78 lines
2.9 KiB
C++
78 lines
2.9 KiB
C++
/* This is part of libio/iostream, providing -*- C++ -*- input/output.
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Copyright (C) 1993 Free Software Foundation
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This file is part of the GNU IO Library. This library is free
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software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License.
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Written by Per Bothner (bothner@cygnus.com). */
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#ifndef _INDSTREAM_H
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#define _INDSTREAM_H
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#ifdef __GNUG__
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#pragma interface
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#endif
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#include <iostream.h>
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extern "C++" {
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// An indirectbuf is one that forwards all of its I/O requests
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// to another streambuf.
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// All get-related requests are sent to get_stream().
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// All put-related requests are sent to put_stream().
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// An indirectbuf can be used to implement Common Lisp
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// synonym-streams and two-way-streams.
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//
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// class synonymbuf : public indirectbuf {
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// Symbol *sym;
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// synonymbuf(Symbol *s) { sym = s; }
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// virtual streambuf *lookup_stream(int mode) {
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// return coerce_to_streambuf(lookup_value(sym)); }
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// };
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class indirectbuf : public streambuf {
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protected:
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streambuf *_get_stream; // Optional cache for get_stream().
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streambuf *_put_stream; // Optional cache for put_stream().
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int _delete_flags;
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public:
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streambuf *get_stream()
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{ return _get_stream ? _get_stream : lookup_stream(ios::in); }
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streambuf *put_stream()
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{ return _put_stream ? _put_stream : lookup_stream(ios::out); }
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virtual streambuf *lookup_stream(int/*mode*/) { return NULL; } // ERROR!
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indirectbuf(streambuf *get=NULL, streambuf *put=NULL, int delete_mode=0);
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virtual ~indirectbuf();
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virtual streamsize xsputn(const char* s, streamsize n);
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virtual streamsize xsgetn(char* s, streamsize n);
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virtual int underflow();
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virtual int uflow();
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virtual int overflow(int c = EOF);
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virtual streampos seekoff(streamoff, _seek_dir, int mode=ios::in|ios::out);
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virtual streampos seekpos(streampos pos, int mode = ios::in|ios::out);
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virtual int sync();
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virtual int pbackfail(int c);
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};
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} // extern "C++"
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#endif /* !_INDSTREAM_H */
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