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Call NULL by its name 

In variadic functions we still do the cast.  In POSIX, it's not
necessary, since NULL is required to be of type 'void *', and 'void *'
is guaranteed to have the same alignment and representation as 'char *'.
However, since ISO C still doesn't mandate that, and moreover they're
doing dubious stuff by adding nullptr, let's be on the cautious side.
Also, C++ requires that NULL is _not_ 'void *', but either plain 0 or
some magic stuff.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
This commit is contained in:
Alejandro Colomar 2023-02-01 02:50:14 +01:00 committed by Serge Hallyn
parent 1482224c54
commit 62172f6fb5
31 changed files with 84 additions and 84 deletions
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4
lib/gshadow.c
View File

@ -103,7 +103,7 @@ void endsgent (void)
(void) fclose (shadow);
}
shadow = (FILE *) 0;
shadow = NULL;
}
/*@observer@*//*@null@*/struct sgrp *sgetsgent (const char *string)
@ -399,7 +399,7 @@ void endsgent (void)
nis_disabled = true;
}
#endif
while ((sgrp = getsgent ()) != (struct sgrp *) 0) {
while ((sgrp = getsgent ()) != NULL) {
if (strcmp (name, sgrp->sg_name) == 0) {
break;
}

6
lib/port.c
View File

@ -79,7 +79,7 @@ static void endportent (void)
(void) fclose (ports);
}
ports = (FILE *) 0;
ports = NULL;
}
/*
@ -172,13 +172,13 @@ static struct port *getportent (void)
}
*cp = '\0';
cp++;
port.pt_names[j + 1] = (char *) 0;
port.pt_names[j + 1] = NULL;
/*
* Get the list of user names. It is the second colon
* separated field, and is a comma separated list of user
* names. The entry '*' is used to specify all usernames.
* The last entry in the list is a (char *) 0 pointer.
* The last entry in the list is a NULL pointer.
*/
if (':' != *cp) {

20
lib/sgetgrent.c
View File

@ -34,7 +34,7 @@
*/
static char **list (char *s)
{
static char **members = 0;
static char **members = NULL;
static int size = 0; /* max members + 1 */
int i;
char **rbuf;
@ -55,9 +55,9 @@ static char **list (char *s)
}
if (!rbuf) {
free (members);
members = 0;
members = NULL;
size = 0;
return (char **) 0;
return NULL;
}
members = rbuf;
}
@ -71,14 +71,14 @@ static char **list (char *s)
*s++ = '\0';
}
}
members[i] = (char *) 0;
members[i] = NULL;
return members;
}
struct group *sgetgrent (const char *buf)
{
static char *grpbuf = 0;
static char *grpbuf = NULL;
static size_t size = 0;
static char *grpfields[NFIELDS];
static struct group grent;
@ -91,9 +91,9 @@ struct group *sgetgrent (const char *buf)
free (grpbuf);
size = strlen (buf) + 1000; /* at least: strlen(buf) + 1 */
grpbuf = malloc (size);
if (!grpbuf) {
if (grpbuf == NULL) {
size = 0;
return 0;
return NULL;
}
}
strcpy (grpbuf, buf);
@ -112,16 +112,16 @@ struct group *sgetgrent (const char *buf)
}
}
if (i < (NFIELDS - 1) || *grpfields[2] == '\0' || cp != NULL) {
return (struct group *) 0;
return NULL;
}
grent.gr_name = grpfields[0];
grent.gr_passwd = grpfields[1];
if (get_gid (grpfields[2], &grent.gr_gid) == 0) {
return (struct group *) 0;
return NULL;
}
grent.gr_mem = list (grpfields[3]);
if (NULL == grent.gr_mem) {
return (struct group *) 0; /* out of memory */
return NULL; /* out of memory */
}
return &grent;

8
lib/shadow.c
View File

@ -94,7 +94,7 @@ void endspent (void)
(void) fclose (shadow);
}
shadow = (FILE *) 0;
shadow = NULL;
}
/*
@ -336,9 +336,9 @@ struct spwd *fgetspent (FILE * fp)
}
#ifdef USE_NIS
while (fgets (buf, (int) sizeof buf, fp) != (char *) 0)
while (fgets (buf, (int) sizeof buf, fp) != NULL)
#else
if (fgets (buf, (int) sizeof buf, fp) != (char *) 0)
if (fgets (buf, (int) sizeof buf, fp) != NULL)
#endif
{
cp = strchr (buf, '\n');
@ -511,7 +511,7 @@ struct spwd *getspnam (const char *name)
nis_disabled = true;
}
#endif
while ((sp = getspent ()) != (struct spwd *) 0) {
while ((sp = getspent ()) != NULL) {
if (strcmp (name, sp->sp_namp) == 0) {
break;
}

