1 /* 2 * utils - misc libubox utility functions 3 * 4 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org> 5 * 6 * Permission to use, copy, modify, and/or distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #ifndef __LIBUBOX_UTILS_H 20 #define __LIBUBOX_UTILS_H 21 22 #include <sys/types.h> 23 #include <stdint.h> 24 #include <stdbool.h> 25 26 #ifndef ARRAY_SIZE 27 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) 28 #endif 29 30 #ifdef __GNUC__ 31 #define _GNUC_MIN_VER(maj, min) (((__GNUC__ << 8) + __GNUC_MINOR__) >= (((maj) << 8) + (min))) 32 #else 33 #define _GNUC_MIN_VER(maj, min) 0 34 #endif 35 36 #if defined(__linux__) || defined(__CYGWIN__) 37 #include <byteswap.h> 38 #include <endian.h> 39 40 #elif defined(__APPLE__) 41 #include <machine/endian.h> 42 #include <machine/byte_order.h> 43 #define bswap_32(x) OSSwapInt32(x) 44 #define bswap_64(x) OSSwapInt64(x) 45 #elif defined(__FreeBSD__) 46 #include <sys/endian.h> 47 #define bswap_32(x) bswap32(x) 48 #define bswap_64(x) bswap64(x) 49 #else 50 #include <machine/endian.h> 51 #define bswap_32(x) swap32(x) 52 #define bswap_64(x) swap64(x) 53 #endif 54 55 #ifndef __BYTE_ORDER 56 #define __BYTE_ORDER BYTE_ORDER 57 #endif 58 #ifndef __BIG_ENDIAN 59 #define __BIG_ENDIAN BIG_ENDIAN 60 #endif 61 #ifndef __LITTLE_ENDIAN 62 #define __LITTLE_ENDIAN LITTLE_ENDIAN 63 #endif 64 65 static inline uint16_t __u_bswap16(uint16_t val) 66 { 67 return ((val >> 8) & 0xffu) | ((val & 0xffu) << 8); 68 } 69 70 #if _GNUC_MIN_VER(4, 2) 71 #define __u_bswap32(x) __builtin_bswap32(x) 72 #define __u_bswap64(x) __builtin_bswap64(x) 73 #else 74 #define __u_bswap32(x) bswap_32(x) 75 #define __u_bswap64(x) bswap_64(x) 76 #endif 77 78 #if __BYTE_ORDER == __LITTLE_ENDIAN 79 80 #define cpu_to_be64(x) __u_bswap64(x) 81 #define cpu_to_be32(x) __u_bswap32(x) 82 #define cpu_to_be16(x) __u_bswap16((uint16_t) (x)) 83 84 #define be64_to_cpu(x) __u_bswap64(x) 85 #define be32_to_cpu(x) __u_bswap32(x) 86 #define be16_to_cpu(x) __u_bswap16((uint16_t) (x)) 87 88 #define cpu_to_le64(x) (x) 89 #define cpu_to_le32(x) (x) 90 #define cpu_to_le16(x) (x) 91 92 #define le64_to_cpu(x) (x) 93 #define le32_to_cpu(x) (x) 94 #define le16_to_cpu(x) (x) 95 96 #else /* __BYTE_ORDER == __LITTLE_ENDIAN */ 97 98 #define cpu_to_le64(x) __u_bswap64(x) 99 #define cpu_to_le32(x) __u_bswap32(x) 100 #define cpu_to_le16(x) __u_bswap16((uint16_t) (x)) 101 102 #define le64_to_cpu(x) __u_bswap64(x) 103 #define le32_to_cpu(x) __u_bswap32(x) 104 #define le16_to_cpu(x) __u_bswap16((uint16_t) (x)) 105 106 #define cpu_to_be64(x) (x) 107 #define cpu_to_be32(x) (x) 108 #define cpu_to_be16(x) (x) 109 110 #define be64_to_cpu(x) (x) 111 #define be32_to_cpu(x) (x) 112 #define be16_to_cpu(x) (x) 113 114 #endif 115 116 #endif 117
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