LCIDToLocaleName.c

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/*
 * PROJECT:     ReactOS Win32 Base API
 * LICENSE:     MIT (https://spdx.org/licenses/MIT)
 * PURPOSE:     Implementation of LCIDToLocaleName
 * COPYRIGHT:   Copyright 2025 Timo Kreuzer <timo.kreuzer@reactos.org>
 */
 
#include "k32_vista.h"
#include <ndk/rtlfuncs.h>
 
int
WINAPI
LCIDToLocaleName(
    _In_ LCID Locale,
    _Out_writes_opt_(cchName) LPWSTR lpName,
    _In_ int cchName,
    _In_ DWORD dwFlags)
{
    WCHAR Buffer[LOCALE_NAME_MAX_LENGTH];
    UNICODE_STRING LocaleNameString;
    DWORD RtlFlags = 0;
    NTSTATUS Status;
 
    if (cchName < 0)
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return 0;
    }
 
    if (dwFlags & LOCALE_ALLOW_NEUTRAL_NAMES)
    {
        RtlFlags |= RTL_LOCALE_ALLOW_NEUTRAL_NAMES;
    }
 
    if (lpName != NULL)
    {
        cchName = min(cchName, LOCALE_NAME_MAX_LENGTH);
        LocaleNameString.Buffer = lpName;
        LocaleNameString.Length = 0;
        LocaleNameString.MaximumLength = (USHORT)(cchName * sizeof(WCHAR));
    }
    else
    {
        LocaleNameString.Buffer = Buffer;
        LocaleNameString.Length = 0;
        LocaleNameString.MaximumLength = sizeof(Buffer);
    }
 
    /* Call the RTL function */
    Status = RtlLcidToLocaleName(Locale, &LocaleNameString, RtlFlags, FALSE);
    if (!NT_SUCCESS(Status))
    {
        SetLastError(RtlNtStatusToDosError(Status));
        return 0;
    }
 
    /* Return the length including the terminating null */
    return (LocaleNameString.Length / sizeof(WCHAR)) + 1;
}