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// Copyright 2010 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/win/i18n.h"
#include <windows.h>
#include <ostream>
#include <string_view>
#include "base/check_op.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
namespace {
using GetPreferredUILanguages_Fn = decltype(::GetSystemPreferredUILanguages)*;
constexpr std::wstring_view kNullTerminator{L"\0", 1};
bool GetPreferredUILanguageList(GetPreferredUILanguages_Fn function,
ULONG flags,
std::vector<std::wstring>* languages) {
DCHECK_EQ((flags & (MUI_LANGUAGE_ID | MUI_LANGUAGE_NAME)), 0U);
const ULONG call_flags = flags | MUI_LANGUAGE_NAME;
ULONG language_count = 0;
ULONG buffer_length = 0;
if (!function(call_flags, &language_count, nullptr, &buffer_length) ||
!buffer_length) {
DPCHECK(!buffer_length) << "Failed getting size of preferred UI languages.";
return false;
}
std::wstring buffer(buffer_length, '\0');
if (!function(call_flags, &language_count, std::data(buffer),
&buffer_length) ||
!language_count) {
DPCHECK(!language_count) << "Failed getting preferred UI languages.";
return false;
}
// The buffer has been populated with a series of strings separated by
// terminators, which ends with a single empty string (two terminators in a
// row). Chop off the last of those two terminators so that |buffer| is a
// basic_string that contains the terminator ending the last string but not
// the terminator denoting an empty string.
buffer.resize(buffer_length - 1);
// Split string on NUL characters.
ULONG languages_added = 0;
for (auto token :
base::SplitStringPiece(buffer, kNullTerminator, base::KEEP_WHITESPACE,
base::SPLIT_WANT_NONEMPTY)) {
languages->emplace_back(token);
++languages_added;
}
DCHECK_EQ(languages_added, language_count);
return true;
}
} // namespace
namespace base {
namespace win {
namespace i18n {
bool GetUserPreferredUILanguageList(std::vector<std::wstring>* languages) {
DCHECK(languages);
return GetPreferredUILanguageList(::GetUserPreferredUILanguages, 0,
languages);
}
bool GetThreadPreferredUILanguageList(std::vector<std::wstring>* languages) {
DCHECK(languages);
return GetPreferredUILanguageList(
::GetThreadPreferredUILanguages,
MUI_MERGE_SYSTEM_FALLBACK | MUI_MERGE_USER_FALLBACK, languages);
}
} // namespace i18n
} // namespace win
} // namespace base
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