Function take_owned_cstring_c 

pub unsafe fn take_owned_cstring_c<Free>(
    ptr: *mut c_char,
    free_fn: Free,
) -> Option<String>
where
    Free: FnOnce(*mut c_char),

Same as take_owned_cstring but for *mut std::ffi::c_char.

Rust 1.71+ distinguishes c_char from i8 on some targets. Functionally identical to the i8 variant.

Safety

Same requirements as take_owned_cstring.