/* * utils - misc libubox utility functions * * Copyright (C) 2012 Felix Fietkau * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef __LIBUBOX_UTILS_H #define __LIBUBOX_UTILS_H #include #include #include #include #include #include /* * calloc_a(size_t len, [void **addr, size_t len,...], NULL) * * allocate a block of memory big enough to hold multiple aligned objects. * the pointer to the full object (starting with the first chunk) is returned, * all other pointers are stored in the locations behind extra addr arguments. * the last argument needs to be a NULL pointer */ #define calloc_a(len, ...) __calloc_a(len, ##__VA_ARGS__, NULL) void *__calloc_a(size_t len, ...); #ifndef ARRAY_SIZE #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) #endif #define __BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) #ifdef __OPTIMIZE__ extern int __BUILD_BUG_ON_CONDITION_FAILED; #define BUILD_BUG_ON(condition) \ do { \ __BUILD_BUG_ON(condition); \ if (condition) \ __BUILD_BUG_ON_CONDITION_FAILED = 1; \ } while(0) #else #define BUILD_BUG_ON __BUILD_BUG_ON #endif #if defined(__APPLE__) && !defined(CLOCK_MONOTONIC) #define LIBUBOX_COMPAT_CLOCK_GETTIME #include #define CLOCK_REALTIME CALENDAR_CLOCK #define CLOCK_MONOTONIC SYSTEM_CLOCK int clock_gettime(int type, struct timespec *tv); #endif #ifdef __GNUC__ #define _GNUC_MIN_VER(maj, min) (((__GNUC__ << 8) + __GNUC_MINOR__) >= (((maj) << 8) + (min))) #else #define _GNUC_MIN_VER(maj, min) 0 #endif #if defined(__linux__) || defined(__CYGWIN__) #include #include #elif defined(__APPLE__) #include #include #elif defined(__FreeBSD__) #include #else #include #endif #ifndef __BYTE_ORDER #define __BYTE_ORDER BYTE_ORDER #endif #ifndef __BIG_ENDIAN #define __BIG_ENDIAN BIG_ENDIAN #endif #ifndef __LITTLE_ENDIAN #define __LITTLE_ENDIAN LITTLE_ENDIAN #endif #define __constant_swap16(x) ((uint16_t)( \ (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) | \ (((uint16_t)(x) & (uint16_t)0xff00U) >> 8))) #define __constant_swap32(x) ((uint32_t)( \ (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \ (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \ (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \ (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24))) #define __constant_swap64(x) ((uint64_t)( \ (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \ (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \ (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \ (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \ (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \ (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \ (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \ (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56))) /* * This returns a constant expression while determining if an argument is * a constant expression, most importantly without evaluating the argument. */ #define __is_constant(x) \ (sizeof(int) == sizeof(*(1 ? ((void*)((long)(x) * 0l)) : (int*)1))) #define __eval_once(func, x) \ ({ __typeof__(x) __x = x; func(__x); }) #ifdef __cplusplus /* * g++ does not support __builtin_choose_expr, so always use __eval_once. * Unfortunately this means that the byte order functions can't be used * as a constant expression anymore */ #define __eval_safe(func, x) __eval_once(func, x) #else #define __eval_safe(func, x) \ __builtin_choose_expr(__is_constant(x), \ func(x), __eval_once(func, x)) #endif #if __BYTE_ORDER == __LITTLE_ENDIAN #define cpu_to_be64(x) __eval_safe(__constant_swap64, x) #define cpu_to_be32(x) __eval_safe(__constant_swap32, x) #define cpu_to_be16(x) __eval_safe(__constant_swap16, x) #define be64_to_cpu(x) __eval_safe(__constant_swap64, x) #define be32_to_cpu(x) __eval_safe(__constant_swap32, x) #define be16_to_cpu(x) __eval_safe(__constant_swap16, x) #define cpu_to_le64(x) (x) #define cpu_to_le32(x) (x) #define cpu_to_le16(x) (x) #define le64_to_cpu(x) (x) #define le32_to_cpu(x) (x) #define le16_to_cpu(x) (x) #else /* __BYTE_ORDER == __LITTLE_ENDIAN */ #define cpu_to_le64(x) __eval_safe(__constant_swap64, x) #define cpu_to_le32(x) __eval_safe(__constant_swap32, x) #define cpu_to_le16(x) __eval_safe(__constant_swap16, x) #define le64_to_cpu(x) __eval_safe(__constant_swap64, x) #define le32_to_cpu(x) __eval_safe(__constant_swap32, x) #define le16_to_cpu(x) __eval_safe(__constant_swap16, x) #define cpu_to_be64(x) (x) #define cpu_to_be32(x) (x) #define cpu_to_be16(x) (x) #define be64_to_cpu(x) (x) #define be32_to_cpu(x) (x) #define be16_to_cpu(x) (x) #endif #ifndef __packed #define __packed __attribute__((packed)) #endif #ifndef __constructor #define __constructor __attribute__((constructor)) #endif #ifndef __destructor #define __destructor __attribute__((destructor)) #endif #ifndef __hidden #define __hidden __attribute__((visibility("hidden"))) #endif int b64_encode(const void *src, size_t src_len, void *dest, size_t dest_len); int b64_decode(const void *src, void *dest, size_t dest_len); #define B64_ENCODE_LEN(_len) ((((_len) + 2) / 3) * 4 + 1) #define B64_DECODE_LEN(_len) (((_len) / 4) * 3 + 1) static inline unsigned int cbuf_order(unsigned int x) { return 32 - __builtin_clz(x - 1); } static inline unsigned long cbuf_size(int order) { unsigned long page_size = sysconf(_SC_PAGESIZE); unsigned long ret = 1ULL << order; if (ret < page_size) ret = page_size; return ret; } void *cbuf_alloc(unsigned int order); void cbuf_free(void *ptr, unsigned int order); #endif