[Ninux-Wireless] problem with big integer on openwrt

[Gioacchino Mazzurco]

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!

If i put the same command in my gentoo bash shell i obtain  4294967295 that
is the good value how to fix this ?
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Re: [Ninux-Wireless] problem with big integer on openwrt

[Luca Dionisi]

I think awk could be the point.
My system (ubuntu) gives the correct answer.

l...@luca-laptop:~$ which awk
/usr/bin/awk
l...@luca-laptop:~$ file /usr/bin/awk
/usr/bin/awk: symbolic link to `/etc/alternatives/awk'
l...@luca-laptop:~$ file /etc/alternatives/awk
/etc/alternatives/awk: symbolic link to `/usr/bin/gawk'
l...@luca-laptop:~$ file /usr/bin/gawk
/usr/bin/gawk: ELF 32-bit LSB executable, Intel 80386, version 1
(SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15,
stripped
l...@luca-laptop:~$ awk --version
GNU Awk 3.1.6
[...]

So, what is 'awk' in a openwrt box?
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Re: [Ninux-Wireless] problem with big integer on openwrt

[Gioacchino Mazzurco]

The problem is not Openwrt but awk that cannot handle big number on small
device :(

bash can than i fixed with this

printf %d\n $(( (`echo 255.255.255.255 | awk -F\. '{printf %d,
($4)}'`)+ (256*`echo 255.255.255.255 | awk -F\. '{printf %d, ($3)}'`) +
(256*256*`echo 255.255.255.255 | awk -F\. '{printf %d, ($2)}'`) +
(256*256*256*`echo 255.255.255.255 | awk -F\. '{printf %d, ($4)}'`) ))

2010/7/15 Gioacchino Mazzurco gmazzurc...@gmail.com

 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!

 If i put the same command in my gentoo bash shell i obtain  4294967295 that
 is the good value how to fix this ?

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Re: [Ninux-Wireless] problem with big integer on openwrt

[pi...@piumalab.org]

On 07/15/2010 12:01 PM, Gioacchino Mazzurco wrote:
 The problem is not Openwrt but awk that cannot handle big number on small
 device :(

 bash can than i fixed with this

 printf %d\n $(( (`echo 255.255.255.255 | awk -F\. '{printf %d,
 ($4)}'`)+ (256*`echo 255.255.255.255 | awk -F\. '{printf %d, ($3)}'`) +
 (256*256*`echo 255.255.255.255 | awk -F\. '{printf %d, ($2)}'`) +
 (256*256*256*`echo 255.255.255.255 | awk -F\. '{printf %d, ($4)}'`) ))


Also, Try this command:

echo 255.255.255.255 | awk -F\. '{printf 
$4+$3*256+$2*256*256+$1*256*256*256\n}' | bc

-- 
Il Piuma
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