io.c: truncate before appending

* io.c (read_all): truncate the buffer before appending read data,
  instead of truncating before reading.
  [ruby-core:55951] [Bug #8625]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46372 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 13 insertions, 0 deletions

diff --git a/test/ruby/test_pipe.rb b/test/ruby/test_pipe.rb
index 34f231ad8c..bcea91bebb 100644
--- a/test/ruby/test_pipe.rb
+++ b/test/ruby/test_pipe.rb
@@ -13,4 +13,17 @@ class TestPipe < Test::Unit::TestCase
       r.close
     end
   end
+  class WithConversion < self
+    def open_file(content)
+      r, w = IO.pipe
+      w << content
+      w.close
+      r.set_encoding("us-ascii:utf-8")
+      begin
+        yield r
+      ensure
+        r.close
+      end
+    end
+  end
 end