locale_facets.tcc

gcc3.2.1源代码

	  const numpunct<_CharT>& __np = use_facet<numpunct<_CharT> >(__loc); 
	  const __string_type __true = __np.truename();
	  const __string_type __false = __np.falsename();
          const char_type* __trues = __true.c_str();
          const char_type* __falses = __false.c_str();
          const size_t __truen =  __true.size() - 1;
          const size_t __falsen =  __false.size() - 1;

          for (size_t __n = 0; __beg != __end; ++__n)
            {
              char_type __c = *__beg++;
              bool __testf = __n <= __falsen 
		             ? __traits_type::eq(__c, __falses[__n]) : false;
              bool __testt = __n <= __truen 
		             ? __traits_type::eq(__c, __trues[__n]) : false;
              if (!(__testf || __testt))
                {
                  __err |= ios_base::failbit;
                  break;
                }
              else if (__testf && __n == __falsen)
                {
                  __v = 0;
                  break;
                }
              else if (__testt && __n == __truen)
                {
                  __v = 1;
                  break;
                }
            }
          if (__beg == __end)
            __err |= ios_base::eofbit;
        }
      return __beg;
    }
#endif

  template<typename _CharT, typename _InIter>
    _InIter
    num_get<_CharT, _InIter>::
    do_get(iter_type __beg, iter_type __end, ios_base& __io,
           ios_base::iostate& __err, long& __v) const
    {
      string __xtrc;
      int __base;
      __beg = _M_extract_int(__beg, __end, __io, __err, __xtrc, __base);
      __convert_to_v(__xtrc.c_str(), __v, __err, _S_c_locale, __base);
      return __beg;
    }

  template<typename _CharT, typename _InIter>
    _InIter
    num_get<_CharT, _InIter>::
    do_get(iter_type __beg, iter_type __end, ios_base& __io,
           ios_base::iostate& __err, unsigned short& __v) const
    {
      string __xtrc;
      int __base;
      __beg = _M_extract_int(__beg, __end, __io, __err, __xtrc, __base);
      unsigned long __ul;
      __convert_to_v(__xtrc.c_str(), __ul, __err, _S_c_locale, __base);
      if (!(__err & ios_base::failbit) 
	  && __ul <= numeric_limits<unsigned short>::max())
	__v = static_cast<unsigned short>(__ul);
      else 
	__err |= ios_base::failbit;
      return __beg;
    }

  template<typename _CharT, typename _InIter>
    _InIter
    num_get<_CharT, _InIter>::
    do_get(iter_type __beg, iter_type __end, ios_base& __io,
           ios_base::iostate& __err, unsigned int& __v) const
    {
      string __xtrc;
      int __base;
      __beg = _M_extract_int(__beg, __end, __io, __err, __xtrc, __base);
      unsigned long __ul;
      __convert_to_v(__xtrc.c_str(), __ul, __err, _S_c_locale, __base);
      if (!(__err & ios_base::failbit) 
	  && __ul <= numeric_limits<unsigned int>::max())
	__v = static_cast<unsigned int>(__ul);
      else 
	__err |= ios_base::failbit;
      return __beg;
    }

  template<typename _CharT, typename _InIter>
    _InIter
    num_get<_CharT, _InIter>::
    do_get(iter_type __beg, iter_type __end, ios_base& __io,
           ios_base::iostate& __err, unsigned long& __v) const
    {
      string __xtrc;
      int __base;
      __beg = _M_extract_int(__beg, __end, __io, __err, __xtrc, __base);
      __convert_to_v(__xtrc.c_str(), __v, __err, _S_c_locale, __base);
      return __beg;
    }

