db_store
db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYNAME, username, olduid);
db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYUID, username, olduid);
db_store(fp, oldfp, edp, dp, &pwd, _PW_KEYBYNUM, username, olduid);
void db_store(FILE *, FILE *, DB *, DB *,struct passwd *, int, char *, uid_t);