diff options
Diffstat (limited to 'package/base-files/files/bin/ipcalc.sh')
| -rwxr-xr-x | package/base-files/files/bin/ipcalc.sh | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/package/base-files/files/bin/ipcalc.sh b/package/base-files/files/bin/ipcalc.sh index 318980e5a2..e4826672e8 100755 --- a/package/base-files/files/bin/ipcalc.sh +++ b/package/base-files/files/bin/ipcalc.sh @@ -1,6 +1,27 @@ #!/bin/sh awk -f /usr/lib/common.awk -f - $* <<EOF +function bitcount(c) { + c=and(rshift(c, 1),0x55555555)+and(c,0x55555555) + c=and(rshift(c, 2),0x33333333)+and(c,0x33333333) + c=and(rshift(c, 4),0x0f0f0f0f)+and(c,0x0f0f0f0f) + c=and(rshift(c, 8),0x00ff00ff)+and(c,0x00ff00ff) + c=and(rshift(c,16),0x0000ffff)+and(c,0x0000ffff) + return c +} + +function ip2int(ip) { + for (ret=0,n=split(ip,a,"\."),x=1;x<=n;x++) ret=or(lshift(ret,8),a[x]) + return ret +} + +function int2ip(ip,ret,x) { + ret=and(ip,255) + ip=rshift(ip,8) + for(;x<3;ret=and(ip,255)"."ret,ip=rshift(ip,8),x++); + return ret +} + BEGIN { ipaddr=ip2int(ARGV[1]) netmask=ip2int(ARGV[2]) |