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//usr/src/linux-headers-5.4.0-216-generic/include/linux/stddef.h
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_STDDEF_H #define _LINUX_STDDEF_H #include <uapi/linux/stddef.h> #undef NULL #define NULL ((void *)0) enum { false = 0, true = 1 }; #undef offsetof #ifdef __compiler_offsetof #define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER) #else #define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER) #endif /** * sizeof_field(TYPE, MEMBER) * * @TYPE: The structure containing the field of interest * @MEMBER: The field to return the size of */ #define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER)) /** * offsetofend(TYPE, MEMBER) * * @TYPE: The type of the structure * @MEMBER: The member within the structure to get the end offset of */ #define offsetofend(TYPE, MEMBER) \ (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER)) /** * DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union * * @TYPE: The type of each flexible array element * @NAME: The name of the flexible array member * * In order to have a flexible array member in a union or alone in a * struct, it needs to be wrapped in an anonymous struct with at least 1 * named member, but that member can be empty. */ #define DECLARE_FLEX_ARRAY(TYPE, NAME) \ __DECLARE_FLEX_ARRAY(TYPE, NAME) #endif