[tz] localtime.c patch

Clive D.W. Feather clive at davros.org
Tue Oct 14 15:36:17 UTC 2014

Paul Eggert said:
>> I can see that POSIX says "The type
>> ssize_t shall be capable of storing values at least in the range [-1,
>> {SSIZE_MAX}].", but that doesn't exempt it from the C rules concerning
>> types.
> Well, in *theory* ssize_t could be an extended integer type using one's 
> complement and SSIZE_MAX could be 1, no?

Indeed. Note that SSIZE_MAX is a POSIX value and is not necessarily the
largest value of ssize_t.

> As far as I can tell nothing 
> in the C standard prohibits that, and that would mean one couldn't 
> necessarily store -2 into an ssize_t variable.

I was about to say that extended integer types have to at least have the
range of signed or unsigned char, as appropriate, but I can't find any such
rule. So it does seem that you could have such a type. Mutter.

> Of course this is purely a theoretical objection, but I've always been 
> suspicious of that POSIX rule about -1 and ssize_t -- the rule must be 
> there for a reason, though they don't explain the reason

I'd always assumed that that notation showed the values that POSIX puts in
variables of that type.

Clive D.W. Feather          | If you lie to the compiler,
Email: clive at davros.org     | it will get its revenge.
Web: http://www.davros.org  |   - Henry Spencer
Mobile: +44 7973 377646

More information about the tz mailing list