1/* 2 * Copyright (c) 2021-2023 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 /** 17 * @file pubdef.h 18 * 19 * @brief The file contains macro definitions for some basic functions 20 * in c_utils, for example, unit conversion and space freeup. 21 */ 22 23#ifndef UTILS_BASE_PUBDEF_H 24#define UTILS_BASE_PUBDEF_H 25 26namespace OHOS { 27 28// Used for unit conversion from byte to megabyte 29#define B_TO_M(b) ((b) / 1024 / 1024) 30// Used for unit conversion from megabyte to byte 31#define M_TO_B(m) ((m) * 1024 * 1024) 32// Used for unit conversion from byte to kilobyte 33#define B_TO_K(b) ((b) / 1024) 34// Used for unit conversion from kilobyte to byte 35#define K_TO_B(m) ((m) * 1024) 36 37// Used for unit conversion from hour to second 38#define HOUR_TO_SECOND(h) ((h) * 3600) 39// Used for unit conversion from second to hour 40#define SECOND_TO_HOUR(s) ((s) / 3600) 41 42// Used to return the array size 43#define ARRAY_SIZE(a) (sizeof((a)) / sizeof((a[0]))) 44 45// Used to free the space pointed by pointer p 46#define FREE_AND_NIL(p) do {if (p) { delete (p); (p) = nullptr;}} while (0) 47// Used to free the array space pointed by pointer p 48#define FREE_AND_NIL_ARRAY(p) do {if (p) {delete[] (p); (p) = nullptr;}} while (0) 49 50// Used to return the maximum of two numbers 51#define MAX(x, y) (((x) > (y)) ? (x) : (y)) 52// Used to return the minimum of two numbers 53#define MIN(x, y) (((x) < (y)) ? (x) : (y)) 54 55// Used to determine whether float number 'x' is 0 56#define EPS (1e-8) 57#define EQUAL_TO_ZERO(x) (fabs(x) <= (EPS)) 58 59// Used to attempt a retry when the syscall error code is EINTR 60#ifndef TEMP_FAILURE_RETRY 61#define TEMP_FAILURE_RETRY(exp) \ 62 ({ \ 63 decltype(exp) _rc; \ 64 do { \ 65 _rc = (exp); \ 66 } while ((_rc == -1) && (errno == EINTR)); \ 67 _rc; \ 68 }) 69#endif 70} 71 72#endif 73 74