I think this happened recently on macos: the libc string parsing functions started complying with the C spec and broke some code (so you now need to check errno

I think this happened recently on macos: the libc string parsing functions started complying with the C spec and broke some code (so you now need to check errno and the return value if you want to know the result was valid or not) I don't think it was deliberate, I suspect they may have switched libc or something.