4
libmisc/age.c
View File

@ -112,7 +112,7 @@ int expire (const struct passwd *pw, /*@null@*/const struct spwd *sp)
_exit (126);
}
(void) execl (PASSWD_PROGRAM, PASSWD_PROGRAM, pw->pw_name, (char *) 0);
(void) execl (PASSWD_PROGRAM, PASSWD_PROGRAM, pw->pw_name, (char *) NULL);
err = errno;
perror ("Can't execute " PASSWD_PROGRAM);
_exit ((ENOENT == err) ? E_CMD_NOTFOUND : E_CMD_NOEXEC);
@ -139,7 +139,7 @@ int expire (const struct passwd *pw, /*@null@*/const struct spwd *sp)
void agecheck (/*@null@*/const struct spwd *sp)
{
long now = (long) time ((time_t *) 0) / SCALE;
long now = (long) time(NULL) / SCALE;
long remain;
if (NULL == sp) {

2
libmisc/entry.c
View File

@ -24,7 +24,7 @@ void pw_entry (const char *name, struct passwd *pwent)
struct spwd *spwd;
if (!(passwd = getpwnam (name))) { /* local, no need for xgetpwnam */
pwent->pw_name = (char *) 0;
pwent->pw_name = NULL;
return;
} else {
pwent->pw_name = xstrdup (passwd->pw_name);

4
libmisc/env.c
View File

@ -41,7 +41,7 @@ static const char *const forbid[] = {
"PATH=",
"SHELL=",
"SHLIB_PATH=",
(char *) 0
NULL
};
/* these are allowed, but with no slashes inside
@ -50,7 +50,7 @@ static const char *const noslash[] = {
"LANG=",
"LANGUAGE=",
"LC_", /* anything with the LC_ prefix */
(char *) 0
NULL
};
/*

2
libmisc/isexpired.c
View File

@ -40,7 +40,7 @@ int isexpired (const struct passwd *pw, /*@null@*/const struct spwd *sp)
{
long now;
now = (long) time ((time_t *) 0) / SCALE;
now = (long) time(NULL) / SCALE;
if (NULL == sp) {
return 0;

18
libmisc/list.c
View File

@ -33,7 +33,7 @@
* pointer if it is present.
*/
for (i = 0; list[i] != (char *) 0; i++) {
for (i = 0; list[i] != NULL; i++) {
if (strcmp (list[i], member) == 0) {
return list;
}
@ -52,12 +52,12 @@
* is returned to the invoker.
*/
for (i = 0; list[i] != (char *) 0; i++) {
for (i = 0; list[i] != NULL; i++) {
tmp[i] = list[i];
}
tmp[i] = xstrdup (member);
tmp[i+1] = (char *) 0;
tmp[i+1] = NULL;
return tmp;
}
@ -83,7 +83,7 @@
* pointer if it is not present.
*/
for (i = j = 0; list[i] != (char *) 0; i++) {
for (i = j = 0; list[i] != NULL; i++) {
if (strcmp (list[i], member) != 0) {
j++;
}
@ -106,14 +106,14 @@
* is returned to the invoker.
*/
for (i = j = 0; list[i] != (char *) 0; i++) {
for (i = j = 0; list[i] != NULL; i++) {
if (strcmp (list[i], member) != 0) {
tmp[j] = list[i];
j++;
}
}
tmp[j] = (char *) 0;
tmp[j] = NULL;
return tmp;
}
@ -142,7 +142,7 @@
list++;
}
tmp[i] = (char *) 0;
tmp[i] = NULL;
return tmp;
}
@ -217,7 +217,7 @@ bool is_on_list (char *const *list, const char *member)
*/
if ('\0' == *members) {
*array = (char *) 0;
*array = NULL;
free (members);
return array;
}
@ -235,7 +235,7 @@ bool is_on_list (char *const *list, const char *member)
cp2++;
cp = cp2;
} else {
array[i + 1] = (char *) 0;
array[i + 1] = NULL;
break;
}
}

