Check if closed after each yield [Bug #17661]

io.c

@@ -4052,9 +4052,9 @@ rb_io_each_byte(VALUE io)
 	    char *p = fptr->rbuf.ptr + fptr->rbuf.off++;
 	    fptr->rbuf.len--;
 	    rb_yield(INT2FIX(*p & 0xff));
+	    rb_io_check_byte_readable(fptr);
 	    errno = 0;
 	}
-	rb_io_check_byte_readable(fptr);
 	READ_CHECK(fptr);
     } while (io_fillbuf(fptr) >= 0);
     return io;
@@ -4271,6 +4271,7 @@ rb_io_each_codepoint(VALUE io)
 	    fptr->cbuf.off += n;
 	    fptr->cbuf.len -= n;
 	    rb_yield(UINT2NUM(c));
+            rb_io_check_byte_readable(fptr);
 	}
     }
     NEED_NEWLINE_DECORATOR_ON_READ_CHECK(fptr);
@@ -4308,6 +4309,7 @@ rb_io_each_codepoint(VALUE io)
 	else {
 	    continue;
 	}
+        rb_io_check_byte_readable(fptr);
     }
     return io;
 

test/ruby/test_io.rb

@@ -394,6 +394,24 @@ class TestIO < Test::Unit::TestCase
     }
   end
 
+  def test_each_byte_closed
+    pipe(proc do |w|
+      w << "abc def"
+      w.close
+    end, proc do |r|
+      assert_raise(IOError) do
+        r.each_byte {|byte| r.close if byte == 32 }
+      end
+    end)
+    make_tempfile {|t|
+      File.open(t, 'rt') {|f|
+        assert_raise(IOError) do
+          f.each_byte {|c| f.close if c == 10}
+        end
+      }
+    }
+  end
+
   def test_each_codepoint
     make_tempfile {|t|
       bug2959 = '[ruby-core:28650]'
@@ -405,6 +423,24 @@ class TestIO < Test::Unit::TestCase
     }
   end
 
+  def test_each_codepoint_closed
+    pipe(proc do |w|
+      w.print("abc def")
+      w.close
+    end, proc do |r|
+      assert_raise(IOError) do
+        r.each_codepoint {|c| r.close if c == 32}
+      end
+    end)
+    make_tempfile {|t|
+      File.open(t, 'rt') {|f|
+        assert_raise(IOError) do
+          f.each_codepoint {|c| f.close if c == 10}
+        end
+      }
+    }
+  end
+
   def test_rubydev33072
     t = make_tempfile
     path = t.path