Function doorless_door

src/hack.c:4062–4074

check for a doorway which lacks its door (NODOOR or BROKEN) */

/* check for a doorway which lacks its door (NODOOR or BROKEN) */
boolean
doorless_door(coordxy x, coordxy y)
{
    struct rm *lev_p = &levl[x][y];

    if (!IS_DOOR(lev_p->typ))
        return FALSE;
    /* all rogue level doors are doorless but disallow diagonal access, so
       we treat them as if their non-existent doors were actually present */
    if (Is_rogue_level(&u.uz))
        return FALSE;
    return !(lev_p->doormask & ~(D_NODOOR | D_BROKEN));
}

/* used by drown() to check whether hero can crawl from water to <x,y>;
   also used by findtravelpath() when destination is one step away */