ostream.tcc

gcc-you can use this code to learn something about gcc, and inquire further into linux,

		if (_M_fnumput->put(*this, *this, this->fill(), __n).failed())
		  this->setstate(ios_base::badbit);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->_M_setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_ostream<_CharT, _Traits>&
    basic_ostream<_CharT, _Traits>::put(char_type __c)
    { 
      sentry __cerb(*this);
      if (__cerb) 
	{
	  int_type __put = rdbuf()->sputc(__c); 
	  if (traits_type::eq_int_type(__put, traits_type::eof()))
	    this->setstate(ios_base::badbit);
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_ostream<_CharT, _Traits>&
    basic_ostream<_CharT, _Traits>::write(const _CharT* __s, streamsize __n)
    {
      sentry __cerb(*this);
      if (__cerb)
	{
	  streamsize __put = this->rdbuf()->sputn(__s, __n);
	  if ( __put != __n)
	    this->setstate(ios_base::badbit);
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_ostream<_CharT, _Traits>&
    basic_ostream<_CharT, _Traits>::flush()
    {
      sentry __cerb(*this);
      if (__cerb) 
	{
	  if (this->rdbuf() && this->rdbuf()->pubsync() == -1)
	    this->setstate(ios_base::badbit);
	}
      return *this;
    }
  
  template<typename _CharT, typename _Traits>
    typename basic_ostream<_CharT, _Traits>::pos_type
    basic_ostream<_CharT, _Traits>::tellp()
    {
      pos_type __ret = pos_type(-1);
      if (!this->fail())
	__ret = this->rdbuf()->pubseekoff(0, ios_base::cur, ios_base::out);
      return __ret;
    }


  template<typename _CharT, typename _Traits>
    basic_ostream<_CharT, _Traits>&
    basic_ostream<_CharT, _Traits>::seekp(pos_type __pos)
    {
      if (!this->fail())
	{
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 136.  seekp, seekg setting wrong streams?
	  pos_type __err = this->rdbuf()->pubseekpos(__pos, ios_base::out);

// 129. Need error indication from seekp() and seekg()
	  if (__err == pos_type(off_type(-1)))
	    this->setstate(ios_base::failbit);
#endif
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_ostream<_CharT, _Traits>&
    basic_ostream<_CharT, _Traits>::
    seekp(off_type __off, ios_base::seekdir __d)
    {
      if (!this->fail())
	{
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 136.  seekp, seekg setting wrong streams?
	  pos_type __err = this->rdbuf()->pubseekoff(__off, __d, 
						     ios_base::out);

// 129. Need error indication from seekp() and seekg()
	  if (__err == pos_type(off_type(-1)))
	    this->setstate(ios_base::failbit);
#endif
	}
      return *this;
    }

  // 27.6.2.5.4 Character inserters.
  template<typename _CharT, typename _Traits>
    basic_ostream<_CharT, _Traits>&
    operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
    {
      typedef basic_ostream<_CharT, _Traits> __ostream_type;
      typename __ostream_type::sentry __cerb(__out);
      if (__cerb)
	{
	  try 
	    {
	      const streamsize __w = __out.width() > 0 ? __out.width() : 0;
	      _CharT* __pads = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * (__w + 1)));
	      __pads[0] = __c;
	      streamsize __len = 1;
	      if (__w > __len)
		{
		  __pad<_CharT, _Traits>::_S_pad(__out, __out.fill(), __pads, 
						 &__c, __w, __len, false);
		  __len = __w;
		}
	      __out.write(__pads, __len);
	      __out.width(0);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      __out._M_setstate(ios_base::badbit);
	      if ((__out.exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return __out;
    }
  
  // Specializations.
  template <class _Traits> 
    basic_ostream<char, _Traits>&
    operator<<(basic_ostream<char, _Traits>& __out, char __c)
    {
      typedef basic_ostream<char, _Traits> __ostream_type;
      typename __ostream_type::sentry __cerb(__out);
      if (__cerb)
	{
	  try 
	    {
	      const streamsize __w = __out.width() > 0 ? __out.width() : 0;
	      char* __pads = static_cast<char*>(__builtin_alloca(__w + 1));
	      __pads[0] = __c;
	      streamsize __len = 1;
	      if (__w > __len)
		{
		  __pad<char, _Traits>::_S_pad(__out, __out.fill(), __pads, 
					       &__c, __w, __len, false);
		  __len = __w;
		}
	      __out.write(__pads, __len);
	      __out.width(0);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      __out._M_setstate(ios_base::badbit);
	      if ((__out.exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return __out;
     }

  template<typename _CharT, typename _Traits>
    basic_ostream<_CharT, _Traits>&
    operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
    {
      typedef basic_ostream<_CharT, _Traits> __ostream_type;
      typename __ostream_type::sentry __cerb(__out);
      if (__cerb && __s)
	{
	  try 
	    {
	      const streamsize __w = __out.width() > 0 ? __out.width() : 0;
	      _CharT* __pads = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __w));
	      streamsize __len = static_cast<streamsize>(_Traits::length(__s));
	      if (__w > __len)
		{
		  __pad<_CharT, _Traits>::_S_pad(__out, __out.fill(), __pads, 
						 __s, __w, __len, false);
		  __s = __pads;
		  __len = __w;
		}
	      __out.write(__s, __len);
	      __out.width(0);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      __out._M_setstate(ios_base::badbit);
	      if ((__out.exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      else if (!__s)
	__out.setstate(ios_base::badbit);
      return __out;
    }

