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/*
** PJL C++ Library
** fdbuf.h
**
** Copyright (C) 2001 Paul J. Lucas
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef fdbuf_H
#define fdbuf_H
// local
#include "platform.h"
// standard
#include <iostream>
#include <streambuf>
namespace PJL {
//*****************************************************************************
//
// SYNOPSIS
//
class fdbuf : public std::streambuf
//
// DESCRIPTION
//
// An fdbuf is-a streambuf that is used to be attached to a Unix file
// descriptor.
//
// SEE ALSO
//
// Nicolai M. Josuttis. "The C++ Starndard Library: A Tutorial and
// Reference," Addison-Wesley, 1999, pp. 672-676.
//
// Angelika Langer and Klaus Kreft. "Standard C++ IOStreams and Locales:
// Advanced Programmer's Guide and Reference," Addison-Wesley, 2000, pp.
// 225-244.
//
//*****************************************************************************
{
enum { buf_size = 1024 };
public:
explicit fdbuf( int fd = -1 ) { init( fd ); }
~fdbuf() { if ( fd_ > -1 ) sync(); }
// default copy constructor is fine
// default assignment is fine
void attach( int fd );
// In the case where an fdbuf object was constructed using the default
// constructor, and therefore not attached to any file descriptor,
// this function is used to attach an fdbuf to one at some later time.
protected:
typedef int int_type;
virtual int_type overflow( int_type c );
virtual int sync();
virtual int_type underflow();
std::streamsize write_buf( char const*, std::streamsize );
virtual std::streamsize xsputn( char const *buf, std::streamsize len );
private:
int fd_;
char rbuf_[ buf_size ];
char wbuf_[ buf_size ];
void init( int fd );
};
/////////// Inlines ///////////////////////////////////////////////////////////
inline void fdbuf::attach( int fd ) {
if ( fd_ > -1 ) sync();
init( fd );
}
} // namespace PJL
#endif /* fdbuf_H */
/* vim:set et sw=4 ts=4: */
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