kluautil: table pack and unpack

Helper functions for handling variable length arrays with nil values.

diff --git a/daemon/lua/kluautil.lua b/daemon/lua/kluautil.lua
index 0b6a114fb910e732f6ae212d2963a1c72fa79fe0..b96a4bad71804b3f496df3906e108772cee5360c 100644 (file)
--- a/daemon/lua/kluautil.lua
+++ b/daemon/lua/kluautil.lua
@@ -17,6 +17,18 @@ function kluautil.kr_table_len(t)
        return len
 end
 
+-- pack varargs including nil arguments into a table
+function kluautil.kr_table_pack(...)
+       local tab = {...}
+       tab.n = select('#', ...)
+       return tab
+end
+
+-- unpack table produced by kr_table_pack and including nil values
+function kluautil.kr_table_unpack(tab)
+       return unpack(tab, 1, tab.n)
+end
+
 -- Fetch over HTTPS
 ffi.cdef([[
        typedef struct __dirstream DIR;