bug#17878: Possible bug in GNU ls with -R

[fuz]

I think I found behavior in GNU ls that deviates from the behavior
specified by POSIX.1 2008:

If GNU ls is called on one directory without subdirectories with the
option -R, it prints a directory heading like this:

    $ ls -RF
    .:
    foo  bar*  baz

POSIX.1 2008[1] says about this directory heading:

> If more than one directory, or a combination of non-directory files
> and directories are written, either as a result of specifying
> multiple operands, or the -R option, each list of files within a
> directory shall be preceded by:
>
>     "\n%s:\n", <directory name>
>
> If this string is the first thing to be written, the first <newline>
> shall not be written. This output shall precede the number of units
> in the directory.

In the case described above, ls writes a listing for one directory (.)
and does not list any non-directory files. Therefore, according to the
above specification, the ".:" heading may not be printed, but GNU ls
does do so. I suspect this is an oversight on the side of the
developers of the GNU coreutils.

I am using the following version of GNU ls:

    $ ls --version

    ls (GNU coreutils) 8.20
    Copyright (C) 2012 Free Software Foundation, Inc.
    License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>.
    This is free software: you are free to change and redistribute it.
    There is NO WARRANTY, to the extent permitted by law.

    Written by Richard M. Stallman and David MacKenzie.

Thank you very much for your help.
Yours sincerely,
Robert Clausecker

[1]: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.html

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