get_time.hpp

#pragma once

#include "std/target_os.hpp"

#if defined(OMIM_OS_LINUX)
#include <cassert>
#endif

#include <iomanip>

namespace base
{
#if defined(OMIM_OS_LINUX)

namespace detail
{
template <class _CharT>
struct get_time_manip
{
  tm * __tm_;
  const _CharT * __fmt_;

  get_time_manip(tm * __tm, const _CharT * __fmt) : __tm_(__tm), __fmt_(__fmt) {}
};

template <class _CharT, class _Traits>
class stream_buf_impl : public std::basic_streambuf<_CharT, _Traits>
{
  typedef std::basic_streambuf<_CharT, _Traits> base_t;

public:
  bool parse(const get_time_manip<_CharT> & __x)
  {
    // Workaround works only for a stream buffer under null-terminated string.
    assert(*base_t::egptr() == 0);

    char * res = ::strptime(base_t::gptr(), __x.__fmt_, __x.__tm_);
    if (res == 0)
      return false;
    else
    {
      base_t::setg(base_t::eback(), res, base_t::egptr());
      return true;
    }
  }
};

template <class _CharT, class _Traits>
std::basic_istream<_CharT, _Traits> & operator>>(std::basic_istream<_CharT, _Traits> & __is,
                                                 const get_time_manip<_CharT> & __x)
{
  if (!reinterpret_cast<stream_buf_impl<_CharT, _Traits> *>(__is.rdbuf())->parse(__x))
    __is.setstate(std::ios_base::failbit);
  return __is;
}
}  // namespace detail

template <class _CharT>
detail::get_time_manip<_CharT> get_time(tm * __tm, const _CharT * __fmt)
{
  return detail::get_time_manip<_CharT>(__tm, __fmt);
}

#else

using std::get_time;

#endif
}  // namespace base