fn octal_triplet(input: &mut &str) -> ModalResult<u8>Expand description
Parse and convert a single octal triplet string into a byte.
This isn’t a trivial conversion as an octal has three bits and an octal triplet has thereby 9
bits. The highest bit is expected to be always 0. This is ensured via the conversion to u8,
which would otherwise overflow and throw an error.