Function cups_sys::ippAddString

pub unsafe extern "C" fn ippAddString(
    ipp: *mut ipp_t, 
    group: ipp_tag_t, 
    value_tag: ipp_tag_t, 
    name: *const c_char, 
    language: *const c_char, 
    value: *const c_char
) -> *mut ipp_attribute_t