Johannes Schindelin <johannes.schindelin@xxxxxx> writes:
> So let's introduce the pseudo format "PRItime" (currently simply being
> "lu") so that it is easy later on to change the data type to time_t.
The problem being solved is a good thing to solve, and
> - printf("author-time %lu\n", ci.author_time);
> + printf("author-time %"PRItime"\n", ci.author_time);
is one of the two ingredients to the solution for this line. But
the final form would require casting ci.author_time to the type
expected by %PRItime format specifier. With this change alone, you
could define PRItime to expect an winder type in the next step but
that would be a bad conversion. IOW, changing only the format
without introducing an explicit cast appears to invite future
mistakes.
It would be better to introduce the timestamp_t we discussed earlier
before (or at) this step, and typedef it to ulong first, and then in
this step, change the above to
printf("author-time %"PRItime"\n", (timestamp_t)ci.author_time);
to keep them in sync. And at a later step in the series, you can
update definition of PRItime and timestamp_t to make them wider at
the same time, and the changes in this patch like the above line
would not need to be touched again.