istream

C标准库源代码

			for (; ; )
				{int_type _C;
				if (_N != INT_MAX && --_N < 0)
					break;
				else if (_Tr::eq_int_type(_Tr::eof(),
					_C = rdbuf()->sbumpc()))
					{_St |= eofbit;
					break; }
				else
					{++_Chcount;
					if (_C == _Di)
						break; }}
			_CATCH_IO_END }
		setstate(_St);
		return (*this); }
	_Myt& read(_E *_S, streamsize _N)
		{iostate _St = goodbit;
		_Chcount = 0;
		const sentry _Ok(*this, true);
		if (_Ok)
			{_TRY_IO_BEGIN
			const streamsize _M = rdbuf()->sgetn(_S, _N);
			_Chcount += _M;
			if (_M != _N)
				_St |= eofbit | failbit;
			_CATCH_IO_END }
		setstate(_St);
		return (*this); }
	streamsize readsome(_E *_S, streamsize _N)
		{iostate _St = goodbit;
		_Chcount = 0;
		int _M;
		if (rdbuf() == 0)
			_St |= failbit;
		else if ((_M = rdbuf()->in_avail()) < 0)
			_St |= eofbit;
		else if (0 < _M)
			read(_S, _M < _N ? _M : _N);
		setstate(_St);
		return (gcount()); }
	int_type peek()
		{iostate _St = goodbit;
		_Chcount = 0;
		int_type _C;
		const sentry _Ok(*this, true);
		if (!_Ok)
			_C = _Tr::eof();
		else
			{_TRY_IO_BEGIN
			if (_Tr::eq_int_type(_Tr::eof(),
				_C = rdbuf()->sgetc()))
				_St |= eofbit;
			_CATCH_IO_END }
		setstate(_St);
		return (_C); }
	_Myt& putback(_E _X)
		{iostate _St = goodbit;
		_Chcount = 0;
		const sentry _Ok(*this, true);
		if (_Ok)
			{_TRY_IO_BEGIN
			if (_Tr::eq_int_type(_Tr::eof(),
				rdbuf()->sputbackc(_X)))
				_St |= badbit;
			_CATCH_IO_END }
		setstate(_St);
		return (*this); }
	_Myt& unget()
		{iostate _St = goodbit;
		_Chcount = 0;
		const sentry _Ok(*this, true);
		if (_Ok)
			{_TRY_IO_BEGIN
			if (_Tr::eq_int_type(_Tr::eof(),
				rdbuf()->sungetc()))
				_St |= badbit;
			_CATCH_IO_END }
		setstate(_St);
		return (*this); }
	streamsize gcount() const
		{return (_Chcount); }
	int sync()
		{iostate _St = goodbit;
		int _Ans;
		if (rdbuf() == 0)
			_Ans = -1;
		else if (rdbuf()->pubsync() == -1)
			_St |= badbit, _Ans = -1;
		else
			_Ans = 0;
		setstate(_St);
		return (_Ans); }
	_Myt& seekg(pos_type _P)
		{if (!fail())
			rdbuf()->pubseekpos(_P, in);
		return (*this); }
	_Myt& seekg(off_type _O, ios_base::seekdir _W)
		{if (!fail())
			rdbuf()->pubseekoff(_O, _W, in);
		return (*this); }
	pos_type tellg()
		{if (!fail())
			return (rdbuf()->pubseekoff(0, cur, in));
		else
			return (streampos(_BADOFF)); }
private:
	streamsize _Chcount;
	};

#ifdef _DLL
#ifdef __FORCE_INSTANCE
template class _CRTIMP2 basic_istream<char, char_traits<char> >;
template class _CRTIMP2 basic_istream<wchar_t, char_traits<wchar_t> >;
#else		// __FORCE_INSTANCE
#pragma warning(disable:4231) /* the extern before template is a non-standard extension */
extern template class _CRTIMP2 basic_istream<char, char_traits<char> >;
extern template class _CRTIMP2 basic_istream<wchar_t, char_traits<wchar_t> >;
#pragma warning(default:4231) /* restore previous warning */
#endif		// __FORCE_INSTANCE
#endif		// _DLL

		// TEMPLATE CLASS basic_iostream
template<class _E, class _Tr = char_traits<_E> >
	class basic_iostream : public basic_istream<_E, _Tr>,
		public basic_ostream<_E, _Tr> {
public:
	explicit basic_iostream(basic_streambuf<_E, _Tr> *_S)
		: basic_istream<_E, _Tr>(_S), basic_ostream<_E, _Tr>(_S, false, false)
		{}
	virtual ~basic_iostream()
		{}
	};

