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