diff options
Diffstat (limited to 'lua/inet')
| -rw-r--r-- | lua/inet/core.lua | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/lua/inet/core.lua b/lua/inet/core.lua index f1c7c49..15dd0f9 100644 --- a/lua/inet/core.lua +++ b/lua/inet/core.lua @@ -6,6 +6,7 @@ local format = string.format local floor = math.floor local min = math.min local max = math.max +local pow = math.pow local insert = table.insert local lshift = bit32.lshift @@ -55,6 +56,16 @@ end inet4.__len = inet.__len inet6.__len = inet.__len +function inet:subnets(n) + if type(n) ~= 'number' then return nil, 'n must be a number' end + local hostmask = is_inet6(self) and 128 or 32 + if n < 0 or n > hostmask then return nil, 'invalid mask given' end + local mask = self.mask + local bits = n - mask + local subnets = pow(2, bits) + return subnets +end + function inet:family() local mt = assert(getmetatable(self)) return assert(mt2fam[mt]) @@ -329,7 +340,7 @@ function inet4:__sub(n) end function inet4:__mul(n) - local new = self.bip + (n * math.pow(2, 32 - self.mask)) + local new = self.bip + (n * pow(2, 32 - self.mask)) return new_inet4(new, self.mask) end |