msvcrt: Don't write Unicode BOM if file is not empty in _wsopen_dispatch.

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

msvcrt: Don't write Unicode BOM if file is not empty in _wsopen_dispatch.
00a02472 · Piotr Caban · Alexandre Julliard · b485d582 · 00a02472
Commit 00a02472 authored Nov 26, 2020 by Piotr Caban Committed by Alexandre Julliard Nov 26, 2020
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file.c dlls/msvcrt/file.c +6 -1

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--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -2297,9 +2297,14 @@ int CDECL MSVCRT__wsopen_dispatch( const MSVCRT_wchar_t* path, int oflags, int s

  if (oflags & (MSVCRT__O_WTEXT|MSVCRT__O_U16TEXT|MSVCRT__O_U8TEXT))
  {
+      LARGE_INTEGER size = {{0}};
+
+      if ((access & GENERIC_WRITE) && (creation==OPEN_EXISTING || creation==OPEN_ALWAYS))
+          GetFileSizeEx(hand, &size);
+
      if ((access & GENERIC_WRITE) && (creation==CREATE_NEW
                  || creation==CREATE_ALWAYS || creation==TRUNCATE_EXISTING
-                  || (creation==OPEN_ALWAYS && GetLastError()==ERROR_ALREADY_EXISTS)))
+                  || ((creation==OPEN_EXISTING || creation==OPEN_ALWAYS) && !size.QuadPart)))
      {
          if (oflags & MSVCRT__O_U8TEXT)
          {