From 1ebe1c8b1f11d1c2975c4370a4fd3c566132c9d7 Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Mon, 12 Jun 2017 09:32:56 +0900
Subject: Support outbuf argument for IO#read

---
 mrblib/io.rb | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/mrblib/io.rb b/mrblib/io.rb
index 694fdb0c9..4262504f2 100644
--- a/mrblib/io.rb
+++ b/mrblib/io.rb
@@ -181,7 +181,7 @@ class IO
     nil
   end
 
-  def read(length = nil)
+  def read(length = nil, outbuf = "")
     unless length.nil?
       unless length.is_a? Fixnum
         raise TypeError.new "can't convert #{length.class} into Integer"
@@ -217,7 +217,12 @@ class IO
       end
     end
 
-    array && array.join
+    if array.nil?
+      outbuf.replace("")
+      nil
+    else
+      outbuf.replace(array.join)
+    end
   end
 
   def readline(arg = $/, limit = nil)
-- 
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