mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-28 19:35:54 +08:00
122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
/* 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);
|
|
}
|