windows-nt/Source/XPSP1/NT/base/crts/libw32/include/fstream

// fstream standard header
#pragma once
#ifndef _FSTREAM_
#define _FSTREAM_
#include <istream>

#pragma pack(push,8)
#pragma warning(push,3)

 #pragma warning(disable: 4127)
_STD_BEGIN

extern _CRTIMP2 _Filet *__cdecl _Fiopen(const char *, ios_base::openmode);

		// TEMPLATE FUNCTION _Fgetc
template<class _Elem> inline
	bool _Fgetc(_Elem& _Ch, _Filet *_File)
	{	// get an element from a C stream
	return (fread(&_Ch, sizeof (_Elem), 1, _File) == 1);
	}

template<> inline bool _Fgetc(char& _Byte, _Filet *_File)
	{	// get a char element from a C stream
	int _Meta;
	if ((_Meta = fgetc(_File)) == EOF)
		return (false);
	else
		{	// got one, convert to char
		_Byte = (char)_Meta;
		return (true);
		}
	}

template<> inline bool _Fgetc(wchar_t& _Wchar, _Filet *_File)
	{	// get a wchar_t element from a C stream
	wint_t _Meta;
	if ((_Meta = fgetwc(_File)) == WEOF)
		return (false);
	else
		{	// got one, convert to wchar_t
		_Wchar = (wchar_t)_Meta;
		return (true);
		}
	}

		// TEMPLATE FUNCTION _Fputc
template<class _Elem> inline
	bool _Fputc(_Elem _Ch, _Filet *_File)
	{	// put an element to a C stream
	return (fwrite(&_Ch, sizeof (_Elem), 1, _File) == 1);
	}

template<> inline bool _Fputc(char _Byte, _Filet *_File)
	{	// put a char element to a C stream
	return (fputc(_Byte, _File) != EOF);
	}

template<> inline bool _Fputc(wchar_t _Wchar, _Filet *_File)
	{	// put a wchar_t element to a C stream
	return (fputwc(_Wchar, _File) != WEOF);
	}

		// TEMPLATE FUNCTION _Ungetc
template<class _Elem> inline
	bool _Ungetc(const _Elem& _Ch, _Filet *_File)
	{	// put back an arbitrary element to a C stream (always fail)
	return (false);
	}

template<> inline bool _Ungetc(const char& _Byte, _Filet *_File)
	{	// put back a char element to a C stream
	return (ungetc((unsigned char)_Byte, _File) != EOF);
	}

template<> inline bool _Ungetc(const signed char& _Byte, _Filet *_File)
	{	// put back a signed char element to a C stream
	return (ungetc((unsigned char)_Byte, _File) != EOF);
	}

template<> inline bool _Ungetc(const unsigned char& _Byte, _Filet *_File)
	{	// put back an unsigned char element to a C stream
	return (ungetc(_Byte, _File) != EOF);
	}

template<> inline bool _Ungetc(const wchar_t& _Wchar, _Filet *_File)
	{	// put back a wchar_t element to a C stream
	return (ungetwc(_Wchar, _File) != WEOF);
	}

		// TEMPLATE CLASS basic_filebuf
template<class _Elem,
	class _Traits>
	class basic_filebuf
		: public basic_streambuf<_Elem, _Traits>
	{	// stream buffer associated with a C stream
public:
	typedef basic_filebuf<_Elem, _Traits> _Myt;
	typedef basic_streambuf<_Elem, _Traits> _Mysb;
	typedef codecvt<_Elem, char, typename _Traits::state_type> _Cvt;

	virtual ~basic_filebuf()
		{	// destroy the object
		if (_Closef)
			close();
		_DELETE_CRT(_Mystr);
		}

	basic_filebuf(_Filet *_File = 0)
		: _Mysb(), _Mystr(0), _Loc()
		{	// construct from pointer to C stream
		_Init(_File, _Newfl);
		}

	typedef typename _Traits::int_type int_type;
	typedef typename _Traits::pos_type pos_type;
	typedef typename _Traits::off_type off_type;

	basic_filebuf(_Uninitialized)
		: _Mysb(_Noinit), _Loc(_Noinit)
		{	// construct uninitialized
		}

	enum _Initfl
		{	// reasons for a call to _Init
		_Newfl, _Openfl, _Closefl};

	bool is_open() const
		{	// test if C stream has been opened
		return (_Myfile != 0);
		}

