Bytewise increment function in Lua

byte_inc.lua

b = { 0, 0, 0, 0, 0, 0, 0, 0 }

function byte_inc(b)
    local c = 1
    for i = 1, 8 do
        local new = (b[i] + c) % 0xFF
        c = math.floor((b[i] + c) / 0xFF)
        b[i] = new
        if c == 0 then
            break
        end
    end
    return b
end