Function atoui 

pub fn atoui(word: &[u8]) -> u32

Parse an unsigned decimal the way the C library’s conversion does, which is what every count and offset in a cross-reference table goes through.

Digits accumulate until a non-digit; overflow saturates at u32::MAX rather than wrapping; and a leading - negates in two’s complement, so -1 reads as 4294967295. Object-stream offsets in the wild rely on exactly that, which is why this is not str::parse.