2
libmisc/loginprompt.c
View File

@ -122,7 +122,7 @@ void login_prompt (const char *prompt, char *name, int namesize)
int envc;
for (envc = 0; envc < MAX_ENV; envc++) {
nvar = strtok ((0 != envc) ? (char *) 0 : cp, " \t,");
nvar = strtok ((0 != envc) ? NULL : cp, " \t,");
if (NULL == nvar) {
break;
}

2
libmisc/pwdcheck.c
View File

@ -26,7 +26,7 @@ void passwd_check (const char *user, const char *passwd, unused const char *prog
if (NULL != sp) {
passwd = sp->sp_pwdp;
}
if (pw_auth (passwd, user, PW_LOGIN, (char *) 0) != 0) {
if (pw_auth (passwd, user, PW_LOGIN, NULL) != 0) {
SYSLOG ((LOG_WARN, "incorrect password for `%s'", user));
(void) sleep (1);
fprintf (log_get_logfd(), _("Incorrect password for %s.\n"), user);

8
libmisc/shell.c
View File

@ -33,7 +33,7 @@ int shell (const char *file, /*@null@*/const char *arg, char *const envp[])
char arg0[1024];
int err;
if (file == (char *) 0) {
if (file == NULL) {
errno = EINVAL;
return errno;
}
@ -44,7 +44,7 @@ int shell (const char *file, /*@null@*/const char *arg, char *const envp[])
* that. So, we determine the 0'th entry only if they
* don't want to tell us what it is themselves.
*/
if (arg == (char *) 0) {
if (arg == NULL) {
(void) snprintf (arg0, sizeof arg0, "-%s", Basename (file));
arg0[sizeof arg0 - 1] = '\0';
arg = arg0;
@ -55,7 +55,7 @@ int shell (const char *file, /*@null@*/const char *arg, char *const envp[])
* able to figure out what we are up to without too much
* grief.
*/
(void) execle (file, arg, (char *) 0, envp);
(void) execle (file, arg, (char *) NULL, envp);
err = errno;
if (access (file, R_OK|X_OK) == 0) {
@ -63,7 +63,7 @@ int shell (const char *file, /*@null@*/const char *arg, char *const envp[])
* Assume this is a shell script (with no shebang).
* Interpret it with /bin/sh
*/
(void) execle (SHELL, "sh", "-", file, (char *)0, envp);
(void) execle (SHELL, "sh", "-", file, (char *) NULL, envp);
err = errno;
}

2
libmisc/sulog.c
View File

@ -64,7 +64,7 @@ void sulog (const char *tty, bool success, const char *oldname, const char *name
/* Do not return if the group permission were raised. */
exit (EXIT_FAILURE);
}
if (fp == (FILE *) 0) {
if (fp == NULL) {
return; /* can't open or create logfile */
}

8
src/chfn.c
View File

@ -510,28 +510,28 @@ static void get_old_fields (const char *gecos)
* Now get the full name. It is the first comma separated field in
* the GECOS field.
*/
cp = copy_field (old_gecos, fflg ? (char *) 0 : fullnm, slop);
cp = copy_field (old_gecos, fflg ? NULL : fullnm, slop);
/*
* Now get the room number. It is the next comma separated field,
* if there is indeed one.
*/
if (NULL != cp) {
cp = copy_field (cp, rflg ? (char *) 0 : roomno, slop);
cp = copy_field (cp, rflg ? NULL : roomno, slop);
}
/*
* Now get the work phone number. It is the third field.
*/
if (NULL != cp) {
cp = copy_field (cp, wflg ? (char *) 0 : workph, slop);
cp = copy_field (cp, wflg ? NULL : workph, slop);
}
/*
* Now get the home phone number. It is the fourth field.
*/
if (NULL != cp) {
cp = copy_field (cp, hflg ? (char *) 0 : homeph, slop);
cp = copy_field (cp, hflg ? NULL : homeph, slop);
}
/*

2
src/chgpasswd.c
View File

@ -441,7 +441,7 @@ int main (int argc, char **argv)
* group entry for each group will be looked up in the appropriate
* file (gshadow or group) and the password changed.
*/
while (fgets (buf, (int) sizeof buf, stdin) != (char *) 0) {
while (fgets (buf, (int) sizeof buf, stdin) != NULL) {
line++;
cp = strrchr (buf, '\n');
if (NULL != cp) {

