print usage message if options are invalid.

Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org>

diff --git a/lexer/main.c b/lexer/main.c
index a187f8ebb3fd88456aa01653418f00abd66e87c8..85adea092562d8c3c248b632060eff1933158b36 100644 (file)
--- a/lexer/main.c
+++ b/lexer/main.c
@@ -91,6 +91,8 @@ int main(int argc, char **argv) {
                 /* invalid option */
                 pr_error("%s: option '-%c' is invalid: ignored\n",
                          argv[0], optopt);
+                /* print the help message for invalid options */
+                hflag = 1;
                 break;
         }
     }