[thirdparty/gcc.git] / libstdc++-v3 / config / locale / ieee_1003.1-2001 / codecvt_specializations.h

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

// Copyright (C) 2000, 2001, 2002 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// 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.

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

// Warning: this file is not meant for user inclusion.  Use <locale>.

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

  // XXX
  // Define this here to codecvt.cc can have _S_max_size definition.
#define _GLIBCPP_USE___ENC_TRAITS 1

  // Extension to use icov for dealing with character encodings,
  // including conversions and comparisons between various character
  // sets.  This object encapsulates data that may need to be shared between
  // char_traits, codecvt and ctype.
  class __enc_traits
  {
  public:
    // Types: 
    // NB: A conversion descriptor subsumes and enhances the
    // functionality of a simple state type such as mbstate_t.
    typedef iconv_t	__desc_type;
    
  protected:
    // Data Members:
    // Max size of charset encoding name
    static const int 	_S_max_size = 32;
    // Name of internal character set encoding.
    char	       	_M_int_enc[_S_max_size];
    // Name of external character set encoding.
    char  	       	_M_ext_enc[_S_max_size];

    // Conversion descriptor between external encoding to internal encoding.
    __desc_type		_M_in_desc;
    // Conversion descriptor between internal encoding to external encoding.
    __desc_type		_M_out_desc;

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

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

  public:
    explicit __enc_traits() 
    : _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0) 
    {
      memset(_M_int_enc, 0, _S_max_size);
      memset(_M_ext_enc, 0, _S_max_size);
    }

    explicit __enc_traits(const char* __int, const char* __ext, 
			  int __ibom = 0, int __ebom = 0)
    : _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0)
    {
      strncpy(_M_int_enc, __int, _S_max_size);
      strncpy(_M_ext_enc, __ext, _S_max_size);
    }

    // 21.1.2 traits typedefs
    // p4
    // typedef STATE_T state_type
    // requires: state_type shall meet the requirements of
    // CopyConstructible types (20.1.3)
    __enc_traits(const __enc_traits& __obj): _M_in_desc(0), _M_out_desc(0)
    {
      strncpy(_M_int_enc, __obj._M_int_enc, _S_max_size);
      strncpy(_M_ext_enc, __obj._M_ext_enc, _S_max_size);
      _M_ext_bom = __obj._M_ext_bom;
      _M_int_bom = __obj._M_int_bom;
    }

    // Need assignment operator as well.
    __enc_traits&
    operator=(const __enc_traits& __obj)
    {
      strncpy(_M_int_enc, __obj._M_int_enc, _S_max_size);
      strncpy(_M_ext_enc, __obj._M_ext_enc, _S_max_size);
      _M_in_desc = 0;
      _M_out_desc = 0;
      _M_ext_bom = __obj._M_ext_bom;
      _M_int_bom = __obj._M_int_bom;
      return *this;
    }

    ~__enc_traits()
    {
      __desc_type __err = reinterpret_cast<iconv_t>(-1);
      if (_M_in_desc && _M_in_desc != __err) 
	iconv_close(_M_in_desc);
      if (_M_out_desc && _M_out_desc != __err) 
	iconv_close(_M_out_desc);
    } 

    void
    _M_init()
    {
      const __desc_type __err = reinterpret_cast<iconv_t>(-1);
      if (!_M_in_desc)
	{
	  _M_in_desc = iconv_open(_M_int_enc, _M_ext_enc);
	  if (_M_in_desc == __err)
	    __throw_runtime_error("creating iconv input descriptor failed.");
	}
      if (!_M_out_desc)
	{
	  _M_out_desc = iconv_open(_M_ext_enc, _M_int_enc);
	  if (_M_out_desc == __err)
	    __throw_runtime_error("creating iconv output descriptor failed.");
	}
    }

