codecvt.h

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      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 is what the standard is (apparently) due to use
  // in the future.  Using this adaptor, g++ will do the work for us.
  template<typename _T>
    inline size_t
    __iconv_adaptor(size_t(*iconv_func)(iconv_t, _T, size_t*, char**, size_t*),
                    iconv_t cd, char** inbuf, size_t* inbytesleft,
                    char** outbuf, size_t* outbytesleft)
    {
      return iconv_func(cd, (_T)inbuf, inbytesleft, outbuf, outbytesleft);
    }

  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) / sizeof(char);
	  size_t __flen = __fmultiple * (__from_end - __from);
	  const size_t __tmultiple = sizeof(extern_type) / sizeof(char);
	  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 __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,
                                        &__flen, &__cto, &__tlen); 
	    }
	  else
	    {
	      intern_type* __cfixed = const_cast<intern_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 intern_type*>(__cfrom);
	      __to_next = reinterpret_cast<extern_type*>(__cto);
	      __ret = ok;
	    }
	  else 
	    {
	      if (__flen < static_cast<size_t>(__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) / sizeof(char);
	  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) / sizeof(char);
	  size_t __flen = __fmultiple * (__from_end - __from);
	  const size_t __tmultiple = sizeof(intern_type) / sizeof(char);
	  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()
    { return 0; }
  
  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 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
#endif /* _GLIBCPP_USE_WCHAR_T */

  // codecvt<char, char, mbstate_t> required specialization
  template<>
    class codecvt<char, char, mbstate_t> 
    : public __codecvt_abstract_base<char, char, mbstate_t>
    {
    public:      
      // Types:
      typedef char 	intern_type;
      typedef char 	extern_type;
      typedef mbstate_t state_type;

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

      explicit 
      codecvt(size_t __refs = 0);

    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();
  };

#ifdef _GLIBCPP_USE_WCHAR_T
  // codecvt<wchar_t, char, mbstate_t> required specialization
  template<>
    class codecvt<wchar_t, char, mbstate_t> 
    : public __codecvt_abstract_base<wchar_t, char, mbstate_t>
    {
    public:
      // Types:
      typedef wchar_t 	intern_type;
      typedef char 	extern_type;
      typedef mbstate_t state_type;

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

      explicit 
      codecvt(size_t __refs = 0);

    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();
    };
#endif //_GLIBCPP_USE_WCHAR_T

  // 22.2.1.6  Template class codecvt_byname
  template<typename _InternT, typename _ExternT, typename _StateT>
    class codecvt_byname : public codecvt<_InternT, _ExternT, _StateT>
    {
    public:
      explicit 
      codecvt_byname(const char*, size_t __refs = 0) 
      : codecvt<_InternT, _ExternT, _StateT>(__refs) { }
    protected:
      virtual 
      ~codecvt_byname() { }
    };

#endif // _CPP_BITS_CODECVT_H

// Local Variables:
// mode:c++
// End: