From 7a6113d6b683ab671e2476910962fbfd5e689617 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 24 Jan 2011 22:00:55 +0000
Subject: * string.c (rb_string_value_cstr): rb_str_modify can change  
 RSTRING_PTR.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30648 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 string.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'string.c')

diff --git a/string.c b/string.c
index 4e0d9fda39..9e9d911156 100644
--- a/string.c
+++ b/string.c
@@ -1392,7 +1392,11 @@ rb_string_value_cstr(volatile VALUE *ptr)
     if (!s || memchr(s, 0, len)) {
 	rb_raise(rb_eArgError, "string contains null byte");
     }
-    if (s[len]) rb_str_modify(str);
+    if (s[len]) {
+	rb_str_modify(str);
+	s = RSTRING_PTR(str);
+	s[RSTRING_LEN(str)] = 0;
+    }
     return s;
 }
 
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