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
23 #include <sys/types.h>
31 * calloc_a(size_t len, [void **addr, size_t len,...], NULL)
33 * allocate a block of memory big enough to hold multiple aligned objects.
34 * the pointer to the full object (starting with the first chunk) is returned,
35 * all other pointers are stored in the locations behind extra addr arguments.
36 * the last argument needs to be a NULL pointer
39 #define calloc_a(len, ...) __calloc_a(len, ##__VA_ARGS__, NULL)
41 void *__calloc_a(size_t len
, ...);
44 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
47 #define __BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
50 extern int __BUILD_BUG_ON_CONDITION_FAILED
;
51 #define BUILD_BUG_ON(condition) \
53 __BUILD_BUG_ON(condition); \
55 __BUILD_BUG_ON_CONDITION_FAILED = 1; \
58 #define BUILD_BUG_ON __BUILD_BUG_ON
61 #if defined(__APPLE__) && !defined(CLOCK_MONOTONIC)
62 #define LIBUBOX_COMPAT_CLOCK_GETTIME
64 #include <mach/clock_types.h>
65 #define CLOCK_REALTIME CALENDAR_CLOCK
66 #define CLOCK_MONOTONIC SYSTEM_CLOCK
68 int clock_gettime(int type
, struct timespec
*tv
);
73 #define _GNUC_MIN_VER(maj, min) (((__GNUC__ << 8) + __GNUC_MINOR__) >= (((maj) << 8) + (min)))
75 #define _GNUC_MIN_VER(maj, min) 0
78 #if defined(__linux__) || defined(__CYGWIN__)
82 #elif defined(__APPLE__)
83 #include <machine/endian.h>
84 #include <machine/byte_order.h>
85 #elif defined(__FreeBSD__)
86 #include <sys/endian.h>
88 #include <machine/endian.h>
92 #define __BYTE_ORDER BYTE_ORDER
95 #define __BIG_ENDIAN BIG_ENDIAN
97 #ifndef __LITTLE_ENDIAN
98 #define __LITTLE_ENDIAN LITTLE_ENDIAN
101 #define __constant_swap16(x) ((uint16_t)( \
102 (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) | \
103 (((uint16_t)(x) & (uint16_t)0xff00U) >> 8)))
105 #define __constant_swap32(x) ((uint32_t)( \
106 (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \
107 (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \
108 (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \
109 (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
111 #define __constant_swap64(x) ((uint64_t)( \
112 (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \
113 (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
114 (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
115 (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \
116 (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \
117 (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
118 (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
119 (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56)))
122 * This returns a constant expression while determining if an argument is
123 * a constant expression, most importantly without evaluating the argument.
125 #define __is_constant(x) \
126 (sizeof(int) == sizeof(*(1 ? ((void*)((long)(x) * 0l)) : (int*)1)))
128 #define __eval_once(func, x) \
129 ({ __typeof__(x) __x = x; func(__x); })
133 * g++ does not support __builtin_choose_expr, so always use __eval_once.
