merges r25127 from trunk into ruby_1_9_1.

--
* stringio/stringio.c (strio_read): set ASCII-8BIT encoding
  when length argument is given.

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_1@25952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

4 files changed, 13 insertions, 5 deletions

diff --git a/ChangeLog b/ChangeLog
index 431cf4690..c4359e16f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Sep 28 10:06:38 2009  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* stringio/stringio.c (strio_read): set ASCII-8BIT encoding
+	  when length argument is given.
+
 Sun Sep 27 13:06:43 2009  Tanaka Akira  <akr@fsij.org>
 
 	* lib/pp.rb (PP:ObjectMixin#pretty_print): delegates has no inspect
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index 4e24a4723..474db5df5 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -1137,7 +1137,7 @@ strio_read(int argc, VALUE *argv, VALUE self)
 {
     struct StringIO *ptr = readable(StringIO(self));
     VALUE str = Qnil;
-    long len, olen;
+    long len;
 
     switch (argc) {
       case 2:
@@ -1146,7 +1146,7 @@ strio_read(int argc, VALUE *argv, VALUE self)
 	rb_str_modify(str);
       case 1:
 	if (!NIL_P(argv[0])) {
-	    len = olen = NUM2LONG(argv[0]);
+	    len = NUM2LONG(argv[0]);
 	    if (len < 0) {
 		rb_raise(rb_eArgError, "negative length %ld given", len);
 	    }
@@ -1158,7 +1158,6 @@ strio_read(int argc, VALUE *argv, VALUE self)
 	}
 	/* fall through */
       case 0:
-	olen = -1;
 	len = RSTRING_LEN(ptr->string);
 	if (len <= ptr->pos) {
 	    if (NIL_P(str)) {
@@ -1178,6 +1177,7 @@ strio_read(int argc, VALUE *argv, VALUE self)
     }
     if (NIL_P(str)) {
 	str = strio_substr(ptr, ptr->pos, len);
+	if (argc > 0) rb_enc_associate(str, rb_ascii8bit_encoding());
     }
     else {
 	long rest = RSTRING_LEN(ptr->string) - ptr->pos;
diff --git a/test/stringio/test_stringio.rb b/test/stringio/test_stringio.rb
index 4d1fdf28d..01bdbaa6d 100644
--- a/test/stringio/test_stringio.rb
+++ b/test/stringio/test_stringio.rb
@@ -384,9 +384,12 @@ class TestStringIO < Test::Unit::TestCase
   end
 
   def test_read
-    f = StringIO.new("1234")
+    f = StringIO.new("\u3042\u3044")
     assert_raise(ArgumentError) { f.read(-1) }
     assert_raise(ArgumentError) { f.read(1, 2, 3) }
+    assert_equal("\u3042\u3044", f.read)
+    f.rewind
+    assert_equal("\u3042\u3044".force_encoding(Encoding::ASCII_8BIT), f.read(f.size))
   end
 
   def test_size
diff --git a/version.h b/version.h
index 86e78cb8e..8453c579a 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.1"
-#define RUBY_PATCHLEVEL 353
+#define RUBY_PATCHLEVEL 354
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 9
 #define RUBY_VERSION_TEENY 1