142 lines
4.2 KiB
C++
142 lines
4.2 KiB
C++
/***
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*fstream.h - definitions/declarations for filebuf and fstream classes
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*
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* Copyright (c) 1991-1992, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* This file defines the classes, values, macros, and functions
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* used by the filebuf and fstream classes.
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* [AT&T C++]
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*
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****/
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#ifndef _INC_FSTREAM
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#define _INC_FSTREAM
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#include <iostream.h>
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// Force word packing to avoid possible -Zp override
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#pragma pack(2)
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#pragma warning(disable:4505) // disable unwanted /W4 warning
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// #pragma warning(default:4505) // use this to reenable, if necessary
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#ifdef M_I86HM
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#define _HFAR_ __far
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#else
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#define _HFAR_
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#endif
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typedef int filedesc;
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class filebuf : public streambuf {
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public:
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static const int openprot; // default share/prot mode for open
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// optional share values for 3rd argument (prot) of open or constructor
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static const int sh_compat; // compatibility share mode
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static const int sh_none; // exclusive mode no sharing
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static const int sh_read; // allow read sharing
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static const int sh_write; // allow write sharing
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// use (sh_read | sh_write) to allow both read and write sharing
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// options for setmode member function
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static const int binary;
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static const int text;
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filebuf();
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filebuf(filedesc);
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filebuf(filedesc, char _HFAR_ *, int);
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~filebuf();
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filebuf* attach(filedesc);
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filedesc fd() const { return (x_fd==-1) ? EOF : x_fd; }
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int is_open() const { return (x_fd!=-1); }
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filebuf* open(const char _HFAR_ *, int, int = filebuf::openprot);
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filebuf* close();
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int setmode(int = filebuf::text);
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virtual int overflow(int=EOF);
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virtual int underflow();
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virtual streambuf* setbuf(char _HFAR_ *, int);
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virtual streampos seekoff(streamoff, ios::seek_dir, int);
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// virtual streampos seekpos(streampos, int);
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virtual int sync();
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private:
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filedesc x_fd;
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int x_fOpened;
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};
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class ifstream : public istream {
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public:
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ifstream();
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ifstream(const char _HFAR_ *, int =ios::in, int = filebuf::openprot);
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ifstream(filedesc);
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ifstream(filedesc, char _HFAR_ *, int);
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~ifstream();
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streambuf * setbuf(char _HFAR_ *, int);
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filebuf* rdbuf() const { return (filebuf*) ios::rdbuf(); }
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void attach(filedesc);
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filedesc fd() const { return rdbuf()->fd(); }
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int is_open() const { return rdbuf()->is_open(); }
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void open(const char _HFAR_ *, int =ios::in, int = filebuf::openprot);
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void close();
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int setmode(int mode = filebuf::text) { return rdbuf()->setmode(mode); }
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};
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class ofstream : public ostream {
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public:
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ofstream();
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ofstream(const char _HFAR_ *, int =ios::out, int = filebuf::openprot);
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ofstream(filedesc);
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ofstream(filedesc, char _HFAR_ *, int);
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~ofstream();
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streambuf * setbuf(char _HFAR_ *, int);
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filebuf* rdbuf() const { return (filebuf*) ios::rdbuf(); }
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void attach(filedesc);
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filedesc fd() const { return rdbuf()->fd(); }
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int is_open() const { return rdbuf()->is_open(); }
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void open(const char _HFAR_ *, int =ios::out, int = filebuf::openprot);
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void close();
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int setmode(int mode = filebuf::text) { return rdbuf()->setmode(mode); }
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};
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class fstream : public iostream {
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public:
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fstream();
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fstream(const char _HFAR_ *, int, int = filebuf::openprot);
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fstream(filedesc);
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fstream(filedesc, char _HFAR_ *, int);
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~fstream();
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streambuf * setbuf(char _HFAR_ *, int);
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filebuf* rdbuf() const { return (filebuf*) ostream::rdbuf(); }
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void attach(filedesc);
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filedesc fd() const { return rdbuf()->fd(); }
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int is_open() const { return rdbuf()->is_open(); }
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void open(const char _HFAR_ *, int, int = filebuf::openprot);
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void close();
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int setmode(int mode = filebuf::text) { return rdbuf()->setmode(mode); }
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};
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// manipulators to dynamically change file access mode (filebufs only)
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inline ios& binary(ios& _fstrm) \
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{ ((filebuf*)_fstrm.rdbuf())->setmode(filebuf::binary); return _fstrm; }
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inline ios& text(ios& _fstrm) \
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{ ((filebuf*)_fstrm.rdbuf())->setmode(filebuf::text); return _fstrm; }
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// Restore default packing
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#pragma pack()
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#endif
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