109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
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// This is part of the iostream library, providing -*- C++ -*- input/output.
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// Copyright (C) 1992 Per Bothner.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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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 GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free
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// Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#ifdef __GNUG__
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#pragma implementation
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#endif
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#include <indstream.h>
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indirectbuf::indirectbuf(streambuf *get, streambuf *put, int delete_mode)
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: streambuf()
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{
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_get_stream = get;
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_put_stream = put == NULL ? get : put;
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_delete_flags = delete_mode;
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}
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indirectbuf::~indirectbuf()
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{
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if (_delete_flags & ios::in) delete get_stream();
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if (_delete_flags & ios::out) delete put_stream();
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}
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int indirectbuf::xsputn(const char* s, int n)
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{
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return put_stream()->sputn(s, n);
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}
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int indirectbuf::xsgetn(char* s, int n)
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{
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return get_stream()->sgetn(s, n);
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}
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int indirectbuf::overflow(int c /* = EOF */)
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{
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if (c == EOF)
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return put_stream()->overflow(c);
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else
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return put_stream()->sputc(c);
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}
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int indirectbuf::underflow()
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{
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return get_stream()->sbumpc();
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}
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streampos indirectbuf::seekoff(streamoff off, _seek_dir dir, int mode)
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{
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int ret_val = 0;
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int select = mode == 0 ? (ios::in|ios::out) : mode;
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streambuf *gbuf = (select & ios::in) ? get_stream() : NULL;
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streambuf *pbuf = (select & ios::out) ? put_stream() : NULL;
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if (gbuf == pbuf)
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ret_val = gbuf->seekoff(off, dir, mode);
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else {
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if (gbuf)
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ret_val = gbuf->seekoff(off, dir, ios::in);
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if (pbuf && ret_val != EOF)
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ret_val = pbuf->seekoff(off, dir, ios::out);
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}
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return ret_val;
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}
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streampos indirectbuf::seekpos(streampos pos, int mode)
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{
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int ret_val = EOF;
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int select = mode == 0 ? (ios::in|ios::out) : mode;
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streambuf *gbuf = (select & ios::in) ? get_stream() : NULL;
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streambuf *pbuf = (select & ios::out) ? put_stream() : NULL;
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if (gbuf == pbuf)
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ret_val = gbuf->seekpos(pos, mode);
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else {
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if (gbuf)
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ret_val = gbuf->seekpos(pos, ios::in);
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if (pbuf && ret_val != EOF)
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ret_val = pbuf->seekpos(pos, ios::out);
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}
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return ret_val;
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}
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int indirectbuf::sync()
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{
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streambuf *gbuf = get_stream();
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int ret_val = gbuf->sync();
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if (ret_val == EOF) return ret_val;
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streambuf *pbuf = put_stream();
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if (pbuf != gbuf) return pbuf->sync();
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else return ret_val;
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}
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int indirectbuf::pbackfail(int c)
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{
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return get_stream()->sputbackc(c);
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}
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