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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* erofs-utils/include/erofs/defs.h
*
* Copyright (C) 2018 HUAWEI, Inc.
* http://www.huawei.com/
* Created by Li Guifu <bluce.liguifu@huawei.com>
* Modified by Gao Xiang <gaoxiang25@huawei.com>
*/
#ifndef __EROFS_DEFS_H
#define __EROFS_DEFS_H
#include <stddef.h>
#include <stdint.h>
#include <assert.h>
#include <inttypes.h>
#include <limits.h>
#include <stdbool.h>
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_LINUX_TYPES_H
#include <linux/types.h>
#endif
/*
* container_of - cast a member of a structure out to the containing structure
* @ptr: the pointer to the member.
* @type: the type of the container struct this is embedded in.
* @member: the name of the member within the struct.
*/
#define container_of(ptr, type, member) ({ \
const typeof(((type *)0)->member) *__mptr = (ptr); \
(type *)((char *)__mptr - offsetof(type, member)); })
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
#ifndef HAVE_LINUX_TYPES_H
typedef u8 __u8;
typedef u16 __u16;
typedef u32 __u32;
typedef u64 __u64;
typedef u16 __le16;
typedef u32 __le32;
typedef u64 __le64;
typedef u16 __be16;
typedef u32 __be32;
typedef u64 __be64;
#endif
typedef int8_t s8;
typedef int16_t s16;
typedef int32_t s32;
typedef int64_t s64;
#if __BYTE_ORDER == __LITTLE_ENDIAN
/*
* The host byte order is the same as network byte order,
* so these functions are all just identity.
*/
#define cpu_to_le16(x) ((__u16)(x))
#define cpu_to_le32(x) ((__u32)(x))
#define cpu_to_le64(x) ((__u64)(x))
#define le16_to_cpu(x) ((__u16)(x))
#define le32_to_cpu(x) ((__u32)(x))
#define le64_to_cpu(x) ((__u64)(x))
#else
#if __BYTE_ORDER == __BIG_ENDIAN
#define cpu_to_le16(x) (__builtin_bswap16(x))
#define cpu_to_le32(x) (__builtin_bswap32(x))
#define cpu_to_le64(x) (__builtin_bswap64(x))
#define le16_to_cpu(x) (__builtin_bswap16(x))
#define le32_to_cpu(x) (__builtin_bswap32(x))
#define le64_to_cpu(x) (__builtin_bswap64(x))
#else
#pragma error
#endif
#endif
#ifndef __OPTIMIZE__
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2 * !!(condition)]))
#else
#define BUILD_BUG_ON(condition) assert(condition)
#endif
#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
#define __round_mask(x, y) ((__typeof__(x))((y)-1))
#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
#define round_down(x, y) ((x) & ~__round_mask(x, y))
/* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
#define roundup(x, y) ( \
{ \
const typeof(y) __y = y; \
(((x) + (__y - 1)) / __y) * __y; \
} \
)
#define rounddown(x, y) ( \
{ \
typeof(x) __x = (x); \
__x - (__x % (y)); \
} \
)
#define min(x, y) ({ \
typeof(x) _min1 = (x); \
typeof(y) _min2 = (y); \
(void) (&_min1 == &_min2); \
_min1 < _min2 ? _min1 : _min2; })
#define max(x, y) ({ \
typeof(x) _max1 = (x); \
typeof(y) _max2 = (y); \
(void) (&_max1 == &_max2); \
_max1 > _max2 ? _max1 : _max2; })
/*
* ..and if you can't take the strict types, you can specify one yourself.
* Or don't use min/max at all, of course.
*/
#define min_t(type, x, y) ({ \
type __min1 = (x); \
type __min2 = (y); \
__min1 < __min2 ? __min1: __min2; })
#define max_t(type, x, y) ({ \
type __max1 = (x); \
type __max2 = (y); \
__max1 > __max2 ? __max1: __max2; })
#define cmpsgn(x, y) ({ \
typeof(x) _x = (x); \
typeof(y) _y = (y); \
(_x > _y) - (_x < _y); })
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
#define BIT(nr) (1UL << (nr))
#define BIT_ULL(nr) (1ULL << (nr))
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
#define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG))
#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
#define BITS_PER_BYTE 8
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
#ifdef __SIZEOF_LONG__
#define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
#else
#define BITS_PER_LONG __WORDSIZE
#endif
#define BUG_ON(cond) assert(!(cond))
#ifdef NDEBUG
#define DBG_BUGON(condition) ((void)(condition))
#else
#define DBG_BUGON(condition) BUG_ON(condition)
#endif
#ifndef __maybe_unused
#define __maybe_unused __attribute__((__unused__))
#endif
#endif
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