From d46748ac59c3b8d8895d2671aa4b1eca3914d1d4 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Wed, 24 Feb 2021 20:43:11 +0100
Subject: Added buffer and garbage collection to stream

---
 stream.c | 26 ++++++++++++++++++++++++--
 stream.h |  9 +++++++++
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/stream.c b/stream.c
index d6a5254..a322e2b 100644
--- a/stream.c
+++ b/stream.c
@@ -1,11 +1,13 @@
 #include "stream.h"
 
+#include <stdlib.h>
+
 #include <lauxlib.h>
 #include <lua.h>
 
 /// Creates and pushes new Stream into the Lua stack.
 /// \param L Lua state to push to
-/// \param fd File descriptor used by stream
+/// \param fd File descriptor used by the Stream
 /// \return TODO
 int stream_push_new(lua_State * L, const int fd)
 {
@@ -14,10 +16,30 @@ int stream_push_new(lua_State * L, const int fd)
 
 	if (1 == luaL_newmetatable(L, "stream"))
 	{
-		// TODO: initialize metatable for stream
+		lua_pushstring(L, "__gc");
+		lua_pushcfunction(L, stream_gc);
+		lua_rawset(L, -3);
 	}
 
 	lua_setmetatable(L, -2);
 
 	return LUA_OK;
 }
+
+/// Metamethod to handle garbage collection of Stream userdata.
+/// \param L Lua state in which Stream resides
+/// \return Always zero, which is the number of the results pushed to the stack
+int stream_gc(lua_State * L)
+{
+	struct stream * s = lua_touserdata(L, -1);
+
+	if (NULL != s)
+	{
+		if (NULL != s->in.data)
+		{
+			free(s->in.data);
+		}
+	}
+
+	return 0;
+}
diff --git a/stream.h b/stream.h
index 5762bc8..f38b6ef 100644
--- a/stream.h
+++ b/stream.h
@@ -2,9 +2,18 @@
 
 #include <lua.h>
 
+struct buffer
+{
+	char * data;
+	int length;
+	int offset;
+};
+
 struct stream
 {
 	int fd;
+	struct buffer in;
 };
 
 int stream_push_new(lua_State *, const int);
+int stream_gc(lua_State *);
-- 
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