Function get_level

src/dungeon.c:1801–1845

* It is expected that the second argument of get_level is a depth value, * either supplied by the user (teleport control) or randomly generated. * But more than one level can be at the same depth. If the target level * is "above" the present depth location, get_level must trace "up" from * the player's location (through the ancestors dungeons) the dungeon * within which the target level is l

 * in dungeons that build up is confined within them.
 */
void
get_level(d_level *newlevel, int levnum)
{
    branch *br;
    xint16 dgn = u.uz.dnum;

    if (levnum <= 0) {
        /* can only currently happen in endgame */
        levnum = u.uz.dlevel;
    } else if (levnum > (svd.dungeons[dgn].depth_start
                         + svd.dungeons[dgn].num_dunlevs - 1)) {
        /* beyond end of dungeon, jump to last level */
        levnum = svd.dungeons[dgn].num_dunlevs;
    } else {
        /* The desired level is in this dungeon or a "higher" one. */

        /*
         * Branch up the tree until we reach a dungeon that contains the
         * levnum.
         */
        if (levnum < svd.dungeons[dgn].depth_start) {
            do {
                /*
                 * Find the parent dungeon of this dungeon.
                 *
                 * This assumes that end2 is always the "child" and it is
                 * unique.
                 */
                for (br = svb.branches; br; br = br->next)
                    if (br->end2.dnum == dgn)
                        break;
                if (!br)
                    panic("get_level: can't find parent dungeon");

                dgn = br->end1.dnum;
            } while (levnum < svd.dungeons[dgn].depth_start);
        }

        /* We're within the same dungeon; calculate the level. */
        levnum = levnum - svd.dungeons[dgn].depth_start + 1;
    }

    newlevel->dnum = dgn;
    newlevel->dlevel = levnum;
}

/* are you in the quest dungeon? */
boolean