    bool
    _M_good()
    { 
      const __desc_type __err = reinterpret_cast<iconv_t>(-1);
      bool __test = _M_in_desc && _M_in_desc != __err; 
      __test &=  _M_out_desc && _M_out_desc != __err;
      return __test;
    }

    const __desc_type* 
    _M_get_in_descriptor()
    { return &_M_in_desc; }

    const __desc_type* 
    _M_get_out_descriptor()
    { return &_M_out_desc; }

    int 
    _M_get_external_bom()
    { return _M_ext_bom; }

    int 
    _M_get_internal_bom()
    { return _M_int_bom; }

    const char* 
    _M_get_internal_enc()
    { return _M_int_enc; }

    const char* 
    _M_get_external_enc()
    { return _M_ext_enc; }
  };

  // Partial specialization
  // This 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, __enc_traits>
    : public __codecvt_abstract_base<_InternT, _ExternT, __enc_traits>
    {
    public:      
      // Types:
      typedef codecvt_base::result			result;
      typedef _InternT 					intern_type;
      typedef _ExternT 					extern_type;
      typedef __enc_traits 				state_type;
      typedef __enc_traits::__desc_type 		__desc_type;
      typedef __enc_traits				__enc_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(__enc_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(const 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, __enc_traits>::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 _T>
    inline size_t
    __iconv_adaptor(size_t(*__func)(iconv_t, _T, size_t*, char**, size_t*),
                    iconv_t __cd, char** __inbuf, size_t* __inbytes,
                    char** __outbuf, size_t* __outbytes)
    { return __func(__cd, (_T)__inbuf, __inbytes, __outbuf, __outbytes); }

  template<typename _InternT, typename _ExternT>
    codecvt_base::result
    codecvt<_InternT, _ExternT, __enc_traits>::
    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 = error;
      if (__state._M_good())
	{
	  typedef state_type::__desc_type	__desc_type;
	  const __desc_type* __desc = __state._M_get_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._M_get_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 = ok;
	    }
	  else 
	    {
	      if (__fbytes < __fmultiple * (__from_end - __from))
		{
		  __from_next = reinterpret_cast<const intern_type*>(__cfrom);
		  __to_next = reinterpret_cast<extern_type*>(__cto);
		  __ret = partial;
		}
	      else
		__ret = error;
	    }
	}
      return __ret; 
    }

  template<typename _InternT, typename _ExternT>
    codecvt_base::result
    codecvt<_InternT, _ExternT, __enc_traits>::
    do_unshift(state_type& __state, extern_type* __to, 
	       extern_type* __to_end, extern_type*& __to_next) const
    {
      result __ret = error;
      if (__state._M_good())
	{
	  typedef state_type::__desc_type	__desc_type;
	  const __desc_type* __desc = __state._M_get_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 = noconv;
	      else if (__tlen == 0)
		__ret = ok;
	      else
		__ret = partial;
	    }
	  else 
	    __ret = error;
	}
      return __ret; 
    }
   
  template<typename _InternT, typename _ExternT>
    codecvt_base::result
    codecvt<_InternT, _ExternT, __enc_traits>::
    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 = error;
      if (__state._M_good())
	{
	  typedef state_type::__desc_type	__desc_type;
	  const __desc_type* __desc = __state._M_get_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._M_get_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 = 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 = partial;
		}
	      else
		__ret = error;
	    }
	}
      return __ret; 
    }
  
  template<typename _InternT, typename _ExternT>
    int 
    codecvt<_InternT, _ExternT, __enc_traits>::
    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, __enc_traits>::
    do_always_noconv() const throw()
    { return false; }
  
  template<typename _InternT, typename _ExternT>
    int 
    codecvt<_InternT, _ExternT, __enc_traits>::
    do_length(const state_type&, const extern_type* __from, 
	      const extern_type* __end, size_t __max) const
    { return std::min(__max, static_cast<size_t>(__end - __from)); }

