1 // (C) Copyright Jonathan Turkanis 2003.
2 // Distributed under the Boost Software License, Version 1.0. (See accompanying
3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
5 // See http://www.boost.org/libs/iostreams for documentation.
7 // Thanks to Gareth Sylvester-Bradley for the Dinkumware versions of the
8 // positioning functions.
10 #ifndef BOOST_IOSTREAMS_POSITIONING_HPP_INCLUDED
11 #define BOOST_IOSTREAMS_POSITIONING_HPP_INCLUDED
13 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
17 #include <boost/config.hpp>
18 #include <boost/cstdint.hpp>
19 #include <boost/integer_traits.hpp>
20 #include <boost/iostreams/detail/config/codecvt.hpp> // mbstate_t.
21 #include <boost/iostreams/detail/ios.hpp> // streamoff, streampos.
24 #include <boost/iostreams/detail/config/disable_warnings.hpp>
26 #ifdef BOOST_NO_STDC_NAMESPACE
27 namespace std { using ::fpos_t; }
30 namespace boost { namespace iostreams {
32 typedef boost::intmax_t stream_offset;
34 inline std::streamoff stream_offset_to_streamoff(stream_offset off)
35 { return static_cast<stream_offset>(off); }
37 template<typename PosType> // Hande custom pos_type's.
38 inline stream_offset position_to_offset(PosType pos)
39 { return std::streamoff(pos); }
41 #if ((defined(_YVALS) && !defined(__IBMCPP__)) || defined(_CPPLIB_VER)) && \
42 !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION) \
43 && !defined(__QNX__) \
48 inline std::streampos offset_to_position(stream_offset off)
50 // Use implementation-specific constructor.
51 return std::streampos(std::mbstate_t(), off);
54 inline stream_offset fpos_t_to_offset(std::fpos_t pos)
56 #if defined(_POSIX_) || (_INTEGRAL_MAX_BITS >= 64)
63 # if defined(_CPPLIB_VER) //--------------------------------------------------//
65 /* Recent Dinkumware */
67 inline stream_offset position_to_offset(std::streampos pos)
69 // Use implementation-specific member function seekpos().
70 return fpos_t_to_offset(pos.seekpos()) +
71 stream_offset(std::streamoff(pos)) -
72 stream_offset(std::streamoff(pos.seekpos()));
75 # else // # if defined(_CPPLIB_VER) //----------------------------------------//
79 inline stream_offset position_to_offset(std::streampos pos)
81 // use implementation-specific member function get_fpos_t().
82 return fpos_t_to_offset(pos.get_fpos_t()) +
83 stream_offset(std::streamoff(pos)) -
84 stream_offset(std::streamoff(pos.get_fpos_t()));
87 # endif // # if defined(_CPPLIB_VER) //---------------------------------------//
88 #else // Dinkumware //--------------------------------------------------------//
92 inline std::streampos offset_to_position(stream_offset off) { return off; }
94 inline stream_offset position_to_offset(std::streampos pos) { return pos; }
96 #endif // Dinkumware //-------------------------------------------------------//
98 } } // End namespaces iostreams, boost.
100 #include <boost/iostreams/detail/config/enable_warnings.hpp>
102 #endif // #ifndef BOOST_IOSTREAMS_POSITIONING_HPP_INCLUDED