chunk_slice.rs

chunk_slice.rs

fn foo(slice: &[u8]) -> (&str, Option<&[u8]>) {
    let mut iter = slice.utf8_chunks();
    // Annoying behavior of this iterator
    let Some(chunk) = iter.next() else {
        return (std::str::from_utf8(slice).unwrap(), None)
    };

    let head = chunk.valid();
    if head.len() < slice.len() {
        (head, Some(&slice[head.len()..]))
    } else {
        (head, None)
    }
}

fn main() {
    dbg!(foo("".as_ref()));
    dbg!(foo("hi".as_ref()));
    dbg!(foo(b"foo\xF1\x80bar"));
}