There is no sane way to get sscanf to tell you how many characters 
were consumed, if you want to allow a variable number of arguments.
 
The special format %n is patently useless for this, because you 
have to insert it at every conceiveable point in the string and
that presumes full explicit whitespace markup.
 
Parse -w argument "by hand", to catch illegal input like "1,INF,15"
 
Tripped over by:        Stein Ove Rosseland <steinove@vg.no>
 
Fixes:  ticket #82



git-svn-id: http://www.varnish-cache.org/svn/trunk@1239 d4fa192b-c00b-0410-8231-f00ffab90ce4