On errno

[Luigi Rizzo]

On Tue, Mar 31, 2009 at 06:46:27AM +0000, Poul-Henning Kamp wrote:
> In message <20090331064959.GA3516 at 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