Function gfsubc_c 

pub unsafe extern "C" fn gfsubc_c(
    target: *const c_char,
    fixref: *const c_char,
    method: *const c_char,
    abcorr: *const c_char,
    obsrvr: *const c_char,
    crdsys: *const c_char,
    coord: *const c_char,
    relate: *const c_char,
    refval: SpiceDouble,
    adjust: SpiceDouble,
    step: SpiceDouble,
    nintvls: SpiceInt,
    cnfine: *mut SpiceCell,
    result: *mut SpiceCell,
)