From dc59c76898a6b6c3f87ec176660cb30fb2935370 Mon Sep 17 00:00:00 2001
From: normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 4 Jan 2016 20:45:14 +0000
Subject: stringio: binmode sets encoding to ASCII-8BIT

This should match the behavior of IO#binmode as far
as treating content as ASCII-8BIT (binary).

* ext/stringio/stringio.c (strio_binmode): implement to set encoding
* test/stringio/test_stringio.rb (test_binmode): new test
  [ruby-core:72699] [Bug #11945]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53435 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/stringio/stringio.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'ext/stringio')

diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index 23c4356f97..bd83ea207b 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -493,7 +493,18 @@ strio_set_lineno(VALUE self, VALUE lineno)
     return lineno;
 }
 
-#define strio_binmode strio_self
+static VALUE
+strio_binmode(VALUE self)
+{
+    struct StringIO *ptr = StringIO(self);
+    rb_encoding *enc = rb_ascii8bit_encoding();
+
+    ptr->enc = enc;
+    if (WRITABLE(self)) {
+	rb_enc_associate(ptr->string, enc);
+    }
+    return self;
+}
 
 #define strio_fcntl strio_unimpl
 
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