Function bound_digging

src/mkmaze.c:1440–1461

put a non-diggable/non-phaseable boundary around the initial portion * of a level map. assumes that no level will initially put things * beyond the isok() range. * * we can't bound unconditionally on the last line with something in it, * because that something might be a niche which was already reachable, * so the boundary would be breached * * we can't bound unconditionally on one beyond

 * that provides a window of abuse for wallified special levels
 */
void
bound_digging(void)
{
    coordxy x, y;
    coordxy xmin, xmax, ymin, ymax;

    if (Is_earthlevel(&u.uz))
        return; /* everything diggable here */

    get_level_extends(&xmin, &ymin, &xmax, &ymax);

    for (x = 0; x < COLNO; x++)
        for (y = 0; y < ROWNO; y++)
            if (IS_STWALL(levl[x][y].typ)) {
                /* undiggable walls at edges, ... */
                if (y <= ymin || y >= ymax || x <= xmin || x >= xmax)
                    levl[x][y].wall_info |= W_NONDIGGABLE;
                /* one tile past that, everything is also unphaseable */
                if (y < ymin || y > ymax || x < xmin || x > xmax)
                    levl[x][y].wall_info |= W_NONPASSWALL;
            }
}

void
mkportal(coordxy x, coordxy y, xint16 todnum, xint16 todlevel)