Function can_twoweapon

src/wield.c:760–804

}

int
can_twoweapon(void)
{
    struct obj *otmp;

    if (!could_twoweap(gy.youmonst.data)) {
        if (Upolyd)
            You_cant("use two weapons in your current form.");
        else
            pline("%s aren't able to use two weapons at once.",
                  makeplural((flags.female && gu.urole.name.f)
                             ? gu.urole.name.f : gu.urole.name.m));
    } else if (!uwep || !uswapwep) {
        const char *hand_s = body_part(HAND);

        if (!uwep && !uswapwep)
            hand_s = makeplural(hand_s);
        /* "your hands are empty" or "your {left|right} hand is empty" */
        Your("%s%s %s empty.", uwep ? "left " : uswapwep ? "right " : "",
             hand_s, vtense(hand_s, "are"));
    } else if (!TWOWEAPOK(uwep) || !TWOWEAPOK(uswapwep)) {
        otmp = !TWOWEAPOK(uwep) ? uwep : uswapwep;
        pline("%s %s suitable %s weapon%s.", Yname2(otmp),
              is_plural(otmp) ? "aren't" : "isn't a",
              (otmp == uwep) ? "primary" : "secondary",
              plur(otmp->quan));
    } else if (bimanual(uwep) || bimanual(uswapwep)) {
        otmp = bimanual(uwep) ? uwep : uswapwep;
        pline("%s isn't one-handed.", Yname2(otmp));
    } else if (uarms) {
        You_cant("use two weapons while wearing a shield.");
    } else if (uswapwep->oartifact) {
        pline("%s being held second to another weapon!",
              Yobjnam2(uswapwep, "resist"));
    } else if (uswapwep->otyp == CORPSE && cant_wield_corpse(uswapwep)) {
        /* [Note: !TWOWEAPOK() check prevents ever getting here...] */
        ; /* must be life-saved to reach here; return FALSE */
    } else if (Glib || uswapwep->cursed) {
        if (!Glib)
            set_bknown(uswapwep, 1);
        drop_uswapwep();
    } else
        return TRUE;
    return FALSE;
}

/* uswapwep has become cursed while in two-weapon combat mode or hero is
   attempting to dual-wield when it is already cursed or hands are slippery */