sl@0: // (C) Copyright Jonathan Turkanis 2003.
sl@0: // Distributed under the Boost Software License, Version 1.0. (See accompanying
sl@0: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
sl@0: 
sl@0: // See http://www.boost.org/libs/iostreams for documentation.
sl@0: 
sl@0: // Thanks to Gareth Sylvester-Bradley for the Dinkumware versions of the
sl@0: // positioning functions.
sl@0: 
sl@0: #ifndef BOOST_IOSTREAMS_POSITIONING_HPP_INCLUDED
sl@0: #define BOOST_IOSTREAMS_POSITIONING_HPP_INCLUDED
sl@0: 
sl@0: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
sl@0: # pragma once
sl@0: #endif
sl@0: 
sl@0: #include <boost/config.hpp>
sl@0: #include <boost/cstdint.hpp>
sl@0: #include <boost/integer_traits.hpp>
sl@0: #include <boost/iostreams/detail/config/codecvt.hpp> // mbstate_t.
sl@0: #include <boost/iostreams/detail/ios.hpp> // streamoff, streampos.
sl@0: 
sl@0: // Must come last.
sl@0: #include <boost/iostreams/detail/config/disable_warnings.hpp> 
sl@0: 
sl@0: #ifdef BOOST_NO_STDC_NAMESPACE
sl@0: namespace std { using ::fpos_t; }
sl@0: #endif
sl@0: 
sl@0: namespace boost { namespace iostreams {
sl@0: 
sl@0: typedef boost::intmax_t stream_offset;
sl@0: 
sl@0: inline std::streamoff stream_offset_to_streamoff(stream_offset off)
sl@0: { return static_cast<stream_offset>(off); }
sl@0: 
sl@0: template<typename PosType> // Hande custom pos_type's.
sl@0: inline stream_offset position_to_offset(PosType pos)
sl@0: { return std::streamoff(pos); }
sl@0: 
sl@0: #if ((defined(_YVALS) && !defined(__IBMCPP__)) || defined(_CPPLIB_VER)) && \
sl@0:      !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION) \
sl@0:      && !defined(__QNX__) \
sl@0:    /**/
sl@0: 
sl@0:         /* Dinkumware */
sl@0: 
sl@0: inline std::streampos offset_to_position(stream_offset off)
sl@0: {
sl@0:     // Use implementation-specific constructor.
sl@0:     return std::streampos(std::mbstate_t(), off);
sl@0: }
sl@0: 
sl@0: inline stream_offset fpos_t_to_offset(std::fpos_t pos)
sl@0: { // Helper function.
sl@0: #if defined(_POSIX_) || (_INTEGRAL_MAX_BITS >= 64)
sl@0:     return pos;
sl@0: #else
sl@0:     return _FPOSOFF(pos);
sl@0: #endif
sl@0: }
sl@0: 
sl@0: # if defined(_CPPLIB_VER) //--------------------------------------------------//
sl@0: 
sl@0:         /* Recent Dinkumware */
sl@0: 
sl@0: inline stream_offset position_to_offset(std::streampos pos)
sl@0: {
sl@0:     // Use implementation-specific member function seekpos().
sl@0:     return fpos_t_to_offset(pos.seekpos()) +
sl@0:            stream_offset(std::streamoff(pos)) -
sl@0:            stream_offset(std::streamoff(pos.seekpos()));
sl@0: }
sl@0: 
sl@0: # else // # if defined(_CPPLIB_VER) //----------------------------------------//
sl@0: 
sl@0:         /* Old Dinkumware */
sl@0: 
sl@0: inline stream_offset position_to_offset(std::streampos pos)
sl@0: {
sl@0:     // use implementation-specific member function get_fpos_t().
sl@0:     return fpos_t_to_offset(pos.get_fpos_t()) +
sl@0:            stream_offset(std::streamoff(pos)) -
sl@0:            stream_offset(std::streamoff(pos.get_fpos_t()));
sl@0: }
sl@0: 
sl@0: # endif // # if defined(_CPPLIB_VER) //---------------------------------------//
sl@0: #else // Dinkumware //--------------------------------------------------------//
sl@0: 
sl@0:         /* Non-Dinkumware */
sl@0: 
sl@0: inline std::streampos offset_to_position(stream_offset off) { return off; }
sl@0: 
sl@0: inline stream_offset position_to_offset(std::streampos pos) { return pos; }
sl@0: 
sl@0: #endif // Dinkumware //-------------------------------------------------------//
sl@0: 
sl@0: } } // End namespaces iostreams, boost.
sl@0: 
sl@0: #include <boost/iostreams/detail/config/enable_warnings.hpp> 
sl@0: 
sl@0: #endif // #ifndef BOOST_IOSTREAMS_POSITIONING_HPP_INCLUDED