#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 74.  Garbled text for codecvt::do_max_length
  template<typename _InternT, typename _ExternT>
    int 
    codecvt<_InternT, _ExternT, __enc_traits>::
    do_max_length() const throw()
    { return 1; }
#endif
Commit	Line	Data
33590f13 BK	1	// Locale support (codecvt) -- C++ --
33590f13 BK	2
6f48900c	3	// Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
33590f13 BK	4	//
	5	// This file is part of the GNU ISO C++ Library. This library is free
	6	// software; you can redistribute it and/or modify it under the
	7	// terms of the GNU General Public License as published by the
	8	// Free Software Foundation; either version 2, or (at your option)
	9	// any later version.
	10
	11	// This library is distributed in the hope that it will be useful,
	12	// but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	// GNU General Public License for more details.
	15
	16	// You should have received a copy of the GNU General Public License along
	17	// with this library; see the file COPYING. If not, write to the Free
	18	// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
	19	// USA.
	20
	21	// As a special exception, you may use this file as part of a free software
	22	// library without restriction. Specifically, if other files instantiate
	23	// templates or use macros or inline functions from this file, or you compile
	24	// this file and link it with other files to produce an executable, this
	25	// file does not by itself cause the resulting executable to be covered by
	26	// the GNU General Public License. This exception does not however
	27	// invalidate any other reasons why the executable file might be covered by
	28	// the GNU General Public License.
	29
	30	//
	31	// ISO C++ 14882: 22.2.1.5 Template class codecvt
	32	//
	33
	34	// Warning: this file is not meant for user inclusion. Use <locale>.
	35
	36	// Written by Benjamin Kosnik <bkoz@cygnus.com>
	37
6f48900c BK	38	// XXX
	39	// Define this here to codecvt.cc can have _S_max_size definition.
	40	#define _GLIBCPP_USE___ENC_TRAITS 1
33590f13	41
6f48900c BK	42	// Extension to use icov for dealing with character encodings,
	43	// including conversions and comparisons between various character
	44	// sets. This object encapsulates data that may need to be shared between
	45	// char_traits, codecvt and ctype.
33590f13 BK	46	class __enc_traits
	47	{
	48	public:
	49	// Types:
	50	// NB: A conversion descriptor subsumes and enhances the
	51	// functionality of a simple state type such as mbstate_t.
	52	typedef iconv_t __desc_type;
	53
	54	protected:
	55	// Data Members:
	56	// Max size of charset encoding name
	57	static const int _S_max_size = 32;
	58	// Name of internal character set encoding.
	59	char _M_int_enc[_S_max_size];
	60	// Name of external character set encoding.
	61	char _M_ext_enc[_S_max_size];
	62
	63	// Conversion descriptor between external encoding to internal encoding.
	64	__desc_type _M_in_desc;
	65	// Conversion descriptor between internal encoding to external encoding.
	66	__desc_type _M_out_desc;
	67
	68	// Details the byte-order marker for the external encoding, if necessary.
	69	int _M_ext_bom;
	70
	71	// Details the byte-order marker for the internal encoding, if necessary.
