Function r_core::r_reg_next_diff

pub unsafe extern "C" fn r_reg_next_diff(
    reg: *mut RReg, 
    type_: c_int, 
    buf: *const c_uchar, 
    buflen: c_int, 
    prev_ri: *mut RRegItem, 
    regsize: c_int
) -> *mut RRegItem