Method find_parent_path_size

src/path.cpp:780–815

}

BOOST_FILESYSTEM_DECL path_algorithms::string_type::size_type path_algorithms::find_parent_path_size(path const& p)
{
    const size_type size = p.m_pathname.size();
    size_type root_name_size = 0;
    size_type root_dir_pos = find_root_directory_start(p.m_pathname.c_str(), size, root_name_size);

    size_type filename_size = find_filename_size(p.m_pathname, root_name_size, size);
    size_type end_pos = size - filename_size;
    while (true)
    {
        if (end_pos <= root_name_size)
        {
            // Keep the root name as the parent path if there was a filename
            if (filename_size == 0)
                end_pos = 0u;
            break;
        }

        --end_pos;

        if (!detail::is_directory_separator(p.m_pathname[end_pos]))
        {
            ++end_pos;
            break;
        }

        if (end_pos == root_dir_pos)
        {
            // Keep the trailing root directory if there was a filename
            end_pos += filename_size > 0;
            break;
        }
    }

    return end_pos;
}

BOOST_FILESYSTEM_DECL path path_algorithms::filename_v3(path const& p)
{