	72	int _M_int_bom;
	73
	74	public:
6f48900c BK	75	explicit __enc_traits()
	76	: _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0)
	77	{
	78	memset(_M_int_enc, 0, _S_max_size);
	79	memset(_M_ext_enc, 0, _S_max_size);
	80	}
	81
6f48900c BK	82	explicit __enc_traits(const char* __int, const char* __ext,
6f48900c BK	83	int __ibom = 0, int __ebom = 0)
33590f13 BK	84	: _M_in_desc(0), _M_out_desc(0), _M_ext_bom(0), _M_int_bom(0)
	85	{
	86	strncpy(_M_int_enc, __int, _S_max_size);
	87	strncpy(_M_ext_enc, __ext, _S_max_size);
	88	}
	89
	90	// 21.1.2 traits typedefs
	91	// p4
	92	// typedef STATE_T state_type
	93	// requires: state_type shall meet the requirements of
	94	// CopyConstructible types (20.1.3)
6f48900c	95	__enc_traits(const __enc_traits& __obj): _M_in_desc(0), _M_out_desc(0)
33590f13 BK	96	{
	97	strncpy(_M_int_enc, __obj._M_int_enc, _S_max_size);
	98	strncpy(_M_ext_enc, __obj._M_ext_enc, _S_max_size);
	99	_M_ext_bom = __obj._M_ext_bom;
	100	_M_int_bom = __obj._M_int_bom;
	101	}
	102
6f48900c BK	103	// Need assignment operator as well.
	104	__enc_traits&
	105	operator=(const __enc_traits& __obj)
	106	{
	107	strncpy(_M_int_enc, __obj._M_int_enc, _S_max_size);
	108	strncpy(_M_ext_enc, __obj._M_ext_enc, _S_max_size);
	109	_M_in_desc = 0;
	110	_M_out_desc = 0;
	111	_M_ext_bom = __obj._M_ext_bom;
	112	_M_int_bom = __obj._M_int_bom;
7aacf989	113	return *this;
6f48900c BK	114	}
6f48900c BK	115
33590f13 BK	116	~__enc_traits()
33590f13 BK	117	{
1a808622 BK	118	__desc_type __err = reinterpret_cast<iconv_t>(-1);
	119	if (_M_in_desc && _M_in_desc != __err)
	120	iconv_close(_M_in_desc);
	121	if (_M_out_desc && _M_out_desc != __err)
	122	iconv_close(_M_out_desc);
33590f13 BK	123	}
33590f13 BK	124
33590f13 BK	125	void
	126	_M_init()
	127	{
6f48900c BK	128	const __desc_type __err = reinterpret_cast<iconv_t>(-1);
	129	if (!_M_in_desc)
	130	{
	131	_M_in_desc = iconv_open(_M_int_enc, _M_ext_enc);
	132	if (_M_in_desc == __err)
	133	__throw_runtime_error("creating iconv input descriptor failed.");
	134	}
	135	if (!_M_out_desc)
	136	{
	137	_M_out_desc = iconv_open(_M_ext_enc, _M_int_enc);
	138	if (_M_out_desc == __err)
	139	__throw_runtime_error("creating iconv output descriptor failed.");
	140	}
33590f13 BK	141	}
	142
	143	bool
	144	_M_good()
	145	{
6f48900c	146	const __desc_type __err = reinterpret_cast<iconv_t>(-1);
1a808622 BK	147	bool __test = _M_in_desc && _M_in_desc != __err;
	148	__test &= _M_out_desc && _M_out_desc != __err;
	149	return __test;
33590f13 BK	150	}
	151
	152	const __desc_type*
	153	_M_get_in_descriptor()
	154	{ return &_M_in_desc; }
	155
	156	const __desc_type*
	157	_M_get_out_descriptor()
	158	{ return &_M_out_desc; }
	159
33590f13 BK	160	int
	161	_M_get_external_bom()
	162	{ return _M_ext_bom; }
	163
	164	int
	165	_M_get_internal_bom()
	166	{ return _M_int_bom; }
6f48900c BK	167
	168	const char*
	169	_M_get_internal_enc()
	170	{ return _M_int_enc; }
	171
	172	const char*
	173	_M_get_external_enc()
	174	{ return _M_ext_enc; }
33590f13 BK	175	};
	176
	177	// Partial specialization
	178	// This specialization takes advantage of iconv to provide code
	179	// conversions between a large number of character encodings.
	180	template<typename _InternT, typename _ExternT>
	181	class codecvt<_InternT, _ExternT, __enc_traits>
