istream.tcc

来自「ARM Linux Tool 各种代码包括MTD」· TCC 代码 · 共 1,240 行 · 第 1/3 页

	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(void*& __n)
    {
      sentry __cerb(*this, false);
      if (__cerb) 
	{
	  try 
	    {
	      ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
	      if (_M_check_facet(_M_fnumget))
		_M_fnumget->get(*this, 0, *this, __err, __n);
	      this->setstate(__err);
	    }
	  catch(exception& __fail)
	    {
	      // 27.6.1.2.1 Common requirements.
	      // Turn this on without causing an ios::failure to be thrown.
	      this->setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>& 
    basic_istream<_CharT, _Traits>::
    operator>>(__streambuf_type* __sbout)
    {
      streamsize __xtrct = 0;
      __streambuf_type* __sbin = this->rdbuf();
      sentry __cerb(*this, false);
      if (__sbout && __cerb)
	__xtrct = __copy_streambufs(*this, __sbin, __sbout);
      if (!__sbout || !__xtrct)
	this->setstate(ios_base::failbit);
      return *this;
    }

  template<typename _CharT, typename _Traits>
    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;
      sentry __cerb(*this, true);
      if (__cerb) 
	{
	  try 
	    {
	      __c = this->rdbuf()->sbumpc();
	      // 27.6.1.1 paragraph 3
	      if (__c != __eof)
		_M_gcount = 1;
	      else
		this->setstate(ios_base::eofbit | ios_base::failbit);
	    }
	  catch(exception& __fail)
	    {
	      // 27.6.1.3 paragraph 1
	      // Turn this on without causing an ios::failure to be thrown.
	      this->setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return __c;
    }

  template<typename _CharT, typename _Traits>
    basic_istream<_CharT, _Traits>&
    basic_istream<_CharT, _Traits>::
    get(char_type& __c)
    {
      _M_gcount = 0;
      sentry __cerb(*this, true);
      if (__cerb) 
	{
 	  try 
	    {
	      const int_type __eof = traits_type::eof();
	      int_type __bufval = this->rdbuf()->sbumpc();
	      // 27.6.1.1 paragraph 3
	      if (__bufval != __eof)
		{
		  _M_gcount = 1;
		  __c = traits_type::to_char_type(__bufval);
		}
	      else
		this->setstate(ios_base::eofbit | ios_base::failbit);
	    }
	  catch(exception& __fail)
	    {
	      // 27.6.1.3 paragraph 1
	      // Turn this on without causing an ios::failure to be thrown.
	      this->setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      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;
      sentry __cerb(*this, true);
      if (__cerb && __n > 1) 
	{
	  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->sbumpc();	
	      bool __testdelim = __c == __idelim;
	      bool __testeof =  __c == __eof;
	      
	      while (_M_gcount < __n - 1 && !__testeof && !__testdelim)
		{
		  *__s++ = traits_type::to_char_type(__c);
		  ++_M_gcount;
		  __c = __sb->sbumpc();
		  __testeof = __c == __eof;
		  __testdelim = __c == __idelim;
		}
	      if (__testdelim || _M_gcount == __n - 1)
		__sb->sputbackc(__c);
	      if (__testeof)
		this->setstate(ios_base::eofbit);
	    }
	  catch(exception& __fail)
	    {
	      // 27.6.1.3 paragraph 1
	      // Turn this on without causing an ios::failure to be thrown.
	      this->setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      *__s = char_type();
      if (!_M_gcount)
	this->setstate(ios_base::failbit);
      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;
      sentry __cerb(*this, true);
      if (__cerb) 
	{
	  int_type __c;
	  __streambuf_type* __this_sb = this->rdbuf();
	  try 
	    {
	      const int_type __idelim = traits_type::to_int_type(__delim);
	      const int_type __eof = traits_type::eof();	      
	      __c = __this_sb->sbumpc();
	      bool __testdelim = __c == __idelim;
	      bool __testeof =  __c == __eof;
	      bool __testput = true;
	      
	      while (!__testeof && !__testdelim 
		    && (__testput = __sb.sputc(traits_type::to_char_type(__c)) 
			 != __eof))
		{
		  ++_M_gcount;
		  __c = __this_sb->sbumpc();
		  __testeof = __c == __eof;
		  __testdelim = __c == __idelim;
		}
	      if (__testdelim || !__testput)
		__this_sb->sputbackc(traits_type::to_char_type(__c));
	      if (__testeof)
		this->setstate(ios_base::eofbit);
	    }
	  catch(exception& __fail)
	    {
	      // Exception may result from sputc->overflow.
	      __this_sb->sputbackc(traits_type::to_char_type(__c));
	    }
	}
      if (!_M_gcount)
	this->setstate(ios_base::failbit);
      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;
      sentry __cerb(*this, true);
      if (__cerb) 
	{
          try 
	    {
	      __streambuf_type* __sb = this->rdbuf();
	      int_type __c = __sb->sbumpc();
	      ++_M_gcount;
	      const int_type __idelim = traits_type::to_int_type(__delim);
	      const int_type __eof = traits_type::eof();
	      bool __testdelim = __c == __idelim;
	      bool __testeof =  __c == __eof;
	    
