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78 lines
2.1 KiB
C
78 lines
2.1 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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/**
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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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((type *)( (void *)(ptr) - offsetof(type, member) ))
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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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/**
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* @brief Align `ptr` such that `ptr % n == 0`.
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*
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* @param ptr Pointer to align
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* @param log The log2 of the alignment. If negative, the pointer will be
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* aligned to the next lower address, otherwise to the next higher one.
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* @returns The aligned pointer
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*/
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void *ptr_align(void *ptr, int log);
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static __always_inline uintptr_t uintptr_align(uintptr_t ptr, int log)
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{
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return (uintptr_t)ptr_align((void *)ptr, log);
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}
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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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