	_Myt *open(const char *_Filename, ios_base::openmode _Mode)
		{	// open a C stream with specified mode
		_Filet *_File;
		if (_Myfile != 0 || (_File = _Fiopen(_Filename, _Mode)) == 0)
			return (0);	// open failed

		_Init(_File, _Openfl);
		_Initcvt((_Cvt *)&_USE(_Mysb::getloc(), _Cvt));
		return (this);	// open succeeded
		}

	_Myt *open(const char *_Filename, ios_base::open_mode _Mode)
		{	// open a C stream with specified mode (old style)
		return (open(_Filename, (ios_base::openmode)_Mode));
		}

	_Myt *close()
		{	// close the C stream
		if (_Myfile != 0 && _Endwrite() && fclose(_Myfile) == 0)
			{	// close succeeded, tidy up
			_Init(0, _Closefl);
			return (this);
			}
		else
			return (0);
		}

protected:
	virtual int_type overflow(int_type _Meta = _Traits::eof())
		{	// put an element to stream
		if (_Traits::eq_int_type(_Traits::eof(), _Meta))
			return (_Traits::not_eof(_Meta));	// EOF, return success code
		else if (_Mysb::pptr() != 0
			&& _Mysb::pptr() < _Mysb::epptr())
			{	// room in buffer, store it
			*_Mysb::_Pninc() = _Traits::to_char_type(_Meta);
			return (_Meta);
			}
		else if (_Myfile == 0)
			return (_Traits::eof());	// no open C stream, fail
		else if (_Pcvt == 0)
			return (_Fputc(_Traits::to_char_type(_Meta), _Myfile)
				? _Meta : _Traits::eof());	// no codecvt facet, put as is
		else
			{	// put using codecvt facet
			const int _STRING_INC = 8;
			const _Elem _Ch = _Traits::to_char_type(_Meta);
			const _Elem *_Source;
			char *_Dest;

			_Mystr->erase();
			string _Str(_STRING_INC, '\0');
			for (; ; )
				switch (_Pcvt->out(_State,
					&_Ch, &_Ch + 1, _Source,
					&*_Str.begin(), &*_Str.end(), _Dest))
				{	// test result of converting one element
				case codecvt_base::partial:
				case codecvt_base::ok:
					{	// converted something, try to put it out
					size_t _Count = _Dest - &*_Str.begin();
					if (0 < _Count && _Count !=
						fwrite(&*_Str.begin(), 1, _Count, _Myfile))
						return (_Traits::eof());	// write failed

					_Wrotesome = true;	// write succeeded
					if (_Source != &_Ch)
						return (_Meta);	// converted whole element
					if (_Count == 0)
						_Str.append(_STRING_INC, '\0');	// try some more
					break;
					}

				case codecvt_base::noconv:
					return (_Fputc(_Ch, _Myfile) ? _Meta
						: _Traits::eof());	// no conversion, put as is

				default:
					return (_Traits::eof());	// conversion failed
				}
			}
		}

	virtual int_type pbackfail(int_type _Meta = _Traits::eof())
		{	// put an element back to stream
		if (_Mysb::gptr() != 0
			&& _Mysb::eback() < _Mysb::gptr()
			&& (_Traits::eq_int_type(_Traits::eof(), _Meta)
			|| _Traits::eq_int_type(_Traits::to_int_type(_Mysb::gptr()[-1]),
				_Meta)))
			{	// just back up position
			_Mysb::_Gndec();
			return (_Traits::not_eof(_Meta));
			}
		else if (_Myfile == 0 || _Traits::eq_int_type(_Traits::eof(), _Meta))
			return (_Traits::eof());	// no open C stream or EOF, fail
		else if (_Pcvt == 0 && _Ungetc(_Traits::to_char_type(_Meta), _Myfile))
			return (_Meta);	// no facet and unget succeeded, return
		else
			{	// putback to _Mychar
			_Mychar = _Traits::to_char_type(_Meta);
			_Mysb::setg(&_Mychar, &_Mychar, &_Mychar + 1);
			return (_Meta);
			}
		}

