*: unify concurrent-safe update of /etc/{passwd,group,[g]shadow}

 by Tito (farmatito AT tiscali.it)

function                                             old     new   delta
update_passwd                                        743    1171    +428
bb_perror_nomsg                                        -       9      +9
find_main                                            436     444      +8
passwd_main                                         1023    1027      +4
nameval                                              202     206      +4
chpasswd_main                                        315     319      +4
bb__parsespent                                       119     117      -2
adduser_main                                         654     650      -4
addgroup_main                                        345     341      -4
sv_main                                             1228    1222      -6
deluser_main                                         173     160     -13
bb_internal_putpwent                                  69       -     -69
add_user_to_group                                    231       -    -231
del_line_matching                                    460      31    -429
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 5/6 up/down: 457/-758)         Total: -301 bytes

1 files changed, 2 insertions, 3 deletions

diff --git a/loginutils/chpasswd.c b/loginutils/chpasswd.c
index c83d1dad7..4bffbe83f 100644
--- a/loginutils/chpasswd.c
+++ b/loginutils/chpasswd.c
@@ -5,7 +5,6 @@
  * Written for SLIND (from passwd.c) by Alexander Shishkin <virtuoso@slind.org>
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
-
 #include "libbb.h"
 
 #if ENABLE_GETOPT_LONG
@@ -53,10 +52,10 @@ int chpasswd_main(int argc UNUSED_PARAM, char **argv)
                 /* This is rather complex: if user is not found in /etc/shadow,
                  * we try to find & change his passwd in /etc/passwd */
 #if ENABLE_FEATURE_SHADOWPASSWDS
-                rc = update_passwd(bb_path_shadow_file, name, pass);
+                rc = update_passwd(bb_path_shadow_file, name, pass, NULL);
                 if (rc == 0) /* no lines updated, no errors detected */
 #endif
-                        rc = update_passwd(bb_path_passwd_file, name, pass);
+                        rc = update_passwd(bb_path_passwd_file, name, pass, NULL);
                 /* LOGMODE_BOTH logs to syslog also */
                 logmode = LOGMODE_BOTH;
                 if (rc < 0)