mipsel-linux-uclibc/include/c++/4.5.3/ext/codecvt_specializations.h - toolchains/bruno - Git at Google

 // Locale support (codecvt) -*- C++ -*-

 // Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009
 //  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/>.

 //
 // ISO C++ 14882: 22.2.1.5 Template class codecvt
 //

 // Written by Benjamin Kosnik <bkoz@redhat.com>

 /** @file ext/codecvt_specializations.h
  *  This file is a GNU extension to the Standard C++ Library.
  */

 #ifndef _EXT_CODECVT_SPECIALIZATIONS_H
 #define _EXT_CODECVT_SPECIALIZATIONS_H 1

 #include <bits/c++config.h>
 #include <locale>
 #include <iconv.h>

 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

   /// Extension to use iconv for dealing with character encodings.
   // This includes conversions and comparisons between various character
   // sets.  This object encapsulates data that may need to be shared between
   // char_traits, codecvt and ctype.
   class encoding_state
   {
   public:
     // Types:
     // NB: A conversion descriptor subsumes and enhances the
     // functionality of a simple state type such as mbstate_t.
     typedef iconv_t	descriptor_type;

   protected:
     // Name of internal character set encoding.
     std::string	       	_M_int_enc;

     // Name of external character set encoding.
     std::string  	_M_ext_enc;

     // Conversion descriptor between external encoding to internal encoding.
     descriptor_type	_M_in_desc;

     // Conversion descriptor between internal encoding to external encoding.
     descriptor_type	_M_out_desc;

     // The byte-order marker for the external encoding, if necessary.
     int			_M_ext_bom;

     // The byte-order marker for the internal encoding, if necessary.
     int			_M_int_bom;

     // Number of external bytes needed to construct one complete
     // character in the internal encoding.
     // NB: -1 indicates variable, or stateful, encodings.
     int 		_M_bytes;

   public:
     explicit
     encoding_state()
     : _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0), _M_bytes(0)
     { }

     explicit
     encoding_state(const char* __int, const char* __ext,
 		   int __ibom = 0, int __ebom = 0, int __bytes = 1)
     : _M_int_enc(__int), _M_ext_enc(__ext), _M_in_desc(0), _M_out_desc(0),
       _M_ext_bom(__ebom), _M_int_bom(__ibom), _M_bytes(__bytes)
     { init(); }

     // 21.1.2 traits typedefs
     // p4
     // typedef STATE_T state_type
     // requires: state_type shall meet the requirements of
     // CopyConstructible types (20.1.3)
     // NB: This does not preserve the actual state of the conversion
     // descriptor member, but it does duplicate the encoding
     // information.
     encoding_state(const encoding_state& __obj) : _M_in_desc(0), _M_out_desc(0)
     { construct(__obj); }

     // Need assignment operator as well.
     encoding_state&
     operator=(const encoding_state& __obj)
     {
       construct(__obj);
       return *this;
     }

     ~encoding_state()
     { destroy(); }

     bool
     good() const throw()
     {
       const descriptor_type __err = (iconv_t)(-1);
       bool __test = _M_in_desc && _M_in_desc != __err;
       __test &=  _M_out_desc && _M_out_desc != __err;
       return __test;
     }

     int
     character_ratio() const
     { return _M_bytes; }

     const std::string
     internal_encoding() const
     { return _M_int_enc; }

     int
     internal_bom() const
     { return _M_int_bom; }

     const std::string
     external_encoding() const
     { return _M_ext_enc; }

     int
     external_bom() const
     { return _M_ext_bom; }

     const descriptor_type&
     in_descriptor() const
     { return _M_in_desc; }

     const descriptor_type&
     out_descriptor() const
     { return _M_out_desc; }

   protected:
     void
     init()
     {
       const descriptor_type __err = (iconv_t)(-1);
       const bool __have_encodings = _M_int_enc.size() && _M_ext_enc.size();
       if (!_M_in_desc && __have_encodings)
 	{
 	  _M_in_desc = iconv_open(_M_int_enc.c_str(), _M_ext_enc.c_str());
 	  if (_M_in_desc == __err)
 	    std::__throw_runtime_error(__N("encoding_state::_M_init "
 				    "creating iconv input descriptor failed"));
 	}
       if (!_M_out_desc && __have_encodings)
 	{
 	  _M_out_desc = iconv_open(_M_ext_enc.c_str(), _M_int_enc.c_str());
 	  if (_M_out_desc == __err)
 	    std::__throw_runtime_error(__N("encoding_state::_M_init "
 				  "creating iconv output descriptor failed"));
 	}
     }

