Function passive

src/uhitm.c:5864–6120

Special (passive) attacks on you by monsters done here. */

/*      Special (passive) attacks on you by monsters done here.
 */
int
passive(
    struct monst *mon,
    struct obj *weapon, /* uwep or uswapwep or uarmg or uarmf or Null */
    boolean mhitb,
    boolean maliveb,
    uchar aatyp,
    boolean wep_was_destroyed)
{
    struct permonst *ptr = mon->data;
    int i, tmp;
    int mhit = mhitb ? M_ATTK_HIT : M_ATTK_MISS;
    int malive = maliveb ? M_ATTK_HIT : M_ATTK_MISS;

    for (i = 0;; i++) {
        if (i >= NATTK)
            return (malive | mhit); /* no passive attacks */
        if (ptr->mattk[i].aatyp == AT_NONE)
            break; /* try this one */
    }
    /* Note: tmp not always used */
    if (ptr->mattk[i].damn)
        tmp = d((int) ptr->mattk[i].damn, (int) ptr->mattk[i].damd);
    else if (ptr->mattk[i].damd)
        tmp = d((int) mon->m_lev + 1, (int) ptr->mattk[i].damd);
    else
        tmp = 0;

    /*  These affect you even if they just died.
     */
    switch (ptr->mattk[i].adtyp) {
    case AD_FIRE:
        if (mhitb && !mon->mcan && weapon) {
            if (aatyp == AT_KICK) {
                if (uarmf && !rn2(6))
                    (void) erode_obj(uarmf, xname(uarmf), ERODE_BURN,
                                     EF_GREASE | EF_VERBOSE);
            } else if (aatyp == AT_WEAP || aatyp == AT_CLAW
                       || aatyp == AT_MAGC || aatyp == AT_TUCH)
                passive_obj(mon, weapon, &(ptr->mattk[i]));
        }
        break;
    case AD_ACID:
        if (mhitb && rn2(2)) {
            if (Blind || !flags.verbose)
                You("are splashed!");
            else
                You("are splashed by %s %s!", s_suffix(mon_nam(mon)),
                    hliquid("acid"));

            if (!Acid_resistance) {
                mdamageu(mon, tmp);
                monstunseesu(M_SEEN_ACID);
            } else {
                monstseesu(M_SEEN_ACID);
            }
            if (!rn2(30))
                erode_armor(&gy.youmonst, ERODE_CORRODE);