From e3e8878435ea88f45bce56e6d49e962bbdcf6547 Mon Sep 17 00:00:00 2001
From: "Tim J. Robbins" <tjr@FreeBSD.org>
Date: Thu, 10 Apr 2003 09:20:38 +0000
Subject: [PATCH] When called with s == NULL, behave as if wc == L'\0' as
 required by the standard.

---
 lib/libc/locale/wcrtomb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/libc/locale/wcrtomb.c b/lib/libc/locale/wcrtomb.c
index a76f0315938..7bebd1ad97b 100644
--- a/lib/libc/locale/wcrtomb.c
+++ b/lib/libc/locale/wcrtomb.c
@@ -39,8 +39,10 @@ wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps __unused)
 	char *e;
 	char buf[MB_LEN_MAX];
 
-	if (s == NULL)
+	if (s == NULL) {
 		s = buf;
+		wc = L'\0';
+	}
 	sputrune(wc, s, MB_CUR_MAX, &e);
 	if (e == NULL) {
 		errno = EILSEQ;