	virtual int_type underflow()
		{	// get an element from stream, but don't point past it
		int_type _Meta;
		if (_Mysb::gptr() != 0
			&& _Mysb::gptr() < _Mysb::egptr())
			return (_Traits::to_int_type(*_Mysb::gptr()));	// return buffered
		else if (_Traits::eq_int_type(_Traits::eof(), _Meta = uflow()))
			return (_Meta);	// uflow failed, return EOF
		else
			{	// get a char, don't point past it
			pbackfail(_Meta);
			return (_Meta);
			}
		}

	virtual int_type uflow()
		{	// get an element from stream, point past it
		if (_Mysb::gptr() != 0
			&& _Mysb::gptr() < _Mysb::egptr())
			return (_Traits::to_int_type(
				*_Mysb::_Gninc()));	// return buffered
		else if (_Myfile == 0)
			return (_Traits::eof());	// no open C stream, fail
		else if (_Pcvt == 0)
			{	// no codecvt facet, just get it
			_Elem _Ch = 0;
			return (_Fgetc(_Ch, _Myfile) ? _Traits::to_int_type(_Ch)
				: _Traits::eof());
			}
		else
			for (_State0 = _State, _Mystr->erase(); ; )
				{	// get using codecvt facet
				_Elem _Ch, *_Dest;
				const char *_Source;
				int _Meta = fgetc(_Myfile);

				if (_Meta == EOF)
					return (_Traits::eof());	// partial char?

				_Mystr->append(1, (char)_Meta);	// append byte and convert
				_State = _State0;
				switch (_Pcvt->in(_State,
					&*_Mystr->begin(), &*_Mystr->end(), _Source,
					&_Ch, &_Ch + 1, _Dest))
				{	// test result of converting one element
				case codecvt_base::partial:
					break;	// partial, not done yet

				case codecvt_base::noconv:
					if (_Mystr->size() < sizeof (_Elem))
						break;	// no conversion, but need more chars

					memcpy(&_Ch, &*_Mystr->begin(),
						sizeof (_Elem));	// copy raw bytes to element

				case codecvt_base::ok:	// can fall through
					return (_Traits::to_int_type(_Ch));	// return result

				default:
					return (_Traits::eof());	// conversion failed
				}
				}
		}

	virtual pos_type seekoff(off_type _Off, ios_base::seekdir _Way,
		ios_base::openmode =
			(ios_base::openmode)(ios_base::in | ios_base::out))
		{	// change position by _Off
		fpos_t _Fileposition;

		if (_Mysb::gptr() != &_Mychar
			|| _Mysb::egptr() <= _Mysb::gptr()
			|| _Way != ios_base::cur)
			;	// don't have to worry about putback character
		else if (_Pcvt == 0)
			_Off -= (off_type)sizeof (_Elem);	// back up over _Elem bytes
		else
			{	// back up over converted bytes
			_Off -= (off_type)_Mystr->size();
			_Mystr->erase();
			_State = _State0;
			}
		if (_Myfile == 0 || !_Endwrite()
			|| (_Off != 0 || _Way != ios_base::cur)
				&& fseek(_Myfile, (long)_Off, _Way) != 0
			|| fgetpos(_Myfile, &_Fileposition) != 0)
			return (pos_type(_BADOFF));	// report failure
		if (_Mysb::gptr() == &_Mychar)
			_Mysb::setg(&_Mychar, &_Mychar, &_Mychar);	// discard putback
		return (pos_type(_State, _Fileposition));	// return new position
		}

	virtual pos_type seekpos(pos_type _Pos,
		ios_base::openmode =
			(ios_base::openmode)(ios_base::in | ios_base::out))
		{	// change position to _Pos
		fpos_t _Fileposition = _Pos.seekpos();
		off_type _Off = (off_type)_Pos - _FPOSOFF(_Fileposition);

