tar checkpoint-action screen width padding

[Steven Penny]

You can run a command like this via mintty:

    $ tar -x -f php-7.1.10.tar.xz --checkpoint-action ttyout=%c
    2017-10-17 20:28:01: 0s, read: 81920 (80KiB, 5.1MiB/s)

and it updates the status on the same line. However if you run via Cygwin.bat,
it prints on multiple lines. If you break down "%c" via this page:

http://gnu.org/software/tar/manual/html_section/tar_26

You get this:

    %{%Y-%m-%d %H:%M:%S}t: %ds, %{read,wrote}T%*\r

after some troubleshooting this is the problem:

    %*

here is what that does:

    %{n}*
    Pad output with spaces to the nth column. If the {n} part is omitted, the
    current screen width is assumed.

So the issue is either that "%*" is printing 1 too many spaces, or that "\r" is
taking up a character when it should not be.


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