not be freed; it is statically allocated.

   If the canonical name cannot be determined, the result is a non-canonical

   name.  */

#ifdef STATIC

STATIC

#endif

const char *

locale_charset (void)

{

  const char *codeset;

#if HAVE_LANGINFO_CODESET || defined WINDOWS_NATIVE || defined OS2

# if HAVE_LANGINFO_CODESET

  /* Most systems support nl_langinfo (CODESET) nowadays.  */

  codeset = nl_langinfo (CODESET);

#  ifdef __CYGWIN__

  /* Cygwin < 1.7 does not have locales.  nl_langinfo (CODESET) always

     returns "US-ASCII".  Return the suffix of the locale name from the

     environment variables (if present) or the codepage as a number.  */

  if (codeset != NULL && strcmp (codeset, "US-ASCII") == 0)

    {

      const char *locale;

      static char buf[2 + 10 + 1];

      locale = getenv ("LC_ALL");

      if (locale == NULL || locale[0] == '\0')

        {

          locale = getenv ("LC_CTYPE");

          if (locale == NULL || locale[0] == '\0')

            locale = getenv ("LANG");

        }

      if (locale != NULL && locale[0] != '\0')

        {

          /* If the locale name contains an encoding after the dot, return

             it.  */

          const char *dot = strchr (locale, '.');

          if (dot != NULL)

            {

              const char *modifier;

              dot++;

              /* Look for the possible @... trailer and remove it, if any.  */

              modifier = strchr (dot, '@');

              if (modifier == NULL)

                return dot;

              if (modifier - dot < sizeof (buf))

                {

                  memcpy (buf, dot, modifier - dot);

                  buf [modifier - dot] = '\0';

                  return buf;

                }

            }

        }

      /* The Windows API has a function returning the locale's codepage as a

         number: GetACP().  This encoding is used by Cygwin, unless the user

         has set the environment variable CYGWIN=codepage:oem (which very few

         people do).

         Output directed to console windows needs to be converted (to

         GetOEMCP() if the console is using a raster font, or to

         GetConsoleOutputCP() if it is using a TrueType font).  Cygwin does

         this conversion transparently (see winsup/cygwin/fhandler_console.cc),

         converting to GetConsoleOutputCP().  This leads to correct results,

         except when SetConsoleOutputCP has been called and a raster font is

         in use.  */

      sprintf (buf, "CP%u", GetACP ());

      codeset = buf;

    }

#  endif

  if (codeset == NULL)

    /* The canonical name cannot be determined.  */

    codeset = "";

# elif defined WINDOWS_NATIVE

  static char buf[2 + 10 + 1];

  /* The Windows API has a function returning the locale's codepage as

     a number, but the value doesn't change according to what the

     'setlocale' call specified.  So we use it as a last resort, in

     case the string returned by 'setlocale' doesn't specify the

     codepage.  */

  char *current_locale = setlocale (LC_ALL, NULL);

  char *pdot;

  /* If they set different locales for different categories,

     'setlocale' will return a semi-colon separated list of locale

     values.  To make sure we use the correct one, we choose LC_CTYPE.  */

  if (strchr (current_locale, ';'))

    current_locale = setlocale (LC_CTYPE, NULL);

  pdot = strrchr (current_locale, '.');

  if (pdot && 2 + strlen (pdot + 1) + 1 <= sizeof (buf))

    sprintf (buf, "CP%s", pdot + 1);

  else

    {

      /* The Windows API has a function returning the locale's codepage as a

        number: GetACP().

        When the output goes to a console window, it needs to be provided in

        GetOEMCP() encoding if the console is using a raster font, or in

        GetConsoleOutputCP() encoding if it is using a TrueType font.

        But in GUI programs and for output sent to files and pipes, GetACP()

        encoding is the best bet.  */

      sprintf (buf, "CP%u", GetACP ());

    }

  codeset = buf;

# elif defined OS2

  const char *locale;

  static char buf[2 + 10 + 1];

  ULONG cp[3];

  ULONG cplen;

  codeset = NULL;

  /* Allow user to override the codeset, as set in the operating system,

     with standard language environment variables.  */

  locale = getenv ("LC_ALL");

  if (locale == NULL || locale[0] == '\0')

    {

      locale = getenv ("LC_CTYPE");

      if (locale == NULL || locale[0] == '\0')

        locale = getenv ("LANG");

    }

  if (locale != NULL && locale[0] != '\0')

    {

      /* If the locale name contains an encoding after the dot, return it.  */

      const char *dot = strchr (locale, '.');

      if (dot != NULL)

        {

          const char *modifier;

          dot++;

          /* Look for the possible @... trailer and remove it, if any.  */

          modifier = strchr (dot, '@');

          if (modifier == NULL)

            return dot;

          if (modifier - dot < sizeof (buf))

            {

              memcpy (buf, dot, modifier - dot);

              buf [modifier - dot] = '\0';

              return buf;

            }

        }

      /* For the POSIX locale, don't use the system's codepage.  */

      if (strcmp (locale, "C") == 0 || strcmp (locale, "POSIX") == 0)

        codeset = "";

    }

  if (codeset == NULL)

    {

      /* OS/2 has a function returning the locale's codepage as a number.  */

      if (DosQueryCp (sizeof (cp), cp, &cplen))

        codeset = "";

      else

        {

          sprintf (buf, "CP%u", cp[0]);

          codeset = buf;

        }

    }

# else

#  error "Add code for other platforms here."

# endif

  /* Resolve alias.  */

  {

# ifdef alias_table_defined

    /* On some platforms, UTF-8 locales are the most frequently used ones.

       Speed up the common case and slow down the less common cases by

       testing for this case first.  */

#  if defined __OpenBSD__ || (defined __APPLE__ && defined __MACH__) || defined __sun || defined __CYGWIN__

    if (strcmp (codeset, "UTF-8") == 0)

      goto done_table_lookup;

    else

#  endif

      {

        const struct table_entry * const table = alias_table;

        size_t const table_size =

          sizeof (alias_table) / sizeof (struct table_entry);

        /* The table is sorted.  Perform a binary search.  */

        size_t hi = table_size;

        size_t lo = 0;

        while (lo < hi)

          {

            /* Invariant:

               for i < lo, strcmp (table[i].alias, codeset) < 0,

               for i >= hi, strcmp (table[i].alias, codeset) > 0.  */

            size_t mid = (hi + lo) >> 1; /* >= lo, < hi */

            int cmp = strcmp (table[mid].alias, codeset);

            if (cmp < 0)