66 lines
2.4 KiB
C++
66 lines
2.4 KiB
C++
// This is part of the iostream library, providing -*- C++ -*- input/output.
|
|
// Copyright (C) 1992 Per Bothner.
|
|
//
|
|
// 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, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
#ifndef _INDSTREAM_H
|
|
#define _INDSTREAM_H
|
|
|
|
#ifdef __GNUG__
|
|
#pragma interface
|
|
#endif
|
|
|
|
#include <iostream.h>
|
|
|
|
// An indirectbuf is one that forwards all of its I/O requests
|
|
// to another streambuf.
|
|
// All get-related requests are sent to get_stream().
|
|
// All put-related requests are sent to put_stream().
|
|
|
|
// An indirectbuf can be used to implement Common Lisp
|
|
// synonym-streams and two-way-streams.
|
|
//
|
|
// class synonymbuf : public indirectbuf {
|
|
// Symbol *sym;
|
|
// synonymbuf(Symbol *s) { sym = s; }
|
|
// virtual streambuf *lookup_stream(int mode) {
|
|
// return coerce_to_streambuf(lookup_value(sym)); }
|
|
// };
|
|
|
|
class indirectbuf : public streambuf {
|
|
protected:
|
|
streambuf *_get_stream; // Optional cache for get_stream().
|
|
streambuf *_put_stream; // Optional cache for put_stream().
|
|
int _delete_flags;
|
|
public:
|
|
streambuf *get_stream()
|
|
{ return _get_stream ? _get_stream : lookup_stream(ios::in); }
|
|
streambuf *put_stream()
|
|
{ return _put_stream ? _put_stream : lookup_stream(ios::out); }
|
|
virtual streambuf *lookup_stream(int/*mode*/) { return NULL; } // ERROR!
|
|
indirectbuf(streambuf *get=NULL, streambuf *put=NULL, int delete_mode=0);
|
|
virtual ~indirectbuf();
|
|
virtual int xsputn(const char* s, int n);
|
|
virtual int xsgetn(char* s, int n);
|
|
virtual int underflow();
|
|
virtual int overflow(int c = EOF);
|
|
virtual streampos seekoff(streamoff, _seek_dir, int mode=ios::in|ios::out);
|
|
virtual streampos seekpos(streampos pos, int mode = ios::in|ios::out);
|
|
virtual int sync();
|
|
virtual int pbackfail(int c);
|
|
};
|
|
|
|
#endif /* !_INDSTREAM_H */
|