From f46a8a98a79afcbb9e9910d7d71c1f8ef4e6637f Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay.sievers@vrfy.org>
Date: Fri, 22 Aug 2008 10:04:55 +0200
Subject: vol_id: make the --offset= argument optional

---
 extras/volume_id/vol_id.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'extras/volume_id')

diff --git a/extras/volume_id/vol_id.c b/extras/volume_id/vol_id.c
index 60428ab582..b3f810fc9d 100644
--- a/extras/volume_id/vol_id.c
+++ b/extras/volume_id/vol_id.c
@@ -134,7 +134,7 @@ int main(int argc, char *argv[])
 		{ "export", 0, NULL, 'x' },
 		{ "skip-raid", 0, NULL, 's' },
 		{ "probe-all", 0, NULL, 'a' },
-		{ "offset", 1, NULL, 'o' },
+		{ "offset", 2, NULL, 'o' },
 		{ "help", 0, NULL, 'h' },
 		{}
 	};
@@ -196,7 +196,8 @@ int main(int argc, char *argv[])
 			probe_all = 1;
 			break;
 		case 'o':
-			offset = strtoull(optarg, NULL, 0);
+			if (optarg[0] != '\0')
+				offset = strtoull(optarg, NULL, 0);
 			break;
 		case 'h':
 			printf("Usage: vol_id [options] <device>\n"
-- 
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