From b10abbc3c0dc774658140663a50f71d22871396d Mon Sep 17 00:00:00 2001
From: obrien <obrien@FreeBSD.org>
Date: Thu, 29 Jul 1999 09:47:33 +0000
Subject: Check that user supplied the required argument; and if not, show
 usage().

Obtained from:	OpenBSD
---
 usr.bin/yacc/yyfix.sh | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'usr.bin/yacc')

diff --git a/usr.bin/yacc/yyfix.sh b/usr.bin/yacc/yyfix.sh
index 29085f9..d983df6 100644
--- a/usr.bin/yacc/yyfix.sh
+++ b/usr.bin/yacc/yyfix.sh
@@ -37,6 +37,11 @@ OLDYACC="yyexca yyact yypact yypgo yyr1 yyr2 yychk yydef"
 NEWYACC="yylhs yylen yydefred yydgoto yysindex yyrindex yygindex \
 	 yytable yycheck"
 
+if [ $# -eq 0 ]; then
+	echo "usage: $0 file [tables]" >&2
+	exit 1
+fi
+
 file=$1
 >$file
 shift
-- 
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