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// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004

// Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library 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 2, or (at your option)

// any later version.

// This library 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 library; see the file COPYING.  If not, write to the Free

// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,

// USA.

// As a special exception, you may use this file as part of a free software

// library without restriction.  Specifically, if other files instantiate

// templates or use macros or inline functions from this file, or you compile

// this file and link it with other files to produce an executable, this

// file does not by itself cause the resulting executable to be covered by

// the GNU General Public License.  This exception does not however

// invalidate any other reasons why the executable file might be covered by

// the GNU General Public License.

#include <clocale>

#include <cstring>

#include <locale>

namespace std

{

  using namespace __gnu_cxx;

  locale::locale(const char* __s) : _M_impl(0)

  {

    if (__s)

      {

        _S_initialize();

        if (std::strcmp(__s, "C") == 0 || std::strcmp(__s, "POSIX") == 0)

          (_M_impl = _S_classic)->_M_add_reference();

        else if (std::strcmp(__s, "") != 0)

          _M_impl = new _Impl(__s, 1);

        else

          {

            // Get it from the environment.

            char* __env = std::getenv("LC_ALL");

            // If LC_ALL is set we are done.

            if (__env && std::strcmp(__env, "") != 0)

              {

                if (std::strcmp(__env, "C") == 0

                    || std::strcmp(__env, "POSIX") == 0)

                  (_M_impl = _S_classic)->_M_add_reference();

                else

                  _M_impl = new _Impl(__env, 1);

              }

            else

              {

                // LANG may set a default different from "C".

                string __lang;

                __env = std::getenv("LANG");

                if (!__env || std::strcmp(__env, "") == 0

                    || std::strcmp(__env, "C") == 0

                    || std::strcmp(__env, "POSIX") == 0)

                  __lang = "C";

                else

                  __lang = __env;

                // Scan the categories looking for the first one

                // different from LANG.

                size_t __i = 0;

                if (__lang == "C")

                  for (; __i < _S_categories_size; ++__i)

                    {

                      __env = std::getenv(_S_categories[__i]);

                      if (__env && std::strcmp(__env, "") != 0

                          && std::strcmp(__env, "C") != 0

                          && std::strcmp(__env, "POSIX") != 0)

                        break;

                    }

                else

                  for (; __i < _S_categories_size; ++__i)

                    {

                      __env = std::getenv(_S_categories[__i]);

                      if (__env && std::strcmp(__env, "") != 0

                          && __lang != __env)

                        break;

                    }

                // If one is found, build the complete string of

                // the form LC_CTYPE=xxx;LC_NUMERIC=yyy; and so on...

                if (__i < _S_categories_size)

                  {

                    string __str;

                    __str.reserve(128);

                    for (size_t __j = 0; __j < __i; ++__j)

                      {

                        __str += _S_categories[__j];

                        __str += '=';

                        __str += __lang;

                        __str += ';';

                      }

                    __str += _S_categories[__i];

                    __str += '=';

                    __str += __env;

                    __str += ';';

                    ++__i;

                    for (; __i < _S_categories_size; ++__i)

                      {

                        __env = std::getenv(_S_categories[__i]);

                        __str += _S_categories[__i];

                        if (!__env || std::strcmp(__env, "") == 0)

                          {

                            __str += '=';

                            __str += __lang;

                            __str += ';';

                          }

                        else if (std::strcmp(__env, "C") == 0

                                 || std::strcmp(__env, "POSIX") == 0)

                          __str += "=C;";

                        else

                          {

                            __str += '=';

                            __str += __env;

                            __str += ';';

                          }

                      }

                    __str.erase(__str.end() - 1);

                    _M_impl = new _Impl(__str.c_str(), 1);

                  }

                // ... otherwise either an additional instance of

                // the "C" locale or LANG.

                else if (__lang == "C")

                  (_M_impl = _S_classic)->_M_add_reference();

                else

                  _M_impl = new _Impl(__lang.c_str(), 1);

              }

          }

      }

    else

      __throw_runtime_error(__N("locale::locale NULL not valid"));

  }

  locale::locale(const locale& __base, const char* __s, category __cat)

  : _M_impl(0)

  {

    // NB: There are complicated, yet more efficient ways to do

    // this. Building up locales on a per-category way is tedious, so

    // let's do it this way until people complain.

    locale __add(__s);

    _M_coalesce(__base, __add, __cat);

  }

  locale::locale(const locale& __base, const locale& __add, category __cat)

  : _M_impl(0)

  { _M_coalesce(__base, __add, __cat); }

  void

  locale::_M_coalesce(const locale& __base, const locale& __add,

                      category __cat)

  {

    __cat = _S_normalize_category(__cat);

    _M_impl = new _Impl(*__base._M_impl, 1);

    try

      { _M_impl->_M_replace_categories(__add._M_impl, __cat); }

    catch (...)

      {

        _M_impl->_M_remove_reference();

        __throw_exception_again;

      }

  }

  // Construct named _Impl.

  locale::_Impl::

  _Impl(const char* __s, size_t __refs)

  : _M_refcount(__refs), _M_facets(0), _M_facets_size(_GLIBCXX_NUM_FACETS),

    _M_caches(0), _M_names(0)

  {

    // Initialize the underlying locale model, which also checks to

    // see if the given name is valid.

