| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| #include "kudu/util/random_util.h" |
| |
| #include <unistd.h> |
| |
| #include <cstdlib> |
| #include <cstring> |
| #include <string> |
| |
| #include "kudu/gutil/port.h" |
| #include "kudu/gutil/walltime.h" |
| #include "kudu/util/env.h" |
| #include "kudu/util/faststring.h" |
| #include "kudu/util/random.h" |
| |
| using std::string; |
| |
| namespace kudu { |
| |
| void RandomString(void* dest, size_t n, Random* rng) { |
| size_t i = 0; |
| uint32_t random = rng->Next(); |
| char* cdest = static_cast<char*>(dest); |
| static const size_t sz = sizeof(random); |
| if (n >= sz) { |
| for (i = 0; i <= n - sz; i += sz) { |
| memcpy(&cdest[i], &random, sizeof(random)); |
| random = rng->Next(); |
| } |
| } |
| memcpy(cdest + i, &random, n - i); |
| } |
| |
| string RandomString(size_t n, Random* rng) { |
| faststring s; |
| s.resize(n); |
| RandomString(s.data(), n, rng); |
| return s.ToString(); |
| } |
| |
| ATTRIBUTE_NO_SANITIZE_INTEGER |
| uint32_t GetRandomSeed32() { |
| uint32_t seed = static_cast<uint32_t>(GetCurrentTimeMicros()); |
| seed *= getpid(); |
| seed *= Env::Default()->gettid(); |
| return seed; |
| } |
| |
| } // namespace kudu |