  template<typename _CharT, typename _Traits>
    basic_ostream<_CharT, _Traits>&
    operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
    {
      typedef basic_ostream<_CharT, _Traits> __ostream_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 167.  Improper use of traits_type::length()
// Note that this is only in 'Review' status.
      typedef char_traits<char>		     __traits_type;
#endif
      typename __ostream_type::sentry __cerb(__out);
      if (__cerb && __s)
	{
	  size_t __clen = __traits_type::length(__s);
	  _CharT* __ws = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * (__clen + 1)));
	  for (size_t  __i = 0; __i < __clen; ++__i)
	    __ws[__i] = __out.widen(__s[__i]);
	  _CharT* __str = __ws;
	  
	  try 
	    {
	      streamsize __len = static_cast<streamsize>(__clen);
	      const streamsize __w = __out.width() > 0 ? __out.width() : 0;
	      _CharT* __pads = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __w));
	      
	      if (__w > __len)
		{
		  __pad<_CharT, _Traits>::_S_pad(__out, __out.fill(), __pads, 
						 __ws, __w, __len, false);
		  __str = __pads;
		  __len = __w;
		}
	      __out.write(__str, __len);
	      __out.width(0);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      __out._M_setstate(ios_base::badbit);
	      if ((__out.exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      else if (!__s)
	__out.setstate(ios_base::badbit);
      return __out;
    }

  // Partial specializations.
  template<class _Traits>
    basic_ostream<char, _Traits>&
    operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
    {
      typedef basic_ostream<char, _Traits> __ostream_type;
      typename __ostream_type::sentry __cerb(__out);
      if (__cerb && __s)
	{
	  try 
	    {
	      const streamsize __w = __out.width() > 0 ? __out.width() : 0;
	      char* __pads = static_cast<char*>(__builtin_alloca(__w));
	      streamsize __len = static_cast<streamsize>(_Traits::length(__s));

	      if (__w > __len)
		{
		  __pad<char, _Traits>::_S_pad(__out, __out.fill(), __pads, 
						 __s, __w, __len, false);
		  __s = __pads;
		  __len = __w;
		}
	      __out.write(__s, __len);
	      __out.width(0);
	    }
	  catch(...)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      __out._M_setstate(ios_base::badbit);
	      if ((__out.exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      else if (!__s)
	__out.setstate(ios_base::badbit);
      return __out;
    }

  // 21.3.7.9 basic_string::operator<<
  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_ostream<_CharT, _Traits>&
    operator<<(basic_ostream<_CharT, _Traits>& __out,
	       const basic_string<_CharT, _Traits, _Alloc>& __str)
    { 
      typedef basic_ostream<_CharT, _Traits> __ostream_type;
      typename __ostream_type::sentry __cerb(__out);
      if (__cerb)
	{
	  const _CharT* __s = __str.data();
	  const streamsize __w = __out.width() > 0 ? __out.width() : 0;
	  _CharT* __pads = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __w));
	  streamsize __len = static_cast<streamsize>(__str.size());
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
	  // 25. String operator<< uses width() value wrong
#endif
	  if (__w > __len)
	    {
	      __pad<_CharT, _Traits>::_S_pad(__out, __out.fill(), __pads, __s, 
					     __w, __len, false);
	      __s = __pads;
	      __len = __w;
	    }
	  streamsize __res = __out.rdbuf()->sputn(__s, __len);
	  __out.width(0);
	  if (__res != __len)
	    __out.setstate(ios_base::failbit);
	}
      return __out;
    }

  // Inhibit implicit instantiations for required instantiations,
  // which are defined via explicit instantiations elsewhere.  
  // NB:  This syntax is a GNU extension.
#if _GLIBCPP_EXTERN_TEMPLATE
  extern template class basic_ostream<char>;
  extern template ostream& endl(ostream&);
  extern template ostream& ends(ostream&);
  extern template ostream& flush(ostream&);
  extern template ostream& operator<<(ostream&, char);
  extern template ostream& operator<<(ostream&, unsigned char);
  extern template ostream& operator<<(ostream&, signed char);
  extern template ostream& operator<<(ostream&, const char*);
  extern template ostream& operator<<(ostream&, const unsigned char*);
  extern template ostream& operator<<(ostream&, const signed char*);

#ifdef _GLIBCPP_USE_WCHAR_T
  extern template class basic_ostream<wchar_t>;
  extern template wostream& endl(wostream&);
  extern template wostream& ends(wostream&);
  extern template wostream& flush(wostream&);
  extern template wostream& operator<<(wostream&, wchar_t);
  extern template wostream& operator<<(wostream&, char);
  extern template wostream& operator<<(wostream&, const wchar_t*);
  extern template wostream& operator<<(wostream&, const char*);
#endif
#endif
} // namespace std