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Subject: [Bug 220009] stty iutf8 not supported
Date: Thu, 15 Jun 2017 11:43:24 +0000
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X-Bugzilla-Severity: Affects Many People
X-Bugzilla-Who: rtc@helen.plasma.xg8.de
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220009

            Bug ID: 220009
           Summary: stty iutf8 not supported
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: rtc@helen.plasma.xg8.de

Linux has a stty setting iutf8. This is necessary for utf-8 locales for the
following reason:

When you enter a non-us-ascii utf-8 character in canonical mode (for exampl=
e,
when cat > file is run on the shell command line) it will be two or more by=
tes
long. If you now hit the erase key (ie., backspace) only one byte will be
deleted from the input buffer. For example, if you input =C3=A4=C3=BC and h=
it backspace,
the input buffer will now contain two bytes of utf-8 code for =C3=A4 and th=
e first
byte of the utf-8 code for =C3=BC, for a total of three bytes, which are in=
valid.

The iutf8 flag tells the terminal that the input is in utf8 and that the er=
ase
key in canonical mode should erase all bytes of the rightmost character.

FreeBSD should support iutf8 so that canonical mode works fine with utf8
locales.

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