sfile.h

早期freebsd实现

// This may look like C code, but it is really -*- C++ -*-
/* 
Copyright (C) 1988, 1992 Free Software Foundation
    written by Doug Lea ([e-mail])

This file is part of the GNU C++ Library.  This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.  This library is distributed in the hope
that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.  See the GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef _SFile_h
#ifdef __GNUG__
#pragma interface
#endif
#define _SFile_h 1

#include <fstream.h>

class SFile: public fstream
{
  protected:
    int       sz;                   // unit size for structured binary IO

public:
    SFile() : fstream() { }
    SFile(int fd, int size);
    SFile(const char *name, int size, int mode, int prot=0664);
    void open(const char *name, int size, int mode, int prot=0664);
    
    int       size() { return sz; }
    int       setsize(int s) { int old = sz; sz = s; return old; }
    
    SFile&    get(void* x);
    SFile&    put(void* x);
    SFile&    operator[](long i);
};

#endif