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>
30 * calloc_a(size_t len, [void **addr, size_t len,...], NULL)
32 * allocate a block of memory big enough to hold multiple aligned objects.
33 * the pointer to the full object (starting with the first chunk) is returned,
34 * all other pointers are stored in the locations behind extra addr arguments.
35 * the last argument needs to be a NULL pointer
38 #define calloc_a(len, ...) __calloc_a(len, ##__VA_ARGS__, NULL)
40 void *__calloc_a(size_t len, ...);
43 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
46 #define __BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
49 extern int __BUILD_BUG_ON_CONDITION_FAILED;
50 #define BUILD_BUG_ON(condition) \
52 __BUILD_BUG_ON(condition); \
54 __BUILD_BUG_ON_CONDITION_FAILED = 1; \
57 #define BUILD_BUG_ON __BUILD_BUG_ON
60 #if defined(__APPLE__) && !defined(CLOCK_MONOTONIC)
61 #define LIBUBOX_COMPAT_CLOCK_GETTIME
63 #include <mach/clock_types.h>
64 #define CLOCK_REALTIME CALENDAR_CLOCK
65 #define CLOCK_MONOTONIC SYSTEM_CLOCK
67 int clock_gettime(int type, struct timespec *tv);
72 #define _GNUC_MIN_VER(maj, min) (((__GNUC__ << 8) + __GNUC_MINOR__) >= (((maj) << 8) + (min)))
74 #define _GNUC_MIN_VER(maj, min) 0
77 #if defined(__linux__) || defined(__CYGWIN__)
81 #elif defined(__APPLE__)
82 #include <machine/endian.h>
83 #include <machine/byte_order.h>
84 #elif defined(__FreeBSD__)
85 #include <sys/endian.h>
87 #include <machine/endian.h>
91 #define __BYTE_ORDER BYTE_ORDER
94 #define __BIG_ENDIAN BIG_ENDIAN
96 #ifndef __LITTLE_ENDIAN
97 #define __LITTLE_ENDIAN LITTLE_ENDIAN
100 #define __constant_swap16(x) ((uint16_t)( \
101 (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) | \
102 (((uint16_t)(x) & (uint16_t)0xff00U) >> 8)))
104 #define __constant_swap32(x) ((uint32_t)( \
105 (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \
106 (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \
107 (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \
108 (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
110 #define __constant_swap64(x) ((uint64_t)( \
111 (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \
112 (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
113 (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
114 (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \
115 (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \
116 (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
117 (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
118 (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56)))
121 static inline uint16_t __u_bswap16(uint16_t val)
123 return ((val >> 8) & 0xffu) | ((val & 0xffu) << 8);
126 #if __BYTE_ORDER == __LITTLE_ENDIAN
128 #define cpu_to_be64(x) __constant_swap64(x)
129 #define cpu_to_be32(x) __constant_swap32(x)
130 #define cpu_to_be16(x) __constant_swap16(x)
132 #define be64_to_cpu(x) __constant_swap64(x)
133 #define be32_to_cpu(x) __constant_swap32(x)
134 #define be16_to_cpu(x) __constant_swap16(x)
136 #define cpu_to_le64(x) (x)
137 #define cpu_to_le32(x) (x)
138 #define cpu_to_le16(x) (x)
140 #define le64_to_cpu(x) (x)
141 #define le32_to_cpu(x) (x)
142 #define le16_to_cpu(x) (x)
144 #else /* __BYTE_ORDER == __LITTLE_ENDIAN */
146 #define cpu_to_le64(x) __constant_swap64(x)
147 #define cpu_to_le32(x) __constant_swap32(x)
148 #define cpu_to_le16(x) __constant_swap16(x)
150 #define le64_to_cpu(x) __constant_swap64(x)
151 #define le32_to_cpu(x) __constant_swap32(x)
152 #define le16_to_cpu(x) __constant_swap16(x)
154 #define cpu_to_be64(x) (x)
155 #define cpu_to_be32(x) (x)
156 #define cpu_to_be16(x) (x)
158 #define be64_to_cpu(x) (x)
159 #define be32_to_cpu(x) (x)
160 #define be16_to_cpu(x) (x)
165 #define __packed __attribute__((packed))
168 #ifndef __constructor
169 #define __constructor __attribute__((constructor))
173 #define __destructor __attribute__((destructor))
177 #define __hidden __attribute__((visibility("hidden")))
180 int b64_encode(const void *src, size_t src_len,
181 void *dest, size_t dest_len);
183 int b64_decode(const void *src, void *dest, size_t dest_len);
185 #define B64_ENCODE_LEN(_len) ((((_len) + 2) / 3) * 4 + 1)
186 #define B64_DECODE_LEN(_len) (((_len) / 4) * 3 + 1)
188 static inline unsigned int cbuf_order(unsigned int x)
190 return 32 - __builtin_clz(x - 1);
193 static inline unsigned long cbuf_size(int order)
195 unsigned long page_size = sysconf(_SC_PAGESIZE);
196 unsigned long ret = 1ULL << order;
204 void *cbuf_alloc(unsigned int order);
205 void cbuf_free(void *ptr, unsigned int order);