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// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006

// 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 <cstdlib>     // For getenv

#include <cctype>

#include <cwctype>     // For towupper, etc.

#include <locale>

#include <bits/atomicity.h>

#include <bits/concurrence.h>

namespace __gnu_internal

{

  // Mutex object for cache access

  static __glibcxx_mutex_define_initialized(locale_cache_mutex);

}

namespace std

{

  // Definitions for static const data members of locale.

  const locale::category        locale::none;

  const locale::category        locale::ctype;

  const locale::category        locale::numeric;

  const locale::category        locale::collate;

  const locale::category        locale::time;

  const locale::category        locale::monetary;

  const locale::category        locale::messages;

  const locale::category        locale::all;

  // These are no longer exported.

  locale::_Impl*                locale::_S_classic;

  locale::_Impl*                locale::_S_global;

#ifdef __GTHREADS

  __gthread_once_t              locale::_S_once = __GTHREAD_ONCE_INIT;

#endif

  locale::locale(const locale& __other) throw()

  : _M_impl(__other._M_impl)

  { _M_impl->_M_add_reference(); }

  // This is used to initialize global and classic locales, and

  // assumes that the _Impl objects are constructed correctly.

  // The lack of a reference increment is intentional.

  locale::locale(_Impl* __ip) throw() : _M_impl(__ip)

  { }

  locale::~locale() throw()

  { _M_impl->_M_remove_reference(); }

  bool

  locale::operator==(const locale& __rhs) const throw()

  {

    // Deal first with the common cases, fast to process: refcopies,

    // unnamed (i.e., !_M_names[0]), "simple" (!_M_names[1] => all the

    // categories same name, i.e., _M_names[0]). Otherwise fall back

    // to the general locale::name().

    bool __ret;

    if (_M_impl == __rhs._M_impl)

      __ret = true;

    else if (!_M_impl->_M_names[0] || !__rhs._M_impl->_M_names[0]

             || std::strcmp(_M_impl->_M_names[0],

                            __rhs._M_impl->_M_names[0]) != 0)

      __ret = false;

    else if (!_M_impl->_M_names[1] && !__rhs._M_impl->_M_names[1])

      __ret = true;

    else

      __ret = this->name() == __rhs.name();

    return __ret;

  }

  const locale&

  locale::operator=(const locale& __other) throw()

  {

    __other._M_impl->_M_add_reference();

    _M_impl->_M_remove_reference();

    _M_impl = __other._M_impl;

    return *this;

  }

  string

  locale::name() const

  {

    string __ret;

    if (!_M_impl->_M_names[0])

      __ret = '*';

    else if (_M_impl->_M_check_same_name())

      __ret = _M_impl->_M_names[0];

    else

      {

        __ret.reserve(128);

        __ret += _S_categories[0];

        __ret += '=';

        __ret += _M_impl->_M_names[0];

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

          {

            __ret += ';';

            __ret += _S_categories[__i];

            __ret += '=';

            __ret += _M_impl->_M_names[__i];

          }

      }

    return __ret;

  }

  locale::category

  locale::_S_normalize_category(category __cat)

  {

    int __ret = 0;

    if (__cat == none || (__cat & all) && !(__cat & ~all))

      __ret = __cat;

    else

      {

        // NB: May be a C-style "LC_ALL" category; convert.

        switch (__cat)

          {

          case LC_COLLATE:

            __ret = collate;

            break;

          case LC_CTYPE:

            __ret = ctype;

            break;

          case LC_MONETARY:

            __ret = monetary;

            break;

          case LC_NUMERIC:

            __ret = numeric;

            break;

          case LC_TIME:

            __ret = time;

            break;

#ifdef _GLIBCXX_HAVE_LC_MESSAGES

          case LC_MESSAGES:

            __ret = messages;

            break;

#endif  

          case LC_ALL:

            __ret = all;

            break;

          default:

            __throw_runtime_error(__N("locale::_S_normalize_category "

                                  "category not found"));

          }

      }

    return __ret;

  }

  // locale::facet

  __c_locale locale::facet::_S_c_locale;

  const char locale::facet::_S_c_name[2] = "C";

#ifdef __GTHREADS

  __gthread_once_t locale::facet::_S_once = __GTHREAD_ONCE_INIT;

#endif

  void

  locale::facet::_S_initialize_once()

  {

    // Initialize the underlying locale model.

