SvSETMAGIC(buffer);
static MP_INLINE long mpxs_ap_get_client_block(pTHX_ request_rec *r,                                               SV *buffer, int bufsiz){    long nrd = 0;    mpxs_sv_grow(buffer, bufsiz);    nrd = ap_get_client_block(r, SvPVX(buffer), bufsiz);    if (nrd > 0) {        mpxs_sv_cur_set(buffer, nrd);        SvTAINTED_on(buffer);    }    else {        sv_setpvn(buffer, "", 0);    }    return nrd;}