vfprintf() string precision type
Sean C. Farley
scf at FreeBSD.org
Mon Sep 17 16:35:39 PDT 2007
On Mon, 17 Sep 2007, Harti Brandt wrote:
> On Sun, 16 Sep 2007, Sean C. Farley wrote:
>
> SCF>Xin LI noticed a warning in the code I wrote for setenv() where a
> SCF>precision was provided with a string argument to warnx() (really
> SCF>vfprintf()). The warning appearing on amd64 and not i386 showed
> SCF>that precisions are always 32-bit.
> SCF>
> SCF>Would it be better to change the precision handling to expect
> SCF>size_t? My reasoning is that strlen() and sizeof both return
> SCF>size_t. It makes a cast unnecessary for passing a value returned
> SCF>by either call as the precision. Unfortunately, I could find
> SCF>nothing from SUSv3 that specified what type the precision could
> SCF>be.
>
> The argument to the %.*f is specified to be an int (7.19.6.1/5) so I
> would assume that internal handling in printf() also uses int.
> Paragraph 4 of the above section talks about the precision as 'an
> optional decimal integer'. Well, one could interpret this to mean int,
> but need not to.
Yes, I see your point. It should be int, but it would be nice for the
spec to say size_t. :)
> PS: Not sure that I got your question right :-)
You did. Thank you.
Sean
--
scf at FreeBSD.org
More information about the freebsd-standards
mailing list