That’s fair: you won’t be able to use any libc functions that rely on null termination. But a lot of the time you don’t need to either. Think writing the substring to a socket or comparing it to a known constant.
In Rust, you would do both of those with a &str, which works fine. Just works exactly as in C, with no calls to memcopy or allocator or anything. And you would also be able to do all the other things that in C use null termination, too.
