package/base-files/files/usr/lib/common.awk

   1 # Copyright (C) 2006 OpenWrt.org
   2
   3 function bitcount(c) {
   4         c=and(rshift(c, 1),0x55555555)+and(c,0x55555555)
   5         c=and(rshift(c, 2),0x33333333)+and(c,0x33333333)
   6         c=and(rshift(c, 4),0x0f0f0f0f)+and(c,0x0f0f0f0f)
   7         c=and(rshift(c, 8),0x00ff00ff)+and(c,0x00ff00ff)
   8         c=and(rshift(c,16),0x0000ffff)+and(c,0x0000ffff)
   9         return c
  10 }
  11
  12 function validate_netmask(nm) {
  13         return and(-nm,compl(nm))
  14 }
  15
  16 function ip2int(ip) {
  17         for (ret=0,n=split(ip,a,"\."),x=1;x<=n;x++) ret=or(lshift(ret,8),a[x])
  18         return ret
  19 }
  20
  21 function int2ip(ip,ret,x) {
  22         ret=and(ip,255)
  23         ip=rshift(ip,8)
  24         for(;x<3;ret=and(ip,255)"."ret,ip=rshift(ip,8),x++);
  25         return ret
  26 }