forgot to commit openos

data/openos/lib/uuid.lua

@@ -0,0 +1,30 @@
+local bit32 = require("bit32")
+local uuid = {}
+
+function uuid.next()
+  -- e.g. 3c44c8a9-0613-46a2-ad33-97b6ba2e9d9a
+  -- 8-4-4-4-12 (halved sizes because bytes make hex pairs)
+  local sets = {4, 2, 2, 2, 6}
+  local result = ""
+  local pos = 0
+
+  for _,set in ipairs(sets) do
+    if result:len() > 0 then
+      result = result .. "-"
+    end
+    for _ = 1,set do
+      local byte = math.random(0, 255)
+      if pos == 6 then
+        byte = bit32.bor(bit32.band(byte, 0x0F), 0x40)
+      elseif pos == 8 then
+        byte = bit32.bor(bit32.band(byte, 0x3F), 0x80)
+      end
+      result = result .. string.format("%02x", byte)
+      pos = pos + 1
+    end
+  end
+
+  return result
+end
+
+return uuid