#ifdef _DLL
#ifdef __FORCE_INSTANCE
template class _CRTIMP2 basic_iostream<char, char_traits<char> >;
template class _CRTIMP2 basic_iostream<wchar_t, char_traits<wchar_t> >;
#else		// __FORCE_INSTANCE
#pragma warning(disable:4231) /* the extern before template is a non-standard extension */
extern template class _CRTIMP2 basic_iostream<char, char_traits<char> >;
extern template class _CRTIMP2 basic_iostream<wchar_t, char_traits<wchar_t> >;
#pragma warning(default:4231) /* restore previous warning */
#endif		// __FORCE_INSTANCE
#endif		// _DLL



		// EXTRACTORS
template<class _E, class _Tr> inline
	basic_istream<_E, _Tr>& __cdecl operator>>(
		basic_istream<_E, _Tr>& _I, _E *_X)
	{typedef basic_istream<_E, _Tr> _Myis;
	typedef ctype<_E> _Ctype;
	ios_base::iostate _St = ios_base::goodbit;
	_E *_S = _X;
	const _Myis::sentry _Ok(_I);
	if (_Ok)
		{const _Ctype& _Fac = _USE(_I.getloc(), _Ctype);
		_TRY_IO_BEGIN
		int _N = 0 < _I.width() ? _I.width() : INT_MAX;
		_Myis::int_type _C = _I.rdbuf()->sgetc();
		for (; 0 < --_N; _C = _I.rdbuf()->snextc())
			if (_Tr::eq_int_type(_Tr::eof(), _C))
				{_St |= ios_base::eofbit;
				break; }
			else if (_Fac.is(_Ctype::space,
				_Tr::to_char_type(_C)))
				break;
			else
				*_S++ = _Tr::to_char_type(_C);
		_CATCH_IO_(_I) }
	*_S = _E(0);
	_I.width(0);
	_I.setstate(_S == _X ? _St | ios_base::failbit : _St);
	return (_I); }
template<class _E, class _Tr> inline
	basic_istream<_E, _Tr>& __cdecl operator>>(
		basic_istream<_E, _Tr>& _I, _E& _X)
	{typedef basic_istream<_E, _Tr> _Myis;
	_Myis::int_type _C;
	ios_base::iostate _St = ios_base::goodbit;
	const _Myis::sentry _Ok(_I);
	if (_Ok)
		{_TRY_IO_BEGIN
		_C = _I.rdbuf()->sbumpc();
		if (_Tr::eq_int_type(_Tr::eof(), _C))
			_St |= ios_base::eofbit | ios_base::failbit;
		else
			_X = _Tr::to_char_type(_C);
		_CATCH_IO_(_I) }
	_I.setstate(_St);
	return (_I); }
template<class _E, class _Tr> inline
	basic_istream<_E, _Tr>& __cdecl operator>>(
		basic_istream<_E, _Tr>& _I, signed char *_X)
	{return (_I >> (char *)_X); }
template<class _E, class _Tr> inline
	basic_istream<_E, _Tr>& __cdecl operator>>(
		basic_istream<_E, _Tr>& _I, signed char& _C)
	{return (_I >> (char&)_C); }
template<class _E, class _Tr> inline
	basic_istream<_E, _Tr>& __cdecl operator>>(
		basic_istream<_E, _Tr>& _I, unsigned char *_X)
	{return (_I >> (char *)_X); }
template<class _E, class _Tr> inline
	basic_istream<_E, _Tr>& __cdecl operator>>(
		basic_istream<_E, _Tr>& _I, unsigned char& _C)
	{return (_I >> (char&)_C); }
template<class _E, class _Tr> inline
	basic_istream<_E, _Tr>& __cdecl operator>>(
		basic_istream<_E, _Tr>& _I, signed short * _X)
	{return (_I >> (wchar_t *)_X); }
		// MANIPULATORS
template<class _E, class _Tr> inline
	basic_istream<_E, _Tr>& __cdecl ws(basic_istream<_E, _Tr>& _I)
	{typedef basic_istream<_E, _Tr> _Myis;
	typedef ctype<_E> _Ctype;
	ios_base::iostate _St = ios_base::goodbit;
	const _Myis::sentry _Ok(_I, true);
	if (_Ok)
		{const _Ctype& _Fac = _USE(_I.getloc(), _Ctype);
		_TRY_IO_BEGIN
		for (_Tr::int_type _C = _I.rdbuf()->sgetc(); ;
			_C = _I.rdbuf()->snextc())
			if (_Tr::eq_int_type(_Tr::eof(), _C))
				{_St |= ios_base::eofbit;
				break; }
			else if (!_Fac.is(_Ctype::space,
				_Tr::to_char_type(_C)))
				break;
		_CATCH_IO_(_I) }
	_I.setstate(_St);
	return (_I); }
_CRTIMP2 inline basic_istream<char, char_traits<char> >&
	__cdecl ws(basic_istream<char, char_traits<char> >& _I)
	{typedef char _E;
	typedef char_traits<_E> _Tr;
	ios_base::iostate _St = ios_base::goodbit;
	const basic_istream<_E, _Tr>::sentry _Ok(_I, true);
	if (_Ok)
		{const ctype<_E>& _Fac = _USE(_I.getloc(), ctype<_E>);
		_TRY_IO_BEGIN
		for (_Tr::int_type _C = _I.rdbuf()->sgetc(); ;
			_C = _I.rdbuf()->snextc())
			if (_Tr::eq_int_type(_Tr::eof(), _C))
				{_St |= ios_base::eofbit;
				break; }
			else if (!_Fac.is(ctype<_E>::space,
				_Tr::to_char_type(_C)))
				break;
		_CATCH_IO_(_I) }
	_I.setstate(_St);
	return (_I); }
_CRTIMP2 inline basic_istream<wchar_t, char_traits<wchar_t> >&
	__cdecl ws(basic_istream<wchar_t, char_traits<wchar_t> >& _I)
	{typedef wchar_t _E;
	typedef char_traits<_E> _Tr;
	ios_base::iostate _St = ios_base::goodbit;
	const basic_istream<_E, _Tr>::sentry _Ok(_I, true);
	if (_Ok)
		{const ctype<_E>& _Fac = _USE(_I.getloc(), ctype<_E>);
		_TRY_IO_BEGIN
		for (_Tr::int_type _C = _I.rdbuf()->sgetc(); ;
			_C = _I.rdbuf()->snextc())
			if (_Tr::eq_int_type(_Tr::eof(), _C))
				{_St |= ios_base::eofbit;
				break; }
			else if (_Fac.is(ctype<_E>::space,
				_Tr::to_char_type(_C)))
				break;
		_CATCH_IO_(_I) }
	_I.setstate(_St);
	return (_I); }