4
src/chpasswd.c
View File

@ -482,7 +482,7 @@ int main (int argc, char **argv)
* last change date is set in the age only if aging information is
* present.
*/
while (fgets (buf, (int) sizeof buf, stdin) != (char *) 0) {
while (fgets (buf, (int) sizeof buf, stdin) != NULL) {
line++;
cp = strrchr (buf, '\n');
if (NULL != cp) {
@ -491,7 +491,7 @@ int main (int argc, char **argv)
if (feof (stdin) == 0) {
// Drop all remaining characters on this line.
while (fgets (buf, (int) sizeof buf, stdin) != (char *) 0) {
while (fgets (buf, (int) sizeof buf, stdin) != NULL) {
cp = strchr (buf, '\n');
if (cp != NULL) {
break;

2
src/faillog.c
View File

@ -57,7 +57,7 @@ static bool rflg = false; /* reset the counters of login failures */
static struct stat statbuf; /* fstat buffer for file size */
#define NOW (time((time_t *) 0))
#define NOW time(NULL)
static /*@noreturn@*/void usage (int status)
{

2
src/gpasswd.c
View File

@ -721,7 +721,7 @@ static void check_perms (const struct group *gr)
* --marekm
*/
if (!amroot) {
if (gr->gr_mem[0] == (char *) 0) {
if (gr->gr_mem[0] == NULL) {
failure ();
}

2
src/groupdel.c
View File

@ -275,7 +275,7 @@ static void group_busy (gid_t gid)
* If pwd isn't NULL, it stopped because the gid's matched.
*/
if (pwd == (struct passwd *) 0) {
if (pwd == NULL) {
return;
}

2
src/groupmod.c
View File

@ -248,7 +248,7 @@ static void grp_update (void)
if (NULL != grp.gr_mem[0])
gr_free_members(&grp);
grp.gr_mem = (char **)xmalloc(sizeof(char *));
grp.gr_mem[0] = (char *)0;
grp.gr_mem[0] = NULL;
} else {
// append to existing groups
if (NULL != grp.gr_mem[0])

2
src/lastlog.c
View File

@ -56,7 +56,7 @@ static bool bflg = false; /* print excludes most recent days */
static bool Cflg = false; /* clear record for user */
static bool Sflg = false; /* set record for user */
#define NOW (time ((time_t *) 0))
#define NOW time(NULL)
static /*@noreturn@*/void usage (int status)
{

8
src/login.c
View File

@ -974,7 +974,7 @@ int main (int argc, char **argv)
goto auth_ok;
}
if (pw_auth (user_passwd, username, reason, (char *) 0) == 0) {
if (pw_auth (user_passwd, username, reason, NULL) == 0) {
goto auth_ok;
}
@ -1041,7 +1041,7 @@ int main (int argc, char **argv)
* all). --marekm
*/
if (user_passwd[0] == '\0') {
pw_auth ("!", username, reason, (char *) 0);
pw_auth ("!", username, reason, NULL);
}
/*
@ -1081,7 +1081,7 @@ int main (int argc, char **argv)
* by Ivan Nejgebauer <ian@unsux.ns.ac.yu>. --marekm
*/
if ( getdef_bool ("PORTTIME_CHECKS_ENAB")
&& !isttytime (username, tty, time ((time_t *) 0))) {
&& !isttytime (username, tty, time (NULL))) {
SYSLOG ((LOG_WARN, "invalid login time for '%s'%s",
username, fromhost));
closelog ();
@ -1308,7 +1308,7 @@ int main (int argc, char **argv)
err = shell (tmp, pwd->pw_shell, newenvp); /* fake shell */
} else {
/* exec the shell finally */
err = shell (pwd->pw_shell, (char *) 0, newenvp);
err = shell (pwd->pw_shell, NULL, newenvp);
}
return ((err == ENOENT) ? E_CMD_NOTFOUND : E_CMD_NOEXEC);

