text: /* 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 "go-type.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).  */
  
  intgo
  __go_interface_empty_compare (struct __go_interface left,
  			      struct __go_empty_interface right)
  {
    const struct __go_type_descriptor *left_descriptor;
  
    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 (!__go_call_equalfn (left_descriptor->__equalfn, left.__object,
  			  right.__object, left_descriptor->__size))
      return 1;
    return 0;
  }
  