1 /** 2 * Copyright (c) 2023 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 <cstdint> 17 #include "libpandabase/utils/utils.h" 18 19 namespace panda { 20 CountDigits(uint64_t v)21uint32_t CountDigits(uint64_t v) 22 { 23 constexpr uint64_t POW10_1 = 10ULL; 24 constexpr uint64_t POW10_2 = 100ULL; 25 constexpr uint64_t POW10_3 = 1000ULL; 26 constexpr uint64_t POW10_4 = 10000ULL; 27 uint32_t count = 1U; 28 while (v >= POW10_1) { 29 if (v < POW10_2) { 30 return count + 1U; 31 } 32 if (v < POW10_3) { 33 return count + 2U; 34 } 35 if (v < POW10_4) { 36 return count + 3U; 37 } 38 count += 4U; 39 v /= POW10_4; 40 } 41 return count; 42 } 43 44 } // namespace panda 45