On 16 Dec 2016, at 20:31, Baptiste Daroussin <b...@freebsd.org> wrote: > > On Fri, Dec 16, 2016 at 01:44:51AM +0000, Conrad E. Meyer wrote: >> Author: cem >> Date: Fri Dec 16 01:44:50 2016 >> New Revision: 310138 >> URL: https://svnweb.freebsd.org/changeset/base/310138 >> >> Log: >> vfprintf(3): Add support for kernel %b format >> >> This is a direct port of the kernel %b format. >> >> I'm unclear on if (more) non-portable printf extensions will be a >> problem. I think it's desirable to have userspace formats include all >> kernel formats, but there may be competing goals I'm not aware of. >> >> Reviewed by: no one, unfortunately >> Sponsored by: Dell EMC Isilon >> Differential Revision: https://reviews.freebsd.org/D8426 >> > > I really don't think it is a good idea, if used in userland it would be make > more of our code difficult to port elsewhere.
Indeed, this is a bad idea. These custom format specifiers should be eliminated, not multiplied. :-) > Other than that, it makes more difficult to use vanilla gcc with out userland. > and it is adding more complexity to be able to build freebsd from a non > freebsd > system which some people are working on. > > Personnaly I would prefer to see those extensions removed from the kernel > rather > than see them available in userland. Same here. > Can't we use simple helper function instead? Yes, please. Just take the snprintb(3) function from NetBSD: http://netbsd.gw.com/cgi-bin/man-cgi?snprintb+3+NetBSD-current -Dimitry
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