From 0d6d1dc02f6ade56a60337b77d279468d24ba69b Mon Sep 17 00:00:00 2001
From: FRIGN <dev@frign.de>
Date: Tue, 29 Sep 2015 23:14:59 +0200
Subject: [PATCH] Check explicit length in od(1)

If you pass an empty string, the null-char will always match
with strchr()!
---
 od.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/od.c b/od.c
index b24a279..407f550 100644
--- a/od.c
+++ b/od.c
@@ -108,13 +108,13 @@ main(int argc, char *argv[])
 	ARGBEGIN {
 	case 'A':
 		s = EARGF(usage());
-		if (strlen(s) > 1 || !strchr("doxn", s[0]))
+		if (strlen(s) != 1 || !strchr("doxn", s[0]))
 			usage();
 		radix = s[0];
 		break;
 	case 't':
 		s = EARGF(usage());
-		if (strlen(s) > 1 || !strchr("acdoux", s[0]))
+		if (strlen(s) != 1 || !strchr("acdoux", s[0]))
 			usage();
 		type = s[0];
 		break;