| /* 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). */ |
| |
| #ifdef __GNUG__ |
| #pragma implementation |
| #endif |
| |
| #include <indstream.h> |
| |
| 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(); |
| } |
| |
| streamsize indirectbuf::xsputn(const char* s, streamsize n) |
| { |
| return put_stream()->sputn(s, n); |
| } |
| |
| streamsize indirectbuf::xsgetn(char* s, streamsize 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()->sgetc(); |
| } |
| |
| int indirectbuf::uflow() |
| { |
| 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() : (streambuf*)NULL; |
| streambuf *pbuf = (select & ios::out) ? put_stream() : (streambuf*)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() : (streambuf*)NULL; |
| streambuf *pbuf = (select & ios::out) ? put_stream() : (streambuf*)NULL; |
| if (gbuf == pbuf && gbuf != NULL) |
| 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 get_ret_val = gbuf ? gbuf->sync() : 0; |
| streambuf *pbuf = put_stream(); |
| int put_ret_val = (pbuf && pbuf != gbuf) ? pbuf->sync() : 0; |
| return get_ret_val || put_ret_val; |
| } |
| |
| int indirectbuf::pbackfail(int c) |
| { |
| return get_stream()->sputbackc(c); |
| } |