[src/trunk]: src/games/gomoku gomoku: add usage

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/02b6038d65b2
branches:  trunk
changeset: 366168:02b6038d65b2
user:      rillig <rillig%NetBSD.org@localhost>
date:      Mon May 16 21:53:41 2022 +0000

description:
gomoku: add usage

diffstat:

 games/gomoku/main.c |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (29 lines):

diff -r c23908f2c522 -r 02b6038d65b2 games/gomoku/main.c
--- a/games/gomoku/main.c       Mon May 16 21:48:45 2022 +0000
+++ b/games/gomoku/main.c       Mon May 16 21:53:41 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: main.c,v 1.37 2022/05/16 21:48:45 rillig Exp $ */
+/*     $NetBSD: main.c,v 1.38 2022/05/16 21:53:41 rillig Exp $ */
 
 /*
  * Copyright (c) 1994
@@ -42,7 +42,7 @@
 #if 0
 static char sccsid[] = "@(#)main.c     8.4 (Berkeley) 5/4/95";
 #else
-__RCSID("$NetBSD: main.c,v 1.37 2022/05/16 21:48:45 rillig Exp $");
+__RCSID("$NetBSD: main.c,v 1.38 2022/05/16 21:53:41 rillig Exp $");
 #endif
 #endif /* not lint */
 
@@ -133,6 +133,10 @@
                case 'c':       /* testing: computer versus computer */
                        test = 2;
                        break;
+               default:
+                       fprintf(stderr, "usage: %s [-bcdu] [-Dfile] [file]\n",
+                           getprogname());
+                       return EXIT_FAILURE;
                }
        }
        argc -= optind;