#ifdef _DLL
#ifndef CRTDLL2
#pragma warning(disable:4231) /* the extern before template is a non-standard extension */

extern template _CRTIMP2 basic_istream<char, char_traits<char> >& __cdecl operator>>(
       basic_istream<char, char_traits<char> >&, char *);
extern template _CRTIMP2 basic_istream<char, char_traits<char> >& __cdecl operator>>(
       basic_istream<char, char_traits<char> >&, char&);
extern template _CRTIMP2 basic_istream<char, char_traits<char> >& __cdecl operator>>(
       basic_istream<char, char_traits<char> >&, signed char *);
extern template _CRTIMP2 basic_istream<char, char_traits<char> >& __cdecl operator>>(
       basic_istream<char, char_traits<char> >&, signed char&);
extern template _CRTIMP2 basic_istream<char, char_traits<char> >& __cdecl operator>>(
       basic_istream<char, char_traits<char> >&, unsigned char *);
extern template _CRTIMP2 basic_istream<char, char_traits<char> >& __cdecl operator>>(
       basic_istream<char, char_traits<char> >&, unsigned char&);
extern template _CRTIMP2 basic_istream<wchar_t, char_traits<wchar_t> >& __cdecl operator>>(
       basic_istream<wchar_t, char_traits<wchar_t> >&, wchar_t *);
extern template _CRTIMP2 basic_istream<wchar_t, char_traits<wchar_t> >& __cdecl operator>>(
       basic_istream<wchar_t, char_traits<wchar_t> >&, wchar_t&);
extern template _CRTIMP2 basic_istream<wchar_t, char_traits<wchar_t> >& __cdecl operator>>(
       basic_istream<wchar_t, char_traits<wchar_t> >&, signed short *);

#pragma warning(default:4231) /* restore previous warning */
#endif		// CRTDLL2
#endif		// _DLL


_STD_END
#ifdef  _MSC_VER
#pragma pack(pop)
#endif  /* _MSC_VER */

#endif /* _ISTREAM_ */

/*
 * Copyright (c) 1994 by P.J. Plauger.  ALL RIGHTS RESERVED. 
 * Consult your license regarding permissions and restrictions.
 */