[PATCH v2 2/2] kernelbase: Handle correctly paths with forward slashes in ReplaceFileW.

[Roman Pišl]

From: Roman Pišl

PathRemoveFileSpecW keeps only the drive if the path contains
all forward slashes as shown in tests.

But then the temporary file is created in the root folder
which fails for drive Z:.
---
 dlls/kernelbase/file.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/dlls/kernelbase/file.c b/dlls/kernelbase/file.c
index f0dedfe3b14..53286f1331a 100644
--- a/dlls/kernelbase/file.c
+++ b/dlls/kernelbase/file.c
@@ -2717,8 +2717,16 @@ BOOL WINAPI DECLSPEC_HOTPATCH ReplaceFileW( const WCHAR *replaced, const WCHAR *
          * it out of the way first. */
         WCHAR temp_path[MAX_PATH], temp_file[MAX_PATH];

-        lstrcpynW( temp_path, replaced, ARRAY_SIZE( temp_path ) );
-        PathRemoveFileSpecW( temp_path );
+        WCHAR* filePart;
+        DWORD cnt = GetFullPathNameW(replaced, ARRAY_SIZE( temp_path ), temp_path, &filePart);
+        if (!cnt) return FALSE;
+        if (cnt >= ARRAY_SIZE( temp_path ) || !filePart)
+        {
+            SetLastError( ERROR_PATH_NOT_FOUND );
+            return FALSE;
+        }
+        *filePart = 0;
+
         if (!GetTempFileNameW( temp_path, L"rf", 0, temp_file ) ||
             !MoveFileExW( replaced, temp_file, MOVEFILE_REPLACE_EXISTING ))
             return FALSE;