1 files changed, 31 insertions, 0 deletions
diff --git a/libgo/runtime/go-interface-compare.c b/libgo/runtime/go-interface-compare.c
new file mode 100644
index 000000000..11c75e812
--- /dev/null
+++ b/libgo/runtime/go-interface-compare.c
@@ -0,0 +1,31 @@
+/* go-interface-compare.c -- compare two interface values.
+
+   Copyright 2009 The Go Authors. All rights reserved.
+   Use of this source code is governed by a BSD-style
+   license that can be found in the LICENSE file.  */
+
+#include "interface.h"
+
+/* Compare two interface values.  Return 0 for equal, not zero for not
+   equal (return value is like strcmp).  */
+
+int
+__go_interface_compare (struct __go_interface left,
+			struct __go_interface right)
+{
+  const struct __go_type_descriptor *left_descriptor;
+
+  if (left.__methods == NULL && right.__methods == NULL)
+    return 0;
+  if (left.__methods == NULL || right.__methods == NULL)
+    return 1;
+  left_descriptor = left.__methods[0];
+  if (!__go_type_descriptors_equal (left_descriptor, right.__methods[0]))
+    return 1;
+  if (__go_is_pointer_type (left_descriptor))
+    return left.__object == right.__object ? 0 : 1;
+  if (!left_descriptor->__equalfn (left.__object, right.__object,
+				   left_descriptor->__size))
+    return 1;
+  return 0;
+}