    _S_create_c_locale(_S_c_locale, _S_c_name);

  }

  __c_locale

  locale::facet::_S_get_c_locale()

  {

#ifdef __GHTREADS

    if (__gthread_active_p())

      __gthread_once(&_S_once, _S_initialize_once);

    else

#endif

      {

        if (!_S_c_locale)

          _S_initialize_once();

      }

    return _S_c_locale;

  }

  const char*

  locale::facet::_S_get_c_name()

  { return _S_c_name; }

  locale::facet::

  ~facet() { }

  // locale::_Impl

  locale::_Impl::

  ~_Impl() throw()

  {

    if (_M_facets)

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

        if (_M_facets[__i])

          _M_facets[__i]->_M_remove_reference();

    delete [] _M_facets;

    if (_M_caches)

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

        if (_M_caches[__i])

          _M_caches[__i]->_M_remove_reference();

    delete [] _M_caches;

    if (_M_names)

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

        delete [] _M_names[__i];

    delete [] _M_names;

  }

  // Clone existing _Impl object.

  locale::_Impl::

  _Impl(const _Impl& __imp, size_t __refs)

  : _M_refcount(__refs), _M_facets(0), _M_facets_size(__imp._M_facets_size),

  _M_caches(0), _M_names(0)

  {

    try

      {

        _M_facets = new const facet*[_M_facets_size];

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

          {

            _M_facets[__i] = __imp._M_facets[__i];

            if (_M_facets[__i])

              _M_facets[__i]->_M_add_reference();

          }

        _M_caches = new const facet*[_M_facets_size];

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

          {

            _M_caches[__j] = __imp._M_caches[__j];

            if (_M_caches[__j])

              _M_caches[__j]->_M_add_reference();

          }

        _M_names = new char*[_S_categories_size];

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

          _M_names[__k] = 0;

        // Name the categories.

        for (size_t __l = 0; (__l < _S_categories_size

                              && __imp._M_names[__l]); ++__l)

          {

            const size_t __len = std::strlen(__imp._M_names[__l]) + 1;

            _M_names[__l] = new char[__len];

            std::memcpy(_M_names[__l], __imp._M_names[__l], __len);

          }

      }

    catch(...)

      {

        this->~_Impl();

        __throw_exception_again;

      }

  }

  void

  locale::_Impl::

  _M_replace_category(const _Impl* __imp,

                      const locale::id* const* __idpp)

  {

    for (; *__idpp; ++__idpp)

      _M_replace_facet(__imp, *__idpp);

  }

  void

  locale::_Impl::

  _M_replace_facet(const _Impl* __imp, const locale::id* __idp)

  {

    size_t __index = __idp->_M_id();

    if ((__index > (__imp->_M_facets_size - 1))

        || !__imp->_M_facets[__index])

      __throw_runtime_error(__N("locale::_Impl::_M_replace_facet"));

    _M_install_facet(__idp, __imp->_M_facets[__index]);

  }

  void

  locale::_Impl::

  _M_install_facet(const locale::id* __idp, const facet* __fp)

  {

    if (__fp)

      {

        size_t __index = __idp->_M_id();

        // Check size of facet vector to ensure adequate room.

        if (__index > _M_facets_size - 1)

          {

            const size_t __new_size = __index + 4;

            // New facet array.

            const facet** __oldf = _M_facets;

            const facet** __newf;

            __newf = new const facet*[__new_size];

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

              __newf[__i] = _M_facets[__i];

            for (size_t __l = _M_facets_size; __l < __new_size; ++__l)

              __newf[__l] = 0;

            // New cache array.

            const facet** __oldc = _M_caches;

            const facet** __newc;

            try

              {

                __newc = new const facet*[__new_size];

              }

            catch(...)

              {

                delete [] __newf;

                __throw_exception_again;

              }

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

              __newc[__j] = _M_caches[__j];

            for (size_t __k = _M_facets_size; __k < __new_size; ++__k)

              __newc[__k] = 0;

            _M_facets_size = __new_size;

            _M_facets = __newf;

            _M_caches = __newc;

            delete [] __oldf;

            delete [] __oldc;

          }

        __fp->_M_add_reference();

        const facet*& __fpr = _M_facets[__index];

        if (__fpr)

          {

            // Replacing an existing facet. Order matters.

            __fpr->_M_remove_reference();

            __fpr = __fp;

          }

        else

          {

            // Installing a newly created facet into an empty

            // _M_facets container, say a newly-constructed,

            // swanky-fresh _Impl.

            _M_facets[__index] = __fp;

          }

        // Ideally, it would be nice to only remove the caches that

        // are now incorrect. However, some of the caches depend on

        // multiple facets, and we only know about one facet

        // here. It's no great loss: the first use of the new facet

        // will create a new, correctly cached facet anyway.

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

          {

            const facet* __cpr = _M_caches[__i];

            if (__cpr)

              {

                __cpr->_M_remove_reference();

                _M_caches[__i] = 0;

              }

          }

      }

  }

  void

  locale::_Impl::

  _M_install_cache(const facet* __cache, size_t __index)

  {

    __gnu_cxx::lock sentry(__gnu_internal::locale_cache_mutex);

    if (_M_caches[__index] != 0)

      {

        // Some other thread got in first.

        delete __cache;

      }

    else

      {

        __cache->_M_add_reference();

        _M_caches[__index] = __cache;

      }

  }

  // locale::id

  // Definitions for static const data members of locale::id

  _Atomic_word locale::id::_S_refcount;  // init'd to 0 by linker

  size_t

  locale::id::_M_id() const

  {

    if (!_M_index)

      _M_index = 1 + __gnu_cxx::__exchange_and_add(&_S_refcount, 1);

    return _M_index - 1;

  }

} // namespace std