#ifdef _GLIBCPP_USE_LONG_LONG
  template<typename _CharT, typename _InIter>
    _InIter
    num_get<_CharT, _InIter>::
    do_get(iter_type __beg, iter_type __end, ios_base& __io,
           ios_base::iostate& __err, long long& __v) const
    {
      string __xtrc;
      int __base;
      __beg = _M_extract_int(__beg, __end, __io, __err, __xtrc, __base);
      __convert_to_v(__xtrc.c_str(), __v, __err, _S_c_locale, __base);
      return __beg;
    }

  template<typename _CharT, typename _InIter>
    _InIter
    num_get<_CharT, _InIter>::
    do_get(iter_type __beg, iter_type __end, ios_base& __io,
           ios_base::iostate& __err, unsigned long long& __v) const
    {
      string __xtrc;
      int __base;
      __beg = _M_extract_int(__beg, __end, __io, __err, __xtrc, __base);
      __convert_to_v(__xtrc.c_str(), __v, __err, _S_c_locale, __base);
      return __beg;
    }
#endif

  template<typename _CharT, typename _InIter>
    _InIter
    num_get<_CharT, _InIter>::
    do_get(iter_type __beg, iter_type __end, ios_base& __io, 
	   ios_base::iostate& __err, float& __v) const
    {
      string __xtrc;
      __xtrc.reserve(32);
      __beg = _M_extract_float(__beg, __end, __io, __err, __xtrc);
      __convert_to_v(__xtrc.c_str(), __v, __err, _S_c_locale);
      return __beg;
    }

  template<typename _CharT, typename _InIter>
    _InIter
    num_get<_CharT, _InIter>::
    do_get(iter_type __beg, iter_type __end, ios_base& __io,
           ios_base::iostate& __err, double& __v) const
    {
      string __xtrc;
      __xtrc.reserve(32);
      __beg = _M_extract_float(__beg, __end, __io, __err, __xtrc);
      __convert_to_v(__xtrc.c_str(), __v, __err, _S_c_locale);
      return __beg;
    }

  template<typename _CharT, typename _InIter>
    _InIter
    num_get<_CharT, _InIter>::
    do_get(iter_type __beg, iter_type __end, ios_base& __io,
           ios_base::iostate& __err, long double& __v) const
    {
      string __xtrc;
      __xtrc.reserve(32);
      __beg = _M_extract_float(__beg, __end, __io, __err, __xtrc);
      __convert_to_v(__xtrc.c_str(), __v, __err, _S_c_locale);
      return __beg;
    }

  template<typename _CharT, typename _InIter>
    _InIter
    num_get<_CharT, _InIter>::
    do_get(iter_type __beg, iter_type __end, ios_base& __io,
           ios_base::iostate& __err, void*& __v) const
    {
      // Prepare for hex formatted input
      typedef ios_base::fmtflags        fmtflags;
      fmtflags __fmt = __io.flags();
      fmtflags __fmtmask = ~(ios_base::showpos | ios_base::basefield
                             | ios_base::uppercase | ios_base::internal);
      __io.flags(__fmt & __fmtmask | (ios_base::hex | ios_base::showbase));

      string __xtrc;
      int __base;
      __beg = _M_extract_int(__beg, __end, __io, __err, __xtrc, __base);

      // Reset from hex formatted input
      __io.flags(__fmt);

      unsigned long __ul;
      __convert_to_v(__xtrc.c_str(), __ul, __err, _S_c_locale, __base);
      if (!(__err & ios_base::failbit))
	__v = reinterpret_cast<void*>(__ul);
      else 
	__err |= ios_base::failbit;
      return __beg;
    }

  // The following code uses snprintf (or sprintf(), when _GLIBCPP_USE_C99
  // is not defined) to convert floating point values for insertion into a
  // stream.  An optimization would be to replace them with code that works
  // directly on a wide buffer and then use __pad to do the padding.
  // It would be good to replace them anyway to gain back the efficiency
  // that C++ provides by knowing up front the type of the values to insert.
  // Also, sprintf is dangerous since may lead to accidental buffer overruns.
  // This implementation follows the C++ standard fairly directly as
  // outlined in 22.2.2.2 [lib.locale.num.put]
  template<typename _CharT, typename _OutIter>
    template<typename _ValueT>
      _OutIter
      num_put<_CharT, _OutIter>::
      _M_convert_float(_OutIter __s, ios_base& __io, _CharT __fill, char __mod,
		       _ValueT __v) const
      {
	// Note: digits10 is rounded down.  We need to add 1 to ensure
	// we get the full available precision.
	const int __max_digits = numeric_limits<_ValueT>::digits10 + 1;
	streamsize __prec = __io.precision();

	if (__prec > static_cast<streamsize>(__max_digits))
	  __prec = static_cast<streamsize>(__max_digits);

