Function can_chant

src/mondata.c:579–587

for casting spells and reading scrolls while blind */

/* for casting spells and reading scrolls while blind */
boolean
can_chant(struct monst *mtmp)
{
    if ((mtmp == &gy.youmonst && Strangled)
        || is_silent(mtmp->data) || !has_head(mtmp->data)
        || mtmp->data->msound == MS_BUZZ || mtmp->data->msound == MS_BURBLE)
        return FALSE;
    return TRUE;
}

/* True if mon is vulnerable to strangulation */
boolean