Display the list of all valid string keywords when --string, is used

without an argument or with an invalid one.

1 files changed, 7 insertions, 0 deletions

diff --git a/vpdopt.c b/vpdopt.c
index 4ebb892..87d7676 100644
--- a/vpdopt.c
+++ b/vpdopt.c
@@ -122,6 +122,13 @@ int parse_command_line(int argc, char * const argv[])
 				opt.flags|=FLAG_VERSION;
 				break;
 			case '?':
+				switch(optopt)
+				{
+					case 's':
+						fprintf(stderr, "String keyword expected\n");
+						print_opt_string_list();
+						break;
+				}
 				return -1;
 		}