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

// 2009, 2010

// 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

#include <clocale>

#include <cstring>

#include <cstdlib>     // For getenv, free.

#include <cctype>

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

#include <locale>

#include <ext/concurrence.h>

namespace

{

  __gnu_cxx::__mutex&

  get_locale_mutex()

  {

    static __gnu_cxx::__mutex locale_mutex;

    return locale_mutex;

  }

  using namespace std;

  typedef char fake_locale_Impl[sizeof(locale::_Impl)]

  __attribute__ ((aligned(__alignof__(locale::_Impl))));

  fake_locale_Impl c_locale_impl;

  typedef char fake_locale[sizeof(locale)]

  __attribute__ ((aligned(__alignof__(locale))));

  fake_locale c_locale;

  typedef char fake_name_vec[sizeof(char*)]

  __attribute__ ((aligned(__alignof__(char*))));

  fake_name_vec name_vec[6 + _GLIBCXX_NUM_CATEGORIES];

  typedef char fake_names[sizeof(char[2])]

  __attribute__ ((aligned(__alignof__(char[2]))));

  fake_names name_c[6 + _GLIBCXX_NUM_CATEGORIES];

  typedef char fake_facet_vec[sizeof(locale::facet*)]

  __attribute__ ((aligned(__alignof__(locale::facet*))));

  fake_facet_vec facet_vec[_GLIBCXX_NUM_FACETS];

  typedef char fake_cache_vec[sizeof(locale::facet*)]

  __attribute__ ((aligned(__alignof__(locale::facet*))));

  fake_cache_vec cache_vec[_GLIBCXX_NUM_FACETS];

  typedef char fake_ctype_c[sizeof(std::ctype<char>)]

  __attribute__ ((aligned(__alignof__(std::ctype<char>))));

  fake_ctype_c ctype_c;

  typedef char fake_collate_c[sizeof(std::collate<char>)]

  __attribute__ ((aligned(__alignof__(std::collate<char>))));

  fake_collate_c collate_c;

  typedef char fake_numpunct_c[sizeof(numpunct<char>)]

  __attribute__ ((aligned(__alignof__(numpunct<char>))));

  fake_numpunct_c numpunct_c;

  typedef char fake_num_get_c[sizeof(num_get<char>)]

  __attribute__ ((aligned(__alignof__(num_get<char>))));

  fake_num_get_c num_get_c;

  typedef char fake_num_put_c[sizeof(num_put<char>)]

  __attribute__ ((aligned(__alignof__(num_put<char>))));

  fake_num_put_c num_put_c;

  typedef char fake_codecvt_c[sizeof(codecvt<char, char, mbstate_t>)]

  __attribute__ ((aligned(__alignof__(codecvt<char, char, mbstate_t>))));

  fake_codecvt_c codecvt_c;

  typedef char fake_moneypunct_c[sizeof(moneypunct<char, true>)]

  __attribute__ ((aligned(__alignof__(moneypunct<char, true>))));

  fake_moneypunct_c moneypunct_ct;

  fake_moneypunct_c moneypunct_cf;

  typedef char fake_money_get_c[sizeof(money_get<char>)]

  __attribute__ ((aligned(__alignof__(money_get<char>))));

  fake_money_get_c money_get_c;

  typedef char fake_money_put_c[sizeof(money_put<char>)]

  __attribute__ ((aligned(__alignof__(money_put<char>))));

  fake_money_put_c money_put_c;

  typedef char fake_timepunct_c[sizeof(__timepunct<char>)]

  __attribute__ ((aligned(__alignof__(__timepunct<char>))));

  fake_timepunct_c timepunct_c;

  typedef char fake_time_get_c[sizeof(time_get<char>)]

  __attribute__ ((aligned(__alignof__(time_get<char>))));

  fake_time_get_c time_get_c;

  typedef char fake_time_put_c[sizeof(time_put<char>)]

  __attribute__ ((aligned(__alignof__(time_put<char>))));

  fake_time_put_c time_put_c;

  typedef char fake_messages_c[sizeof(messages<char>)]

  __attribute__ ((aligned(__alignof__(messages<char>))));

  fake_messages_c messages_c;

#ifdef  _GLIBCXX_USE_WCHAR_T

  typedef char fake_wtype_w[sizeof(std::ctype<wchar_t>)]

  __attribute__ ((aligned(__alignof__(std::ctype<wchar_t>))));

  fake_wtype_w ctype_w;

  typedef char fake_wollate_w[sizeof(std::collate<wchar_t>)]

  __attribute__ ((aligned(__alignof__(std::collate<wchar_t>))));

  fake_wollate_w collate_w;

  typedef char fake_numpunct_w[sizeof(numpunct<wchar_t>)]

