[Bug 241679] /usr/bin/sort fails if UTF-8 input is received from stdin

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241679

            Bug ID: 241679
           Summary: /usr/bin/sort fails if UTF-8 input is received from
                    stdin
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: rfg-freebsd at tristatelogic.com

If /usr/bin/sort is given the name of a file on the command line and if that
file contains lines which themselves contain UTF-8 encoded data, then the sort
utility will function normally and as expexcted.  If on the other hand the same
file content is supplied to /usr/bin/sort via its stdin channel, then sort will
fail completely and will issue the following error message:

sort: Illegal byte sequence

The can be verified by placing the following line into a file called "test" and
then attempting to sort that file content in different ways:

zürich.email

Example #1:
sort test

The above works just fine.

Example #2:
sort < test

The above fails and issues the error:
sort: Illegal byte sequence

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