     void
     construct(const encoding_state& __obj)
     {
       destroy();
       _M_int_enc = __obj._M_int_enc;
       _M_ext_enc = __obj._M_ext_enc;
       _M_ext_bom = __obj._M_ext_bom;
       _M_int_bom = __obj._M_int_bom;
       _M_bytes = __obj._M_bytes;
       init();
     }

     void
     destroy() throw()
     {
       const descriptor_type __err = (iconv_t)(-1);
       if (_M_in_desc && _M_in_desc != __err)
 	{
 	  iconv_close(_M_in_desc);
 	  _M_in_desc = 0;
 	}
       if (_M_out_desc && _M_out_desc != __err)
 	{
 	  iconv_close(_M_out_desc);
 	  _M_out_desc = 0;
 	}
     }
   };

   /// encoding_char_traits
   // Custom traits type with encoding_state for the state type, and the
   // associated fpos<encoding_state> for the position type, all other
   // bits equivalent to the required char_traits instantiations.
   template<typename _CharT>
     struct encoding_char_traits : public std::char_traits<_CharT>
     {
       typedef encoding_state				state_type;
       typedef typename std::fpos<state_type>		pos_type;
     };

 _GLIBCXX_END_NAMESPACE


 _GLIBCXX_BEGIN_NAMESPACE(std)

   using __gnu_cxx::encoding_state;

   /// codecvt<InternT, _ExternT, encoding_state> specialization.
   // This partial specialization takes advantage of iconv to provide
   // code conversions between a large number of character encodings.
   template<typename _InternT, typename _ExternT>
     class codecvt<_InternT, _ExternT, encoding_state>
     : public __codecvt_abstract_base<_InternT, _ExternT, encoding_state>
     {
     public:
       // Types:
       typedef codecvt_base::result			result;
       typedef _InternT 					intern_type;
       typedef _ExternT 					extern_type;
       typedef __gnu_cxx::encoding_state 		state_type;
       typedef state_type::descriptor_type 		descriptor_type;

       // Data Members:
       static locale::id 		id;

       explicit
       codecvt(size_t __refs = 0)
       : __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
       { }

       explicit
       codecvt(state_type& __enc, size_t __refs = 0)
       : __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
       { }

      protected:
       virtual
       ~codecvt() { }

       virtual result
       do_out(state_type& __state, const intern_type* __from,
 	     const intern_type* __from_end, const intern_type*& __from_next,
 	     extern_type* __to, extern_type* __to_end,
 	     extern_type*& __to_next) const;

       virtual result
       do_unshift(state_type& __state, extern_type* __to,
 		 extern_type* __to_end, extern_type*& __to_next) const;

       virtual result
       do_in(state_type& __state, const extern_type* __from,
 	    const extern_type* __from_end, const extern_type*& __from_next,
 	    intern_type* __to, intern_type* __to_end,
 	    intern_type*& __to_next) const;

       virtual int
       do_encoding() const throw();

       virtual bool
       do_always_noconv() const throw();

       virtual int
       do_length(state_type&, const extern_type* __from,
 		const extern_type* __end, size_t __max) const;

       virtual int
       do_max_length() const throw();
     };

   template<typename _InternT, typename _ExternT>
     locale::id
     codecvt<_InternT, _ExternT, encoding_state>::id;

