+
+typedef clib_error_t *(vat_feature_function_t) (vat_main_t * vam);
+typedef struct vat_registered_features_t
+{
+ vat_feature_function_t *function;
+ struct vat_registered_features_t *next;
+} vat_registered_features_t;
+
+
+#define VAT_REGISTER_FEATURE_FUNCTION(x) \
+ vat_registered_features_t _vat_feature_function_##x; \
+static void __vlib_add_config_function_##x (void) \
+ __attribute__((__constructor__)) ; \
+static void __vlib_add_config_function_##x (void) \
+{ \
+ vat_main_t * vam = &vat_main; \
+ _vat_feature_function_##x.next = vam->feature_function_registrations; \
+ vam->feature_function_registrations = &_vat_feature_function_##x; \
+} \
+ vat_registered_features_t _vat_feature_function_##x = \
+ { \
+ .function = x, \
+ }
+
+#if VPP_API_TEST_BUILTIN == 0
+static_always_inline uword
+api_unformat_sw_if_index (unformat_input_t *input, va_list *args)
+{
+ vat_main_t *vam = va_arg (*args, vat_main_t *);
+ u32 *result = va_arg (*args, u32 *);
+ u8 *if_name;
+ uword *p;
+
+ if (!unformat (input, "%s", &if_name))
+ return 0;
+
+ p = hash_get_mem (vam->sw_if_index_by_interface_name, if_name);
+ if (p == 0)
+ return 0;
+ *result = p[0];
+ return 1;
+}
+#endif /* VPP_API_TEST_BUILTIN */
+