change_part
static int change_part(int, int, int, daddr_t, daddr_t, char *);
change_part(E_flag, partition, csysid, cstart, csize,
prompt = change_part(chg_ext, part, 0, 0, 0, 0);
change_part (&ptable, key - 'A', units);
void change_part (struct ahdi_ptable*, int, int);