   // This adaptor works around the signature problems of the second
   // argument to iconv():  SUSv2 and others use 'const char**', but glibc 2.2
   // uses 'char**', which matches the POSIX 1003.1-2001 standard.
   // Using this adaptor, g++ will do the work for us.
   template<typename _Tp>
     inline size_t
     __iconv_adaptor(size_t(*__func)(iconv_t, _Tp, size_t*, char**, size_t*),
                     iconv_t __cd, char** __inbuf, size_t* __inbytes,
                     char** __outbuf, size_t* __outbytes)
     { return __func(__cd, (_Tp)__inbuf, __inbytes, __outbuf, __outbytes); }

   template<typename _InternT, typename _ExternT>
     codecvt_base::result
     codecvt<_InternT, _ExternT, encoding_state>::
     do_out(state_type& __state, const intern_type* __from,
 	   const intern_type* __from_end, const intern_type*& __from_next,
 	   extern_type* __to, extern_type* __to_end,
 	   extern_type*& __to_next) const
     {
       result __ret = codecvt_base::error;
       if (__state.good())
 	{
 	  const descriptor_type& __desc = __state.out_descriptor();
 	  const size_t __fmultiple = sizeof(intern_type);
 	  size_t __fbytes = __fmultiple * (__from_end - __from);
 	  const size_t __tmultiple = sizeof(extern_type);
 	  size_t __tbytes = __tmultiple * (__to_end - __to);

 	  // Argument list for iconv specifies a byte sequence. Thus,
 	  // all to/from arrays must be brutally casted to char*.
 	  char* __cto = reinterpret_cast<char*>(__to);
 	  char* __cfrom;
 	  size_t __conv;

 	  // Some encodings need a byte order marker as the first item
 	  // in the byte stream, to designate endian-ness. The default
 	  // value for the byte order marker is NULL, so if this is
 	  // the case, it's not necessary and we can just go on our
 	  // merry way.
 	  int __int_bom = __state.internal_bom();
 	  if (__int_bom)
 	    {
 	      size_t __size = __from_end - __from;
 	      intern_type* __cfixed = static_cast<intern_type*>
 		(__builtin_alloca(sizeof(intern_type) * (__size + 1)));
 	      __cfixed[0] = static_cast<intern_type>(__int_bom);
 	      char_traits<intern_type>::copy(__cfixed + 1, __from, __size);
 	      __cfrom = reinterpret_cast<char*>(__cfixed);
 	      __conv = __iconv_adaptor(iconv, __desc, &__cfrom,
                                         &__fbytes, &__cto, &__tbytes);
 	    }
 	  else
 	    {
 	      intern_type* __cfixed = const_cast<intern_type*>(__from);
 	      __cfrom = reinterpret_cast<char*>(__cfixed);
 	      __conv = __iconv_adaptor(iconv, __desc, &__cfrom, &__fbytes,
 				       &__cto, &__tbytes);
 	    }

 	  if (__conv != size_t(-1))
 	    {
 	      __from_next = reinterpret_cast<const intern_type*>(__cfrom);
 	      __to_next = reinterpret_cast<extern_type*>(__cto);
 	      __ret = codecvt_base::ok;
 	    }
 	  else
 	    {
 	      if (__fbytes < __fmultiple * (__from_end - __from))
 		{
 		  __from_next = reinterpret_cast<const intern_type*>(__cfrom);
 		  __to_next = reinterpret_cast<extern_type*>(__cto);
 		  __ret = codecvt_base::partial;
 		}
 	      else
 		__ret = codecvt_base::error;
 	    }
 	}
       return __ret;
     }

   template<typename _InternT, typename _ExternT>
     codecvt_base::result
     codecvt<_InternT, _ExternT, encoding_state>::
     do_unshift(state_type& __state, extern_type* __to,
 	       extern_type* __to_end, extern_type*& __to_next) const
     {
       result __ret = codecvt_base::error;
       if (__state.good())
 	{
 	  const descriptor_type& __desc = __state.in_descriptor();
 	  const size_t __tmultiple = sizeof(intern_type);
 	  size_t __tlen = __tmultiple * (__to_end - __to);

