From 71f2362aa4ebec211ecf3f4b69f1a173dad81107 Mon Sep 17 00:00:00 2001
From: David Xu <davidxu@FreeBSD.org>
Date: Tue, 24 Dec 2002 07:40:10 +0000
Subject: [PATCH] Check NULL pointer to avoid SIGSEGV

---
 usr.bin/gencat/genlib.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/usr.bin/gencat/genlib.c b/usr.bin/gencat/genlib.c
index 8eaf39c64400..d0fcefa0d38b 100644
--- a/usr.bin/gencat/genlib.c
+++ b/usr.bin/gencat/genlib.c
@@ -450,7 +450,8 @@ MCReadCat(int fd)
 static void
 printS(int fd, const char *str)
 {
-    write(fd, str, strlen(str));
+    if (str)
+	write(fd, str, strlen(str));
 }
 
 static void