Piotr Caban : ucrtbase: Support UTF8 codepage in _wcstombs_l.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 6180c2fc83bf85254607d977ea085f2fb9c85f02
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=6180c2fc83bf85254607d977ea085f2fb9c85f02

Author: Piotr Caban <piotr at codeweavers.com>
Date:   Mon Oct 19 19:35:31 2020 +0200

ucrtbase: Support UTF8 codepage in _wcstombs_l.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50025
Signed-off-by: Piotr Caban <piotr at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/msvcrt/wcs.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index 797c18e00a6..179a5b6a340 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -545,7 +545,8 @@ static MSVCRT_size_t MSVCRT_wcsrtombs_l(char *mbstr, const MSVCRT_wchar_t **wcst
 {
     MSVCRT_pthreadlocinfo locinfo;
     MSVCRT_size_t tmp = 0;
-    BOOL used_default;
+    BOOL used_default = FALSE;
+    BOOL *pused_default;
 
     if(!locale)
         locinfo = get_locinfo();
@@ -570,9 +571,11 @@ static MSVCRT_size_t MSVCRT_wcsrtombs_l(char *mbstr, const MSVCRT_wchar_t **wcst
         return i;
     }
 
+    pused_default = (locinfo->lc_codepage != CP_UTF8 ? &used_default : NULL);
+
     if(!mbstr) {
         tmp = WideCharToMultiByte(locinfo->lc_codepage, WC_NO_BEST_FIT_CHARS,
-                *wcstr, -1, NULL, 0, NULL, &used_default);
+                *wcstr, -1, NULL, 0, NULL, pused_default);
         if(!tmp || used_default) {
             *MSVCRT__errno() = MSVCRT_EILSEQ;
             return -1;
@@ -585,7 +588,7 @@ static MSVCRT_size_t MSVCRT_wcsrtombs_l(char *mbstr, const MSVCRT_wchar_t **wcst
         MSVCRT_size_t i, size;
 
         size = WideCharToMultiByte(locinfo->lc_codepage, WC_NO_BEST_FIT_CHARS,
-                *wcstr, 1, buf, 3, NULL, &used_default);
+                *wcstr, 1, buf, 3, NULL, pused_default);
         if(!size || used_default) {
             *MSVCRT__errno() = MSVCRT_EILSEQ;
             return -1;