pub unsafe extern "C" fn ydb_subscript_next_st(
    tptoken: u64,
    errstr: *mut ydb_buffer_t,
    varname: *const ydb_buffer_t,
    subs_used: c_int,
    subsarray: *const ydb_buffer_t,
    ret_value: *mut ydb_buffer_t
) -> c_int