 	  // Argument list for iconv specifies a byte sequence. Thus,
 	  // all to/from arrays must be brutally casted to char*.
 	  char* __cto = reinterpret_cast<char*>(__to);
 	  size_t __conv = __iconv_adaptor(iconv,__desc, NULL, NULL,
                                           &__cto, &__tlen);

 	  if (__conv != size_t(-1))
 	    {
 	      __to_next = reinterpret_cast<extern_type*>(__cto);
 	      if (__tlen == __tmultiple * (__to_end - __to))
 		__ret = codecvt_base::noconv;
 	      else if (__tlen == 0)
 		__ret = codecvt_base::ok;
 	      else
 		__ret = codecvt_base::partial;
 	    }
 	  else
 	    __ret = codecvt_base::error;
 	}
       return __ret;
     }

   template<typename _InternT, typename _ExternT>
     codecvt_base::result
     codecvt<_InternT, _ExternT, encoding_state>::
     do_in(state_type& __state, const extern_type* __from,
 	  const extern_type* __from_end, const extern_type*& __from_next,
 	  intern_type* __to, intern_type* __to_end,
 	  intern_type*& __to_next) const
     {
       result __ret = codecvt_base::error;
       if (__state.good())
 	{
 	  const descriptor_type& __desc = __state.in_descriptor();
 	  const size_t __fmultiple = sizeof(extern_type);
 	  size_t __flen = __fmultiple * (__from_end - __from);
 	  const size_t __tmultiple = sizeof(intern_type);
 	  size_t __tlen = __tmultiple * (__to_end - __to);

 	  // Argument list for iconv specifies a byte sequence. Thus,
 	  // all to/from arrays must be brutally casted to char*.
 	  char* __cto = reinterpret_cast<char*>(__to);
 	  char* __cfrom;
 	  size_t __conv;

 	  // Some encodings need a byte order marker as the first item
 	  // in the byte stream, to designate endian-ness. The default
 	  // value for the byte order marker is NULL, so if this is
 	  // the case, it's not necessary and we can just go on our
 	  // merry way.
 	  int __ext_bom = __state.external_bom();
 	  if (__ext_bom)
 	    {
 	      size_t __size = __from_end - __from;
 	      extern_type* __cfixed =  static_cast<extern_type*>
 		(__builtin_alloca(sizeof(extern_type) * (__size + 1)));
 	      __cfixed[0] = static_cast<extern_type>(__ext_bom);
 	      char_traits<extern_type>::copy(__cfixed + 1, __from, __size);
 	      __cfrom = reinterpret_cast<char*>(__cfixed);
 	      __conv = __iconv_adaptor(iconv, __desc, &__cfrom,
                                        &__flen, &__cto, &__tlen);
 	    }
 	  else
 	    {
 	      extern_type* __cfixed = const_cast<extern_type*>(__from);
 	      __cfrom = reinterpret_cast<char*>(__cfixed);
 	      __conv = __iconv_adaptor(iconv, __desc, &__cfrom,
                                        &__flen, &__cto, &__tlen);
 	    }


 	  if (__conv != size_t(-1))
 	    {
 	      __from_next = reinterpret_cast<const extern_type*>(__cfrom);
 	      __to_next = reinterpret_cast<intern_type*>(__cto);
 	      __ret = codecvt_base::ok;
 	    }
 	  else
 	    {
 	      if (__flen < static_cast<size_t>(__from_end - __from))
 		{
 		  __from_next = reinterpret_cast<const extern_type*>(__cfrom);
 		  __to_next = reinterpret_cast<intern_type*>(__cto);
 		  __ret = codecvt_base::partial;
 		}
 	      else
 		__ret = codecvt_base::error;
 	    }
 	}
       return __ret;
     }

   template<typename _InternT, typename _ExternT>
     int
     codecvt<_InternT, _ExternT, encoding_state>::
     do_encoding() const throw()
     {
       int __ret = 0;
       if (sizeof(_ExternT) <= sizeof(_InternT))
 	__ret = sizeof(_InternT) / sizeof(_ExternT);
       return __ret;
     }

   template<typename _InternT, typename _ExternT>
     bool
     codecvt<_InternT, _ExternT, encoding_state>::
     do_always_noconv() const throw()
     { return false; }

   template<typename _InternT, typename _ExternT>
     int
     codecvt<_InternT, _ExternT, encoding_state>::
     do_length(state_type&, const extern_type* __from,
 	      const extern_type* __end, size_t __max) const
     { return std::min(__max, static_cast<size_t>(__end - __from)); }

   // _GLIBCXX_RESOLVE_LIB_DEFECTS
   // 74.  Garbled text for codecvt::do_max_length
   template<typename _InternT, typename _ExternT>
     int
     codecvt<_InternT, _ExternT, encoding_state>::
     do_max_length() const throw()
     { return 1; }

 _GLIBCXX_END_NAMESPACE

 #endif
	// Locale support (codecvt) -- C++ --

	// Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009
	// 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/>.

