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/*!The Treasure Box Library
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright (C) 2009 - 2017, TBOOX Open Source Group.
*
* @author ruki
* @file utils.h
*
*/
#ifndef TB_PREFIX_UTILS_H
#define TB_PREFIX_UTILS_H
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "cpu.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* macros
*/
/// abs
#define tb_abs(x) ((x) > 0? (x) : -(x))
/// max
#define tb_max(x, y) (((x) > (y))? (x) : (y))
/// min
#define tb_min(x, y) (((x) < (y))? (x) : (y))
/// max3
#define tb_max3(x, y, z) (((x) > (y))? (((x) > (z))? (x) : (z)) : (((y) > (z))? (y) : (z)))
/// min3
#define tb_min3(x, y, z) (((x) < (y))? (((x) < (z))? (x) : (z)) : (((y) < (z))? (y) : (z)))
/// the number of entries in the array
#define tb_arrayn(x) ((sizeof((x)) / sizeof((x)[0])))
/// ispow2: 1, 2, 4, 8, 16, 32, ...
#define tb_ispow2(x) (!((x) & ((x) - 1)) && (x))
/// align2
#define tb_align2(x) (((x) + 1) >> 1 << 1)
/// align4
#define tb_align4(x) (((x) + 3) >> 2 << 2)
/// align8
#define tb_align8(x) (((x) + 7) >> 3 << 3)
/// align
#define tb_align(x, b) (((tb_size_t)(x) + ((tb_size_t)(b) - 1)) & ~((tb_size_t)(b) - 1))
/// align u32
#define tb_align_u32(x, b) (((tb_uint32_t)(x) + ((tb_uint32_t)(b) - 1)) & ~((tb_uint32_t)(b) - 1))
/// align u64
#define tb_align_u64(x, b) (((tb_uint64_t)(x) + ((tb_uint64_t)(b) - 1)) & ~((tb_uint64_t)(b) - 1))
/// align by pow2
#define tb_align_pow2(x) (((x) > 1)? (tb_ispow2(x)? (x) : ((tb_size_t)1 << (32 - tb_bits_cl0_u32_be((tb_uint32_t)(x))))) : 1)
/*! @def tb_align_cpu
*
* align by cpu bytes
*/
#if TB_CPU_BIT64
# define tb_align_cpu(x) tb_align8(x)
#else
# define tb_align_cpu(x) tb_align4(x)
#endif
/// offsetof
#if defined(TB_COMPILER_IS_GCC) \
&& TB_COMPILER_VERSION_BE(4, 1)
# define tb_offsetof(s, m) (tb_size_t)__builtin_offsetof(s, m)
#else
# define tb_offsetof(s, m) (tb_size_t)&(((s const*)0)->m)
#endif
/// container of
#define tb_container_of(s, m, p) ((s*)(((tb_byte_t*)(p)) - tb_offsetof(s, m)))
/// memsizeof
#define tb_memsizeof(s, m) sizeof(((s const*)0)->m)
/// memtailof
#define tb_memtailof(s, m) (tb_offsetof(s, m) + tb_memsizeof(s, m))
/// memdiffof: lm - rm
#define tb_memdiffof(s, lm, rm) (tb_memtailof(s, lm) - tb_memtailof(s, rm))
/// check the offset and size of member for struct or union
#define tb_memberof_eq(ls, lm, rs, rm) ((tb_offsetof(ls, lm) == tb_offsetof(rs, rm)) && (tb_memsizeof(ls, lm) == tb_memsizeof(rs, rm)))
/// pointer to bool
#define tb_p2b(x) ((tb_bool_t)(tb_size_t)(x))
/// pointer to u8
#define tb_p2u8(x) ((tb_uint8_t)(tb_size_t)(x))
/// pointer to u16
#define tb_p2u16(x) ((tb_uint16_t)(tb_size_t)(x))
/// pointer to u32
#define tb_p2u32(x) ((tb_uint32_t)(tb_size_t)(x))
/// pointer to u64
#define tb_p2u64(x) ((tb_uint64_t)(tb_size_t)(x))
/// pointer to s8
#define tb_p2s8(x) ((tb_sint8_t)(tb_long_t)(x))
/// pointer to s16
#define tb_p2s16(x) ((tb_sint16_t)(tb_long_t)(x))
/// pointer to s32
#define tb_p2s32(x) ((tb_sint32_t)(tb_long_t)(x))
/// pointer to s64
#define tb_p2s64(x) ((tb_sint64_t)(tb_long_t)(x))
/// bool to pointer
#define tb_b2p(x) ((tb_pointer_t)(tb_size_t)(x))
/// unsigned integer to pointer
#define tb_u2p(x) ((tb_pointer_t)(tb_size_t)(x))
/// integer to pointer
#define tb_i2p(x) ((tb_pointer_t)(tb_long_t)(x))
/// swap
#define tb_swap(t, l, r) do { t __p = (r); (r) = (l); (l) = __p; } while (0)
#endif
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