istream.tcc

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		__err |= ios_base::failbit;
	    }
	  catch(...)
	    { this->_M_setstate(ios_base::failbit); }
	}
      else if (!__sbout)
	__err |= ios_base::failbit;
      if (__err)
	this->setstate(__err);
      return *this;
    }

  template<typename _CharT, typename _Traits>
    typename basic_istream<_CharT, _Traits>::int_type
    basic_istream<_CharT, _Traits>::
    get(void)
    {
      const int_type __eof = traits_type::eof();
      int_type __c = __eof;
      _M_gcount = 0;
      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
      sentry __cerb(*this, true);
      if (__cerb)
	{
	  try
	    {
	      __c = this->rdbuf()->sbumpc();
	      // 27.6.1.1 paragraph 3
	      if (!traits_type::eq_int_type(__c, __eof))
		_M_gcount = 1;
	      else
		__err |= ios_base::eofbit;
	    }
	  catch(...)
	    { this->_M_setstate(ios_base::badbit); }
	}
      if (!_M_gcount)
	__err |= ios_base::failbit;
      if (__err)
	this->setstate(__err);
      return __c;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>&
    basic_istream<_CharT, _Traits>::
    get(char_type& __c)
    {
      _M_gcount = 0;
      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
      sentry __cerb(*this, true);
      if (__cerb)
	{
	  try
	    {
	      const int_type __cb = this->rdbuf()->sbumpc();
	      // 27.6.1.1 paragraph 3
	      if (!traits_type::eq_int_type(__cb, traits_type::eof()))
		{
		  _M_gcount = 1;
		  __c = traits_type::to_char_type(__cb);
		}
	      else
		__err |= ios_base::eofbit;
	    }
	  catch(...)
	    { this->_M_setstate(ios_base::badbit); }
	}
      if (!_M_gcount)
	__err |= ios_base::failbit;
      if (__err)
	this->setstate(__err);
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>&
    basic_istream<_CharT, _Traits>::
    get(char_type* __s, streamsize __n, char_type __delim)
    {
      _M_gcount = 0;
      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
      sentry __cerb(*this, true);
      if (__cerb)
	{
	  try
	    {
	      const int_type __idelim = traits_type::to_int_type(__delim);
	      const int_type __eof = traits_type::eof();
	      __streambuf_type* __sb = this->rdbuf();
	      int_type __c = __sb->sgetc();

	      while (_M_gcount + 1 < __n
		     && !traits_type::eq_int_type(__c, __eof)
		     && !traits_type::eq_int_type(__c, __idelim))
		{
		  *__s++ = traits_type::to_char_type(__c);
		  ++_M_gcount;
		  __c = __sb->snextc();
		}
	      if (traits_type::eq_int_type(__c, __eof))
		__err |= ios_base::eofbit;
	    }
	  catch(...)
	    { this->_M_setstate(ios_base::badbit); }
	}
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 243. get and getline when sentry reports failure.
      if (__n > 0)
	*__s = char_type();
      if (!_M_gcount)
	__err |= ios_base::failbit;
      if (__err)
	this->setstate(__err);
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>&
    basic_istream<_CharT, _Traits>::
    get(__streambuf_type& __sb, char_type __delim)
    {
      _M_gcount = 0;
      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
      sentry __cerb(*this, true);
      if (__cerb)
	{
	  try
	    {
	      const int_type __idelim = traits_type::to_int_type(__delim);
	      const int_type __eof = traits_type::eof();
	      __streambuf_type* __this_sb = this->rdbuf();
	      int_type __c = __this_sb->sgetc();
	      char_type __c2 = traits_type::to_char_type(__c);

