Re: [cocci] Improving output for single characters (with SmPL)?

On Sat, 1 Aug 2026, Markus Elfring wrote:

> >> Which implementation details should be reconsidered here for an affected macro?
> >> https://elixir.bootlin.com/linux/v7.2-rc4/source/tools/bpf/bpftool/netlink_dumper.h#L25
> >
> > The shown source code transformation approach can be repeated on demand
> > for selected areas.
>
> I would like to add that only a single diff hunk is generated for the following script variant
> of the semantic patch language (as it would usually be expected for the mentioned software component).
>
> @replacement@
> @@
> -fprintf
> +putchar
>  (
> -stdout, "\n"
> +'\n'
>  )
>
>
> > Now I wonder about the following information.
> >
> > Markus_Elfring@Sonne:/home/altes_Heim2/elfring/Projekte/Linux/next-analyses> grep 'diff -u -p a/netlink_dumper.h b/netlink_dumper.h' /home/altes_Heim2/elfring/Projekte/Bau/Linux/scripts/Coccinelle/tuning1/next/20260721/use_fputc-bpftool-2.diff | wc -l
> > 2
>
> How can the generation of duplicate difference output be avoided here
> for other SmPL script variations?

I don't know the details o what you are doing, but if you have duplicated
output about herder files, it would be because the header file is included
in other files.  If there is no need to process the header file
specifically based on a given .c file (which would be the case for the rul
shown above), then you can use the option --no-includes.  If you want some
type information from header files but you don't want to transform them in
a way that is specific to the .c file in which they are included then you
can also use --include-headers-for-types.

julia


>
> Regards,
> Markus
>
>