2 * utils - misc libubox utility functions
4 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
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.
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.
19 #ifndef __LIBUBOX_UTILS_H
20 #define __LIBUBOX_UTILS_H
22 #include <sys/types.h>
27 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
31 #define _GNUC_MIN_VER(maj, min) (((__GNUC__ << 8) + __GNUC_MINOR__) >= (((maj) << 8) + (min)))
33 #define _GNUC_MIN_VER(maj, min) 0
36 #if defined(__linux__) || defined(__CYGWIN__)
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)
50 #include <machine/endian.h>
51 #define bswap_32(x) swap32(x)
52 #define bswap_64(x) swap64(x)
56 #define __BYTE_ORDER BYTE_ORDER
59 #define __BIG_ENDIAN BIG_ENDIAN
61 #ifndef __LITTLE_ENDIAN
62 #define __LITTLE_ENDIAN LITTLE_ENDIAN
65 static inline uint16_t __u_bswap16(uint16_t val
)
67 return ((val
>> 8) & 0xffu
) | ((val
& 0xffu
) << 8);
70 #if _GNUC_MIN_VER(4, 2)
71 #define __u_bswap32(x) __builtin_bswap32(x)
72 #define __u_bswap64(x) __builtin_bswap64(x)
74 #define __u_bswap32(x) bswap_32(x)
75 #define __u_bswap64(x) bswap_64(x)
78 #if __BYTE_ORDER == __LITTLE_ENDIAN
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))
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))
88 #define cpu_to_le64(x) (x)
89 #define cpu_to_le32(x) (x)
90 #define cpu_to_le16(x) (x)
92 #define le64_to_cpu(x) (x)
93 #define le32_to_cpu(x) (x)
94 #define le16_to_cpu(x) (x)
96 #else /* __BYTE_ORDER == __LITTLE_ENDIAN */
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))
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))
106 #define cpu_to_be64(x) (x)
107 #define cpu_to_be32(x) (x)
108 #define cpu_to_be16(x) (x)
110 #define be64_to_cpu(x) (x)
111 #define be32_to_cpu(x) (x)
112 #define be16_to_cpu(x) (x)