20
src/login_nopam.c
View File

@ -117,9 +117,9 @@ int login_access (const char *user, const char *from)
continue;
}
if ( ((perm = strtok (line, fs)) == NULL)
|| ((users = strtok ((char *) 0, fs)) == NULL)
|| ((froms = strtok ((char *) 0, fs)) == NULL)
|| (strtok ((char *) 0, fs) != NULL)) {
|| ((users = strtok (NULL, fs)) == NULL)
|| ((froms = strtok (NULL, fs)) == NULL)
|| (strtok (NULL, fs) != NULL)) {
SYSLOG ((LOG_ERR,
"%s: line %d: bad field count",
TABLE, lineno));
@ -154,7 +154,7 @@ static bool list_match (char *list, const char *item, bool (*match_fn) (const ch
* a match, look for an "EXCEPT" list and recurse to determine whether
* the match is affected by any exceptions.
*/
for (tok = strtok (list, sep); tok != NULL; tok = strtok ((char *) 0, sep)) {
for (tok = strtok (list, sep); tok != NULL; tok = strtok (NULL, sep)) {
if (strcasecmp (tok, "EXCEPT") == 0) { /* EXCEPT: give up */
break;
}
@ -166,10 +166,10 @@ static bool list_match (char *list, const char *item, bool (*match_fn) (const ch
/* Process exceptions to matches. */
if (match) {
while ( ((tok = strtok ((char *) 0, sep)) != NULL)
while ( ((tok = strtok (NULL, sep)) != NULL)
&& (strcasecmp (tok, "EXCEPT") != 0))
/* VOID */ ;
if (tok == 0 || !list_match ((char *) 0, item, match_fn)) {
if (tok == 0 || !list_match (NULL, item, match_fn)) {
return (match);
}
}
@ -193,9 +193,9 @@ static char *myhostname (void)
static bool
netgroup_match (const char *group, const char *machine, const char *user)
{
static char *mydomain = (char *)0;
static char *mydomain = NULL;
if (mydomain == (char *)0) {
if (mydomain == NULL) {
static char domain[MAXHOSTNAMELEN + 1];
getdomainname (domain, MAXHOSTNAMELEN);
@ -228,7 +228,7 @@ static bool user_match (const char *tok, const char *string)
&& from_match (at + 1, myhostname ()));
#if HAVE_INNETGR
} else if (tok[0] == '@') { /* netgroup */
return (netgroup_match (tok + 1, (char *) 0, string));
return (netgroup_match (tok + 1, NULL, string));
#endif
} else if (string_match (tok, string)) { /* ALL or exact match */
return true;
@ -303,7 +303,7 @@ static bool from_match (const char *tok, const char *string)
*/
#if HAVE_INNETGR
if (tok[0] == '@') { /* netgroup */
return (netgroup_match (tok + 1, string, (char *) 0));
return (netgroup_match (tok + 1, string, NULL));
} else
#endif
if (string_match (tok, string)) { /* ALL or exact match */

6
src/newgrp.c
View File

@ -504,7 +504,7 @@ int main (int argc, char **argv)
if ((argc > 0) && (argv[0][0] == '-')) {
usage ();
goto failure;
} else if (argv[0] != (char *) 0) {
} else if (argv[0] != NULL) {
group = argv[0];
} else {
/*
@ -740,7 +740,7 @@ int main (int argc, char **argv)
*/
if (cflag) {
closelog ();
execl (SHELL, "sh", "-c", command, (char *) 0);
execl (SHELL, "sh", "-c", command, (char *) NULL);
#ifdef WITH_AUDIT
snprintf (audit_buf, sizeof(audit_buf),
"changing new-gid=%lu", (unsigned long) gid);
@ -820,7 +820,7 @@ int main (int argc, char **argv)
* Exec the login shell and go away. We are trying to get back to
* the previous environment which should be the user's login shell.
*/
err = shell (prog, initflag ? (char *) 0 : progbase, newenvp);
err = shell (prog, initflag ? NULL : progbase, newenvp);
exit ((err == ENOENT) ? E_CMD_NOTFOUND : E_CMD_NOEXEC);
/*@notreached@*/
failure:

2
src/newusers.c
View File

@ -1088,7 +1088,7 @@ int main (int argc, char **argv)
* over 100 is allocated. The pw_gid field will be updated with that
* value.
*/
while (fgets (buf, (int) sizeof buf, stdin) != (char *) 0) {
while (fgets (buf, (int) sizeof buf, stdin) != NULL) {
line++;
cp = strrchr (buf, '\n');
if (NULL != cp) {

2
src/pwck.c
View File

@ -812,7 +812,7 @@ static void check_spw_file (int *errors, bool *changed)
* Warn if last password change in the future. --marekm
*/
if (!quiet) {
time_t t = time ((time_t *) 0);
time_t t = time (NULL);
if ( (t != 0)
&& (spw->sp_lstchg > (long) t / SCALE)) {
printf (_("user %s: last password change in the future\n"),

