Re: [9fans] subtracting pointers on amd64 6c

["Devon H. O'Dell" <devon.odell@gmail.com>]

2016-01-05 14:57 GMT-08:00 Devon H. O'Dell <devon.odell@gmail.com>:
> 2016-01-05 14:32 GMT-08:00  <cinap_lenrek@felloff.net>:
>>> there are usable ANSI formats for the difference and sizeof types.
>>
>> so one would write %td instead of %ld for ptrdiff type? that seems
>> easy.
>
> yes, and there's support for u/i/o/X/x/etc modifiers
>
>> i'm not so sure how usize/ssize would work. %zud and %zd? or would
>> the z flag imply unsigned? would the return type of sizeof() also
>> become usize?
>
> it depends on what you are trying to target. that's why i bring up
> standards as soon as you start talking about this. size_t and
> ptrdiff_t are part of C. ssize_t isn't.
>
> ssize_t is a posix-ism and is defined to store "values at least in the
> range [-1, {SSIZE_MAX}]". If you care about what C says, then you can
> do anything you want with ssize, because it isn't part of C. For
> printing, %zu is size_t (per C) and %zd is ssize_t (per POSIX).

I'm wrong here, %z is for size_t in general (plus modifiers including d).

> --dho
>
>> --
>> cinap
>>