	      while (!traits_type::eq_int_type(__c, __eof)
		     && !traits_type::eq_int_type(__c, __idelim)
		     && !traits_type::eq_int_type(__sb.sputc(__c2), __eof))
		{
		  ++_M_gcount;
		  __c = __this_sb->snextc();
		  __c2 = traits_type::to_char_type(__c);
		}
	      if (traits_type::eq_int_type(__c, __eof))
		__err |= ios_base::eofbit;
	    }
	  catch(...)
	    { this->_M_setstate(ios_base::badbit); }
	}
      if (!_M_gcount)
	__err |= ios_base::failbit;
      if (__err)
	this->setstate(__err);
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>&
    basic_istream<_CharT, _Traits>::
    getline(char_type* __s, streamsize __n, char_type __delim)
    {
      _M_gcount = 0;
      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
      sentry __cerb(*this, true);
      if (__cerb)
        {
          try
            {
              const int_type __idelim = traits_type::to_int_type(__delim);
              const int_type __eof = traits_type::eof();
              __streambuf_type* __sb = this->rdbuf();
              int_type __c = __sb->sgetc();

              while (_M_gcount + 1 < __n
                     && !traits_type::eq_int_type(__c, __eof)
                     && !traits_type::eq_int_type(__c, __idelim))
                {
                  *__s++ = traits_type::to_char_type(__c);
                  __c = __sb->snextc();
                  ++_M_gcount;
                }
              if (traits_type::eq_int_type(__c, __eof))
                __err |= ios_base::eofbit;
              else
                {
                  if (traits_type::eq_int_type(__c, __idelim))
                    {
                      __sb->sbumpc();
                      ++_M_gcount;
                    }
                  else
                    __err |= ios_base::failbit;
                }
            }
          catch(...)
            { this->_M_setstate(ios_base::badbit); }
        }
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 243. get and getline when sentry reports failure.
      if (__n > 0)
	*__s = char_type();
      if (!_M_gcount)
        __err |= ios_base::failbit;
      if (__err)
        this->setstate(__err);
      return *this;
    }

  // We provide three overloads, since the first two are much simpler
  // than the general case. Also, the latter two can thus adopt the
  // same "batchy" strategy used by getline above.
  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>&
    basic_istream<_CharT, _Traits>::
    ignore(void)
    {
      _M_gcount = 0;
      sentry __cerb(*this, true);
      if (__cerb)
	{
	  ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	  try
	    {
	      const int_type __eof = traits_type::eof();
	      __streambuf_type* __sb = this->rdbuf();

	      if (traits_type::eq_int_type(__sb->sbumpc(), __eof))
		__err |= ios_base::eofbit;
	      else
		_M_gcount = 1;
	    }
	  catch(...)
	    { this->_M_setstate(ios_base::badbit); }
	  if (__err)
	    this->setstate(__err);
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>&
    basic_istream<_CharT, _Traits>::
    ignore(streamsize __n)
    {
      _M_gcount = 0;
      sentry __cerb(*this, true);
      if (__cerb && __n > 0)
        {
          ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
          try
            {
              const int_type __eof = traits_type::eof();
              __streambuf_type* __sb = this->rdbuf();
              int_type __c = __sb->sgetc();

	      // N.B. On LFS-enabled platforms streamsize is still 32 bits
	      // wide: if we want to implement the standard mandated behavior
	      // for n == max() (see 27.6.1.3/24) we are at risk of signed
	      // integer overflow: thus these contortions. Also note that,
	      // by definition, when more than 2G chars are actually ignored,
	      // _M_gcount (the return value of gcount, that is) cannot be
	      // really correct, being unavoidably too small.
	      bool __large_ignore = false;
	      while (true)
		{
		  while (_M_gcount < __n
			 && !traits_type::eq_int_type(__c, __eof))
		    {
		      ++_M_gcount;
		      __c = __sb->snextc();
		    }
		  if (__n == numeric_limits<streamsize>::max()
		      && !traits_type::eq_int_type(__c, __eof))
		    {
		      _M_gcount = numeric_limits<streamsize>::min();
		      __large_ignore = true;
		    }
		  else
		    break;
		}

