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>
29 * calloc_a(size_t len, [void **addr, size_t len,...], NULL)
31 * allocate a block of memory big enough to hold multiple aligned objects.
32 * the pointer to the full object (starting with the first chunk) is returned,
33 * all other pointers are stored in the locations behind extra addr arguments.
34 * the last argument needs to be a NULL pointer
37 #define calloc_a(len, ...) __calloc_a(len, ##__VA_ARGS__, NULL)
39 void *__calloc_a(size_t len, ...);
42 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
45 #define __BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
48 extern int __BUILD_BUG_ON_CONDITION_FAILED;
49 #define BUILD_BUG_ON(condition) \
51 __BUILD_BUG_ON(condition); \
53 __BUILD_BUG_ON_CONDITION_FAILED = 1; \
56 #define BUILD_BUG_ON __BUILD_BUG_ON
61 #include <mach/clock_types.h>
62 #define CLOCK_REALTIME CALENDAR_CLOCK
63 #define CLOCK_MONOTONIC SYSTEM_CLOCK
65 int clock_gettime(int type, struct timespec *tv);
70 #define _GNUC_MIN_VER(maj, min) (((__GNUC__ << 8) + __GNUC_MINOR__) >= (((maj) << 8) + (min)))
72 #define _GNUC_MIN_VER(maj, min) 0
75 #if defined(__linux__) || defined(__CYGWIN__)
79 #elif defined(__APPLE__)
80 #include <machine/endian.h>
81 #include <machine/byte_order.h>
82 #define bswap_32(x) OSSwapInt32(x)
83 #define bswap_64(x) OSSwapInt64(x)
84 #elif defined(__FreeBSD__)
85 #include <sys/endian.h>
86 #define bswap_32(x) bswap32(x)
87 #define bswap_64(x) bswap64(x)
89 #include <machine/endian.h>
90 #define bswap_32(x) swap32(x)
91 #define bswap_64(x) swap64(x)
95 #define __BYTE_ORDER BYTE_ORDER
98 #define __BIG_ENDIAN BIG_ENDIAN
100 #ifndef __LITTLE_ENDIAN
101 #define __LITTLE_ENDIAN LITTLE_ENDIAN
104 static inline uint16_t __u_bswap16(uint16_t val)
106 return ((val >> 8) & 0xffu) | ((val & 0xffu) << 8);
109 #if _GNUC_MIN_VER(4, 2)
110 #define __u_bswap32(x) __builtin_bswap32(x)
111 #define __u_bswap64(x) __builtin_bswap64(x)
113 #define __u_bswap32(x) bswap_32(x)
114 #define __u_bswap64(x) bswap_64(x)
117 #if __BYTE_ORDER == __LITTLE_ENDIAN
119 #define cpu_to_be64(x) __u_bswap64(x)
120 #define cpu_to_be32(x) __u_bswap32(x)
121 #define cpu_to_be16(x) __u_bswap16((uint16_t) (x))
123 #define be64_to_cpu(x) __u_bswap64(x)
124 #define be32_to_cpu(x) __u_bswap32(x)
125 #define be16_to_cpu(x) __u_bswap16((uint16_t) (x))
127 #define cpu_to_le64(x) (x)
128 #define cpu_to_le32(x) (x)
129 #define cpu_to_le16(x) (x)
131 #define le64_to_cpu(x) (x)
132 #define le32_to_cpu(x) (x)
133 #define le16_to_cpu(x) (x)
135 #else /* __BYTE_ORDER == __LITTLE_ENDIAN */
137 #define cpu_to_le64(x) __u_bswap64(x)
138 #define cpu_to_le32(x) __u_bswap32(x)
139 #define cpu_to_le16(x) __u_bswap16((uint16_t) (x))
141 #define le64_to_cpu(x) __u_bswap64(x)
142 #define le32_to_cpu(x) __u_bswap32(x)
143 #define le16_to_cpu(x) __u_bswap16((uint16_t) (x))
145 #define cpu_to_be64(x) (x)
146 #define cpu_to_be32(x) (x)
147 #define cpu_to_be16(x) (x)
149 #define be64_to_cpu(x) (x)
150 #define be32_to_cpu(x) (x)
151 #define be16_to_cpu(x) (x)
156 #define __packed __attribute__((packed))
159 #ifndef __constructor
160 #define __constructor __attribute__((constructor))
164 #define __destructor __attribute__((destructor))
168 #define __hidden __attribute__((visibility("hidden")))
171 #ifndef BITS_PER_LONG
172 #define BITS_PER_LONG (8 * sizeof(unsigned long))
175 #define BITFIELD_SIZE(_n) (((_n) + (BITS_PER_LONG - 1)) / BITS_PER_LONG)
177 static inline void bitfield_set(unsigned long *bits, int bit)
179 bits[bit / BITS_PER_LONG] |= (1UL << (bit % BITS_PER_LONG));
182 static inline bool bitfield_test(unsigned long *bits, int bit)
184 return !!(bits[bit / BITS_PER_LONG] & (1UL << (bit % BITS_PER_LONG)));
187 int b64_encode(const void *src, size_t src_len,
188 void *dest, size_t dest_len);
190 int b64_decode(const void *src, void *dest, size_t dest_len);
192 #define B64_ENCODE_LEN(_len) ((((_len) + 2) / 3) * 4 + 1)
193 #define B64_DECODE_LEN(_len) (((_len) / 4) * 3 + 1)