bug(date): a file that contains \xFF, will lead to no error even with --debug and exits with status code 0 whiches success

[HackingRepo]

Hi, uutils mainteners

that is a critical issue as i see, we used

relunsec@relunsec:~/software/coreutils/target/debug$ echo -n $'Hello\xFFUiOP:IOyutyrT%YUt' > date_file.txt
relunsec@relunsec:~/software/coreutils/target/debug$ ./date -f date_file.txt  --debug
relunsec@relunsec:~/software/coreutils/target/debug$ gnudate -f date_file.txt  --debug
date: error: unknown word 'HELLO'
date: error: parsing failed, stopped at '�UiOP:IOyutyrT%YUt'
gnudate: invalid date ‘Hello\377UiOP:IOyutyrT%YUt’
relunsec@relunsec:~/software/coreutils/target/debug$ 

as you can see the gnu one rejects it, and even worse for uu date it even with --debug silent and exit code 0 just adding \xFF breaks parsing
whiches weird and very bad bug to see at all