Re: [PATCH v2 2/3] pretty.c: capture invalid trailer argument

>
> "Hariom Verma via GitGitGadget" <gitgitgadget@gmail.com> writes:
>
> > +                     size_t invalid_arg_len = strcspn(*arg, ",)");
> > +                     *invalid_arg = xstrndup(*arg, invalid_arg_len);
> > +                     return 1;
>
> How about doing this only when invalid_arg is not NULL, i.e.
>
>         } else if (!match_placeholder_bool_arg(....) &&
>                    ...
>                    !match_placeholder_bool_arg(....)) {
>                 if (invalid_arg) {
>                         size_t len = strcspn(*arg, ",)");
>                         *invalid_arg = xstrndup(*arg, len);
>                 }
>                 return -1;
>         }

> Note that I just used 'len'; when the scope of a variable is so
> short, it is clear the length of what thing it refers to from the
> context, and there is no point in using a variable name that long.
>
> In any case, by doing so, the callers that are not interested in the
> report can just pass NULL, which means ...
>
> > @@ -1464,12 +1472,13 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
> >               struct strbuf sepbuf = STRBUF_INIT;
> >               struct strbuf kvsepbuf = STRBUF_INIT;
> >               size_t ret = 0;
> > +             char *unused = NULL;
>
> ... this will become unneeded, and ...
>
> >               opts.no_divider = 1;
> >
> >               if (*arg == ':') {
> >                       arg++;
> > -                     if (format_set_trailers_options(&opts, &filter_list, &sepbuf, &kvsepbuf, &arg))
> > +                     if (format_set_trailers_options(&opts, &filter_list, &sepbuf, &kvsepbuf, &arg, &unused))
> >                               goto trailer_out;
>
> ... this will pass NULL, and ...
>
> >               }
> >               if (*arg == ')') {
> > @@ -1479,6 +1488,7 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
> >       trailer_out:
> >               string_list_clear(&filter_list, 0);
> >               strbuf_release(&sepbuf);
> > +             free((char *)unused);
>
> ... this will become unneeded.
>