Function strtok_r 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn strtok_r(
    s: *mut c_char,
    delimiter: *const c_char,
    lasts: *mut *mut c_char,
) -> *mut c_char

See https://pubs.opengroup.org/onlinepubs/9799919799/functions/strtok.html.