1 /* 2 * Copyright (C) 2022 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #ifdef ANDROID 20 21 #include <cutils/properties.h> 22 23 #else 24 25 #include <cstdio> 26 #include <cstdlib> 27 #include <cstring> 28 29 // NOLINTNEXTLINE(readability-identifier-naming) 30 constexpr int PROPERTY_VALUE_MAX = 92; 31 32 // NOLINTNEXTLINE(readability-identifier-naming) 33 auto inline property_get(const char *name, char *value, 34 const char *default_value) -> int { 35 // NOLINTNEXTLINE (concurrency-mt-unsafe) 36 char *prop = std::getenv(name); 37 snprintf(value, PROPERTY_VALUE_MAX, "%s", 38 (prop == nullptr) ? default_value : prop); 39 return static_cast<int>(strlen(value)); 40 } 41 42 /** 43 * Bluntly copied from system/core/libcutils/properties.cpp, 44 * which is part of the Android Project and licensed under Apache 2. 45 * Source: 46 * https://cs.android.com/android/platform/superproject/main/+/main:system/core/libcutils/properties.cpp;l=27 47 */ 48 auto inline property_get_bool(const char *key, int8_t default_value) -> int8_t { 49 if (!key) 50 return default_value; 51 52 int8_t result = default_value; 53 char buf[PROPERTY_VALUE_MAX] = {}; 54 55 int len = property_get(key, buf, ""); 56 if (len == 1) { 57 char ch = buf[0]; 58 if (ch == '0' || ch == 'n') { 59 result = false; 60 } else if (ch == '1' || ch == 'y') { 61 result = true; 62 } 63 } else if (len > 1) { 64 if (!strcmp(buf, "no") || !strcmp(buf, "false") || !strcmp(buf, "off")) { 65 result = false; 66 } else if (!strcmp(buf, "yes") || !strcmp(buf, "true") || 67 !strcmp(buf, "on")) { 68 result = true; 69 } 70 } 71 72 return result; 73 } 74 75 #endif 76 77 class Properties { 78 public: 79 static auto IsPresentFenceNotReliable() -> bool; 80 static auto UseConfigGroups() -> bool; 81 }; 82