Print which argument was unknown before giving usage message

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

1 files changed, 9 insertions, 1 deletions

diff --git a/xditview.c b/xditview.c
index 675706b..483a587 100644
--- a/xditview.c
+++ b/xditview.c
@@ -170,8 +170,16 @@ main(int argc, char **argv)
     toplevel = XtAppInitialize(&xtcontext, "Xditview",
                                options, XtNumber(options),
                                &argc, argv, NULL, NULL, 0);
-    if (argc > 2)
+    if (argc > 2) {
+        fputs("Unknown argument(s):", stderr);
+        for (int n = 1; n < argc; n++) {
+            if ((n < (argc -1)) || (argv[n][0] == '-')) {
+                fprintf(stderr, " %s", argv[n]);
+            }
+        }
+        fputs("\n\n", stderr);
         Syntax(argv[0]);
+    }
 
     XtAppAddActions(xtcontext, xditview_actions, XtNumber(xditview_actions));
     XtOverrideTranslations