[Cake] [PATCH 1/2] cake: print_uint format fixes

Toke Høiland-Jørgensen toke at toke.dk
Mon Mar 12 05:56:09 EDT 2018

Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk> writes:

>> On 11 Mar 2018, at 23:34, Stephen Hemminger <stephen at networkplumber.org> wrote:
>> On Sun, 11 Mar 2018 22:10:51 +0000
>> Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk> wrote:
>>> negative?
>>> Tried it, and you’d sort of guess wrong. I’ll write it up tomorrow
>>> ‘properly’ but ‘int’ is int length whereas uint is uint64 length. On
>>> big endian it goes wrong.
>>> Anyway, glad you’ve tested on something little endian. I’ll try to
>>> submit a patch upstream as requested…very busy over next 3 days
>>> doing $dayjob so may take a little while. Thanks for boosting
>>> confidence that I’ve not broken it on architectures it used to work
>>> on :-)
>> print_uint should be unsigned only.
>> When printing json your version won't work with negative values.
> Yes, it should be: print_int(PRINT_ANY, "overhead", "overhead %d ",
> overhead); - certainly that works on my 32 bit big endian box.

Yeah, this is fixed in the tc-adv git repo now :)

> Using the ‘PRId64’ macro won’t work because print_int is using ‘int’
> type internally whereas print_uint uses ‘uint64_t’ internally. So the
> format string has to have knowledge of the internal format, *but*
> there’s no clue of the difference in internal format offered by the
> function name i.e. print_int vs print_uint.
> I’d argue it makes more sense to have: print_int/print_uint as the
> native int length, that hopefully match up with %u & %d and then have
> print_int64/print_uint64 where use of formats PRId64 & PRIu64 is
> advised.

Yes, this was basically what I meant by "grating"; I really do agree
that this API is confusing.

Stephen, would you accept patches to fix the API (to add
print_{u,}int64() variants and turn print_uint() into native-int size)?
Or should we stick with the API currently there and live with the
inconsistency? :)


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