	// Long enough for the max format spec.
	char __fbuf[16];

	// [22.2.2.2.2] Stage 1, numeric conversion to character.
	int __len;
#ifdef _GLIBCPP_USE_C99
	// First try a buffer perhaps big enough (for sure sufficient for
	// non-ios_base::fixed outputs)
	int __cs_size = __max_digits * 3;
	char* __cs = static_cast<char*>(__builtin_alloca(__cs_size));

	const bool __fp = _S_format_float(__io, __fbuf, __mod, __prec);
	if (__fp)
	  __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, 
				   _S_c_locale, __prec);
	else
	  __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, _S_c_locale);

	// If the buffer was not large enough, try again with the correct size.
	if (__len >= __cs_size)
	  {
	    __cs_size = __len + 1; 
	    __cs = static_cast<char*>(__builtin_alloca(__cs_size));
	    if (__fp)
	      __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, 
				       _S_c_locale, __prec);
	    else
	      __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, 
				       _S_c_locale);
	  }
#else
	// Consider the possibility of long ios_base::fixed outputs
	const bool __fixed = __io.flags() & ios_base::fixed;
	const int __max_exp = numeric_limits<_ValueT>::max_exponent10;
	// ios_base::fixed outputs may need up to __max_exp+1 chars
	// for the integer part + up to __max_digits chars for the
	// fractional part + 3 chars for sign, decimal point, '\0'. On
	// the other hand, for non-fixed outputs __max_digits*3 chars
	// are largely sufficient.
	const int __cs_size = __fixed ? __max_exp + __max_digits + 4 
	                              : __max_digits * 3;
	char* __cs = static_cast<char*>(__builtin_alloca(__cs_size));

	if (_S_format_float(__io, __fbuf, __mod, __prec))
	  __len = __convert_from_v(__cs, 0, __fbuf, __v, _S_c_locale, __prec);
	else
	  __len = __convert_from_v(__cs, 0, __fbuf, __v, _S_c_locale);
#endif
	return _M_widen_float(__s, __io, __fill, __cs, __len);
      }

  template<typename _CharT, typename _OutIter>
    template<typename _ValueT>
      _OutIter
      num_put<_CharT, _OutIter>::
      _M_convert_int(_OutIter __s, ios_base& __io, _CharT __fill, char __mod,
		     char __modl, _ValueT __v) const
      {
	// [22.2.2.2.2] Stage 1, numeric conversion to character.

	// Long enough for the max format spec.
	char __fbuf[16];
	_S_format_int(__io, __fbuf, __mod, __modl);
#ifdef _GLIBCPP_USE_C99
	// First try a buffer perhaps big enough.
	int __cs_size = 64;
	char* __cs = static_cast<char*>(__builtin_alloca(__cs_size));
	int __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, 
				     _S_c_locale);
	// If the buffer was not large enough, try again with the correct size.
	if (__len >= __cs_size)
	  {
	    __cs_size = __len + 1;
	    __cs = static_cast<char*>(__builtin_alloca(__cs_size));
	    __len = __convert_from_v(__cs, __cs_size, __fbuf, __v, 
				     _S_c_locale);
	  }
#else
	// Leave room for "+/-," "0x," and commas. This size is
	// arbitrary, but should be largely sufficient.
	char __cs[128];
	int __len = __convert_from_v(__cs, 0, __fbuf, __v, _S_c_locale);
#endif
	return _M_widen_int(__s, __io, __fill, __cs, __len);
      }

