From e524a581b1961a489bf88710e39f4377ffda5eac Mon Sep 17 00:00:00 2001
From: Robert Nordier <rnordier@FreeBSD.org>
Date: Thu, 29 Oct 1998 14:40:20 +0000
Subject: [PATCH] Check for a zero-length as well as a NULL string argument.

---
 lib/libc/stdio/perror.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/libc/stdio/perror.c b/lib/libc/stdio/perror.c
index 91a7dee8b26..bb618247e96 100644
--- a/lib/libc/stdio/perror.c
+++ b/lib/libc/stdio/perror.c
@@ -50,7 +50,7 @@ perror(s)
 	struct iovec iov[4];
 
 	v = iov;
-	if (s != NULL) {
+	if (s != NULL && *s != '\0') {
 		v->iov_base = (char *)s;
 		v->iov_len = strlen(s);
 		v++;