From: =?UTF-8?q?Beno=C3=AEt=20Burnichon?= <benoit.burnichon@airtag.com>
Date: Tue, 6 Dec 2011 14:23:53 +0100
Subject: [PATCH] io.read("*n", "*n") may return garbage if second read fails.
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Comes from http://www.lua.org/bugs.html#5.1.4-8

reported by Roberto on 12 Apr 2010.
Example:
 --
 print(io.read("*n", "*n"))   --<< enter "10   hi"
 --> file (0x884420)	nil
 --

Signed-off-by: Benoît Burnichon <benoit.burnichon@airtag.com>
---
 src/liolib.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/src/liolib.c b/src/liolib.c
index e79ed1c..8de2547 100644
--- a/src/liolib.c
+++ b/src/liolib.c
@@ -276,7 +276,10 @@ static int read_number (lua_State *L, FILE *f) {
     lua_pushnumber(L, d);
     return 1;
   }
-  else return 0;  /* read fails */
+  else {
+    lua_pushnil(L);  /* "result" to be removed */
+    return 0;  /* read fails */
+  }
 }