		if (_Myfile == 0 || !_Endwrite()
			|| fsetpos(_Myfile, &_Fileposition) != 0
			|| _Off != 0 && fseek(_Myfile, (long)_Off, SEEK_CUR) != 0
			|| fgetpos(_Myfile, &_Fileposition) != 0)
			return (pos_type(_BADOFF));	// report failure
		if (_Mystr != 0)
			_State = _Pos.state(), _Mystr->erase();	// restore state
		if (_Mysb::gptr() == &_Mychar)
			_Mysb::setg(&_Mychar, &_Mychar, &_Mychar);	// discard putback
		return (pos_type(_State, _Fileposition));	// return new position
		}

	virtual _Mysb *setbuf(_Elem *_Buffer, streamsize _Count)
		{	// offer _Buffer to C stream
		return (_Myfile == 0 || setvbuf(_Myfile, (char *)_Buffer,
			_Buffer == 0 && _Count == 0 ? _IONBF : _IOFBF,
			_Count * sizeof (_Elem)) != 0 ? 0 : this);
		}

	virtual int sync()
		{	// synchronize C stream with external file
		return (_Myfile == 0
			|| _Traits::eq_int_type(_Traits::eof(), overflow())
			|| 0 <= fflush(_Myfile) ? 0 : -1);
		}

	virtual void imbue(const locale& _Loc)
		{	// set locale to argument (capture nontrivial codecvt facet)
		_Initcvt((_Cvt *)&_USE(_Loc, _Cvt));
		}

	void _Init(_Filet *_File, _Initfl _Which)
		{	// initialize to C stream _File after {new, open, close}
		static typename _Traits::state_type _Stinit;	// initial state
		_Closef = _Which == _Openfl;
		_Wrotesome = false;

		_Mysb::_Init();	// initialize stream buffer base object

 #ifndef _IORCNT
  #define _IORCNT	_IOCNT	/* read and write counts are the same */
  #define _IOWCNT _IOCNT
 #endif
		if (_File != 0 && sizeof (_Elem) == 1)
			{	// point inside C stream with [first, first + count) buffer
			_Elem **_Pb = (_Elem **)&_File->_IOBASE;
			_Elem **_Pn = (_Elem **)&_File->_IOPTR;
			int *_Nr = (int *)&_File->_IORCNT;
			int *_Nw = (int *)&_File->_IOWCNT;
			_Mysb::_Init(_Pb, _Pn, _Nr, _Pb, _Pn, _Nw);
			}
		_Myfile = _File;
		_State = _Stinit;
		_State0 = _Stinit;
		_Pcvt = 0;	// pointer to codecvt facet
		}

	bool _Endwrite()
		{	// put shift to initial conversion state, as needed
		if (_Pcvt == 0 || !_Wrotesome)
			return (true);
		else
			{	// may have to put
			const int _STRING_INC = 8;
			char *_Dest;
			overflow();

			string _Str(_STRING_INC, '\0');
			for (; ; )
				switch (_Pcvt->unshift(_State,
					&*_Str.begin(), &*_Str.end(), _Dest))
				{	// test result of homing conversion
				case codecvt_base::ok:
					_Wrotesome = false;	// homed successfully

				case codecvt_base::partial:	// can fall through
					{	// put any generated bytes
					size_t _Count = _Dest - &*_Str.begin();
					if (0 < _Count && _Count !=
						fwrite(&*_Str.begin(), _Count, 1, _Myfile))
						return (false);	// write failed
					if (!_Wrotesome)
						return (true);
					_Str.append(_STRING_INC, '\0');	// try some more
					break;
					}

				case codecvt_base::noconv:
					return (true);	// nothing to do

				default:
					return (false);	// conversion failed
				}
			}
		}

	void _Initcvt(_Cvt *_Newpcvt)
		{	// initialize codecvt pointer
		if (_Newpcvt->always_noconv())
			_Pcvt = 0;	// nothing to do
		else
			{	// set up for nontrivial codecvt facet
			_Pcvt = _Newpcvt;
			_Loc = _ADDFAC(_Loc, _Pcvt);	// to keep facet alive
			_Mysb::_Init();	// reset any buffering
			if (_Mystr == 0)
				_Mystr = _NEW_CRT _STRING_CRT;	// buy conversion buffer
			}
		}