134 * Unfortunately this means that the byte order functions can't be used
135 * as a constant expression anymore
137 #define __eval_safe(func, x) __eval_once(func, x)
139 #define __eval_safe(func, x) \
140 __builtin_choose_expr(__is_constant(x), \
141 func(x), __eval_once(func, x))
144 #if __BYTE_ORDER == __LITTLE_ENDIAN
146 #define const_cpu_to_be64(x) __constant_swap64(x)
147 #define const_cpu_to_be32(x) __constant_swap32(x)
148 #define const_cpu_to_be16(x) __constant_swap16(x)
150 #define const_be64_to_cpu(x) __constant_swap64(x)
151 #define const_be32_to_cpu(x) __constant_swap32(x)
152 #define const_be16_to_cpu(x) __constant_swap16(x)
154 #define const_cpu_to_le64(x) (x)
155 #define const_cpu_to_le32(x) (x)
156 #define const_cpu_to_le16(x) (x)
158 #define const_le64_to_cpu(x) (x)
159 #define const_le32_to_cpu(x) (x)
160 #define const_le16_to_cpu(x) (x)
162 #define cpu_to_be64(x) __eval_safe(__constant_swap64, x)
163 #define cpu_to_be32(x) __eval_safe(__constant_swap32, x)
164 #define cpu_to_be16(x) __eval_safe(__constant_swap16, x)
166 #define be64_to_cpu(x) __eval_safe(__constant_swap64, x)
167 #define be32_to_cpu(x) __eval_safe(__constant_swap32, x)
168 #define be16_to_cpu(x) __eval_safe(__constant_swap16, x)
170 #define cpu_to_le64(x) (x)
171 #define cpu_to_le32(x) (x)
172 #define cpu_to_le16(x) (x)
174 #define le64_to_cpu(x) (x)
175 #define le32_to_cpu(x) (x)
176 #define le16_to_cpu(x) (x)
178 #else /* __BYTE_ORDER == __LITTLE_ENDIAN */
180 #define const_cpu_to_le64(x) __constant_swap64(x)
181 #define const_cpu_to_le32(x) __constant_swap32(x)
182 #define const_cpu_to_le16(x) __constant_swap16(x)
184 #define const_le64_to_cpu(x) __constant_swap64(x)
185 #define const_le32_to_cpu(x) __constant_swap32(x)
186 #define const_le16_to_cpu(x) __constant_swap16(x)
188 #define const_cpu_to_be64(x) (x)
189 #define const_cpu_to_be32(x) (x)
190 #define const_cpu_to_be16(x) (x)
192 #define const_be64_to_cpu(x) (x)
193 #define const_be32_to_cpu(x) (x)
194 #define const_be16_to_cpu(x) (x)
196 #define cpu_to_le64(x) __eval_safe(__constant_swap64, x)
197 #define cpu_to_le32(x) __eval_safe(__constant_swap32, x)
198 #define cpu_to_le16(x) __eval_safe(__constant_swap16, x)
200 #define le64_to_cpu(x) __eval_safe(__constant_swap64, x)
201 #define le32_to_cpu(x) __eval_safe(__constant_swap32, x)
202 #define le16_to_cpu(x) __eval_safe(__constant_swap16, x)
204 #define cpu_to_be64(x) (x)
205 #define cpu_to_be32(x) (x)
206 #define cpu_to_be16(x) (x)
208 #define be64_to_cpu(x) (x)
209 #define be32_to_cpu(x) (x)
210 #define be16_to_cpu(x) (x)
215 #define __packed __attribute__((packed))
218 #ifndef __constructor
219 #define __constructor __attribute__((constructor))
223 #define __destructor __attribute__((destructor))
227 #define __hidden __attribute__((visibility("hidden")))
230 #ifndef __has_attribute
231 # define __has_attribute(x) 0
235 # if __has_attribute(__fallthrough__)
236 # define fallthrough __attribute__((__fallthrough__))
238 # define fallthrough do {} while (0) /* fallthrough */
242 int b64_encode(const void *src
, size_t src_len
,
243 void *dest
, size_t dest_len
);
245 int b64_decode(const void *src
, void *dest
, size_t dest_len
);
247 #define B64_ENCODE_LEN(_len) ((((_len) + 2) / 3) * 4 + 1)
248 #define B64_DECODE_LEN(_len) (((_len) / 4) * 3 + 1)
250 static inline unsigned int cbuf_order(unsigned int x
)
252 return 32 - __builtin_clz(x
- 1);
255 static inline unsigned long cbuf_size(int order
)
257 unsigned long page_size
= sysconf(_SC_PAGESIZE
);
258 unsigned long ret
= 1ULL << order
;
266 void *cbuf_alloc(unsigned int order
);
267 void cbuf_free(void *ptr
, unsigned int order
);
268 int mkdir_p(char *dir
, mode_t mask
);