From 583efa1268dfc7b55ec568903d4fd8027ec7db0f Mon Sep 17 00:00:00 2001
From: "Tim J. Robbins" <tjr@FreeBSD.org>
Date: Fri, 25 Oct 2002 13:24:45 +0000
Subject: [PATCH] Use an internal buffer for the result when the first argument
 is NULL.

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

diff --git a/lib/libc/locale/wcrtomb.c b/lib/libc/locale/wcrtomb.c
index 116dce52c81e..a76f03159386 100644
--- a/lib/libc/locale/wcrtomb.c
+++ b/lib/libc/locale/wcrtomb.c
@@ -28,6 +28,7 @@
 __FBSDID("$FreeBSD$");
 
 #include <errno.h>
+#include <limits.h>
 #include <rune.h>
 #include <stdlib.h>
 #include <wchar.h>
@@ -36,7 +37,10 @@ size_t
 wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps __unused)
 {
 	char *e;
+	char buf[MB_LEN_MAX];
 
+	if (s == NULL)
+		s = buf;
 	sputrune(wc, s, MB_CUR_MAX, &e);
 	if (e == NULL) {
 		errno = EILSEQ;