	//
	// ISO C++ 14882: 22.2.1.5 Template class codecvt
	//

	// Written by Benjamin Kosnik <bkoz@redhat.com>

	/** @file ext/codecvt_specializations.h
	* This file is a GNU extension to the Standard C++ Library.
	*/

	#ifndef _EXT_CODECVT_SPECIALIZATIONS_H
	#define _EXT_CODECVT_SPECIALIZATIONS_H 1

	#include <bits/c++config.h>
	#include <locale>
	#include <iconv.h>

	_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

	/// Extension to use iconv for dealing with character encodings.
	// This includes conversions and comparisons between various character
	// sets. This object encapsulates data that may need to be shared between
	// char_traits, codecvt and ctype.
	class encoding_state
	{
	public:
	// Types:
	// NB: A conversion descriptor subsumes and enhances the
	// functionality of a simple state type such as mbstate_t.
	typedef iconv_t descriptor_type;

	protected:
	// Name of internal character set encoding.
	std::string _M_int_enc;

	// Name of external character set encoding.
	std::string _M_ext_enc;

	// Conversion descriptor between external encoding to internal encoding.
	descriptor_type _M_in_desc;

	// Conversion descriptor between internal encoding to external encoding.
	descriptor_type _M_out_desc;

	// The byte-order marker for the external encoding, if necessary.
	int _M_ext_bom;

	// The byte-order marker for the internal encoding, if necessary.
	int _M_int_bom;

	// Number of external bytes needed to construct one complete
	// character in the internal encoding.
	// NB: -1 indicates variable, or stateful, encodings.
	int _M_bytes;

	public:
	explicit
	encoding_state()
	: _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0), _M_bytes(0)
	{ }

	explicit
	encoding_state(const char* __int, const char* __ext,
	int __ibom = 0, int __ebom = 0, int __bytes = 1)
	: _M_int_enc(__int), _M_ext_enc(__ext), _M_in_desc(0), _M_out_desc(0),
	_M_ext_bom(__ebom), _M_int_bom(__ibom), _M_bytes(__bytes)
	{ init(); }

	// 21.1.2 traits typedefs
	// p4
	// typedef STATE_T state_type
	// requires: state_type shall meet the requirements of
	// CopyConstructible types (20.1.3)
	// NB: This does not preserve the actual state of the conversion
	// descriptor member, but it does duplicate the encoding
	// information.
	encoding_state(const encoding_state& __obj) : _M_in_desc(0), _M_out_desc(0)
	{ construct(__obj); }

	// Need assignment operator as well.
	encoding_state&
	operator=(const encoding_state& __obj)
	{
	construct(__obj);
	return *this;
	}

	~encoding_state()
	{ destroy(); }

	bool
	good() const throw()
	{
	const descriptor_type __err = (iconv_t)(-1);
	bool __test = _M_in_desc && _M_in_desc != __err;
	__test &= _M_out_desc && _M_out_desc != __err;
	return __test;
	}

