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- // 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.
-
- #include <indstrea.h>
-
- #ifdef __GNUG__
- #pragma implementation
- #endif
-
- indirectbuf::indirectbuf(streambuf *get, streambuf *put, int delete_mode)
- : streambuf()
- {
- _get_stream = get;
- _put_stream = put == NULL ? get : put;
- _delete_flags = delete_mode;
- }
-
- indirectbuf::~indirectbuf()
- {
- if (_delete_flags & ios::in) delete get_stream();
- if (_delete_flags & ios::out) delete put_stream();
- }
-
- _G_size_t indirectbuf::xsputn(const char* s, _G_size_t n)
- {
- return put_stream()->sputn(s, n);
- }
-
- _G_size_t indirectbuf::xsgetn(char* s, _G_size_t n)
- {
- return get_stream()->sgetn(s, n);
- }
-
- int indirectbuf::overflow(int c /* = EOF */)
- {
- if (c == EOF)
- return put_stream()->overflow(c);
- else
- return put_stream()->sputc(c);
- }
-
- int indirectbuf::underflow()
- {
- return get_stream()->sbumpc();
- }
-
- streampos indirectbuf::seekoff(streamoff off, _seek_dir dir, int mode)
- {
- int ret_val = 0;
- int select = mode == 0 ? (ios::in|ios::out) : mode;
- streambuf *gbuf = (select & ios::in) ? get_stream() : NULL;
- streambuf *pbuf = (select & ios::out) ? put_stream() : NULL;
- if (gbuf == pbuf)
- ret_val = gbuf->seekoff(off, dir, mode);
- else {
- if (gbuf)
- ret_val = gbuf->seekoff(off, dir, ios::in);
- if (pbuf && ret_val != EOF)
- ret_val = pbuf->seekoff(off, dir, ios::out);
- }
- return ret_val;
- }
-
- streampos indirectbuf::seekpos(streampos pos, int mode)
- {
- int ret_val = EOF;
- int select = mode == 0 ? (ios::in|ios::out) : mode;
- streambuf *gbuf = (select & ios::in) ? get_stream() : NULL;
- streambuf *pbuf = (select & ios::out) ? put_stream() : NULL;
- if (gbuf == pbuf)
- ret_val = gbuf->seekpos(pos, mode);
- else {
- if (gbuf)
- ret_val = gbuf->seekpos(pos, ios::in);
- if (pbuf && ret_val != EOF)
- ret_val = pbuf->seekpos(pos, ios::out);
- }
- return ret_val;
- }
-
- int indirectbuf::sync()
- {
- streambuf *gbuf = get_stream();
- int ret_val = gbuf->sync();
- if (ret_val == EOF) return ret_val;
- streambuf *pbuf = put_stream();
- if (pbuf != gbuf) return pbuf->sync();
- else return ret_val;
- }
-
- int indirectbuf::pbackfail(int c)
- {
- return get_stream()->sputbackc(c);
- }
-