Is this correct behaviour for 'rev'?

[Mark Geisert]

On 10/22/2024 8:00 PM, Backwoods BC via Cygwin wrote:
> It appears that 'rev' is choking on any character \x80 or higher, but
> is OK with those \x1f or smaller. It doesn't give an error or ignore
> it, it just stops.
> 
> I don't have access to a Linux box so I can't see if this happens
> there and nothing in the documentation suggests that this is the
> correct functionality.
> 
> Test case:
> printf 'no non-ASCII characters\nhex 01 >\x01< here\nhex 80 >\x80<
> here\nLine 4\n'|rev|rev
> 
> This is for "rev from util-linux 2.33.1"
> 
> I don't have the current version of 'rev' on my system due to not
> having updated in a while. I accidentally screwed up my installation
> and have been reluctant to wipe it and start over.
> 
> So, is this the expected behaviour for the current version of 'rev'
> under Cygwin and/or Linux?

The current Cygwin util-linux 2.39.3-2 rev behaves in the same, broken 
way.  It looks like line-ending char(s) are not being handled correctly. 
  Don't know yet if it's rev itself or fgetws() being used by rev that's 
busted.  I'll investigate further.  Thanks for the report!

..mark