125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "berberis/base/config_globals.h"
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#include <cstdlib>
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#include <cstring>
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#if defined(__BIONIC__)
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#include <sys/system_properties.h>
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#endif
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#include <bitset>
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#include <string_view>
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#include "berberis/base/checks.h"
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#include "berberis/base/forever_alloc.h"
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namespace berberis {
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namespace {
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const char* g_main_executable_real_path = nullptr;
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const char* g_app_package_name = nullptr;
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const char* g_app_private_dir = nullptr;
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const char* MakeForeverCStr(std::string_view view) {
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auto str = reinterpret_cast<char*>(AllocateForever(view.size() + 1, alignof(char)));
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memcpy(str, view.data(), view.size());
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str[view.size()] = '\0';
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return str;
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}
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#if defined(__BIONIC__)
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bool TryReadBionicSystemPropertyImpl(const std::string_view prop_name, const char** value_ptr) {
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auto pi = __system_property_find(prop_name.data());
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if (!pi) {
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return false;
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}
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__system_property_read_callback(
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pi,
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[](void* cookie, const char*, const char* value, unsigned) {
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*reinterpret_cast<const char**>(cookie) = MakeForeverCStr(value);
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},
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value_ptr);
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return true;
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}
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bool TryReadBionicSystemProperty(const std::string_view prop_name, const char** value_ptr) {
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// Allow properties without ro. prefix (they override ro. properties).
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if (prop_name.size() > 3 && prop_name.substr(0, 3) == "ro." &&
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TryReadBionicSystemPropertyImpl(prop_name.substr(3), value_ptr)) {
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return true;
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}
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return TryReadBionicSystemPropertyImpl(prop_name, value_ptr);
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}
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#endif
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bool TryReadConfig(const char* env_name,
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[[maybe_unused]] const std::string_view prop_name,
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const char** value_ptr) {
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if (auto env = getenv(env_name)) {
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*value_ptr = MakeForeverCStr(env);
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return true;
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}
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#if defined(__BIONIC__)
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return TryReadBionicSystemProperty(prop_name, value_ptr);
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#else
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return false;
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#endif
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}
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} // namespace
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ConfigStr::ConfigStr(const char* env_name, const char* prop_name) {
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TryReadConfig(env_name, prop_name, &value_);
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}
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void SetMainExecutableRealPath(std::string_view path) {
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CHECK(!path.empty());
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CHECK_EQ('/', path[0]);
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g_main_executable_real_path = MakeForeverCStr(path);
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}
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const char* GetMainExecutableRealPath() {
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return g_main_executable_real_path;
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}
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void SetAppPackageName(std::string_view name) {
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CHECK(!name.empty());
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g_app_package_name = MakeForeverCStr(name);
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}
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const char* GetAppPackageName() {
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return g_app_package_name;
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}
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void SetAppPrivateDir(std::string_view name) {
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CHECK(!name.empty());
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g_app_private_dir = MakeForeverCStr(name);
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}
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const char* GetAppPrivateDir() {
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return g_app_private_dir;
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}
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} // namespace berberis
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