    __c_locale __cloc;

    locale::facet::_S_create_c_locale(__cloc, __s);

    try

      {

        _M_facets = new const facet*[_M_facets_size];

        for (size_t __i = 0; __i < _M_facets_size; ++__i)

          _M_facets[__i] = 0;

        _M_caches = new const facet*[_M_facets_size];

        for (size_t __j = 0; __j < _M_facets_size; ++__j)

          _M_caches[__j] = 0;

        _M_names = new char*[_S_categories_size];

        for (size_t __k = 0; __k < _S_categories_size; ++__k)

          _M_names[__k] = 0;

        // Name the categories.

        const size_t __len = std::strlen(__s);

        if (!std::memchr(__s, ';', __len))

          {

            _M_names[0] = new char[__len + 1];

            std::memcpy(_M_names[0], __s, __len + 1);

          }

        else

          {

            const char* __end = __s;

            for (size_t __i = 0; __i < _S_categories_size; ++__i)

              {

                const char* __beg = std::strchr(__end + 1, '=') + 1;

                __end = std::strchr(__beg, ';');

                if (!__end)

                  __end = __s + __len;

                _M_names[__i] = new char[__end - __beg + 1];

                std::memcpy(_M_names[__i], __beg, __end - __beg);

                _M_names[__i][__end - __beg] = '\0';

              }

          }

        // Construct all standard facets and add them to _M_facets.

        _M_init_facet(new std::ctype<char>(__cloc, 0, false));

        _M_init_facet(new codecvt<char, char, mbstate_t>(__cloc));

        _M_init_facet(new numpunct<char>(__cloc));

        _M_init_facet(new num_get<char>);

        _M_init_facet(new num_put<char>);

        _M_init_facet(new std::collate<char>(__cloc));

        _M_init_facet(new moneypunct<char, false>(__cloc, __s));

        _M_init_facet(new moneypunct<char, true>(__cloc, __s));

        _M_init_facet(new money_get<char>);

        _M_init_facet(new money_put<char>);

        _M_init_facet(new __timepunct<char>(__cloc, __s));

        _M_init_facet(new time_get<char>);

        _M_init_facet(new time_put<char>);

        _M_init_facet(new std::messages<char>(__cloc, __s));

#ifdef  _GLIBCXX_USE_WCHAR_T

        _M_init_facet(new std::ctype<wchar_t>(__cloc));

        _M_init_facet(new codecvt<wchar_t, char, mbstate_t>(__cloc));

        _M_init_facet(new numpunct<wchar_t>(__cloc));

        _M_init_facet(new num_get<wchar_t>);

        _M_init_facet(new num_put<wchar_t>);

        _M_init_facet(new std::collate<wchar_t>(__cloc));

        _M_init_facet(new moneypunct<wchar_t, false>(__cloc, __s));

        _M_init_facet(new moneypunct<wchar_t, true>(__cloc, __s));

        _M_init_facet(new money_get<wchar_t>);

        _M_init_facet(new money_put<wchar_t>);

        _M_init_facet(new __timepunct<wchar_t>(__cloc, __s));

        _M_init_facet(new time_get<wchar_t>);

        _M_init_facet(new time_put<wchar_t>);

        _M_init_facet(new std::messages<wchar_t>(__cloc, __s));

#endif    

        locale::facet::_S_destroy_c_locale(__cloc);

      }

    catch(...)

      {

        locale::facet::_S_destroy_c_locale(__cloc);

        this->~_Impl();

        __throw_exception_again;

      }

  }

  void

  locale::_Impl::

  _M_replace_categories(const _Impl* __imp, category __cat)

  {

    category __mask = 1;

    const bool __have_names = _M_names[0] && __imp->_M_names[0];

    for (size_t __ix = 0; __ix < _S_categories_size; ++__ix, __mask <<= 1)

      {

        if (__mask & __cat)

          {

            // Need to replace entry in _M_facets with other locale's info.

            _M_replace_category(__imp, _S_facet_categories[__ix]);

            // If both have names, go ahead and mangle.

            if (__have_names)

              {

                if (!_M_names[1])

                  {

                    // A full set of _M_names must be prepared, all identical

                    // to _M_names[0] to begin with. Then, below, a few will

                    // be replaced by the corresponding __imp->_M_names. I.e.,

                    // not a "simple" locale anymore (see locale::operator==).

                    const size_t __len = std::strlen(_M_names[0]) + 1;

                    for (size_t __i = 1; __i < _S_categories_size; ++__i)

                      {

                        _M_names[__i] = new char[__len];

                        std::memcpy(_M_names[__i], _M_names[0], __len);

                      }

                  }

                char* __src = __imp->_M_names[__ix] ? __imp->_M_names[__ix]

                                                    : __imp->_M_names[0];

                const size_t __len = std::strlen(__src) + 1;

                char* __new = new char[__len];

                std::memcpy(__new, __src, __len);

                delete [] _M_names[__ix];

                _M_names[__ix] = __new;

              }

          }

      }

  }

} // namespace std