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36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
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/* go-interface-eface-compare.c -- compare non-empty and empty interface.
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Copyright 2011 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include "runtime.h"
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#include "interface.h"
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/* Compare a non-empty interface value with an empty interface value.
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Return 0 for equal, not zero for not equal (return value is like
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strcmp). */
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int
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__go_interface_empty_compare (struct __go_interface left,
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struct __go_empty_interface right)
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{
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const struct __go_type_descriptor *left_descriptor;
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if (((uintptr_t) right.__type_descriptor & reflectFlags) != 0)
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runtime_panicstring ("invalid interface value");
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if (left.__methods == NULL && right.__type_descriptor == NULL)
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return 0;
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if (left.__methods == NULL || right.__type_descriptor == NULL)
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return 1;
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left_descriptor = left.__methods[0];
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if (!__go_type_descriptors_equal (left_descriptor, right.__type_descriptor))
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return 1;
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if (__go_is_pointer_type (left_descriptor))
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return left.__object == right.__object ? 0 : 1;
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if (!left_descriptor->__equalfn (left.__object, right.__object,
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left_descriptor->__size))
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return 1;
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return 0;
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}
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