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/* 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;

}