pw_copy
else if (pw_copy(pfd, tfd, pwd, old_pwd) == -1)
int pw_copy(int _ffd, int _tfd, const struct passwd *_pw,
if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) {
if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) {