On Thu, Jul 15, 2010 at 12:00:04PM +0200, [email protected] wrote: > Hey all I have a big problem with openwrt! > > In a bash shell if i write this command > printf "%d\n" "`echo "255.255.255.255" | awk -F\. '{printf "%d", > ($4)+($3*256)+($2*256*256)+($1*256*256*256)}'`" > i obtain > 2147483647 > that is wrong!
The question here would be WHAT exactly is wrong here ;) Probably not this shell... %d is a format string for a _signed_ integer, not the unsigned expression that is being evaluated here. And with common systems an integer value is specified as 32bit, resulting in this INT_MAX value for any values _larger_ than that. > If i put the same command in my gentoo bash shell i obtain 4294967295 that > is the good value how to fix this ? %u would fix that, or perhaps better use %lu (or better %llu?) for higher probability to get the correct value. OTOH since an IPv4 address will always remain 32bit, %u is fully sufficient and thus the exactly adapted and proper solution. HTH, Andreas Mohr _______________________________________________ openwrt-devel mailing list [email protected] https://lists.openwrt.org/mailman/listinfo/openwrt-devel