  __attribute__ ((aligned(__alignof__(numpunct<wchar_t>))));

  fake_numpunct_w numpunct_w;

  typedef char fake_num_get_w[sizeof(num_get<wchar_t>)]

  __attribute__ ((aligned(__alignof__(num_get<wchar_t>))));

  fake_num_get_w num_get_w;

  typedef char fake_num_put_w[sizeof(num_put<wchar_t>)]

  __attribute__ ((aligned(__alignof__(num_put<wchar_t>))));

  fake_num_put_w num_put_w;

  typedef char fake_wodecvt_w[sizeof(codecvt<wchar_t, char, mbstate_t>)]

  __attribute__ ((aligned(__alignof__(codecvt<wchar_t, char, mbstate_t>))));

  fake_wodecvt_w codecvt_w;

  typedef char fake_moneypunct_w[sizeof(moneypunct<wchar_t, true>)]

  __attribute__ ((aligned(__alignof__(moneypunct<wchar_t, true>))));

  fake_moneypunct_w moneypunct_wt;

  fake_moneypunct_w moneypunct_wf;

  typedef char fake_money_get_w[sizeof(money_get<wchar_t>)]

  __attribute__ ((aligned(__alignof__(money_get<wchar_t>))));

  fake_money_get_w money_get_w;

  typedef char fake_money_put_w[sizeof(money_put<wchar_t>)]

  __attribute__ ((aligned(__alignof__(money_put<wchar_t>))));

  fake_money_put_w money_put_w;

  typedef char fake_timepunct_w[sizeof(__timepunct<wchar_t>)]

  __attribute__ ((aligned(__alignof__(__timepunct<wchar_t>))));

  fake_timepunct_w timepunct_w;

  typedef char fake_time_get_w[sizeof(time_get<wchar_t>)]

  __attribute__ ((aligned(__alignof__(time_get<wchar_t>))));

  fake_time_get_w time_get_w;

  typedef char fake_time_put_w[sizeof(time_put<wchar_t>)]

  __attribute__ ((aligned(__alignof__(time_put<wchar_t>))));

  fake_time_put_w time_put_w;

  typedef char fake_messages_w[sizeof(messages<wchar_t>)]

  __attribute__ ((aligned(__alignof__(messages<wchar_t>))));

  fake_messages_w messages_w;

#endif

  // Storage for "C" locale caches.

  typedef char fake_num_cache_c[sizeof(std::__numpunct_cache<char>)]

  __attribute__ ((aligned(__alignof__(std::__numpunct_cache<char>))));

  fake_num_cache_c numpunct_cache_c;

  typedef char fake_money_cache_c[sizeof(std::__moneypunct_cache<char, true>)]

  __attribute__ ((aligned(__alignof__(std::__moneypunct_cache<char, true>))));

  fake_money_cache_c moneypunct_cache_ct;

  fake_money_cache_c moneypunct_cache_cf;

  typedef char fake_time_cache_c[sizeof(std::__timepunct_cache<char>)]

  __attribute__ ((aligned(__alignof__(std::__timepunct_cache<char>))));

  fake_time_cache_c timepunct_cache_c;

#ifdef _GLIBCXX_USE_WCHAR_T

  typedef char fake_num_cache_w[sizeof(std::__numpunct_cache<wchar_t>)]

  __attribute__ ((aligned(__alignof__(std::__numpunct_cache<wchar_t>))));

  fake_num_cache_w numpunct_cache_w;

  typedef char fake_money_cache_w[sizeof(std::__moneypunct_cache<wchar_t,true>)]

  __attribute__ ((aligned(__alignof__(std::__moneypunct_cache<wchar_t,true>))));

  fake_money_cache_w moneypunct_cache_wt;

  fake_money_cache_w moneypunct_cache_wf;

  typedef char fake_time_cache_w[sizeof(std::__timepunct_cache<wchar_t>)]

  __attribute__ ((aligned(__alignof__(std::__timepunct_cache<wchar_t>))));

  fake_time_cache_w timepunct_cache_w;

#endif

} // anonymous namespace

namespace std _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  locale::locale() throw() : _M_impl(0)

  {

    _S_initialize();

    // Checked locking to optimize the common case where _S_global

    // still points to _S_classic (locale::_S_initialize_once()):

    // - If they are the same, just increment the reference count and

    //   we are done.  This effectively constructs a C locale object

    //   identical to the static c_locale.

    // - Otherwise, _S_global can and may be destroyed due to

    //   locale::global() call on another thread, in which case we

    //   fall back to lock protected access to both _S_global and

    //   its reference count.

