fcc_lseek
fcc_lseek(data, (off_t) sizeof(krb5_ui_2), SEEK_SET);
if(fcc_lseek(data, (off_t) fcc_flen, SEEK_CUR) < 0)
fcc_lseek(data, (off_t) 0, SEEK_SET);
fcursor->pos = fcc_lseek(data, (off_t) 0, SEEK_CUR);
kret = (fcc_lseek(d, fcursor->pos, SEEK_SET) == (off_t) -1);
fcursor->pos = fcc_lseek(d, (off_t) 0, SEEK_CUR);
ret = fcc_lseek((krb5_fcc_data *) id->data, (off_t) 0, SEEK_END);