	int
	character_ratio() const
	{ return _M_bytes; }

	const std::string
	internal_encoding() const
	{ return _M_int_enc; }

	int
	internal_bom() const
	{ return _M_int_bom; }

	const std::string
	external_encoding() const
	{ return _M_ext_enc; }

	int
	external_bom() const
	{ return _M_ext_bom; }

	const descriptor_type&
	in_descriptor() const
	{ return _M_in_desc; }

	const descriptor_type&
	out_descriptor() const
	{ return _M_out_desc; }

	protected:
	void
	init()
	{
	const descriptor_type __err = (iconv_t)(-1);
	const bool __have_encodings = _M_int_enc.size() && _M_ext_enc.size();
	if (!_M_in_desc && __have_encodings)
	{
	_M_in_desc = iconv_open(_M_int_enc.c_str(), _M_ext_enc.c_str());
	if (_M_in_desc == __err)
	std::__throw_runtime_error(__N("encoding_state::_M_init "
	"creating iconv input descriptor failed"));
	}
	if (!_M_out_desc && __have_encodings)
	{
	_M_out_desc = iconv_open(_M_ext_enc.c_str(), _M_int_enc.c_str());
	if (_M_out_desc == __err)
	std::__throw_runtime_error(__N("encoding_state::_M_init "
	"creating iconv output descriptor failed"));
	}
	}

	void
	construct(const encoding_state& __obj)
	{
	destroy();
	_M_int_enc = __obj._M_int_enc;
	_M_ext_enc = __obj._M_ext_enc;
	_M_ext_bom = __obj._M_ext_bom;
	_M_int_bom = __obj._M_int_bom;
	_M_bytes = __obj._M_bytes;
	init();
	}

	void
	destroy() throw()
	{
	const descriptor_type __err = (iconv_t)(-1);
	if (_M_in_desc && _M_in_desc != __err)
	{
	iconv_close(_M_in_desc);
	_M_in_desc = 0;
	}
	if (_M_out_desc && _M_out_desc != __err)
	{
	iconv_close(_M_out_desc);
	_M_out_desc = 0;
	}
	}
	};

	/// encoding_char_traits
	// Custom traits type with encoding_state for the state type, and the
	// associated fpos<encoding_state> for the position type, all other
	// bits equivalent to the required char_traits instantiations.
	template<typename _CharT>
	struct encoding_char_traits : public std::char_traits<_CharT>
	{
	typedef encoding_state state_type;
	typedef typename std::fpos<state_type> pos_type;
	};

	_GLIBCXX_END_NAMESPACE


	_GLIBCXX_BEGIN_NAMESPACE(std)

	using __gnu_cxx::encoding_state;

	/// codecvt<InternT, _ExternT, encoding_state> specialization.
	// This partial specialization takes advantage of iconv to provide
	// code conversions between a large number of character encodings.
	template<typename _InternT, typename _ExternT>
	class codecvt<_InternT, _ExternT, encoding_state>
	: public __codecvt_abstract_base<_InternT, _ExternT, encoding_state>
	{
	public:
	// Types:
	typedef codecvt_base::result result;
	typedef _InternT intern_type;
	typedef _ExternT extern_type;
	typedef __gnu_cxx::encoding_state state_type;
	typedef state_type::descriptor_type descriptor_type;

	// Data Members:
	static locale::id id;

	explicit
	codecvt(size_t __refs = 0)
	: __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
	{ }

	explicit
	codecvt(state_type& __enc, size_t __refs = 0)
	: __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
	{ }

	protected:
	virtual
	~codecvt() { }

	virtual result
	do_out(state_type& __state, const intern_type* __from,
	const intern_type* __from_end, const intern_type*& __from_next,
	extern_type* __to, extern_type* __to_end,
	extern_type*& __to_next) const;

	virtual result
	do_unshift(state_type& __state, extern_type* __to,
	extern_type* __to_end, extern_type*& __to_next) const;

	virtual result
	do_in(state_type& __state, const extern_type* __from,
	const extern_type* __from_end, const extern_type*& __from_next,
	intern_type* __to, intern_type* __to_end,
	intern_type*& __to_next) const;

	virtual int
	do_encoding() const throw();

	virtual bool
	do_always_noconv() const throw();

	virtual int
	do_length(state_type&, const extern_type* __from,
	const extern_type* __end, size_t __max) const;

	virtual int
	do_max_length() const throw();
	};

	template<typename _InternT, typename _ExternT>
	locale::id
	codecvt<_InternT, _ExternT, encoding_state>::id;

