+/* While do function */
+
+double while_do (element_t *cond, element_t *action)
+{
+ double ret = 0;
+ element_t *temp = NULL;
+
+ VERBOSE (DEBUG, fprintf (stdout, "starting while loop\n"));
+ if (cond == NULL) {
+ return ret;
+ }
+ while (1) {
+ VERBOSE (DEBUG, fprintf (stdout, "loop...\n"));
+
+ temp = dupelement (cond);
+ if (!evaluate_element (temp, 0)) {
+ break;
+ }
+ if (action) {
+ temp = dupelement (action);
+ ret = evaluate_element (temp, 0);
+ }
+ }
+
+ VERBOSE (DEBUG, fprintf (stdout, "ending while loop\n"));
+
+ return ret;
+}
+