Liren Large Software Subsidy 7/07.iso/c/c081_11/2.ddi/INCLUDE.ZIP/FSTREAM.H

C/C++ Source or Header | 1991-02-13 | 5.6 KB | 175 lines

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

    Copyright (c) 1990,1991 by Borland International
    All rights reserved
*/

#ifndef __cplusplus
#error Must use C++ for the type fstream.
#endif

#ifndef __FSTREAM_H
#define __FSTREAM_H

#if !defined( __IOSTREAM_H )
#include <iostream.h>
#endif

#ifdef __DLL__
#define _FAR far
#else
#define _FAR
#endif

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

#if   defined(__SMALL__) || defined(__MEDIUM__)
#define _CLASSTYPE  near
#elif defined(__COMPACT__) || defined(__LARGE__)
#define _CLASSTYPE  far
#else
#define _CLASSTYPE  huge
#endif

class  _CLASSTYPE 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 _FAR *, 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 _FAR * _Cdecl open( const char _FAR *, int,
                                int = filebuf::openprot );

    filebuf _FAR * _Cdecl close();      // flush and close file
    filebuf _FAR * _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 _FAR * _Cdecl setbuf(char _FAR *, 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 _FAR *   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 _CLASSTYPE fstreambase : virtual public ios {
public:
    _Cdecl fstreambase();
    _Cdecl fstreambase(const char _FAR *, int, int = filebuf::openprot);
    _Cdecl fstreambase(int);
    _Cdecl fstreambase(int _f, char _FAR *, int);
    _Cdecl ~fstreambase();

    void    _Cdecl open(const char _FAR *, int, int = filebuf::openprot);
    void    _Cdecl attach(int);
    void    _Cdecl close();
    void    _Cdecl setbuf(char _FAR *, int);
    filebuf _FAR * _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 _FAR * _Cdecl fstreambase::rdbuf() { return &buf; }


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

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


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

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


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

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

#endif