Avoid list iteration in dynInterface_nrOfMethods.

libs/dfi/gtest/descriptors/example6.descriptor

@@ -1,9 +1,9 @@
 :header
 type=interface
-name=example6
+name=calculator
 version=1.0.0
 :annotations
+classname=org.example.Calculator
 :types
-CptData={Dt[D#v1=1;#v2=2;E d t s e}
+StatsResult={DDD[D average min max input}
 :methods
-compatibility=cpt(#am=handle;PLCptData;#am=out;*LCptData;)N

libs/dfi/gtest/src/dyn_interface_tests.cpp

@@ -258,3 +258,27 @@ TEST_F(DynInterfaceTests, testInvalid) {
     testInvalid();
 }
 
+
+TEST_F(DynInterfaceTests, testEmptyMethod) {
+    int status = 0;
+    dyn_interface_type *dynIntf = NULL;
+    FILE *desc = fopen("descriptors/example6.descriptor", "r");
+    assert(desc != NULL);
+    status = dynInterface_parse(desc, &dynIntf);
+    ASSERT_EQ(0, status);
+    fclose(desc);
+
+    const char *name = dynInterface_getName(dynIntf);
+    ASSERT_STREQ("calculator", name);
+
+    checkInterfaceVersion(dynIntf,"1.0.0");
+
+    const struct methods_head* list = dynInterface_methods(dynIntf);
+    ASSERT_TRUE(list != NULL);
+
+    int count = dynInterface_nrOfMethods(dynIntf);
+    ASSERT_EQ(0, count);
+
+    dynInterface_destroy(dynIntf);
+}
+

libs/dfi/src/dyn_interface.c

@@ -184,10 +184,6 @@ const struct methods_head* dynInterface_methods(const dyn_interface_type* intf)
 }
 
 int dynInterface_nrOfMethods(const dyn_interface_type* intf) {
-    int count = 0;
-    struct method_entry* entry = NULL;
-    TAILQ_FOREACH(entry, &intf->methods, entries) {
-        count +=1;
-    }
-    return count;
+    struct method_entry* last = TAILQ_LAST(&intf->methods, methods_head);
+    return last == NULL ? 0 : (last->index+1);
 }