[systemd-devel] [systemd-commits] src/network

[Dave Reisner]

On Tue, Nov 26, 2013 at 12:40:05AM +0100, Lennart Poettering wrote:
> On Mon, 25.11.13 15:20, Dave Reisner (dreisner at kemper.freedesktop.org) wrote:
> 
> >     uint64_t can be formatted correctly with %ju, rather than casting to
> >     unsigned and potentially losing accuracy.
> 
> Oh, shouldn't we be careful with that? %j is for intmax_t. Which might
> or might not be int64_t. Given that int128_t is already on the horizon
> (newer gcc already support __int128 on 64bit machines...), I wouldn't be
> surprised if intmax_t is growing to 128bit eventually.

How do you change sizeof(uintmax_t) without breaking ABI?

> Format strings don't really have a nice way to print fixed-size
> integers I fear... the only stuff that is correct is the "PRIu64" macro,
> but that's fricking ugly...
> 
> I think PRIu64 is still a better, more future-proof option than %j though...

Assuming uintmax_t really does increase in size, no type promotion, and
someone actually manages to conjure up a system with 4 billion
interfaces...