  template<typename _CharT, typename _OutIter>
    _OutIter
    num_put<_CharT, _OutIter>::
    _M_widen_float(_OutIter __s, ios_base& __io, _CharT __fill, char* __cs, 
		   int __len) const
    {
      typedef char_traits<_CharT> 		__traits_type;
      // [22.2.2.2.2] Stage 2, convert to char_type, using correct
      // numpunct.decimal_point() values for '.' and adding grouping.
      const locale __loc = __io.getloc();
      const ctype<_CharT>& __ctype = use_facet<ctype<_CharT> >(__loc);
      _CharT* __ws = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) 
							   * __len));
      // Grouping can add (almost) as many separators as the number of
      // digits, but no more.
      _CharT* __ws2 = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) 
			 				    * __len * 2));
      __ctype.widen(__cs, __cs + __len, __ws);
      
      // Replace decimal point.
      const _CharT* __p;
      const numpunct<_CharT>& __np = use_facet<numpunct<_CharT> >(__loc);
      if (__p = __traits_type::find(__ws, __len, __ctype.widen('.')))
	__ws[__p - __ws] = __np.decimal_point();

#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
//282. What types does numpunct grouping refer to?
      // Add grouping, if necessary. 
      const string __grouping = __np.grouping();
      ios_base::fmtflags __basefield = __io.flags() & ios_base::basefield;
      if (__grouping.size())
	{
	  _CharT* __p2;
	  int __declen = __p ? __p - __ws : __len;
	  __p2 = __add_grouping(__ws2, __np.thousands_sep(), 
				__grouping.c_str(),
				__grouping.c_str() + __grouping.size(),
				__ws, __ws + __declen);
	  int __newlen = __p2 - __ws2;
	
	  // Tack on decimal part.
	  if (__p)
	    {
	      __traits_type::copy(__p2, __p, __len - __declen);
	      __newlen += __len - __declen;
	    }    

	  // Switch strings, establish correct new length.
	  __ws = __ws2;
	  __len = __newlen;
	}
#endif
      return _M_insert(__s, __io, __fill, __ws, __len);
    }

  template<typename _CharT, typename _OutIter>
    _OutIter
    num_put<_CharT, _OutIter>::
    _M_widen_int(_OutIter __s, ios_base& __io, _CharT __fill, char* __cs, 
		 int __len) const
    {
      // [22.2.2.2.2] Stage 2, convert to char_type, using correct
      // numpunct.decimal_point() values for '.' and adding grouping.
      const locale __loc = __io.getloc();
      const ctype<_CharT>& __ctype = use_facet<ctype<_CharT> >(__loc);
      _CharT* __ws = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) 
							   * __len));
      // Grouping can add (almost) as many separators as the number of
      // digits, but no more.
      _CharT* __ws2 = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) 
							    * __len * 2));
      __ctype.widen(__cs, __cs + __len, __ws);

      // Add grouping, if necessary. 
      const numpunct<_CharT>& __np = use_facet<numpunct<_CharT> >(__loc);
      const string __grouping = __np.grouping();
      const ios_base::fmtflags __basefield = __io.flags() & ios_base::basefield;
      if (__grouping.size())
	{
	  // By itself __add_grouping cannot deal correctly with __ws when
	  // ios::showbase is set and ios_base::oct || ios_base::hex.
	  // Therefore we take care "by hand" of the initial 0, 0x or 0X.
	  // However, remember that the latter do not occur if the number
	  // printed is '0' (__len == 1).
	  streamsize __off = 0;
	  if ((__io.flags() & ios_base::showbase) && __len > 1)
	    if (__basefield == ios_base::oct)
	      {
		__off = 1;
		*__ws2 = *__ws;
	      }
	    else if (__basefield == ios_base::hex)
	      {
		__off = 2;
		*__ws2 = *__ws;
		*(__ws2 + 1) = *(__ws + 1);
	      }
	  _CharT* __p;
	  __p = __add_grouping(__ws2 + __off, __np.thousands_sep(), 
			       __grouping.c_str(),
			       __grouping.c_str() + __grouping.size(),
			       __ws + __off, __ws + __len);