Date: Tue, 31 Mar 2009 08:55:48 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Daniel Eischen <deischen@freebsd.org>, FreeBSD Arch <arch@freebsd.org>, Tim Kientzle <kientzle@freebsd.org>, Marcel Moolenaar <xcllnt@mac.com> Subject: Re: On errno Message-ID: <20090331065548.GA3851@onelab2.iet.unipi.it> In-Reply-To: <96314.1238481987@critter.freebsd.dk> References: <20090331064959.GA3516@onelab2.iet.unipi.it> <96314.1238481987@critter.freebsd.dk>
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On Tue, Mar 31, 2009 at 06:46:27AM +0000, Poul-Henning Kamp wrote: > In message <20090331064959.GA3516@onelab2.iet.unipi.it>, Luigi Rizzo writes: > > >we are probably digressing but printf in glibc has specifiers to > >indicate which argument you want to use for each format. > > > >http://www.gnu.org/software/hello/manual/libc/Output-Conversion-Syntax.html > > > >I suppose this takes an extra pass over the format string to collect > >the proper type info for all arguments, so it is not > >not a dramatic change in the implementation of *printf. > > Yeah, we have that crap too, and you can see how messy and slow our > printf became as a result in SVN. I have never run performance tests of printf, but it woudld be definitely interesting to figure out how expensive is the parsing of the format specifiers. cheers luigi
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