1 /* go-eface-val-compare.c -- compare an empty interface with a value.
2 
3    Copyright 2010 The Go Authors. All rights reserved.
4    Use of this source code is governed by a BSD-style
5    license that can be found in the LICENSE file.  */
6 
7 #include "runtime.h"
8 #include "go-type.h"
9 #include "interface.h"
10 
11 /* Compare an empty interface with a value.  Return 0 for equal, not
12    zero for not equal (return value is like strcmp).  */
13 
14 intgo
__go_empty_interface_value_compare(struct __go_empty_interface left,const struct __go_type_descriptor * right_descriptor,const void * val)15 __go_empty_interface_value_compare (
16     struct __go_empty_interface left,
17     const struct __go_type_descriptor *right_descriptor,
18     const void *val)
19 {
20   const struct __go_type_descriptor *left_descriptor;
21 
22   left_descriptor = left.__type_descriptor;
23   if (left_descriptor == NULL)
24     return 1;
25   if (!__go_type_descriptors_equal (left_descriptor, right_descriptor))
26     return 1;
27   if (__go_is_pointer_type (left_descriptor))
28     return left.__object == val ? 0 : 1;
29   if (!__go_call_equalfn (left_descriptor->__equalfn, left.__object, val,
30 			  left_descriptor->__size))
31     return 1;
32   return 0;
33 }
34