From 0a4049767a2f9faf27f17d71325943eb82209b95 Mon Sep 17 00:00:00 2001
From: Erant <stuff@things.com>
Date: Sat, 14 Mar 2015 09:00:25 -0700
Subject: [PATCH] Fix getFSF to abide by the function contract

---
 app/lua/lauxlib.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/app/lua/lauxlib.c b/app/lua/lauxlib.c
index fedd7c56..e9f8f30a 100644
--- a/app/lua/lauxlib.c
+++ b/app/lua/lauxlib.c
@@ -659,13 +659,19 @@ typedef struct LoadFSF {
 static const char *getFSF (lua_State *L, void *ud, size_t *size) {
   LoadFSF *lf = (LoadFSF *)ud;
   (void)L;
+
+  if (L == NULL && size == NULL) // Direct mode check
+    return NULL;
+
   if (lf->extraline) {
     lf->extraline = 0;
     *size = 1;
     return "\n";
   }
+
   if (fs_eof(lf->f)) return NULL;
   *size = fs_read(lf->f, lf->buff, sizeof(lf->buff));
+
   return (*size > 0) ? lf->buff : NULL;
 }