From d2336bead565991dbb8f9f042602358cce248ed6 Mon Sep 17 00:00:00 2001
From: Timo Kreuzer <timo.kreuzer@reactos.org>
Date: Tue, 26 Aug 2025 17:04:14 +0300
Subject: [PATCH] [MSVCRT] Fix a bug in _wctomb_l

Fixes crash in msvcrt_apitest:wctomb
---
 dll/win32/msvcrt/wcs.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/dll/win32/msvcrt/wcs.c b/dll/win32/msvcrt/wcs.c
index af9da19d8d7..a7dbb59d11c 100644
--- a/dll/win32/msvcrt/wcs.c
+++ b/dll/win32/msvcrt/wcs.c
@@ -2147,8 +2147,17 @@ int CDECL wctomb_s(int *len, char *mbchar, size_t size, wchar_t wch)
 int CDECL _wctomb_l(char *dst, wchar_t ch, _locale_t locale)
 {
     int len;
-
+#ifdef __REACTOS__
+    int maxlen;
+    if (locale)
+        maxlen = locale->locinfo->mb_cur_max;
+    else
+        maxlen = get_locinfo()->mb_cur_max;
+    if (_wctomb_s_l(&len, dst, maxlen, ch, locale) != 0)
+        return -1;
+#else
     _wctomb_s_l(&len, dst, dst ? MB_LEN_MAX : 0, ch, locale);
+#endif
     return len;
 }