trigger_exists
if (trigger_exists(trig)) {
if (trigger_exists(trig)) {
if (trigger_exists(trig)) {
if (trigger_exists(&peri->pre_trig)) {
} else if (trigger_exists(&peri->pre_trig)) {
trig = trigger_exists(&data->pre_trig) ? &data->pre_trig
trig = trigger_exists(&peri->pre_trig) ? &peri->pre_trig