	      if (__large_ignore)
		_M_gcount = numeric_limits<streamsize>::max();

	      if (traits_type::eq_int_type(__c, __eof))
                __err |= ios_base::eofbit;
            }
          catch(...)
            { this->_M_setstate(ios_base::badbit); }
          if (__err)
            this->setstate(__err);
        }
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>&
    basic_istream<_CharT, _Traits>::
    ignore(streamsize __n, int_type __delim)
    {
      _M_gcount = 0;
      sentry __cerb(*this, true);
      if (__cerb && __n > 0)
        {
          ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
          try
            {
              const int_type __eof = traits_type::eof();
              __streambuf_type* __sb = this->rdbuf();
              int_type __c = __sb->sgetc();

	      // See comment above.
	      bool __large_ignore = false;
	      while (true)
		{
		  while (_M_gcount < __n
			 && !traits_type::eq_int_type(__c, __eof)
			 && !traits_type::eq_int_type(__c, __delim))
		    {
		      ++_M_gcount;
		      __c = __sb->snextc();
		    }
		  if (__n == numeric_limits<streamsize>::max()
		      && !traits_type::eq_int_type(__c, __eof)
		      && !traits_type::eq_int_type(__c, __delim))
		    {
		      _M_gcount = numeric_limits<streamsize>::min();
		      __large_ignore = true;
		    }
		  else
		    break;
		}

	      if (__large_ignore)
		_M_gcount = numeric_limits<streamsize>::max();

              if (traits_type::eq_int_type(__c, __eof))
                __err |= ios_base::eofbit;
	      else if (traits_type::eq_int_type(__c, __delim))
		{
		  if (_M_gcount < numeric_limits<streamsize>::max())
		    ++_M_gcount;
		  __sb->sbumpc();
		}
            }
          catch(...)
            { this->_M_setstate(ios_base::badbit); }
          if (__err)
            this->setstate(__err);
        }
      return *this;
    }

  template<typename _CharT, typename _Traits>
    typename basic_istream<_CharT, _Traits>::int_type
    basic_istream<_CharT, _Traits>::
    peek(void)
    {
      int_type __c = traits_type::eof();
      _M_gcount = 0;
      sentry __cerb(*this, true);
      if (__cerb)
	{
	  ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	  try
	    {
	      __c = this->rdbuf()->sgetc();
	      if (traits_type::eq_int_type(__c, traits_type::eof()))
		__err |= ios_base::eofbit;
	    }
	  catch(...)
	    { this->_M_setstate(ios_base::badbit); }
	  if (__err)
	    this->setstate(__err);
	}
      return __c;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>&
    basic_istream<_CharT, _Traits>::
    read(char_type* __s, streamsize __n)
    {
      _M_gcount = 0;
      sentry __cerb(*this, true);
      if (__cerb)
	{
	  ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	  try
	    {
	      _M_gcount = this->rdbuf()->sgetn(__s, __n);
	      if (_M_gcount != __n)
		__err |= (ios_base::eofbit | ios_base::failbit);
	    }
	  catch(...)
	    { this->_M_setstate(ios_base::badbit); }
	  if (__err)
	    this->setstate(__err);
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    streamsize
    basic_istream<_CharT, _Traits>::
    readsome(char_type* __s, streamsize __n)
    {
      _M_gcount = 0;
      sentry __cerb(*this, true);
      if (__cerb)
	{
	  ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	  try
	    {
	      // Cannot compare int_type with streamsize generically.
	      const streamsize __num = this->rdbuf()->in_avail();
	      if (__num > 0)
		_M_gcount = this->rdbuf()->sgetn(__s, std::min(__num, __n));
	      else if (__num == -1)
		__err |= ios_base::eofbit;
	    }
	  catch(...)
	    { this->_M_setstate(ios_base::badbit); }
	  if (__err)
	    this->setstate(__err);
	}
      return _M_gcount;
    }