	// This adaptor works around the signature problems of the second
	// argument to iconv(): SUSv2 and others use 'const char**', but glibc 2.2
	// uses 'char**', which matches the POSIX 1003.1-2001 standard.
	// Using this adaptor, g++ will do the work for us.
	template<typename _Tp>
	inline size_t
	__iconv_adaptor(size_t(__func)(iconv_t, _Tp, size_t, char*, size_t),
	iconv_t __cd, char** __inbuf, size_t* __inbytes,
	char** __outbuf, size_t* __outbytes)
	{ return __func(__cd, (_Tp)__inbuf, __inbytes, __outbuf, __outbytes); }

	template<typename _InternT, typename _ExternT>
	codecvt_base::result
	codecvt<_InternT, _ExternT, encoding_state>::
	do_out(state_type& __state, const intern_type* __from,
	const intern_type* __from_end, const intern_type*& __from_next,
	extern_type* __to, extern_type* __to_end,
	extern_type*& __to_next) const
	{
	result __ret = codecvt_base::error;
	if (__state.good())
	{
	const descriptor_type& __desc = __state.out_descriptor();
	const size_t __fmultiple = sizeof(intern_type);
	size_t __fbytes = __fmultiple * (__from_end - __from);
	const size_t __tmultiple = sizeof(extern_type);
	size_t __tbytes = __tmultiple * (__to_end - __to);

	// Argument list for iconv specifies a byte sequence. Thus,
	// all to/from arrays must be brutally casted to char*.
	char* __cto = reinterpret_cast<char*>(__to);
	char* __cfrom;
	size_t __conv;

	// Some encodings need a byte order marker as the first item
	// in the byte stream, to designate endian-ness. The default
	// value for the byte order marker is NULL, so if this is
	// the case, it's not necessary and we can just go on our
	// merry way.
	int __int_bom = __state.internal_bom();
	if (__int_bom)
	{
	size_t __size = __from_end - __from;
	intern_type* __cfixed = static_cast<intern_type*>
	(__builtin_alloca(sizeof(intern_type) * (__size + 1)));
	__cfixed[0] = static_cast<intern_type>(__int_bom);
	char_traits<intern_type>::copy(__cfixed + 1, __from, __size);
	__cfrom = reinterpret_cast<char*>(__cfixed);
	__conv = __iconv_adaptor(iconv, __desc, &__cfrom,
	&__fbytes, &__cto, &__tbytes);
	}
	else
	{
	intern_type* __cfixed = const_cast<intern_type*>(__from);
	__cfrom = reinterpret_cast<char*>(__cfixed);
	__conv = __iconv_adaptor(iconv, __desc, &__cfrom, &__fbytes,
	&__cto, &__tbytes);
	}

	if (__conv != size_t(-1))
	{
	__from_next = reinterpret_cast<const intern_type*>(__cfrom);
	__to_next = reinterpret_cast<extern_type*>(__cto);
	__ret = codecvt_base::ok;
	}
	else
	{
	if (__fbytes < __fmultiple * (__from_end - __from))
	{
	__from_next = reinterpret_cast<const intern_type*>(__cfrom);
	__to_next = reinterpret_cast<extern_type*>(__cto);
	__ret = codecvt_base::partial;
	}
	else
	__ret = codecvt_base::error;
	}
	}
	return __ret;
	}

	template<typename _InternT, typename _ExternT>
	codecvt_base::result
	codecvt<_InternT, _ExternT, encoding_state>::
	do_unshift(state_type& __state, extern_type* __to,
	extern_type* __to_end, extern_type*& __to_next) const
	{
	result __ret = codecvt_base::error;
	if (__state.good())
	{
	const descriptor_type& __desc = __state.in_descriptor();
	const size_t __tmultiple = sizeof(intern_type);
	size_t __tlen = __tmultiple * (__to_end - __to);

