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/* go-interface-eface-compare.c -- compare non-empty and empty interface.

   Copyright 2011 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 a non-empty interface value with an empty interface value.

   Return 0 for equal, not zero for not equal (return value is like

   strcmp).  */

int

__go_interface_empty_compare (struct __go_interface left,

                              struct __go_empty_interface right)

{

  const struct __go_type_descriptor *left_descriptor;

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

    runtime_panicstring ("invalid interface value");

  if (left.__methods == NULL && right.__type_descriptor == NULL)

    return 0;

  if (left.__methods == NULL || right.__type_descriptor == NULL)

    return 1;

  left_descriptor = left.__methods[0];

  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;

}