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Reorder logic to improve comprehensibility

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-  Don't else after return or fail_exit().
-  Prefer == over != (negated logic is more complex to think about it).
-  Reduce nesting when reasonable.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
This commit is contained in:
Alejandro Colomar 2023-02-05 01:29:06 +01:00 committed by Serge Hallyn
parent 5b117d5526
commit e3b7058110
1 changed files with 36 additions and 44 deletions
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80
src/newusers.c
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@ -352,22 +352,20 @@ static int get_user_id (const char *uid, uid_t *nuid) {
const struct passwd *pwd;
/* local, no need for xgetpwnam */
pwd = getpwnam (uid);
if (NULL == pwd) {
if (pwd == NULL)
pwd = pw_locate (uid);
}
if (NULL != pwd) {
*nuid = pwd->pw_uid;
} else {
if (pwd == NULL) {
fprintf (stderr,
_("%s: user '%s' does not exist\n"),
Prog, uid);
return -1;
}
*nuid = pwd->pw_uid;
} else {
if (find_new_uid (rflg, nuid, NULL) < 0) {
if (find_new_uid (rflg, nuid, NULL) < 0)
return -1;
}
}
}
@ -1092,15 +1090,13 @@ int main (int argc, char **argv)
while (fgets (buf, sizeof buf, stdin) != NULL) {
line++;
cp = strrchr (buf, '\n');
if (NULL != cp) {
if (cp == NULL && feof (stdin) == 0) {
fprintf (stderr, _("%s: line %d: line too long\n"),
Prog, line);
fail_exit (EXIT_FAILURE);
}
if (cp != NULL) {
*cp = '\0';
} else {
if (feof (stdin) == 0) {
fprintf (stderr,
_("%s: line %d: line too long\n"),
Prog, line);
fail_exit (EXIT_FAILURE);
}
}
/*
@ -1111,12 +1107,11 @@ int main (int argc, char **argv)
for (cp = buf, nfields = 0; nfields < 7; nfields++) {
fields[nfields] = cp;
cp = strchr (cp, ':');
if (NULL != cp) {
*cp = '\0';
cp++;
} else {
if (cp == NULL)
break;
}
*cp = '\0';
cp++;
}
if (nfields != 6) {
fprintf (stderr, _("%s: line %d: invalid line\n"),
@ -1129,16 +1124,14 @@ int main (int argc, char **argv)
*/
pw = pw_locate (fields[0]);
/* local, no need for xgetpwnam */
if ( (NULL == pw)
&& (getpwnam (fields[0]) != NULL)) {
if (NULL == pw && getpwnam(fields[0]) != NULL) {
fprintf (stderr,
_("%s: cannot update the entry of user %s (not in the passwd database)\n"),
Prog, fields[0]);
fail_exit (EXIT_FAILURE);
}
if ( (NULL == pw)
&& (get_user_id (fields[2], &uid) != 0)) {
if (NULL == pw && get_user_id(fields[2], &uid) != 0) {
fprintf (stderr,
_("%s: line %d: can't create user\n"),
Prog, line);
@ -1237,7 +1230,7 @@ int main (int argc, char **argv)
_("%s: line %d: homedir must be an absolute path\n"),
Prog, line);
fail_exit (EXIT_FAILURE);
};
}
if (mkdir (newpw.pw_dir, mode) != 0) {
fprintf (stderr,
_("%s: line %d: mkdir %s failed: %s\n"),
@ -1247,9 +1240,8 @@ int main (int argc, char **argv)
fail_exit (EXIT_FAILURE);
}
}
if (chown (newpw.pw_dir,
newpw.pw_uid,
newpw.pw_gid) != 0) {
if (chown(newpw.pw_dir, newpw.pw_uid, newpw.pw_gid) != 0)
{
fprintf (stderr,
_("%s: line %d: chown %s failed: %s\n"),
Prog, line, newpw.pw_dir,
@ -1275,19 +1267,20 @@ int main (int argc, char **argv)
if (is_sub_uid && want_subuids() && !local_sub_uid_assigned(fields[0])) {
uid_t sub_uid_start = 0;
unsigned long sub_uid_count = 0;
if (find_new_sub_uids(&sub_uid_start, &sub_uid_count) == 0) {
if (sub_uid_add(fields[0], sub_uid_start, sub_uid_count) == 0) {
fprintf (stderr,
_("%s: failed to prepare new %s entry\n"),
Prog, sub_uid_dbname ());
fail_exit (EXIT_FAILURE);
}
} else {
if (find_new_sub_uids(&sub_uid_start, &sub_uid_count) != 0)
{
fprintf (stderr,
_("%s: can't find subordinate user range\n"),
Prog);
fail_exit (EXIT_FAILURE);
}
if (sub_uid_add(fields[0], sub_uid_start, sub_uid_count) == 0)
{
fprintf (stderr,
_("%s: failed to prepare new %s entry\n"),
Prog, sub_uid_dbname ());
fail_exit (EXIT_FAILURE);
}
}
/*
@ -1296,19 +1289,18 @@ int main (int argc, char **argv)
if (is_sub_gid && want_subgids() && !local_sub_gid_assigned(fields[0])) {
gid_t sub_gid_start = 0;
unsigned long sub_gid_count = 0;
if (find_new_sub_gids(&sub_gid_start, &sub_gid_count) == 0) {
if (sub_gid_add(fields[0], sub_gid_start, sub_gid_count) == 0) {
fprintf (stderr,
_("%s: failed to prepare new %s entry\n"),
Prog, sub_uid_dbname ());
fail_exit (EXIT_FAILURE);
}
} else {
if (find_new_sub_gids(&sub_gid_start, &sub_gid_count) != 0) {
fprintf (stderr,
_("%s: can't find subordinate group range\n"),
Prog);
fail_exit (EXIT_FAILURE);
}
if (sub_gid_add(fields[0], sub_gid_start, sub_gid_count) == 0) {
fprintf (stderr,
_("%s: failed to prepare new %s entry\n"),
Prog, sub_uid_dbname ());
fail_exit (EXIT_FAILURE);
}
}
#endif /* ENABLE_SUBIDS */
}