	// Argument list for iconv specifies a byte sequence. Thus,
	// all to/from arrays must be brutally casted to char*.
	char* __cto = reinterpret_cast<char*>(__to);
	size_t __conv = __iconv_adaptor(iconv,__desc, NULL, NULL,
	&__cto, &__tlen);

	if (__conv != size_t(-1))
	{
	__to_next = reinterpret_cast<extern_type*>(__cto);
	if (__tlen == __tmultiple * (__to_end - __to))
	__ret = codecvt_base::noconv;
	else if (__tlen == 0)
	__ret = codecvt_base::ok;
	else
	__ret = codecvt_base::partial;
	}
	else
	__ret = codecvt_base::error;
	}
	return __ret;
	}

	template<typename _InternT, typename _ExternT>
	codecvt_base::result
	codecvt<_InternT, _ExternT, encoding_state>::
	do_in(state_type& __state, const extern_type* __from,
	const extern_type* __from_end, const extern_type*& __from_next,
	intern_type* __to, intern_type* __to_end,
	intern_type*& __to_next) const
	{
	result __ret = codecvt_base::error;
	if (__state.good())
	{
	const descriptor_type& __desc = __state.in_descriptor();
	const size_t __fmultiple = sizeof(extern_type);
	size_t __flen = __fmultiple * (__from_end - __from);
	const size_t __tmultiple = sizeof(intern_type);
	size_t __tlen = __tmultiple * (__to_end - __to);

	// Argument list for iconv specifies a byte sequence. Thus,
	// all to/from arrays must be brutally casted to char*.
	char* __cto = reinterpret_cast<char*>(__to);
	char* __cfrom;
	size_t __conv;

	// Some encodings need a byte order marker as the first item
	// in the byte stream, to designate endian-ness. The default
	// value for the byte order marker is NULL, so if this is
	// the case, it's not necessary and we can just go on our
	// merry way.
	int __ext_bom = __state.external_bom();
	if (__ext_bom)
	{
	size_t __size = __from_end - __from;
	extern_type* __cfixed = static_cast<extern_type*>
	(__builtin_alloca(sizeof(extern_type) * (__size + 1)));
	__cfixed[0] = static_cast<extern_type>(__ext_bom);
	char_traits<extern_type>::copy(__cfixed + 1, __from, __size);
	__cfrom = reinterpret_cast<char*>(__cfixed);
	__conv = __iconv_adaptor(iconv, __desc, &__cfrom,
	&__flen, &__cto, &__tlen);
	}
	else
	{
	extern_type* __cfixed = const_cast<extern_type*>(__from);
	__cfrom = reinterpret_cast<char*>(__cfixed);
	__conv = __iconv_adaptor(iconv, __desc, &__cfrom,
	&__flen, &__cto, &__tlen);
	}


	if (__conv != size_t(-1))
	{
	__from_next = reinterpret_cast<const extern_type*>(__cfrom);
	__to_next = reinterpret_cast<intern_type*>(__cto);
	__ret = codecvt_base::ok;
	}
	else
	{
	if (__flen < static_cast<size_t>(__from_end - __from))
	{
	__from_next = reinterpret_cast<const extern_type*>(__cfrom);
	__to_next = reinterpret_cast<intern_type*>(__cto);
	__ret = codecvt_base::partial;
	}
	else
	__ret = codecvt_base::error;
	}
	}
	return __ret;
	}

	template<typename _InternT, typename _ExternT>
	int
	codecvt<_InternT, _ExternT, encoding_state>::
	do_encoding() const throw()
	{
	int __ret = 0;
	if (sizeof(_ExternT) <= sizeof(_InternT))
	__ret = sizeof(_InternT) / sizeof(_ExternT);
	return __ret;
	}

	template<typename _InternT, typename _ExternT>
	bool
	codecvt<_InternT, _ExternT, encoding_state>::
	do_always_noconv() const throw()
	{ return false; }

	template<typename _InternT, typename _ExternT>
	int
	codecvt<_InternT, _ExternT, encoding_state>::
	do_length(state_type&, const extern_type* __from,
	const extern_type* __end, size_t __max) const
	{ return std::min(__max, static_cast<size_t>(__end - __from)); }

	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 74. Garbled text for codecvt::do_max_length
	template<typename _InternT, typename _ExternT>
	int
	codecvt<_InternT, _ExternT, encoding_state>::
	do_max_length() const throw()
	{ return 1; }

	_GLIBCXX_END_NAMESPACE

	#endif