	      while (_M_gcount < __n && !__testeof && !__testdelim)
		{
		  *__s++ = traits_type::to_char_type(__c);
		  __c = __sb->sbumpc();
		  ++_M_gcount;
		  __testeof = __c == __eof;
		  __testdelim = __c == __idelim;
		}
	      
	      if (__testeof)
		{
		  --_M_gcount;
		  this->setstate(ios_base::eofbit);
		}
	      else if (!__testdelim)
		{
		  --_M_gcount;
		  __sb->sputbackc(traits_type::to_char_type(__c));
		  this->setstate(ios_base::failbit);
		}
	    }
	  catch(exception& __fail)
	    {
	      // 27.6.1.3 paragraph 1
	      // Turn this on without causing an ios::failure to be thrown.
	      this->setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      *__s = char_type();
      if (!_M_gcount)
	this->setstate(ios_base::failbit);
      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) 
	{
	  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->sbumpc();	
	      bool __testdelim = __c == __idelim;
	      bool __testeof =  __c == __eof;
	      
	      __n = min(__n, numeric_limits<streamsize>::max());
	      while (_M_gcount < __n - 1 && !__testeof && !__testdelim)
		{
		  ++_M_gcount;
		  __c = __sb->sbumpc();
		  __testeof = __c == __eof;
		  __testdelim = __c == __idelim;
		}
	      if ((_M_gcount == __n - 1 && !__testeof) || __testdelim)
		++_M_gcount;
	      if (__testeof)
		this->setstate(ios_base::eofbit);
	    }
	  catch(exception& __fail)
	    {
	      // 27.6.1.3 paragraph 1
	      // Turn this on without causing an ios::failure to be thrown.
	      this->setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	}
      return *this;
    }
  
  template<typename _CharT, typename _Traits>
    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)
	{
	  try 
	    { __c = this->rdbuf()->sgetc(); }
	  catch(exception& __fail)
	    {
	      // 27.6.1.3 paragraph 1
	      // Turn this on without causing an ios::failure to be thrown.
	      this->setstate(ios_base::badbit);
	      if ((this->exceptions() & ios_base::badbit) != 0)
		__throw_exception_again;
	    }
	} 
      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) 
	{
	  if (__n > 0)
	    {
	      try 
		{
		  const int_type __eof = traits_type::eof();
		  __streambuf_type* __sb = this->rdbuf();
		  int_type __c = __sb->sbumpc();	
		  bool __testeof =  __c == __eof;
		  
		  while (_M_gcount < __n - 1 && !__testeof)
		    {
		      *__s++ = traits_type::to_char_type(__c);
		      ++_M_gcount;
		      __c = __sb->sbumpc();
		      __testeof = __c == __eof;
		    }
		  if (__testeof)
		    this->setstate(ios_base::eofbit | ios_base::failbit);
		  else
		    {
		      // _M_gcount == __n - 1
		      *__s++ = traits_type::to_char_type(__c);
		      ++_M_gcount;
		    }	    
		}
	      catch(exception& __fail)
		{
		  // 27.6.1.3 paragraph 1
		  // Turn this on without causing an ios::failure to be thrown.
		  this->setstate(ios_base::badbit);
		  if ((this->exceptions() & ios_base::badbit) != 0)
		    __throw_exception_again;
		}
	    }
	}
      else
	this->setstate(ios_base::failbit);
      return *this;
    }
  
  template<typename _CharT, typename _Traits>
    streamsize 
    basic_istream<_CharT, _Traits>::
    readsome(char_type* __s, streamsize __n)
    {
      const int_type __eof = traits_type::eof();
      _M_gcount = 0;
      sentry __cerb(*this, true);
      if (__cerb) 
	{
	  if (__n > 0)
	    {
	      try 
		{
		  streamsize __num = this->rdbuf()->in_avail();
		  if (__num != static_cast<streamsize>(__eof))
		    {
		      __num = min(__num, __n);
		      _M_gcount = this->rdbuf()->sgetn(__s, __num);
		    }
		  else
		    this->setstate(ios_base::eofbit);		    
		}
	      catch(exception& __fail)
		{
		  // 27.6.1.3 paragraph 1
		  // Turn this on without causing an ios::failure to be thrown.
		  this->setstate(ios_base::badbit);
		  if ((this->exceptions() & ios_base::badbit) != 0)
		    __throw_exception_again;
		}
	    }
	}
      else