utils.h

   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