private:
	_Cvt *_Pcvt;	// pointer to codecvt facet (may be null)
	typename _Traits::state_type _State0;	// rollback for bad conversion
	_Elem _Mychar;	// putback character, when _Ungetc fails
	_STRING_CRT *_Mystr;	// string to hold partial conversion byte sequences
	bool _Wrotesome;	// true if homing sequence may be needed
	typename _Traits::state_type _State;	// current conversion state
	bool _Closef;	// true if C stream must be closed
	locale _Loc;	// locale object to hold codecvt facet
	_Filet *_Myfile;	// pointer to C stream
	};


 #ifdef _DLL_CPPLIB
template class _CRTIMP2 basic_filebuf<char,
	char_traits<char> >;
template class _CRTIMP2 basic_filebuf<wchar_t,
	char_traits<wchar_t> >;
 #endif	// _DLL_CPPLIB

		// TEMPLATE CLASS basic_ifstream
template<class _Elem,
	class _Traits>
	class basic_ifstream
		: public basic_istream<_Elem, _Traits>
	{	// input stream associated with a C stream
public:
	typedef basic_ifstream<_Elem, _Traits> _Myt;
	typedef basic_filebuf<_Elem, _Traits> _Myfb;
	typedef basic_ios<_Elem, _Traits> _Myios;

	basic_ifstream()
		: basic_istream<_Elem, _Traits>(&_Filebuffer)
		{	// construct unopened
		}

	explicit basic_ifstream(const char *_Filename,
		ios_base::openmode _Mode = ios_base::in)
		: basic_istream<_Elem, _Traits>(&_Filebuffer)
		{	// construct with named file and specified mode
		if (_Filebuffer.open(_Filename, _Mode | ios_base::in) == 0)
			_Myios::setstate(ios_base::failbit);
		}

	virtual ~basic_ifstream()
		{	// destroy the object
		}

	_Myfb *rdbuf() const
		{	// return pointer to file buffer
		return ((_Myfb *)&_Filebuffer);
		}

	bool is_open() const
		{	// test if C stream has been opened
		return (_Filebuffer.is_open());
		}

	void open(const char *_Filename,
		ios_base::openmode _Mode = ios_base::in)
		{	// open a C stream with specified mode
		if (_Filebuffer.open(_Filename, _Mode | ios_base::in) == 0)
			_Myios::setstate(ios_base::failbit);
		}

	void open(const char *_Filename, ios_base::open_mode _Mode)
		{	// open named file with specified mode (old style)
		open(_Filename, (ios_base::openmode)_Mode);
		}

	void close()
		{	// close the C stream
		if (_Filebuffer.close() == 0)
			_Myios::setstate(ios_base::failbit);
		}

private:
	_Myfb _Filebuffer;	// the file buffer
	};

 #ifdef _DLL_CPPLIB
template class _CRTIMP2 basic_ifstream<char,
	char_traits<char> >;
template class _CRTIMP2 basic_ifstream<wchar_t,
	char_traits<wchar_t> >;
 #endif	// _DLL_CPPLIB

		// TEMPLATE CLASS basic_ofstream
template<class _Elem,
	class _Traits>
	class basic_ofstream
		: public basic_ostream<_Elem, _Traits>
	{	// output stream associated with a C stream
public:
	typedef basic_ofstream<_Elem, _Traits> _Myt;
	typedef basic_filebuf<_Elem, _Traits> _Myfb;
	typedef basic_ios<_Elem, _Traits> _Myios;

	basic_ofstream()
		: basic_ostream<_Elem, _Traits>(&_Filebuffer)
		{	// construct unopened
		}

	explicit basic_ofstream(const char *_Filename,
		ios_base::openmode _Mode = ios_base::out)
		: basic_ostream<_Elem, _Traits>(&_Filebuffer)
		{	// construct with named file and specified mode
		if (_Filebuffer.open(_Filename, _Mode | ios_base::out) == 0)
			_Myios::setstate(ios_base::failbit);
		}

