Method size

extlibs/fmt/src/os.cc:207–231

}

long long file::size() const {
#  ifdef _WIN32
  // Use GetFileSize instead of GetFileSizeEx for the case when _WIN32_WINNT
  // is less than 0x0500 as is the case with some default MinGW builds.
  // Both functions support large file sizes.
  DWORD size_upper = 0;
  HANDLE handle = reinterpret_cast<HANDLE>(_get_osfhandle(fd_));
  DWORD size_lower = FMT_SYSTEM(GetFileSize(handle, &size_upper));
  if (size_lower == INVALID_FILE_SIZE) {
    DWORD error = GetLastError();
    if (error != NO_ERROR)
      FMT_THROW(windows_error(GetLastError(), "cannot get file size"));
  }
  unsigned long long long_size = size_upper;
  return (long_size << sizeof(DWORD) * CHAR_BIT) | size_lower;
#  else
  using Stat = struct stat;
  Stat file_stat = Stat();
  if (FMT_POSIX_CALL(fstat(fd_, &file_stat)) == -1)
    FMT_THROW(system_error(errno, "cannot get file attributes"));
  static_assert(sizeof(long long) >= sizeof(file_stat.st_size),
                "return type of file::size is not large enough");
  return file_stat.st_size;
#  endif
}

std::size_t file::read(void* buffer, std::size_t count) {
  RWResult result = 0;