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84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/* See the end of this file for copyright and license terms. */
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#pragma once
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#include <gay/cdefs.h>
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#include <gay/types.h>
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/**
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* @brief Get the number of elements in a statically allocated array.
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*
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* @param a The array
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* @returns The number of elements
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*/
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#define ARRAY_SIZE(a) ( sizeof(a) / sizeof((a)[0]) )
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#define abs(x) ({ \
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typeof(x) __x = (x); \
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__x < 0 ? -__x : +__x; \
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})
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#define max(a, b) ({ \
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typeof(a) __a = (a); \
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typeof(b) __b = (b); \
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__a > __b ? __a : __b; \
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})
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#define min(a, b) ({ \
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typeof(a) __a = (a); \
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typeof(b) __b = (b); \
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__a < __b ? __a : __b; \
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})
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/** @brief Get type type of a structure member. */
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#define __typeof_member(type, member) typeof( ((type *)0)->member )
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/**
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* @brief Cast a pointer to a struct member out to the containing structure.
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*
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* @param ptr Pointer to the struct member
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* @param type Type of the containing structure
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* @param member Name of the member within the containing structure
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* @returns Pointer to the containing structure
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*/
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#define container_of(ptr, type, member) ({ \
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/* implicit type check to avoid obvious mistakes */ \
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__typeof_member(type, member) *__membptr = (ptr); \
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(type *)( (void *)__membptr - offsetof(type, member) ); \
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})
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/** @brief Determine whether `ptr` is kinda sus. */
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static __always_inline bool sus_nil(const void *ptr)
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{
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return ptr < (void *)0x1000;
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}
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static __always_inline uintptr_t _align_floor(uintptr_t ptr, usize size)
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{
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return ptr - ptr % size;
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}
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#define align_floor(ptr, size) ( (typeof(ptr))_align_floor((uintptr_t)(ptr), size) )
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static __always_inline uintptr_t _align_ceil(uintptr_t ptr, usize size)
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{
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uintptr_t aligned = ptr - ptr % size;
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if (aligned < ptr)
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aligned += size;
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return aligned;
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}
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#define align_ceil(ptr, size) ( (typeof(ptr))_align_ceil((uintptr_t)(ptr), size) )
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/*
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* This file is part of GayBSD.
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* Copyright (c) 2021 fef <owo@fef.moe>.
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*
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* GayBSD is nonviolent software: you may only use, redistribute, and/or
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* modify it under the terms of the Cooperative Nonviolent Public License
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* (CNPL) as found in the LICENSE file in the source code root directory
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* or at <https://git.pixie.town/thufie/npl-builder>; either version 7
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* of the license, or (at your option) any later version.
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*
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* GayBSD comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPL for details.
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*/
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