Function ignite_items

src/trap.c:7160–7172

Ignite ignitable items (limited to light sources) in the given object chain, due to some external source of fire. The object chain should be somewhere exposed, like someone's open inventory or the floor. */

   chain, due to some external source of fire.  The object chain should
   be somewhere exposed, like someone's open inventory or the floor. */
void
ignite_items(struct obj *objchn)
{
    struct obj *obj, *nextobj;
    boolean bynexthere = (objchn && objchn->where == OBJ_FLOOR);

    for (obj = objchn; obj; obj = bynexthere ? obj->nexthere : nextobj) {
        nextobj = obj->nobj;
        /* ignitable items like lamps and candles will catch fire */
        if (!obj->lamplit && !obj->in_use)
            catch_lit(obj);
    }
}

void
trap_ice_effects(coordxy x, coordxy y, boolean ice_is_melting)