Function is_empty_directory

src/directory.cpp:1093–1166

Tests if the directory is empty

//! Tests if the directory is empty
bool is_empty_directory(boost::scope::unique_fd&& fd, path const& p, error_code* ec)
{
#if !defined(BOOST_FILESYSTEM_USE_READDIR_R)
    // Use a more optimal implementation without the overhead of constructing the iterator state

    struct closedir_deleter
    {
        using result_type = void;
        result_type operator() (DIR* dir) const noexcept
        {
            ::closedir(dir);
        }
    };

    int err;

#if defined(BOOST_FILESYSTEM_HAS_FDOPENDIR_NOFOLLOW)
    std::unique_ptr< DIR, closedir_deleter > dir(::fdopendir(fd.get()));
    if (BOOST_UNLIKELY(!dir))
    {
        err = errno;
    fail:
        emit_error(err, p, ec, "boost::filesystem::is_empty");
        return false;
    }

    // At this point fd will be closed by closedir
    fd.release();
#else // defined(BOOST_FILESYSTEM_HAS_FDOPENDIR_NOFOLLOW)
    std::unique_ptr< DIR, closedir_deleter > dir(::opendir(p.c_str()));
    if (BOOST_UNLIKELY(!dir))
    {
        err = errno;
    fail:
        emit_error(err, p, ec, "boost::filesystem::is_empty");
        return false;
    }
#endif // defined(BOOST_FILESYSTEM_HAS_FDOPENDIR_NOFOLLOW)

    while (true)
    {
        errno = 0;
        struct dirent* const ent = ::readdir(dir.get());
        if (!ent)
        {
            err = errno;
            if (err != 0)
                goto fail;

            return true;
        }

        // Skip dot and dot-dot entries
        if (!(ent->d_name[0] == path::dot
            && (ent->d_name[1] == static_cast< path::string_type::value_type >('\0') ||
                (ent->d_name[1] == path::dot && ent->d_name[2] == static_cast< path::string_type::value_type >('\0')))))
        {
            return false;