Continuing my monologue, with due consideration of comments posted, ...
On 10/23/2024 10:01 PM, Mark Geisert via Cygwin wrote:
Replying to myself, I continue...
On 10/22/2024 10:33 PM, Mark Geisert via Cygwin wrote:
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!
This is a locale issue. In the default Cygwin locale, rev mishandles
the \x80 byte and instead of stopping with an error message it enters an
infinite loop. I'll probably report this upstream instead of working
out a local fix.
Upstream util-linux 2.40.2 has an updated 'rev' that stops with an error
message when the OP's testcase is tried. I'm testing the full 2.40.2
for Cygwin release before too long.
There is a work-around: change to the "C" locale just to run rev.
LC_ALL=C rev zzz
where zzz is a file containing your four lines. You can also run your
original testcase with "rev" replaced by "LC_ALL=C rev" in both places.
Implicit in that suggestion is that the OP seemed to be uninterested in
any form of multi-byte characters.. just straightforward operation on
bytes, even if they have the high bit set.
That said, I appreciate the follow-up comments that dealt with the
general problem.
Thanks all,
..mark
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