fstream.h

tc3.0,turbo c开发平台（turb0 c 3.0）kaifapingtai

/* fstream.h -- class filebuf and fstream declarations

    Copyright (c) 1990 by Borland International    
	All rights reserved
*/

#ifndef __FSTREAM_H
#define __FSTREAM_H

#include <iostream.h>

#if __STDC__
#define _Cdecl
#else
#define _Cdecl	cdecl
#endif

class  filebuf : public streambuf {
public:
static const int openprot;	// default file protection

		// constructors, destructor
		_Cdecl filebuf();	// make a closed filebuf
		_Cdecl filebuf(int);	// make a filebuf attached to fd
		_Cdecl filebuf(int _f, char*, int); // same, with specified buffer
		_Cdecl ~filebuf();

	int	_Cdecl is_open();	// is the file open
	int	_Cdecl fd();		// what is the file descriptor

	// open named file with mode and protection, attach to this filebuf
	filebuf* _Cdecl open(const char*, int, int = filebuf::openprot);

	filebuf* _Cdecl close();	// flush and close file
	filebuf* _Cdecl attach(int);	// attach this filebuf to opened file descriptor

/*
 * These perform the streambuf functions on a filebuf
 * Get and Put pointers are kept together
 */
virtual int	_Cdecl overflow(int = EOF);
virtual int	_Cdecl underflow();
virtual int	_Cdecl sync();
virtual streampos  _Cdecl seekoff(streamoff, seek_dir, int);
virtual streambuf* _Cdecl setbuf(char*, int);

protected:
	int	xfd;		// the file descriptor, EOF if closed
	int	mode;		// the opened mode
	short	opened;	// non-zero if file is open

	streampos last_seek;	// unused			***
	char*   in_start;	    // unused			***

	int	_Cdecl last_op();	// unused			***
	char	lahead[2];	    // current input char if unbuffered ***
};
/*
 * The data members marked with *** above are not documented in the AT&T
 * release of streams, so we cannot guarantee compatibility with any
 * other streams release in the use or values of these data members.
 * If you can document any expected behavior of these data members, we
 * will try to adjust our implementation accordingly.
 */
inline int	_Cdecl filebuf::is_open()	{ return opened; }
inline int	_Cdecl filebuf::fd()		{ return xfd; }


class fstreambase : virtual public ios {
public:
		_Cdecl fstreambase();
		_Cdecl fstreambase(const char*, int, int = filebuf::openprot);
		_Cdecl fstreambase(int);
		_Cdecl fstreambase(int _f, char*, int);
		_Cdecl ~fstreambase();

	void	_Cdecl open(const char*, int, int = filebuf::openprot);
	void	_Cdecl attach(int);
	void	_Cdecl close();
	void	_Cdecl setbuf(char*, int);
	filebuf* _Cdecl rdbuf();

protected:
	void	_Cdecl verify(int);	// unimplemented	***

private:
	filebuf	buf;
};
/*
 * The function member marked with *** above is not documented in the AT&T
 * release of streams, so we cannot guarantee compatibility with any
 * other streams release in its use.
 * If you can document any expected behavior of this function member, we
 * will try to adjust our implementation accordingly.
 */
inline filebuf* _Cdecl fstreambase::rdbuf() { return &buf; }


class ifstream : public fstreambase, public istream {
public:
		_Cdecl ifstream();
		_Cdecl ifstream(const char*, int = ios::in, int = filebuf::openprot);
		_Cdecl ifstream(int);
		_Cdecl ifstream(int _f, char*, int);
		_Cdecl ~ifstream();

	filebuf* _Cdecl rdbuf();
	void	_Cdecl open(const char*, int = ios::in, int = filebuf::openprot);
};
inline filebuf* _Cdecl ifstream::rdbuf() { return fstreambase::rdbuf(); }
inline void	_Cdecl ifstream::open(const char* name, int m, int prot) {
    			fstreambase::open(name, m | ios::in, prot);
	        	}


class ofstream : public fstreambase, public ostream {
public:
		_Cdecl ofstream();
		_Cdecl ofstream(const char*, int = ios::out, int = filebuf::openprot);
		_Cdecl ofstream(int);
		_Cdecl ofstream(int _f, char*, int);
		_Cdecl ~ofstream();

	filebuf* _Cdecl rdbuf();
	void	_Cdecl open(const char*, int = ios::out, int = filebuf::openprot);
};
inline filebuf* _Cdecl ofstream::rdbuf() { return fstreambase::rdbuf(); }
inline void	_Cdecl ofstream::open(const char* name, int m, int prot) {
			    fstreambase::open(name, m | ios::out, prot);
        		}


class fstream : public fstreambase, public iostream {
public:
		_Cdecl fstream();
		_Cdecl fstream(const char*, int, int = filebuf::openprot);
		_Cdecl fstream(int);
		_Cdecl fstream(int _f, char*, int);
		_Cdecl ~fstream();

	filebuf* _Cdecl rdbuf();
	void	_Cdecl open(const char *, int, int = filebuf::openprot);
};
inline filebuf* _Cdecl fstream::rdbuf() { return fstreambase::rdbuf(); }
inline void	_Cdecl fstream::open(const char* name, int m, int prot) {
		    	fstreambase::open(name, m, prot);
        		}

#endif