Piotr Caban : msvcrt: Don't use tolowerW in _towlower_l.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 7d2fafc0f889fe27959785defb936d26dddf4d32
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=7d2fafc0f889fe27959785defb936d26dddf4d32

Author: Piotr Caban <piotr at codeweavers.com>
Date:   Thu Jul 16 14:46:42 2020 +0200

msvcrt: Don't use tolowerW in _towlower_l.

Signed-off-by: Piotr Caban <piotr at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/msvcrt/wcs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index 29cad7c44e..f715832c26 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -92,6 +92,7 @@ MSVCRT_wchar_t* CDECL MSVCRT__wcsdup( const MSVCRT_wchar_t* str )
 int CDECL MSVCRT__towlower_l(MSVCRT_wint_t c, MSVCRT__locale_t locale)
 {
     MSVCRT_pthreadlocinfo locinfo;
+    MSVCRT_wchar_t ret;
 
     if(!locale)
         locinfo = get_locinfo();
@@ -104,7 +105,9 @@ int CDECL MSVCRT__towlower_l(MSVCRT_wint_t c, MSVCRT__locale_t locale)
         return c;
     }
 
-    return tolowerW(c);
+    if(!LCMapStringW(locinfo->lc_handle[MSVCRT_LC_CTYPE], LCMAP_LOWERCASE, &c, 1, &ret, 1))
+        return c;
+    return ret;
 }
 
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