From 66de9ef3496793095176fb9cfa12480d7386b379 Mon Sep 17 00:00:00 2001
From: matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 22 Jun 2006 01:39:44 +0000
Subject: * string.c (rb_str_aref): "abc"[3] should not return an empty  
 string but nil.  [ruby-dev:28786]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@10363 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 string.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'string.c')

diff --git a/string.c b/string.c
index f254915f9b..136235580c 100644
--- a/string.c
+++ b/string.c
@@ -1478,6 +1478,12 @@ rb_str_aref(VALUE str, VALUE indx)
 	idx = FIX2LONG(indx);
 
       num_index:
+	if (idx < 0) {
+	    idx = RSTRING(str)->len + idx;
+	}
+	if (idx < 0 || RSTRING(str)->len <= idx) {
+	    return Qnil;
+	}
 	return rb_str_substr(str, idx, 1);
 
       case T_REGEXP:
-- 
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