Implement "uniq -z", like "sort -z"

[James Youngman]

This patch (against current coreutils anon-CVS) implements a -z option
to uniq.

It is like sort's -z option.   It has the same long form,
--zero-terminated, as the -z option to sort.    The implementation
relies on the linebuffer module offering readlinebuffer_delim.  I
submitted an implementation for that function to bug-gnulib this
morning.

To avoid potential problems with whitespace change, I have attached
the patch to this email rather than pasting it in.  I also include the
text of the relevant ChangeLog entry inline.

Thanks,
James.



2007-05-12  James Youngman  <address@hidden>

        Add -z option to uniq.  This was originally proposed by
        Egmont Koblinger.
        * NEWS: Mention that uniq has gained a new option,
        --zero-terminated (-z).
        * src/uniq.c (longopts, check_file, main): Added new option
        --zero-terminated (-z).  This makes uniq consume and produce
        NUL-terminated lines rather than newline-terminated lines, which
        is the default.   Pass the delimiter as a function argument from
        main into check_file.
        * doc/uniq.texi (uniq invocation): Describe the new option
        --zero-terminated (-z).
        * tests/uniq/Test.pm (@tv): add a number of new tests for the uniq
        option -z (and its synonym, --zero-terminated).
        * tests/uniq/Makefile.am (run_gen, maint_gen): add the new test
        files generated by the updated Test.pm file.

uniq-z.patch
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