1 /*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15 #define LOG_TAG "Constant"
16 #include "utils/constant.h"
17
18 #include <cerrno>
19 #include <dirent.h>
20 #include <fstream>
21 #include <unistd.h>
22 #include "log_print.h"
23
24 namespace OHOS {
25 namespace DistributedData {
26 constexpr const char *Constant::KEY_SEPARATOR;
Concatenate(std::initializer_list<std::string> stringList)27 std::string Constant::Concatenate(std::initializer_list<std::string> stringList)
28 {
29 std::string result;
30 size_t result_size = 0;
31 for (const std::string &str : stringList) {
32 result_size += str.size();
33 }
34 result.reserve(result_size);
35 for (const std::string &str : stringList) {
36 result.append(str.data(), str.size());
37 }
38 return result;
39 }
40
Join(const std::string & prefix,const std::string & separator,std::initializer_list<std::string> params)41 std::string Constant::Join(const std::string &prefix, const std::string &separator,
42 std::initializer_list<std::string> params)
43 {
44 std::string::size_type size = prefix.size();
45 for (const std::string ¶m : params) {
46 size += separator.size() + param.size();
47 }
48 std::string result;
49 result.reserve(size);
50 result.append(prefix);
51 for (const std::string &str : params) {
52 result.append(separator).append(str);
53 }
54 return result;
55 }
56
Equal(bool first,bool second)57 bool Constant::Equal(bool first, bool second)
58 {
59 return (first && second) || (!first && !second);
60 }
61
NotEqual(bool first,bool second)62 bool Constant::NotEqual(bool first, bool second)
63 {
64 return (first || second) && (!first || !second);
65 }
66
IsBackground(pid_t pid)67 bool Constant::IsBackground(pid_t pid)
68 {
69 std::ifstream ifs("/proc/" + std::to_string(pid) + "/cgroup", std::ios::in);
70 ZLOGD("pid %d open %d", pid, ifs.good());
71 if (!ifs.good()) {
72 return false;
73 }
74
75 while (!ifs.eof()) {
76 const int MAX_LEN = 256; // enough
77 char buffer[MAX_LEN] = { 0 };
78 ifs.getline(buffer, sizeof(buffer));
79 std::string line = buffer;
80
81 size_t pos = line.find("background");
82 if (pos != std::string::npos) {
83 return true;
84 }
85 }
86 return false;
87 }
88 } // namespace DistributedData
89 } // namespace OHOS
90