117 lines
3.3 KiB
C++
117 lines
3.3 KiB
C++
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/* 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 GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, 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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#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 get_ret_val = gbuf ? gbuf->sync() : 0;
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streambuf *pbuf = put_stream();
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int put_ret_val = (pbuf && pbuf != gbuf) ? pbuf->sync() : 0;
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return get_ret_val || put_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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