Function switch_split_user_domain 

pub unsafe extern "C" fn switch_split_user_domain(
    in_: *mut c_char,
    user: *mut *mut c_char,
    domain: *mut *mut c_char,
) -> c_int

\brief Split a user@domain string as user and domain \param in the input string \param user the string to put the user into \param domain the string to put the domain into \return 1 if successfull \note Extended formats protocol:user@domain:port (Example: sip:toto@example.org)