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According to Red Hat, this fixes "a bug on input buffer boundary and/or temporary composing buffer of multibyte characters". The patch was credited to Paulo Andrade <pandrade@redhat.com>. To be honest, I don't know how to trigger this bug or what the code removed by this fix really does, but this patch is in production use at Red Hat, removes some smelly stuff, and is not triggering any regression test failures, so I'll just take this one on faith. https://bugzilla.redhat.com/show_bug.cgi?id=1417886 att@4fa2020b src/cmd/ksh93/sh/fcin.c: - _fcmbget(): Remove some dodgy-looking buffer-fiddling code that is marked as "for testing purposes with small buffers". (cherry picked from commit 407760fdbddcb7f8ac92b5d1da29d3e09dac0369)
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