6
src/su.c
View File

@ -575,7 +575,7 @@ static void check_perms_nopam (const struct passwd *pw)
* The first character of an administrator defined method is an '@'
* character.
*/
if (pw_auth (password, name, PW_SU, (char *) 0) != 0) {
if (pw_auth (password, name, PW_SU, NULL) != 0) {
SYSLOG (((pw->pw_uid != 0)? LOG_NOTICE : LOG_WARN,
"Authentication failed for %s", name));
fprintf(stderr, _("%s: Authentication failure\n"), Prog);
@ -598,7 +598,7 @@ static void check_perms_nopam (const struct passwd *pw)
* there is a "SU" entry in the /etc/porttime file denying access to
* the account.
*/
if (!isttytime (name, "SU", time ((time_t *) 0))) {
if (!isttytime (name, "SU", time (NULL))) {
SYSLOG (((0 != pw->pw_uid) ? LOG_WARN : LOG_CRIT,
"SU by %s to restricted account %s",
caller_name, name));
@ -1130,7 +1130,7 @@ int main (int argc, char **argv)
int fd = open ("/dev/tty", O_RDWR);
if (fd >= 0) {
err = ioctl (fd, TIOCNOTTY, (char *) 0);
err = ioctl (fd, TIOCNOTTY, (char *) NULL);
(void) close (fd);
} else if (ENXIO == errno) {
/* There are no controlling terminal already */

6
src/sulogin.c
View File

@ -127,7 +127,7 @@ static void catch_signals (unused int sig)
while (true) { /* repeatedly get login/password pairs */
char *cp;
pw_entry (name, &pwent); /* get entry from password file */
if (pwent.pw_name == (char *) 0) {
if (pwent.pw_name == NULL) {
/*
* Fail secure
*/
@ -155,7 +155,7 @@ static void catch_signals (unused int sig)
erase_pass (cp);
(void) puts ("");
#ifdef TELINIT
execl (PATH_TELINIT, "telinit", RUNLEVEL, (char *) 0);
execl (PATH_TELINIT, "telinit", RUNLEVEL, (char *) NULL);
#endif
exit (0);
}
@ -177,7 +177,7 @@ static void catch_signals (unused int sig)
(void) puts (_("Entering System Maintenance Mode"));
/* exec the shell finally. */
err = shell (pwent.pw_shell, (char *) 0, environ);
err = shell (pwent.pw_shell, NULL, environ);
return ((err == ENOENT) ? E_CMD_NOTFOUND : E_CMD_NOEXEC);
}

4
src/useradd.c
View File

@ -894,7 +894,7 @@ static int get_groups (char *list)
close_group_files ();
unlock_group_files ();
user_groups[ngroups] = (char *) 0;
user_groups[ngroups] = NULL;
/*
* Any errors in finding group names are fatal
@ -2546,7 +2546,7 @@ int main (int argc, char **argv)
/*
* Initialize the list to be empty
*/
user_groups[0] = (char *) 0;
user_groups[0] = NULL;
is_shadow_pwd = spw_file_present ();

2
src/userdel.c
View File

@ -763,7 +763,7 @@ static void user_cancel (const char *user)
}
argv[0] = cmd;
argv[1] = user;
argv[2] = (char *)0;
argv[2] = NULL;
(void) run_command (cmd, argv, NULL, &status);
}

6
src/usermod.c
View File

@ -205,7 +205,7 @@ static int get_groups (char *list)
/*
* Initialize the list to be empty
*/
user_groups[0] = (char *) 0;
user_groups[0] = NULL;
if ('\0' == *list) {
return 0;
@ -280,7 +280,7 @@ static int get_groups (char *list)
gr_free ((struct group *)grp);
} while (NULL != list);
user_groups[ngroups] = (char *) 0;
user_groups[ngroups] = NULL;
/*
* Any errors in finding group names are fatal
@ -2154,7 +2154,7 @@ int main (int argc, char **argv)
sys_ngroups = sysconf (_SC_NGROUPS_MAX);
user_groups = (char **) malloc (sizeof (char *) * (1 + sys_ngroups));
user_groups[0] = (char *) 0;
user_groups[0] = NULL;
is_shadow_pwd = spw_file_present ();
#ifdef SHADOWGRP