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/* go-eface-compare.c -- compare two empty values.

   Copyright 2010 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 "runtime.h"

#include "interface.h"

/* Compare two interface values.  Return 0 for equal, not zero for not

   equal (return value is like strcmp).  */

int

__go_empty_interface_compare (struct __go_empty_interface left,

                              struct __go_empty_interface right)

{

  const struct __go_type_descriptor *left_descriptor;

  left_descriptor = left.__type_descriptor;

  if (((uintptr_t) left_descriptor & reflectFlags) != 0

      || ((uintptr_t) right.__type_descriptor & reflectFlags) != 0)

    runtime_panicstring ("invalid interface value");

  if (left_descriptor == NULL && right.__type_descriptor == NULL)

    return 0;

  if (left_descriptor == NULL || right.__type_descriptor == NULL)

    return 1;

  if (!__go_type_descriptors_equal (left_descriptor,

                                    right.__type_descriptor))

    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;

}