naruse	2012-02-15 17:45:15 +0900 (Wed, 15 Feb 2012)

  New Revision: 34624

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=34624

  Log:
    * io.c (io_strsetbuf): call rb_str_modify to make str independent
      before calling rb_str_set_len for r34580.

  Modified files:
    trunk/ChangeLog
    trunk/io.c

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 34623)
+++ ChangeLog	(revision 34624)
@@ -1,3 +1,8 @@
+Wed Feb 15 17:41:31 2012  NARUSE, Yui  <naruse@r...>
+
+	* io.c (io_strsetbuf): call rb_str_modify to make str independent
+	  before calling rb_str_set_len for r34580.
+
 Wed Feb 15 12:30:10 2012  Eric Hodel  <drbrain@s...>
 
 	* ext/zlib/zlib.c (Init_zlib):  Added Zlib::TEXT and note that
Index: io.c
===================================================================
--- io.c	(revision 34623)
+++ io.c	(revision 34624)
@@ -2084,7 +2084,10 @@
 	VALUE s = StringValue(*str);
 	long clen = RSTRING_LEN(s);
 	if (clen >= len) {
-	    if (clen != len) rb_str_set_len(s, len);
+	    if (clen != len) {
+		rb_str_modify(s);
+		rb_str_set_len(s, len);
+	    }
 	    return;
 	}
 	len -= clen;

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