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103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
/* See the end of this file for copyright and license terms. */
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#pragma once
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#include "neo/_types.h"
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/**
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* @defgroup stddef Core Macros
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*
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* @{
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*/
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#ifdef __cplusplus
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# define nil nullptr
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#else
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/** @brief Null pointer. */
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# define nil ((void *)0)
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#endif
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#ifndef offsetof
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/**
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* @brief Get the byte offset of a member within a struct.
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*
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* @param type Type of the structure
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* @param member Name of the member within the struct
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* @returns The byte offset of `member` within `type`
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*/
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# define offsetof(type, member) __builtin_offsetof(type, member)
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#endif
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#ifndef typeof
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/**
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* @brief Get the type an expression evaluates to (for generic macros).
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*
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* @param expr Expression to get the type of
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* @returns The type, can be used for casting or declarations
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*/
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# define typeof(expr) __typeof(expr)
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#endif
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/**
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* @brief Get the absolute (non negative) value of an integer.
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*
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* @param n The integer
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* @returns The absolute value
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*/
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#define nabs(n) ({ \
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typeof(n) __n = (n); \
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__n < 0 ? -__n : __n; \
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})
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/**
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* @brief Get the maximum value of two integer expressions.
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*
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* @param x1 First expression
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* @param x2 Second expression
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* @returns The bigger value
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*/
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#define nmax(x1, x2) ({ \
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typeof(x1) __x1 = (x1); \
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typeof(x2) __x2 = (x2); \
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__x1 > __x2 ? __x1 : __x2; \
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})
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/**
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* @brief Get the minimum value of two integer expressions.
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*
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* @param x1 First expression
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* @param x2 Second expression
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* @returns The smaller value
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*/
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#define nmin(x1, x2) ({ \
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typeof(x1) __x1 = (x1); \
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typeof(x2) __x2 = (x2); \
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__x1 < __x2 ? __x1 : __x2; \
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})
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/**
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* @brief Get the length of a data structure embedding `NLEN_FIELD`.
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*
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* Quickly get the length (as in amount of items, not bytes) of any libneo data
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* structure that supports it. This includes strings, buffers, lists, and more.
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*
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* @param thing Thing to get the length of
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* @returns The length as a `const usize`
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*/
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#define nlen(thing) ((thing)->__neo_nlen)
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/** @} */
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/*
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* This file is part of libneo.
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* Copyright (c) 2021 Fefie <owo@fef.moe>.
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*
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* libneo is non-violent software: you may only use, redistribute,
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* and/or modify it under the terms of the CNPLv6+ as found in
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* the LICENSE file in the source code root directory or at
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* <https://git.pixie.town/thufie/CNPL>.
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*
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* libneo comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPLv6+ for details.
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*/
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