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
16 #include "dm_random.h"
17
18 #include <random>
19
20 #if defined(__LITEOS_M__)
21 #include <time.h>
22 #endif
23
24 namespace OHOS {
25 namespace DistributedHardware {
GenRandInt(int32_t randMin,int32_t randMax)26 int32_t GenRandInt(int32_t randMin, int32_t randMax)
27 {
28 #if defined(__LITEOS_M__)
29 srandom(time(NULL));
30 return (randMin + random() % (randMax - randMin));
31 #else
32 std::random_device randDevice;
33 std::mt19937 genRand(randDevice());
34 std::uniform_int_distribution<int> disRand(randMin, randMax);
35 return disRand(genRand);
36 #endif
37 }
38
GenRandLongLong(int64_t randMin,int64_t randMax)39 int64_t GenRandLongLong(int64_t randMin, int64_t randMax)
40 {
41 std::random_device randDevice;
42 std::mt19937 genRand(randDevice());
43 std::uniform_int_distribution<long long> disRand(randMin, randMax);
44 return disRand(genRand);
45 }
46 } // namespace DistributedHardware
47 } // namespace OHOS
48