	182	: public __codecvt_abstract_base<_InternT, _ExternT, __enc_traits>
	183	{
	184	public:
	185	// Types:
	186	typedef codecvt_base::result result;
	187	typedef _InternT intern_type;
	188	typedef _ExternT extern_type;
	189	typedef __enc_traits state_type;
	190	typedef __enc_traits::__desc_type __desc_type;
	191	typedef __enc_traits __enc_type;
	192
	193	// Data Members:
	194	static locale::id id;
	195
	196	explicit
	197	codecvt(size_t __refs = 0)
	198	: __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
	199	{ }
	200
	201	explicit
	202	codecvt(__enc_type* __enc, size_t __refs = 0)
	203	: __codecvt_abstract_base<intern_type, extern_type, state_type>(__refs)
	204	{ }
	205
	206	protected:
	207	virtual
	208	~codecvt() { }
	209
	210	virtual result
	211	do_out(state_type& __state, const intern_type* __from,
	212	const intern_type* __from_end, const intern_type*& __from_next,
	213	extern_type* __to, extern_type* __to_end,
	214	extern_type*& __to_next) const;
	215
	216	virtual result
	217	do_unshift(state_type& __state, extern_type* __to,
	218	extern_type* __to_end, extern_type*& __to_next) const;
	219
	220	virtual result
	221	do_in(state_type& __state, const extern_type* __from,
	222	const extern_type* __from_end, const extern_type*& __from_next,
	223	intern_type* __to, intern_type* __to_end,
	224	intern_type*& __to_next) const;
	225
	226	virtual int
	227	do_encoding() const throw();
	228
	229	virtual bool
	230	do_always_noconv() const throw();
	231
	232	virtual int
	233	do_length(const state_type&, const extern_type* __from,
	234	const extern_type* __end, size_t __max) const;
	235
	236	virtual int
	237	do_max_length() const throw();
	238	};
239
240	template<typename _InternT, typename _ExternT>
241	locale::id
242	codecvt<_InternT, _ExternT, __enc_traits>::id;
243
244	// This adaptor works around the signature problems of the second
245	// argument to iconv(): SUSv2 and others use 'const char**', but glibc 2.2
07814743 BK	246	// uses 'char**', which matches the POSIX 1003.1-2001 standard.
07814743 BK	247	// Using this adaptor, g++ will do the work for us.
33590f13 BK	248	template<typename _T>
33590f13 BK	249	inline size_t
07814743 BK	250	__iconv_adaptor(size_t(__func)(iconv_t, _T, size_t, char*, size_t),
	251	iconv_t __cd, char** __inbuf, size_t* __inbytes,
	252	char** __outbuf, size_t* __outbytes)
	253	{ return __func(__cd, (_T)__inbuf, __inbytes, __outbuf, __outbytes); }
33590f13 BK	254
	255	template<typename _InternT, typename _ExternT>
	256	codecvt_base::result
	257	codecvt<_InternT, _ExternT, __enc_traits>::
	258	do_out(state_type& __state, const intern_type* __from,
	259	const intern_type* __from_end, const intern_type*& __from_next,
	260	extern_type* __to, extern_type* __to_end,
	261	extern_type*& __to_next) const
	262	{
	263	result __ret = error;
	264	if (__state._M_good())
	265	{
	266	typedef state_type::__desc_type __desc_type;
	267	const __desc_type* __desc = __state._M_get_out_descriptor();
99b629fa	268	const size_t __fmultiple = sizeof(intern_type);
07814743	269	size_t __fbytes = __fmultiple * (__from_end - __from);
99b629fa	270	const size_t __tmultiple = sizeof(extern_type);
07814743	271	size_t __tbytes = __tmultiple * (__to_end - __to);
33590f13 BK	272