    _M_impl = _S_global;

    if (_M_impl == _S_classic)

      _M_impl->_M_add_reference();

    else

      {

        __gnu_cxx::__scoped_lock sentry(get_locale_mutex());

        _S_global->_M_add_reference();

        _M_impl = _S_global;

      }

  }

  locale

  locale::global(const locale& __other)

  {

    _S_initialize();

    _Impl* __old;

    {

      __gnu_cxx::__scoped_lock sentry(get_locale_mutex());

      __old = _S_global;

      __other._M_impl->_M_add_reference();

      _S_global = __other._M_impl;

      const string __other_name = __other.name();

      if (__other_name != "*")

        setlocale(LC_ALL, __other_name.c_str());

    }

    // Reference count sanity check: one reference removed for the

    // subsition of __other locale, one added by return-by-value. Net

    // difference: zero. When the returned locale object's destrutor

    // is called, then the reference count is decremented and possibly

    // destroyed.

    return locale(__old);

  }

  const locale&

  locale::classic()

  {

    _S_initialize();

    return *(new (&c_locale) locale(_S_classic));

  }

  void

  locale::_S_initialize_once() throw()

  {

    // 2 references.

    // One reference for _S_classic, one for _S_global

    _S_classic = new (&c_locale_impl) _Impl(2);

    _S_global = _S_classic;

  }

  void

  locale::_S_initialize()

  {

#ifdef __GTHREADS

    if (__gthread_active_p())

      __gthread_once(&_S_once, _S_initialize_once);

#endif

    if (!_S_classic)

      _S_initialize_once();

  }

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

  const locale::id* const

  locale::_Impl::_S_id_ctype[] =

  {

    &std::ctype<char>::id,

    &codecvt<char, char, mbstate_t>::id,

#ifdef _GLIBCXX_USE_WCHAR_T

    &std::ctype<wchar_t>::id,

    &codecvt<wchar_t, char, mbstate_t>::id,

#endif

  };

  const locale::id* const

  locale::_Impl::_S_id_numeric[] =

  {

    &num_get<char>::id,

    &num_put<char>::id,

    &numpunct<char>::id,

#ifdef _GLIBCXX_USE_WCHAR_T

    &num_get<wchar_t>::id,

    &num_put<wchar_t>::id,

    &numpunct<wchar_t>::id,

#endif

  };

  const locale::id* const

  locale::_Impl::_S_id_collate[] =

  {

    &std::collate<char>::id,

#ifdef _GLIBCXX_USE_WCHAR_T

    &std::collate<wchar_t>::id,

#endif

  };

  const locale::id* const

  locale::_Impl::_S_id_time[] =

  {

    &__timepunct<char>::id,

    &time_get<char>::id,

    &time_put<char>::id,

#ifdef _GLIBCXX_USE_WCHAR_T

    &__timepunct<wchar_t>::id,

    &time_get<wchar_t>::id,

    &time_put<wchar_t>::id,

#endif

  };

  const locale::id* const

  locale::_Impl::_S_id_monetary[] =

  {

    &money_get<char>::id,

    &money_put<char>::id,

    &moneypunct<char, false>::id,

    &moneypunct<char, true >::id,

#ifdef _GLIBCXX_USE_WCHAR_T

    &money_get<wchar_t>::id,

    &money_put<wchar_t>::id,

    &moneypunct<wchar_t, false>::id,

    &moneypunct<wchar_t, true >::id,

#endif

  };

  const locale::id* const

  locale::_Impl::_S_id_messages[] =

  {

    &std::messages<char>::id,

#ifdef _GLIBCXX_USE_WCHAR_T

    &std::messages<wchar_t>::id,

#endif

  };

  const locale::id* const* const

  locale::_Impl::_S_facet_categories[] =

  {

    // Order must match the decl order in class locale.

    locale::_Impl::_S_id_ctype,

    locale::_Impl::_S_id_numeric,

    locale::_Impl::_S_id_collate,

    locale::_Impl::_S_id_time,

    locale::_Impl::_S_id_monetary,

    locale::_Impl::_S_id_messages,

  };

  // Construct "C" _Impl.

  locale::_Impl::

  _Impl(size_t __refs) throw()

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

  _M_caches(0), _M_names(0)

  {

    _M_facets = new (&facet_vec) const facet*[_M_facets_size];

    _M_caches = new (&cache_vec) const facet*[_M_facets_size];

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

      _M_facets[__i] = _M_caches[__i] = 0;

    // Name the categories.

    _M_names = new (&name_vec) char*[_S_categories_size];

    _M_names[0] = new (&name_c[0]) char[2];

    std::memcpy(_M_names[0], locale::facet::_S_get_c_name(), 2);

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

      _M_names[__j] = 0;

    // This is needed as presently the C++ version of "C" locales

    // != data in the underlying locale model for __timepunct,

    // numpunct, and moneypunct. Also, the "C" locales must be

    // constructed in a way such that they are pre-allocated.

