app: Add functions to swap voicemail function table for testing purposes

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@432556 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/app.h

@@ -595,6 +595,22 @@ int __ast_vm_register(const struct ast_vm_functions *vm_table, struct ast_module
  */
 void ast_vm_unregister(const char *module_name);
 
+#ifdef TEST_FRAMEWORK
+/*!
+ * \brief Swap out existing voicemail functions with a temporary set of functions for use with unit tests
+ *
+ * \param vm_table function table to use for testing
+ *
+ * \note ast_vm_test_swap_table_out should be called to restore the original set before testing concludes
+ */
+void ast_vm_test_swap_table_in(const struct ast_vm_functions *vm_table);
+
+/*!
+ * \brief Used after ast_vm_test_swap_table_in to restore the original set of voicemail functions
+ */
+void ast_vm_test_swap_table_out(void);
+#endif
+
 #define VM_GREETER_MODULE_VERSION 1
 
 /*! \brief Voicemail greeter function table definition. */

main/app.c

@@ -519,6 +519,57 @@ void ast_vm_unregister(const char *module_name)
 	ao2_cleanup(table);
 }
 
+#ifdef TEST_FRAMEWORK
+/*! \brief Holding container for the voicemail provider used while testing */
+static AO2_GLOBAL_OBJ_STATIC(vm_provider_holder);
+static int provider_is_swapped = 0;
+
+void ast_vm_test_swap_table_in(const struct ast_vm_functions *vm_table)
+{
+	RAII_VAR(struct ast_vm_functions *, holding_table, NULL, ao2_cleanup);
+	RAII_VAR(struct ast_vm_functions *, new_table, NULL, ao2_cleanup);
+
+	if (provider_is_swapped) {
+		ast_log(LOG_ERROR, "Attempted to swap in test function table without swapping out old test table.\n");
+		return;
+	}
+
+	holding_table = ao2_global_obj_ref(vm_provider);
+
+	if (holding_table) {
+		ao2_global_obj_replace_unref(vm_provider_holder, holding_table);
+	}
+
+	new_table = ao2_alloc_options(sizeof(*new_table), NULL, AO2_ALLOC_OPT_LOCK_NOLOCK);
+	if (!new_table) {
+		return;
+	}
+	*new_table = *vm_table;
+
+	ao2_global_obj_replace_unref(vm_provider, new_table);
+	provider_is_swapped = 1;
+}
+
+void ast_vm_test_swap_table_out(void)
+{
+	RAII_VAR(struct ast_vm_functions *, held_table, NULL, ao2_cleanup);
+
+	if (!provider_is_swapped) {
+		ast_log(LOG_ERROR, "Attempted to swap out test function table, but none is currently installed.\n");
+		return;
+	}
+
+	held_table = ao2_global_obj_ref(vm_provider_holder);
+	if (!held_table) {
+		return;
+	}
+
+	ao2_global_obj_replace_unref(vm_provider, held_table);
+	ao2_global_obj_release(vm_provider_holder);
+	provider_is_swapped = 0;
+}
+#endif
+
 /*! \brief The container for the voicemail greeter provider */
 static AO2_GLOBAL_OBJ_STATIC(vm_greeter_provider);