if(history_last > WWW_CONF_HISTORY_SIZE) {
if(history_last >= WWW_CONF_HISTORY_SIZE) {
log_back(void){  memcpy(history[history_last], url, WWW_CONF_MAX_URLLEN);  ++history_last;  if(history_last > WWW_CONF_HISTORY_SIZE) {    history_last = 0;  }}