	virtual ~basic_ofstream()
		{	// destroy the object
		}

	_Myfb *rdbuf() const
		{	// return pointer to file buffer
		return ((_Myfb *)&_Filebuffer);
		}

	bool is_open() const
		{	// test if C stream has been opened
		return (_Filebuffer.is_open());
		}

	void open(const char *_Filename,
		ios_base::openmode _Mode = ios_base::out)
		{	// open a C stream with specified mode
		if (_Filebuffer.open(_Filename, _Mode | ios_base::out) == 0)
			_Myios::setstate(ios_base::failbit);
		}

	void open(const char *_Filename, ios_base::open_mode _Mode)
		{	// open a C stream with specified mode (old style)
		open(_Filename, (ios_base::openmode)_Mode);
		}

	void close()
		{	// close the C stream
		if (_Filebuffer.close() == 0)
			_Myios::setstate(ios_base::failbit);
		}

private:
	_Myfb _Filebuffer;	// the file buffer
	};

 #ifdef _DLL_CPPLIB
template class _CRTIMP2 basic_ofstream<char,
	char_traits<char> >;
template class _CRTIMP2 basic_ofstream<wchar_t,
	char_traits<wchar_t> >;
 #endif	// _DLL_CPPLIB

		// TEMPLATE CLASS basic_fstream
template<class _Elem,
	class _Traits>
	class basic_fstream
		: public basic_iostream<_Elem, _Traits>
	{	// input/output stream associated with a C stream
public:
	typedef basic_ios<_Elem, _Traits> _Myios;
	typedef _Elem char_type;
	typedef _Traits traits_type;
	typedef typename _Traits::int_type int_type;
	typedef typename _Traits::pos_type pos_type;
	typedef typename _Traits::off_type off_type;

	basic_fstream()
		: basic_iostream<_Elem, _Traits>(&_Filebuffer)
		{	// construct unopened
		}

	explicit basic_fstream(const char *_Filename,
		ios_base::openmode _Mode = ios_base::in | ios_base::out)
		: basic_iostream<_Elem, _Traits>(&_Filebuffer)
		{	// construct with named file and specified mode
		if (_Filebuffer.open(_Filename, _Mode) == 0)
			_Myios::setstate(ios_base::failbit);
		}

	virtual ~basic_fstream()
		{	// destroy the object
		}

	basic_filebuf<_Elem, _Traits> *rdbuf() const
		{	// return pointer to file buffer
		return ((basic_filebuf<_Elem, _Traits> *)&_Filebuffer);
		}

	bool is_open() const
		{	// test if C stream has been opened
		return (_Filebuffer.is_open());
		}

	void open(const char *_Filename,
		ios_base::openmode _Mode = ios_base::in | ios_base::out)
		{	// open a C stream with specified mode
		if (_Filebuffer.open(_Filename, _Mode) == 0)
			_Myios::setstate(ios_base::failbit);
		}

	void open(const char *_Filename, ios_base::open_mode _Mode)
		{	// open a C stream with specified mode (old style)
		open(_Filename, (ios_base::openmode)_Mode);
		}

	void close()
		{	// close the C stream
		if (_Filebuffer.close() == 0)
			_Myios::setstate(ios_base::failbit);
		}

private:
	basic_filebuf<_Elem, _Traits> _Filebuffer;	// the file buffer
	};

 #ifdef _DLL_CPPLIB
template class _CRTIMP2 basic_fstream<char,
	char_traits<char> >;
template class _CRTIMP2 basic_fstream<wchar_t,
	char_traits<wchar_t> >;
 #endif	// _DLL_CPPLIB
_STD_END

  #pragma warning(default: 4127)
#pragma warning(pop)
#pragma pack(pop)

#endif /* _FSTREAM_ */

/*
* Copyright (c) 1992-2001 by P.J. Plauger.  ALL RIGHTS RESERVED.
 * Consult your license regarding permissions and restrictions.
 V3.10:0009 */