Function rndtrap

src/sp_lev.c:1158–1188

* Select a random trap */

 * Select a random trap
 */
staticfn int
rndtrap(void)
{
    int rtrap;

    do {
        rtrap = rnd(TRAPNUM - 1);
        switch (rtrap) {
        case HOLE: /* no random holes on special levels */
        case VIBRATING_SQUARE:
        case MAGIC_PORTAL:
            rtrap = NO_TRAP;
            break;
        case TRAPDOOR:
            if (!Can_dig_down(&u.uz))
                rtrap = NO_TRAP;
            break;
        case LEVEL_TELEP:
        case TELEP_TRAP:
            if (svl.level.flags.noteleport)
                rtrap = NO_TRAP;
            break;
        case ROLLING_BOULDER_TRAP:
        case ROCKTRAP:
            if (In_endgame(&u.uz))
                rtrap = NO_TRAP;
            break;
        }
    } while (rtrap == NO_TRAP);
    return rtrap;
}

/*
 * Translate a given coordinate from a special level definition into an actual