On Thu, Sep 11, 2014 at 05:38:21PM -0700, Alex Wang wrote:
> This commit adds function that extracts (both long and short)
> options and returns them as string.  Right now, only ovs-appctl
> command provides an option to print this function output.  And
> the output is to be used by bash command-line completion script
> for completion other options of the same command.
> 
> Signed-off-by: Alex Wang <al...@nicira.com>

The output format doesn't distinguish between optional and required
options.  Should it?

> +    ret = xstrdup(ds_cstr(&ds));
> +    ds_destroy(&ds);
> +
> +    return ret;

I would replace the above by just "return ds.string;"

>  static void
> +print_appctl_options(const struct option options[])
> +{
> +    char *opts;
> +
> +    opts = print_options(options);
> +    printf("%s", opts);
> +    free(opts);
> +
> +    exit(EXIT_SUCCESS);
> +}

print_appctl_options() plus print_options() makes for a flexible
interface, but do you expect that there will be other users that don't
want to what print_appctl_options() does?  I'd be inclined toward just
making print_options() do what print_appctl_options() does and skip the
extra wrapper.

None of this matters that much so:
    Acked-by: Ben Pfaff <b...@nicira.com>
but I don't want it to be applied until the command-line completion code
is also reviewed by someone.
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