| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed 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 <gtest/gtest.h> |
| #include <sys/param.h> |
| |
| TEST(sys_param_test, powerof2_positives) { |
| ASSERT_TRUE(powerof2(1)); |
| ASSERT_TRUE(powerof2(2)); |
| ASSERT_TRUE(powerof2(4)); |
| ASSERT_TRUE(powerof2(8)); |
| ASSERT_FALSE(powerof2(3)); |
| ASSERT_FALSE(powerof2(5)); |
| ASSERT_FALSE(powerof2(7)); |
| ASSERT_FALSE(powerof2(9)); |
| ASSERT_FALSE(powerof2(10)); |
| } |
| |
| TEST(sys_param_test, powerof2_zero) { |
| // 0 isn't a power of 2, but for compatibility, we assume it is. |
| ASSERT_TRUE(powerof2(0)); |
| uint32_t zero = 0; |
| ASSERT_TRUE(powerof2(zero)); |
| } |
| |
| TEST(sys_param_test, powerof2_negatives) { |
| // negative numbers can never be a power of 2, but for compatibility, |
| // we assume they can be. |
| int32_t min32 = INT32_MIN; |
| int64_t min64 = INT64_MIN; |
| ASSERT_TRUE(powerof2(min32)); |
| ASSERT_FALSE(powerof2(min32 + 1)); |
| ASSERT_TRUE(powerof2(min64)); |
| ASSERT_FALSE(powerof2(min64 + 1)); |
| } |