[weiden] 13104: fixed GetCurrentDirectoryA() to properly handle the case where the caller only queries the required buffer size.

fixed GetCurrentDirectoryA() to properly handle the case where the
caller only queries the required buffer size.
Modified: trunk/reactos/lib/kernel32/file/curdir.c
  _____  

Modified: trunk/reactos/lib/kernel32/file/curdir.c
--- trunk/reactos/lib/kernel32/file/curdir.c	2005-01-17 21:40:12 UTC
(rev 13103)
+++ trunk/reactos/lib/kernel32/file/curdir.c	2005-01-17 22:05:00 UTC
(rev 13104)
@@ -38,39 +38,51 @@

 	ANSI_STRING AnsiString;
 	UNICODE_STRING UnicodeString;
 
-	/* initialize ansi string */
-	AnsiString.Length = 0;
-	AnsiString.MaximumLength = nBufferLength;
-	AnsiString.Buffer = lpBuffer;
-
 	/* allocate buffer for unicode string */
 	UnicodeString.Length = 0;
 	UnicodeString.MaximumLength = nBufferLength * sizeof(WCHAR);
-	UnicodeString.Buffer = RtlAllocateHeap (RtlGetProcessHeap (),
-	                                        0,
-
UnicodeString.MaximumLength);
+	if (nBufferLength > 0)
+	{
+		UnicodeString.Buffer = RtlAllocateHeap
(RtlGetProcessHeap (),
+		                                        0,
+
UnicodeString.MaximumLength);
 
+		/* initialize ansi string */
+		AnsiString.Length = 0;
+		AnsiString.MaximumLength = nBufferLength;
+		AnsiString.Buffer = lpBuffer;
+	}
+	else
+	{
+		UnicodeString.Buffer = NULL;
+	}
 	/* get current directory */
 	UnicodeString.Length = RtlGetCurrentDirectory_U
(UnicodeString.MaximumLength,
 
UnicodeString.Buffer);
-	DPRINT("UnicodeString.Buffer %S\n", UnicodeString.Buffer);
+	if (nBufferLength > 0)
+	{
+		DPRINT("UnicodeString.Buffer %wZ\n", &UnicodeString);
 
-	/* convert unicode string to ansi (or oem) */
-	if (bIsFileApiAnsi)
-		RtlUnicodeStringToAnsiString (&AnsiString,
-		                              &UnicodeString,
-		                              FALSE);
+		/* convert unicode string to ansi (or oem) */
+		if (bIsFileApiAnsi)
+			RtlUnicodeStringToAnsiString (&AnsiString,
+			                              &UnicodeString,
+			                              FALSE);
+		else
+			RtlUnicodeStringToOemString (&AnsiString,
+			                             &UnicodeString,
+			                             FALSE);
+		DPRINT("AnsiString.Buffer %s\n", AnsiString.Buffer);
+
+		/* free unicode string */
+		RtlFreeHeap (RtlGetProcessHeap (),
+		             0,
+		             UnicodeString.Buffer);
+	}
 	else
-		RtlUnicodeStringToOemString (&AnsiString,
-		                             &UnicodeString,
-		                             FALSE);
-	DPRINT("AnsiString.Buffer %s\n", AnsiString.Buffer);
-
-	/* free unicode string */
-	RtlFreeHeap (RtlGetProcessHeap (),
-	             0,
-	             UnicodeString.Buffer);
-
+	{
+		AnsiString.Length = UnicodeString.Length /
sizeof(WCHAR);
+	}
 	return AnsiString.Length;
 }