mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-25 18:29:49 +08:00
78 lines
2.9 KiB
C++
78 lines
2.9 KiB
C++
/* This is part of libio/iostream, providing -*- C++ -*- input/output.
|
|
Copyright (C) 1993 Free Software Foundation
|
|
|
|
This file is part of the GNU IO Library. This library 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, 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this library; see the file COPYING. If not, write to the Free
|
|
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
As a special exception, if you link this library with files
|
|
compiled with a GNU compiler to produce an executable, this does not cause
|
|
the resulting executable to be covered by the GNU General Public License.
|
|
This exception does not however invalidate any other reasons why
|
|
the executable file might be covered by the GNU General Public License.
|
|
|
|
Written by Per Bothner (bothner@cygnus.com). */
|
|
|
|
#ifndef _INDSTREAM_H
|
|
#define _INDSTREAM_H
|
|
|
|
#ifdef __GNUG__
|
|
#pragma interface
|
|
#endif
|
|
|
|
#include <iostream.h>
|
|
|
|
extern "C++" {
|
|
// 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 streamsize xsputn(const char* s, streamsize n);
|
|
virtual streamsize xsgetn(char* s, streamsize n);
|
|
virtual int underflow();
|
|
virtual int uflow();
|
|
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);
|
|
};
|
|
} // extern "C++"
|
|
|
|
#endif /* !_INDSTREAM_H */
|