From c13d88ba971c540c525ab9adbbd1d663cf6fc6d3 Mon Sep 17 00:00:00 2001
From: Alexandre Julliard <julliard@winehq.org>
Date: Mon, 21 Mar 2022 11:52:22 +0100
Subject: [PATCH] ntdll: Implement RtlGetLocaleFileMappingAddress().

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/ntdll/locale.c   | 23 +++++++++++++++++++++++
 dlls/ntdll/ntdll.spec |  1 +
 include/winternl.h    |  1 +
 3 files changed, 25 insertions(+)

diff --git a/dlls/ntdll/locale.c b/dlls/ntdll/locale.c
index fe185d403f2..360496dd7e1 100644
--- a/dlls/ntdll/locale.c
+++ b/dlls/ntdll/locale.c
@@ -701,6 +701,29 @@ void WINAPI RtlResetRtlTranslations( const NLSTABLEINFO *info )
 }
 
 
+/**************************************************************************
+ *      RtlGetLocaleFileMappingAddress   (NTDLL.@)
+ */
+NTSTATUS WINAPI RtlGetLocaleFileMappingAddress( void **ptr, LCID *lcid, LARGE_INTEGER *size )
+{
+    static void *cached_ptr;
+    static LCID cached_lcid;
+
+    if (!cached_ptr)
+    {
+        void *addr;
+        NTSTATUS status = NtInitializeNlsFiles( &addr, &cached_lcid, size );
+
+        if (status) return status;
+        if (InterlockedCompareExchangePointer( &cached_ptr, addr, NULL ))
+            NtUnmapViewOfSection( GetCurrentProcess(), addr );
+    }
+    *ptr = cached_ptr;
+    *lcid = cached_lcid;
+    return STATUS_SUCCESS;
+}
+
+
 /**************************************************************************
  *      RtlAnsiCharToUnicodeChar   (NTDLL.@)
  */
diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 6d134770596..4c7b9be1d9f 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -726,6 +726,7 @@
 # @ stub RtlGetLengthWithoutLastFullDosOrNtPathElement
 # Yes, Microsoft really misspelled this one!
 # @ stub RtlGetLengthWithoutTrailingPathSeperators
+@ stdcall RtlGetLocaleFileMappingAddress(ptr ptr ptr)
 @ stdcall RtlGetLongestNtPathLength()
 @ stdcall -syscall -arch=win32 RtlGetNativeSystemInformation(long ptr long ptr) NtWow64GetNativeSystemInformation
 @ stdcall -syscall -arch=win64 RtlGetNativeSystemInformation(long ptr long ptr) NtQuerySystemInformation
diff --git a/include/winternl.h b/include/winternl.h
index 68c174d6086..3fa5fad9b46 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -4346,6 +4346,7 @@ NTSYSAPI ULONG     WINAPI RtlGetFullPathName_U(PCWSTR,ULONG,PWSTR,PWSTR*);
 NTSYSAPI NTSTATUS  WINAPI RtlGetGroupSecurityDescriptor(PSECURITY_DESCRIPTOR,PSID *,PBOOLEAN);
 NTSYSAPI NTSTATUS  WINAPI RtlGetLastNtStatus(void);
 NTSYSAPI DWORD     WINAPI RtlGetLastWin32Error(void);
+NTSYSAPI NTSTATUS  WINAPI RtlGetLocaleFileMappingAddress(void**,LCID*,LARGE_INTEGER*);
 NTSYSAPI DWORD     WINAPI RtlGetLongestNtPathLength(void);
 NTSYSAPI ULONG     WINAPI RtlGetNtGlobalFlags(void);
 NTSYSAPI BOOLEAN   WINAPI RtlGetNtProductType(LPDWORD);