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