Function current_path

src/operations.cpp:3599–3667

}

BOOST_FILESYSTEM_DECL
path current_path(error_code* ec)
{
#if defined(BOOST_FILESYSTEM_USE_WASI)
    // Windows CE has no current directory, so everything's relative to the root of the directory tree.
    // WASI also does not support current path.
    emit_error(BOOST_ERROR_NOT_SUPPORTED, ec, "boost::filesystem::current_path");
    return path();
#elif defined(BOOST_FILESYSTEM_POSIX_API)
    struct local
    {
        static bool getcwd_error(error_code* ec)
        {
            const int err = errno;
            return error((err != ERANGE
#if defined(__MSL__) && (defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__))
                          // bug in some versions of the Metrowerks C lib on the Mac: wrong errno set
                          && err != 0
#endif
                          ) ? err : 0,
                         ec, "boost::filesystem::current_path");
        }
    };

    path cur;
    char small_buf[small_path_size];
    const char* p = ::getcwd(small_buf, sizeof(small_buf));
    if (BOOST_LIKELY(!!p))
    {
        cur = p;
        if (ec)
            ec->clear();
    }
    else if (BOOST_LIKELY(!local::getcwd_error(ec)))
    {
        for (std::size_t path_max = sizeof(small_buf) * 2u;; path_max *= 2u) // loop 'til buffer large enough
        {
            if (BOOST_UNLIKELY(path_max > absolute_path_max))
            {
                emit_error(ENAMETOOLONG, ec, "boost::filesystem::current_path");
                break;
            }

            std::unique_ptr< char[] > buf(new char[path_max]);
            p = ::getcwd(buf.get(), path_max);
            if (BOOST_LIKELY(!!p))
            {
                cur = buf.get();
                if (ec)
                    ec->clear();
                break;
            }
            else if (BOOST_UNLIKELY(local::getcwd_error(ec)))
            {
                break;
            }
        }
    }