Bash - 46
Table of content
You will find 4 differently golfed version:
echo $[_=32,`printf "%d<<(_-=8)|" ${1//./ }`0] # 46chr
set -- ${1//./ };echo $[$1<<24|$2<<16|$3<<8|$4] # 47chr
v=('|%d<<'{24,16,8,0});printf -vv "${v[*]}" ${1//./ };echo $[0$v] # 65chr
mapfile -td. i<<<$1;for((a=o=0;a<4;o+=i[a]<<(3-a++)*8)){ :;};echo $o # 68chr
New version! 2018-11-15 More golfed, 46 char
echo $[_=32,`printf "%d<<(_-=8)|" ${1//./ }`0]
Explanation
- I used
$_ for more golfing.
- Syntax
${1//./ }will substitute every dots . by spaces
- so
printfwill render something like 192<<(_-=8)|168<<(_-=8)|1<<(_-=8)|1<<(_-=8)|
- then we will add a
0 after last OR | and
- preset
_ to 32. bash will read construct from left to right, so $((_-=8)) make 24 at 1st shift, 16 on second, and so on.
in action:
set -- 192.168.1.1
echo $[_=32,`printf "%d<<(_-=8)|" ${1//./ }`0]
3232235777
For fun: trying to get $_ content, after this:
echo $_
3232235777
;-b
set -- 192.168.1.1
echo $_ $[_=32,`printf "%d<<(_-=8)|" ${1//./ }`0] $_
192.168.1.1 3232235777 0
Ok, that's correct 32 - 4 x 8 = 0
In a function:
ip2int() {
echo $[_=32,`printf "%d<<(_-=8)|" ${1//./ }`0]
}
ip2int 192.168.1.1
3232235777
ip2int 255.255.255.255
4294967295
ip2int 0.0.0.0
0
or into a loop: -> 60
ip2int() {
for i;do
echo $[_=32,`printf "%d<<(_-=8)|" ${i//./ }`0]
done
}
ip2int 192.168.1.1 10.10.104.36 8.8.8.8 1.1.1.1 255.255.255.255 0.0.0.0
3232235777
168454180
134744072
16843009
4294967295
0
bash (v4.1+): 47
First post
set -- ${1//./ };echo $[$1<<24|$2<<16|$3<<8|$4]
Explanation:
- Syntax
${1//./ }will substitute every dots . by spaces
set -- set positional parameters ($@=($1 $2 $3...))- So
set -- ${1//./ } will split $1 by dots and set $1, $2, $3 and $4 if string containg 3 dots (and no spaces).
in action:
set -- 192.168.1.1
set -- ${1//./ };echo $[$1<<24|$2<<16|$3<<8|$4]
3232235777
or in a function:
ip2int() {
set -- ${1//./ }
echo $[$1<<24|$2<<16|$3<<8|$4]
}
ip2int 192.168.1.1
3232235777
ip2int 0.0.0.0
0
or into a loop: -> 61
for i;do set -- ${i//./ };echo $[$1<<24|$2<<16|$3<<8|$4];done
in action:
ip2int() {
for i;do
set -- ${i//./ }
echo $[$1<<24|$2<<16|$3<<8|$4]
done
}
ip2int 192.168.1.1 10.10.104.36 8.8.8.8 1.1.1.1 0.0.0.0
3232235777
168454180
134744072
16843009
0
Another version differently golfed: 65
v=('|%d<<'{24,16,8,0});printf -vv "${v[*]}" ${1//./ };echo $[0$v]
Sample:
ip2int() {
v=('|%d<<'{24,16,8,0});printf -vv "${v[*]}" ${1//./ };echo $[0$v]
}
ip2int 255.255.255.255
4294967295
ip2int 10.10.104.36
168454180
In a loop (+14): 82
ip2int() {
for i;do
v=('|%d<<'{24,16,8,0})
printf -vv "${v[*]}" ${1//./ }
echo $[0$v]
done
}
* or a little more ugly: 70*
v=('|%d<<'{24,16,8});printf -vv "${v[*]}" ${1//./ };echo $[0${v%<<2*}]
where printf give some string like |192<<24 |168<<16 |1<<8|1<<24 |0<<16 |0<<8 we have to cut at last <<2....
golfed with mapfile, longer: 68
ip2int() {
mapfile -td. i<<<$1;for((a=o=0;a<4;o+=i[a]<<(3-a++)*8)){ :;};echo $o
}
or with loop: 82
ip2int() {
for a;do
mapfile -td. i<<<$a;for((a=o=0;a<4;o+=i[a]<<(3-a++)*8)){ :;};echo $o
done
}
2I think this would be better if there was a restriction in place prohibiting a language's built-in functions. – Nathan Osman – 2011-02-06T20:04:20.747
@George - Yea, it would have been, but people had already done it before the I could put that in - I honestly didn't think about it. – Kyle Rozendo – 2011-02-07T05:51:43.700