+ if (!opt->boot_image)
+ return -1;
+
+ opt->option->is_default = option_is_default(script, opt, id);
+
+ list_add_tail(&script->options, &opt->list);
+ script->n_options++;
+ script->opt = NULL;
+
+ return 0;
+}
+
+static int function_invoke(struct grub2_script *script,
+ void *data, int argc, char **argv)
+{
+ struct grub2_statement_function *fn = data;
+ char *name;
+ int i;
+
+ /* set positional parameters */
+ for (i = 1; i < argc; i++) {
+ name = talloc_asprintf(script, "%d", i);
+ script_env_set(script, name, argv[i]);
+ }
+
+ return statements_execute(script, fn->body);
+}
+
+int statement_function_execute(struct grub2_script *script,
+ struct grub2_statement *statement)
+{
+ struct grub2_statement_function *st = to_stmt_function(statement);
+ const char *name;
+
+ if (st->name->type == GRUB2_WORD_VAR)
+ name = expand_var(script, st->name);
+ else
+ name = st->name->text;
+
+ script_register_function(script, name, function_invoke, st);
+