List which options were unrecognized before printing usage message

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

1 files changed, 5 insertions, 0 deletions

diff --git a/xbiff.c b/xbiff.c
index ea96fb2..035c36b 100644
--- a/xbiff.c
+++ b/xbiff.c
@@ -120,6 +120,11 @@ main (int argc, char **argv)
     toplevel = XtAppInitialize(&xtcontext, "XBiff", options, XtNumber (options),
 			       &argc, argv, NULL, NULL, 0);
     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(1);
     }