83 lines
2.9 KiB
C++
83 lines
2.9 KiB
C++
/*
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* Copyright (C) 2016 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 "android-base/properties.h"
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#include <sys/system_properties.h>
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#include <string>
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#include <android-base/parseint.h>
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namespace android {
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namespace base {
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std::string GetProperty(const std::string& key, const std::string& default_value) {
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const prop_info* pi = __system_property_find(key.c_str());
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if (pi == nullptr) return default_value;
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char buf[PROP_VALUE_MAX];
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if (__system_property_read(pi, nullptr, buf) > 0) return buf;
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// If the property exists but is empty, also return the default value.
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// Since we can't remove system properties, "empty" is traditionally
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// the same as "missing" (this was true for cutils' property_get).
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return default_value;
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}
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bool GetBoolProperty(const std::string& key, bool default_value) {
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std::string value = GetProperty(key, "");
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if (value == "1" || value == "y" || value == "yes" || value == "on" || value == "true") {
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return true;
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} else if (value == "0" || value == "n" || value == "no" || value == "off" || value == "false") {
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return false;
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}
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return default_value;
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}
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template <typename T>
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T GetIntProperty(const std::string& key, T default_value, T min, T max) {
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T result;
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std::string value = GetProperty(key, "");
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if (!value.empty() && android::base::ParseInt(value, &result, min, max)) return result;
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return default_value;
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}
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template <typename T>
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T GetUintProperty(const std::string& key, T default_value, T max) {
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T result;
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std::string value = GetProperty(key, "");
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if (!value.empty() && android::base::ParseUint(value, &result, max)) return result;
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return default_value;
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}
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template int8_t GetIntProperty(const std::string&, int8_t, int8_t, int8_t);
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template int16_t GetIntProperty(const std::string&, int16_t, int16_t, int16_t);
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template int32_t GetIntProperty(const std::string&, int32_t, int32_t, int32_t);
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template int64_t GetIntProperty(const std::string&, int64_t, int64_t, int64_t);
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template uint8_t GetUintProperty(const std::string&, uint8_t, uint8_t);
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template uint16_t GetUintProperty(const std::string&, uint16_t, uint16_t);
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template uint32_t GetUintProperty(const std::string&, uint32_t, uint32_t);
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template uint64_t GetUintProperty(const std::string&, uint64_t, uint64_t);
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bool SetProperty(const std::string& key, const std::string& value) {
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return (__system_property_set(key.c_str(), value.c_str()) == 0);
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}
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} // namespace base
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} // namespace android
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