Function ucnv_toUChars

pub unsafe fn ucnv_toUChars<P3>(
    cnv: *mut UConverter,
    dest: *mut u16,
    destcapacity: i32,
    src: P3,
    srclength: i32,
    perrorcode: *mut UErrorCode,
) -> i32
where
    P3: Param<PCSTR>,