Function pio_subsystem_set_to_sub 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pio_subsystem_set_to_sub(
    set: *const PioSubsystemSet,
    error: *mut *mut PioError,
) -> *mut PioString

Write the set back as .sub text. The text is owned by the returned handle and read with pio_string_view; release it with pio_string_release.

Safety

Pointers and handles must satisfy the crate-level safety requirements.