Print which argument was unknown before giving usage message

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/oclock.c b/oclock.c
index 24098a9..b9273ba 100644
--- a/oclock.c
+++ b/oclock.c
@@ -110,7 +110,14 @@ main(int argc, char *argv[])
     toplevel = XtOpenApplication(&xtcontext, "Clock",
 				 options, XtNumber(options), &argc, argv, NULL,
 				 sessionShellWidgetClass, NULL, 0);
-    if (argc != 1) usage();
+    if (argc != 1) {
+	fputs("Unknown argument(s):", stderr);
+	for (int n = 1; n < argc; n++) {
+	    fprintf(stderr, " %s", argv[n]);
+	}
+	fputs("\n\n", stderr);
+	usage();
+    }
     XtAddCallback(toplevel, XtNsaveCallback, save, NULL);
     XtAddCallback(toplevel, XtNdieCallback, die, NULL);