Function spelleffects_check

src/spell.c:1219–1380

}

staticfn boolean
spelleffects_check(int spell, int *res, int *energy)
{
    int chance;
    boolean confused = (Confusion != 0);

    *energy = 0;

    /*
     * Reject attempting to cast while stunned or with no free hands.
     * Already done in getspell() to stop casting before choosing
     * which spell, but duplicated here for cases where spelleffects()
     * gets called directly for ^T without intrinsic teleport capability
     * or #turn for non-priest/non-knight.
     * (There's no duplication of messages; when the rejection takes
     * place in getspell(), we don't get called.)
     */
    if ((spell == UNKNOWN_SPELL) || rejectcasting()) {
        *res = ECMD_OK; /* no time elapses */
        return TRUE;
    }

    /*
     *  Note: dotele() also calculates energy use and checks nutrition
     *  and strength requirements; if any of these change, update it too.
     */
    *energy = SPELL_LEV_PW(spellev(spell)); /* 5 <= energy <= 35 */

    /*
     * Spell casting no longer affects knowledge of the spell. A
     * decrement of spell knowledge is done every turn.
     */
    if (spellknow(spell) <= 0) {
        Your("knowledge of this spell is twisted.");
        pline("It invokes nightmarish images in your mind...");
        spell_backfire(spell);
        u.uen -= rnd(*energy);
        if (u.uen < 0)
            u.uen = 0;
        disp.botl = TRUE;
        *res = ECMD_TIME;
        return TRUE;
    } else if (spellknow(spell) <= KEEN / 200) { /* 100 turns left */
        You("strain to recall the spell.");
    } else if (spellknow(spell) <= KEEN / 40) { /* 500 turns left */
        You("have difficulty remembering the spell.");
    } else if (spellknow(spell) <= KEEN / 20) { /* 1000 turns left */
        Your("knowledge of this spell is growing faint.");
    } else if (spellknow(spell) <= KEEN / 10) { /* 2000 turns left */
        Your("recall of this spell is gradually fading.");
    }

    if (u.uhunger <= 10 && spellid(spell) != SPE_DETECT_FOOD) {
        You("are too hungry to cast that spell.");
        *res = ECMD_OK;
        return TRUE;
    } else if (ACURR(A_STR) < 4 && spellid(spell) != SPE_RESTORE_ABILITY) {
        You("lack the strength to cast spells.");