Re: [PATCH] unit-tests: use xstrfmt() instead of a char buffer in t-reftable-stack

> One thing that this worsens is that we now have two copies of the
> literal "branch%02"PRIuMAX string.  If we ever want to change one of
> them, we must remember to change the other to match.
>
> Perhaps with another constant, this patch would become perfect, like
> this?
>
> +               static const char fmt[] = "branch%02"PRIuMAX;
>
> > -             snprintf(buf, sizeof(buf), "branch%02"PRIuMAX, (uintmax_t)i);
> > -             refs[i].refname = xstrdup(buf);
> > +             refs[i].refname = xstrfmt("branch%02"PRIuMAX, (uintmax_t)i);
>
> +               refs[i].refname = xstrfmt(fmt, (uintmax_t)i);
>
> >               refs[i].update_index = i + 1;
> >               refs[i].value_type = REFTABLE_REF_VAL1;
> >               t_reftable_set_hash(refs[i].value.val1, i, GIT_SHA1_FORMAT_ID);
> >
> > -             logs[i].refname = xstrdup(buf);
> > +             logs[i].refname = xstrfmt("branch%02"PRIuMAX, (uintmax_t)i);
>
> +               logs[i].refname = xstrfmt(fmt, (uintmax_t)i);