From ace843e3065cad2507a66a8cc13ef2888155ee16 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Petr=20=C5=A0pa=C4=8Dek?= <petr.spacek@nic.cz>
Date: Tue, 13 Oct 2020 17:53:37 +0200
Subject: [PATCH] kluautil: table pack and unpack

Helper functions for handling variable length arrays with nil values.
---
 daemon/lua/kluautil.lua | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/daemon/lua/kluautil.lua b/daemon/lua/kluautil.lua
index 0b6a114fb..b96a4bad7 100644
--- 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;
-- 
2.47.2