    // NB: Set locale::facets(ref) count to one so that each individual

    // facet is not destroyed when the locale (and thus locale::_Impl) is

    // destroyed.

    _M_init_facet(new (&ctype_c) std::ctype<char>(0, false, 1));

    _M_init_facet(new (&codecvt_c) codecvt<char, char, mbstate_t>(1));

    typedef __numpunct_cache<char> num_cache_c;

    num_cache_c* __npc = new (&numpunct_cache_c) num_cache_c(2);

    _M_init_facet(new (&numpunct_c) numpunct<char>(__npc, 1));

    _M_init_facet(new (&num_get_c) num_get<char>(1));

    _M_init_facet(new (&num_put_c) num_put<char>(1));

    _M_init_facet(new (&collate_c) std::collate<char>(1));

    typedef __moneypunct_cache<char, false> money_cache_cf;

    typedef __moneypunct_cache<char, true> money_cache_ct;

    money_cache_cf* __mpcf = new (&moneypunct_cache_cf) money_cache_cf(2);

    _M_init_facet(new (&moneypunct_cf) moneypunct<char, false>(__mpcf, 1));

    money_cache_ct* __mpct = new (&moneypunct_cache_ct) money_cache_ct(2);

    _M_init_facet(new (&moneypunct_ct) moneypunct<char, true>(__mpct, 1));

    _M_init_facet(new (&money_get_c) money_get<char>(1));

    _M_init_facet(new (&money_put_c) money_put<char>(1));

    typedef __timepunct_cache<char> time_cache_c;

    time_cache_c* __tpc = new (&timepunct_cache_c) time_cache_c(2);

    _M_init_facet(new (&timepunct_c) __timepunct<char>(__tpc, 1));

    _M_init_facet(new (&time_get_c) time_get<char>(1));

    _M_init_facet(new (&time_put_c) time_put<char>(1));

    _M_init_facet(new (&messages_c) std::messages<char>(1));

#ifdef  _GLIBCXX_USE_WCHAR_T

    _M_init_facet(new (&ctype_w) std::ctype<wchar_t>(1));

    _M_init_facet(new (&codecvt_w) codecvt<wchar_t, char, mbstate_t>(1));

    typedef __numpunct_cache<wchar_t> num_cache_w;

    num_cache_w* __npw = new (&numpunct_cache_w) num_cache_w(2);

    _M_init_facet(new (&numpunct_w) numpunct<wchar_t>(__npw, 1));

    _M_init_facet(new (&num_get_w) num_get<wchar_t>(1));

    _M_init_facet(new (&num_put_w) num_put<wchar_t>(1));

    _M_init_facet(new (&collate_w) std::collate<wchar_t>(1));

    typedef __moneypunct_cache<wchar_t, false> money_cache_wf;

    typedef __moneypunct_cache<wchar_t, true> money_cache_wt;

    money_cache_wf* __mpwf = new (&moneypunct_cache_wf) money_cache_wf(2);

    _M_init_facet(new (&moneypunct_wf) moneypunct<wchar_t, false>(__mpwf, 1));

    money_cache_wt* __mpwt = new (&moneypunct_cache_wt) money_cache_wt(2);

    _M_init_facet(new (&moneypunct_wt) moneypunct<wchar_t, true>(__mpwt, 1));

    _M_init_facet(new (&money_get_w) money_get<wchar_t>(1));

    _M_init_facet(new (&money_put_w) money_put<wchar_t>(1));

    typedef __timepunct_cache<wchar_t> time_cache_w;

    time_cache_w* __tpw = new (&timepunct_cache_w) time_cache_w(2);

    _M_init_facet(new (&timepunct_w) __timepunct<wchar_t>(__tpw, 1));

    _M_init_facet(new (&time_get_w) time_get<wchar_t>(1));

    _M_init_facet(new (&time_put_w) time_put<wchar_t>(1));

    _M_init_facet(new (&messages_w) std::messages<wchar_t>(1));

#endif 

    // This locale is safe to pre-cache, after all the facets have

    // been created and installed.

    _M_caches[numpunct<char>::id._M_id()] = __npc;

    _M_caches[moneypunct<char, false>::id._M_id()] = __mpcf;

    _M_caches[moneypunct<char, true>::id._M_id()] = __mpct;

    _M_caches[__timepunct<char>::id._M_id()] = __tpc;

#ifdef  _GLIBCXX_USE_WCHAR_T

    _M_caches[numpunct<wchar_t>::id._M_id()] = __npw;

    _M_caches[moneypunct<wchar_t, false>::id._M_id()] = __mpwf;

    _M_caches[moneypunct<wchar_t, true>::id._M_id()] = __mpwt;

    _M_caches[__timepunct<wchar_t>::id._M_id()] = __tpw;

#endif

  }

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace