[reactos] 04/05: [KERNEL32]: Reimplement GetDiskFreeSpaceExA() to make it w2k3 compliant

[Pierre Schweitzer]

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commit 8b6518139db31655a395a1547dd475f06f79b934
Author: Pierre Schweitzer <pierre(a)reactos.org>
AuthorDate: Wed Oct 4 23:02:22 2017 +0200

    [KERNEL32]: Reimplement GetDiskFreeSpaceExA() to make it w2k3 compliant
---
 dll/win32/kernel32/client/file/disk.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/dll/win32/kernel32/client/file/disk.c
b/dll/win32/kernel32/client/file/disk.c
index 1ba1b73549..1b7d1e3a9d 100644
--- a/dll/win32/kernel32/client/file/disk.c
+++ b/dll/win32/kernel32/client/file/disk.c
@@ -359,18 +359,23 @@ GetDiskFreeSpaceExA(IN LPCSTR lpDirectoryName OPTIONAL,
                     OUT PULARGE_INTEGER lpTotalNumberOfBytes,
                     OUT PULARGE_INTEGER lpTotalNumberOfFreeBytes)
 {
-    PWCHAR DirectoryNameW=NULL;
+    PCSTR RootPath;
+    PUNICODE_STRING RootPathU;
 
-    if (lpDirectoryName)
+    RootPath = lpDirectoryName;
+    if (RootPath == NULL)
     {
-        if (!(DirectoryNameW = FilenameA2W(lpDirectoryName, FALSE)))
-            return FALSE;
+        RootPath = "\\";
+    }
+
+    RootPathU = Basep8BitStringToStaticUnicodeString(RootPath);
+    if (RootPathU == NULL)
+    {
+        return FALSE;
     }
 
-    return GetDiskFreeSpaceExW (DirectoryNameW ,
-                                lpFreeBytesAvailableToCaller,
-                                lpTotalNumberOfBytes,
-                                lpTotalNumberOfFreeBytes);
+    return GetDiskFreeSpaceExW(RootPathU->Buffer, lpFreeBytesAvailableToCaller,
+                              lpTotalNumberOfBytes, lpTotalNumberOfFreeBytes);
 }
 
 /*

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