io.c: chomp CR at the end of read buffer

* io.c (rb_io_getline_fast): chomp CR followed by LF but separated
  by the read buffer boundary.  [ruby-core:91707] [Bug #15642]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67188 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 13 insertions, 0 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index c83dc1c30d..f646c41a69 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -233,6 +233,19 @@ class TestIO < Test::Unit::TestCase
       assert_nil r.gets
       r.close
     end)
+
+    (0..3).each do |i|
+      pipe(proc do |w|
+        w.write("a" * ((4096 << i) - 4), "\r\n" "a\r\n")
+        w.close
+      end,
+      proc do |r|
+        r.gets
+        assert_equal "a", r.gets(chomp: true)
+        assert_nil r.gets
+        r.close
+      end)
+    end
   end
 
   def test_gets_chomp_rs_nil