Improving output for single characters (with SmPL)?

Hello,

I would like to achieve further source code adjustments by the means of
the following script variant for the semantic patch language.


Example:
@initialize:python@
@@
input =3D ''

def convert(item):
   mark =3D ["'", item, "'"]
   coccinelle.text =3D cocci.make_expr(''.join(mark))

def common_checks(unescaped):
   if input[1] =3D=3D '"':
      if input[2:] =3D=3D '':
         convert(input[0] if unescaped else '\\' + input[0])
      else:
         cocci.include_match(False)
   else:
      cocci.include_match(False)

@find_update_candidate@
constant char[] input_string;
expression input_context;
position pos;
@@
 fprintf@pos(input_context, input_string);

@script:python selection@
param << find_update_candidate.input_string;
text;
@@
if param[0] =3D=3D '"':
   input =3D param[1:]
   if input[0] =3D=3D '\\':
      input =3D input[1:]
      if input[0] =3D=3D '"':
         if input[1] =3D=3D '"':
            if input[2:] =3D=3D '':
               convert('"')
            else:
               cocci.include_match(False)
         else:
            cocci.include_match(False)
      else:
         common_checks(False)
   else:
      common_checks(True)
else:
   cocci.include_match(False)

@replacement@
constant char[] find_update_candidate.input_string, selection.text;
expression find_update_candidate.input_context;
position find_update_candidate.pos;
@@
(
-fprintf@pos
+putchar
 (
-stdout,
-input_string
+text
 )
|
-fprintf@pos
+fputc
 (input_context,
-input_string
+text
 )
)


Questionable test result (according to the software combination =E2=80=9CC=
occinelle 1.3.1=E2=80=9D):
Markus_Elfring@Sonne:=E2=80=A6/Projekte/Linux/next-analyses/tools> time /u=
sr/bin/spatch --timeout 23 -j4 --chunksize 1 --include-headers --no-loops =
-dir . =E2=80=A6/Projekte/Coccinelle/janitor/use_fputc-20260722.cocci > =
=E2=80=A6/Projekte/Bau/Linux/scripts/Coccinelle/tuning1/next/20260721/use_=
fputc.diff
=E2=80=A6
HANDLING: ./tracing/rtla/src/osnoise.c
An error occurred when attempting to transform some files.

real    0m34,627s
user    1m52,330s
sys     0m4,022s

Markus_Elfring@Sonne:=E2=80=A6/Projekte/Linux/next-analyses> lsdiff =E2=80=
=A6/Projekte/Bau/Linux/scripts/Coccinelle/tuning1/next/20260721/use_fputc.=
diff | wc -l
49

Markus_Elfring@Sonne:=E2=80=A6/Projekte/Linux/next2-patched/tools> LANG=3D=
C git apply =E2=80=A6/Projekte/Bau/Linux/scripts/Coccinelle/tuning1/next/2=
0260721/use_fputc.diff
error: patch failed: tools/bpf/bpftool/netlink_dumper.h:25
error: tools/bpf/bpftool/netlink_dumper.h: patch does not apply


Which implementation details should be reconsidered here for an affected m=
acro?
https://elixir.bootlin.com/linux/v7.2-rc4/source/tools/bpf/bpftool/netlink=
_dumper.h#L25

How will chances evolve to adjust more places according to remaining updat=
e candidates?

Regards,
Markus