From: Vladimír Čunát <vladimir.cunat@nic.cz>
Date: Mon, 15 Apr 2019 11:50:51 +0000 (+0200)
Subject: daemon/bindings: add lua_pushpointer()
X-Git-Tag: v4.0.0~4^2~16
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1e9535ffbc830332a0c06b34f11c813eeca715bf;p=thirdparty%2Fknot-resolver.git

daemon/bindings: add lua_pushpointer()

Originally it's from another branch.
---

diff --git a/daemon/bindings/impl.h b/daemon/bindings/impl.h
index af54ddc0b..c4d06c84b 100644
--- a/daemon/bindings/impl.h
+++ b/daemon/bindings/impl.h
@@ -102,3 +102,15 @@ static inline int execute_callback(lua_State *L, int argc)
 	return ret;
 }
 
+/** Push a pointer as heavy/full userdata.
+ *
+ * It's useful as a replacement of lua_pushlightuserdata(),
+ * but note that it behaves differently in lua (converts to pointer-to-pointer).
+ */
+static inline void lua_pushpointer(lua_State *L, void *p)
+{
+       void *addr = lua_newuserdata(L, sizeof(void *));
+       assert(addr);
+       memcpy(addr, &p, sizeof(void *));
+}
+