	273	// Argument list for iconv specifies a byte sequence. Thus,
	274	// all to/from arrays must be brutally casted to char*.
	275	char* __cto = reinterpret_cast<char*>(__to);
	276	char* __cfrom;
	277	size_t __conv;
	278
	279	// Some encodings need a byte order marker as the first item
	280	// in the byte stream, to designate endian-ness. The default
	281	// value for the byte order marker is NULL, so if this is
	282	// the case, it's not necessary and we can just go on our
	283	// merry way.
	284	int __int_bom = __state._M_get_internal_bom();
	285	if (__int_bom)
	286	{
	287	size_t __size = __from_end - __from;
	288	intern_type* __cfixed = static_cast<intern_type>(__builtin_alloca(sizeof(intern_type) (__size + 1)));
	289	__cfixed[0] = static_cast<intern_type>(__int_bom);
	290	char_traits<intern_type>::copy(__cfixed + 1, __from, __size);
	291	__cfrom = reinterpret_cast<char*>(__cfixed);
	292	__conv = __iconv_adaptor(iconv, *__desc, &__cfrom,
07814743	293	&__fbytes, &__cto, &__tbytes);
33590f13 BK	294	}
	295	else
	296	{
	297	intern_type* __cfixed = const_cast<intern_type*>(__from);
	298	__cfrom = reinterpret_cast<char*>(__cfixed);
07814743 BK	299	__conv = __iconv_adaptor(iconv, *__desc, &__cfrom, &__fbytes,
07814743 BK	300	&__cto, &__tbytes);
33590f13 BK	301	}
	302
	303	if (__conv != size_t(-1))
	304	{
	305	__from_next = reinterpret_cast<const intern_type*>(__cfrom);
	306	__to_next = reinterpret_cast<extern_type*>(__cto);
	307	__ret = ok;
	308	}
	309	else
	310	{
07814743	311	if (__fbytes < __fmultiple * (__from_end - __from))
33590f13 BK	312	{
	313	__from_next = reinterpret_cast<const intern_type*>(__cfrom);
	314	__to_next = reinterpret_cast<extern_type*>(__cto);
	315	__ret = partial;
	316	}
	317	else
	318	__ret = error;
	319	}
	320	}
	321	return __ret;
	322	}
	323
	324	template<typename _InternT, typename _ExternT>
	325	codecvt_base::result
	326	codecvt<_InternT, _ExternT, __enc_traits>::
	327	do_unshift(state_type& __state, extern_type* __to,
	328	extern_type* __to_end, extern_type*& __to_next) const
	329	{
	330	result __ret = error;
	331	if (__state._M_good())
	332	{
	333	typedef state_type::__desc_type __desc_type;
	334	const __desc_type* __desc = __state._M_get_in_descriptor();
99b629fa	335	const size_t __tmultiple = sizeof(intern_type);
33590f13 BK	336	size_t __tlen = __tmultiple * (__to_end - __to);
	337
	338	// Argument list for iconv specifies a byte sequence. Thus,
	339	// all to/from arrays must be brutally casted to char*.
	340	char* __cto = reinterpret_cast<char*>(__to);
	341	size_t __conv = __iconv_adaptor(iconv,*__desc, NULL, NULL,
	342	&__cto, &__tlen);
	343
	344	if (__conv != size_t(-1))
	345	{
	346	__to_next = reinterpret_cast<extern_type*>(__cto);
	347	if (__tlen == __tmultiple * (__to_end - __to))
	348	__ret = noconv;
	349	else if (__tlen == 0)
	350	__ret = ok;
	351	else
	352	__ret = partial;
	353	}
	354	else
	355	__ret = error;
	356	}
	357	return __ret;
	358	}
	359
	360	template<typename _InternT, typename _ExternT>
	361	codecvt_base::result
	362	codecvt<_InternT, _ExternT, __enc_traits>::
	363	do_in(state_type& __state, const extern_type* __from,
	364	const extern_type* __from_end, const extern_type*& __from_next,
	365	intern_type* __to, intern_type* __to_end,
	366	intern_type*& __to_next) const
