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,
)