From 55a39399ffe8eee0e7a3fca6d44112523cd2719c Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 30 May 2016 05:18:16 +0000
Subject: variable.c: check length

* variable.c (check_autoload_required): check length first before
  checking the first byte.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55207 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

diff --git a/variable.c b/variable.c
index 849be3a..d31066e 100644
--- a/variable.c
+++ b/variable.c
@@ -2028,7 +2028,7 @@ check_autoload_required(VALUE mod, ID id, const char **loadingpath)
     }
     file = ele->feature;
     Check_Type(file, T_STRING);
-    if (!RSTRING_PTR(file) || !*RSTRING_PTR(file)) {
+    if (!RSTRING_LEN(file) || !*RSTRING_PTR(file)) {
 	rb_raise(rb_eArgError, "empty file name");
     }
     loading = RSTRING_PTR(file);
-- 
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