| 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 | } |
| 27 | |
