merge revision(s) 20354:

	* string.c (str_independent): no independent string points null_str.
	  [ruby-core:20082]


git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_8_6@22364 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 12 insertions, 5 deletions

diff --git a/ChangeLog b/ChangeLog
index e5b10b4da..95a820238 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Feb 17 11:57:39 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* string.c (str_independent): no independent string points null_str.
+	  [ruby-core:20082]
+
 Mon Feb 16 23:25:43 2009  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
 	* ext/tk/lib/tkextlib/blt.rb, ext/tk/lib/tkextlib/blt/vector.rb: 
diff --git a/string.c b/string.c
index 7e01712bb..d625c542a 100644
--- a/string.c
+++ b/string.c
@@ -464,6 +464,8 @@ rb_str_format_m(str, arg)
     return rb_str_format(1, &arg, str);
 }
 
+static const char null_str[] = "";
+
 static int
 str_independent(str)
     VALUE str;
@@ -474,6 +476,7 @@ str_independent(str)
     if (OBJ_FROZEN(str)) rb_error_frozen("string");
     if (!OBJ_TAINTED(str) && rb_safe_level() >= 4)
 	rb_raise(rb_eSecurityError, "Insecure: can't modify string");
+    if (RSTRING(str)->ptr == null_str) return 0;
     if (!FL_TEST(str, ELTS_SHARED)) return 1;
     return 0;
 }
@@ -532,7 +535,6 @@ rb_str_associated(str)
     return Qfalse;
 }
 
-static const char null_str[] = "";
 #define make_null_str(s) do { \
 	FL_SET(s, ELTS_SHARED); \
 	RSTRING(s)->ptr = (char *)null_str; \
diff --git a/version.h b/version.h
index c5528b863..3af890168 100644
--- a/version.h
+++ b/version.h
@@ -1,15 +1,15 @@
 #define RUBY_VERSION "1.8.6"
-#define RUBY_RELEASE_DATE "2009-02-16"
+#define RUBY_RELEASE_DATE "2009-02-17"
 #define RUBY_VERSION_CODE 186
-#define RUBY_RELEASE_CODE 20090216
-#define RUBY_PATCHLEVEL 336
+#define RUBY_RELEASE_CODE 20090217
+#define RUBY_PATCHLEVEL 337
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 8
 #define RUBY_VERSION_TEENY 6
 #define RUBY_RELEASE_YEAR 2009
 #define RUBY_RELEASE_MONTH 2
-#define RUBY_RELEASE_DAY 16
+#define RUBY_RELEASE_DAY 17
 
 #ifdef RUBY_EXTERN
 RUBY_EXTERN const char ruby_version[];