lib/, src/: get_uid(): Use the usual -1 as an error code

Signed-off-by: Alejandro Colomar <alx@kernel.org>

lib/get_uid.c

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
+
 #include <config.h>
 
 #ident "$Id$"
@@ -11,7 +12,9 @@
 #include "prototypes.h"
 #include "defines.h"
 
-int get_uid (const char *uidstr, uid_t *uid)
+
+int
+get_uid(const char *uidstr, uid_t *uid)
 {
 	long long  val;
 	char *endptr;
@@ -22,10 +25,10 @@ int get_uid (const char *uidstr, uid_t *uid)
 	    || ('\0' != *endptr)
 	    || (0 != errno)
 	    || (/*@+longintegral@*/val != (uid_t)val)/*@=longintegral@*/) {
-		return 0;
+		return -1;
 	}
 
 	*uid = val;
-	return 1;
+	return 0;
 }
 

lib/sgetpwent.c

@@ -94,7 +94,7 @@ struct passwd *sgetpwent (const char *buf)
 
 	pwent.pw_name = fields[0];
 	pwent.pw_passwd = fields[1];
-	if (get_uid (fields[2], &pwent.pw_uid) == 0) {
+	if (get_uid(fields[2], &pwent.pw_uid) == -1) {
 		return NULL;
 	}
 	if (get_gid(fields[3], &pwent.pw_gid) == -1) {

src/newusers.c

@@ -343,7 +343,7 @@ static int get_user_id (const char *uid, uid_t *nuid) {
 	 * caller provided, or the next available UID.
 	 */
 	if (isdigit (uid[0])) {
-		if ((get_uid (uid, nuid) == 0) || (*nuid == (uid_t)-1)) {
+		if ((get_uid(uid, nuid) == -1) || (*nuid == (uid_t)-1)) {
 			fprintf (stderr,
 			         _("%s: invalid user ID '%s'\n"),
 			         Prog, uid);

src/useradd.c

@@ -1447,7 +1447,7 @@ static void process_flags (int argc, char **argv)
 				sflg = true;
 				break;
 			case 'u':
-				if (   (get_uid (optarg, &user_id) == 0)
+				if (   (get_uid(optarg, &user_id) == -1)
 				    || (user_id == (gid_t)-1)) {
 					fprintf (stderr,
 					         _("%s: invalid user ID '%s'\n"),

src/usermod.c

@@ -1151,7 +1151,7 @@ static void process_flags (int argc, char **argv)
 				sflg = true;
 				break;
 			case 'u':
-				if (   (get_uid (optarg, &user_newid) ==0)
+				if (   (get_uid(optarg, &user_newid) == -1)
 				    || (user_newid == (uid_t)-1)) {
 					fprintf (stderr,
 					         _("%s: invalid user ID '%s'\n"),