	367	{
	368	result __ret = error;
	369	if (__state._M_good())
	370	{
	371	typedef state_type::__desc_type __desc_type;
	372	const __desc_type* __desc = __state._M_get_in_descriptor();
99b629fa	373	const size_t __fmultiple = sizeof(extern_type);
33590f13	374	size_t __flen = __fmultiple * (__from_end - __from);
99b629fa	375	const size_t __tmultiple = sizeof(intern_type);
33590f13 BK	376	size_t __tlen = __tmultiple * (__to_end - __to);
	377
	378	// Argument list for iconv specifies a byte sequence. Thus,
	379	// all to/from arrays must be brutally casted to char*.
	380	char* __cto = reinterpret_cast<char*>(__to);
	381	char* __cfrom;
	382	size_t __conv;
	383
	384	// Some encodings need a byte order marker as the first item
	385	// in the byte stream, to designate endian-ness. The default
	386	// value for the byte order marker is NULL, so if this is
	387	// the case, it's not necessary and we can just go on our
	388	// merry way.
	389	int __ext_bom = __state._M_get_external_bom();
	390	if (__ext_bom)
	391	{
	392	size_t __size = __from_end - __from;
	393	extern_type* __cfixed = static_cast<extern_type>(__builtin_alloca(sizeof(extern_type) (__size + 1)));
	394	__cfixed[0] = static_cast<extern_type>(__ext_bom);
	395	char_traits<extern_type>::copy(__cfixed + 1, __from, __size);
	396	__cfrom = reinterpret_cast<char*>(__cfixed);
	397	__conv = __iconv_adaptor(iconv, *__desc, &__cfrom,
	398	&__flen, &__cto, &__tlen);
	399	}
	400	else
	401	{
	402	extern_type* __cfixed = const_cast<extern_type*>(__from);
	403	__cfrom = reinterpret_cast<char*>(__cfixed);
	404	__conv = __iconv_adaptor(iconv, *__desc, &__cfrom,
	405	&__flen, &__cto, &__tlen);
	406	}
	407
	408
	409	if (__conv != size_t(-1))
	410	{
	411	__from_next = reinterpret_cast<const extern_type*>(__cfrom);
	412	__to_next = reinterpret_cast<intern_type*>(__cto);
	413	__ret = ok;
	414	}
	415	else
	416	{
	417	if (__flen < static_cast<size_t>(__from_end - __from))
	418	{
	419	__from_next = reinterpret_cast<const extern_type*>(__cfrom);
	420	__to_next = reinterpret_cast<intern_type*>(__cto);
	421	__ret = partial;
	422	}
	423	else
	424	__ret = error;
	425	}
	426	}
	427	return __ret;
	428	}
	429
	430	template<typename _InternT, typename _ExternT>
	431	int
	432	codecvt<_InternT, _ExternT, __enc_traits>::
	433	do_encoding() const throw()
07814743 BK	434	{
	435	int __ret = 0;
	436	if (sizeof(_ExternT) <= sizeof(_InternT))
	437	__ret = sizeof(_InternT)/sizeof(_ExternT);
	438	return __ret;
	439	}
33590f13 BK	440
	441	template<typename _InternT, typename _ExternT>
	442	bool
	443	codecvt<_InternT, _ExternT, __enc_traits>::
	444	do_always_noconv() const throw()
	445	{ return false; }
	446
	447	template<typename _InternT, typename _ExternT>
	448	int
	449	codecvt<_InternT, _ExternT, __enc_traits>::
	450	do_length(const state_type&, const extern_type* __from,
	451	const extern_type* __end, size_t __max) const
4977bab6	452	{ return std::min(__max, static_cast<size_t>(__end - __from)); }
33590f13 BK	453
	454	#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
	455	// 74. Garbled text for codecvt::do_max_length
	456	template<typename _InternT, typename _ExternT>
	457	int
	458	codecvt<_InternT, _ExternT, __enc_traits>::
	459	do_max_length() const throw()
	460	{ return 1; }
	461	#endif