Function can_blow

src/mondata.c:566–576

returns True if monster can blow (whistle, etc) */

/* returns True if monster can blow (whistle, etc) */
boolean
can_blow(struct monst *mtmp)
{
    if ((is_silent(mtmp->data) || mtmp->data->msound == MS_BUZZ)
        && (breathless(mtmp->data) || verysmall(mtmp->data)
            || !has_head(mtmp->data) || mtmp->data->mlet == S_EEL))
        return FALSE;
    if ((mtmp == &gy.youmonst) && Strangled)
        return FALSE;
    return TRUE;
}

/* for casting spells and reading scrolls while blind */
boolean