From 84f677d2f38f596f71d6aea54ba2da68f4f60855 Mon Sep 17 00:00:00 2001
From: naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 7 Oct 2008 07:50:43 +0000
Subject: * ext/json/lib/json/pure/generator.rb (utf8_to_json):  
 force_encoding before gsub.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@19704 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/json/lib/json/pure/generator.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'ext/json/lib')

diff --git a/ext/json/lib/json/pure/generator.rb b/ext/json/lib/json/pure/generator.rb
index b44e42ac41..abc24bf72d 100644
--- a/ext/json/lib/json/pure/generator.rb
+++ b/ext/json/lib/json/pure/generator.rb
@@ -40,8 +40,8 @@ module JSON
   # Convert a UTF8 encoded Ruby string _string_ to a JSON string, encoded with
   # UTF16 big endian characters as \u????, and return it.
   def utf8_to_json(string) # :nodoc:
-    string = string.gsub(/["\\\/\x0-\x1f]/) { MAP[$&] }
-    string.force_encoding(Encoding::ASCII_8BIT)
+    string = string.dup.force_encoding(Encoding::ASCII_8BIT)
+    string.gsub!(/["\\\/\x0-\x1f]/) { MAP[$&] }
     string.gsub!(/(
                     (?:
                       [\xc2-\xdf][\x80-\xbf]    |
-- 
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