From 0b0bce87c41f681e1bea8538060c31c6d5345558 Mon Sep 17 00:00:00 2001
From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: Wed, 29 Nov 2023 17:31:21 +0100
Subject: [PATCH] cansequence: also show help for option "-?"

This avoids the "invalid option" error message in the auto generated
man pages.

| DESCRIPTION
|       ./cansequence: invalid option -- '?'
---
 cansequence.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cansequence.c b/cansequence.c
index 63322b8b..5d09e8ad 100644
--- a/cansequence.c
+++ b/cansequence.c
@@ -273,7 +273,7 @@ int main(int argc, char **argv)
 		{ 0, 0, 0, 0 },
 	};
 
-	while ((opt = getopt_long(argc, argv, "ei:pq::rvh", long_options, NULL)) != -1) {
+	while ((opt = getopt_long(argc, argv, "ei:pq::rvh?", long_options, NULL)) != -1) {
 		switch (opt) {
 		case 'e':
 			extended = true;
@@ -312,6 +312,7 @@ int main(int argc, char **argv)
 			break;
 
 		case 'h':
+		case '?':
 			print_usage(basename(argv[0]));
 			exit(EXIT_SUCCESS);
 			break;