From 9c0891d48e02da725c4be111b279d85f081ed9a3 Mon Sep 17 00:00:00 2001
From: robin <>
Date: Wed, 11 Dec 1996 17:05:25 +0000
Subject: [PATCH] Fix SLC_NAME_OK() macro which would return non-zero, if given
 the argument: 0 (which is not a valid SLC code -- valid SLC codes are
 currently 1 -> 30 inclusive, from RFC-1184).

---
 src/include/arpa/telnet.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/include/arpa/telnet.h b/src/include/arpa/telnet.h
index 5ab526a4..f396e105 100644
--- a/src/include/arpa/telnet.h
+++ b/src/include/arpa/telnet.h
@@ -235,7 +235,7 @@ extern char *slc_names[];
 #define	SLC_NAMES SLC_NAMELIST
 #endif
 
-#define	SLC_NAME_OK(x)	((unsigned int)(x) <= NSLC)
+#define	SLC_NAME_OK(x)	((unsigned)(x) > 0 && (unsigned)(x) <= NSLC)
 #define SLC_NAME(x)	slc_names[x]
 
 #define	SLC_NOSUPPORT	0