101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_STDDEF_H
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#define _LINUX_STDDEF_H
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#include <uapi/linux/stddef.h>
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#undef NULL
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#define NULL ((void *)0)
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enum {
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false = 0,
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true = 1
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};
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#undef offsetof
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#ifdef __compiler_offsetof
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#define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER)
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#else
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#define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER)
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#endif
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/**
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* sizeof_field(TYPE, MEMBER)
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*
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* @TYPE: The structure containing the field of interest
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* @MEMBER: The field to return the size of
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*/
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#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
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/**
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* offsetofend(TYPE, MEMBER)
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*
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* @TYPE: The type of the structure
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* @MEMBER: The member within the structure to get the end offset of
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*/
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#define offsetofend(TYPE, MEMBER) \
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(offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
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/**
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* struct_group() - Wrap a set of declarations in a mirrored struct
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*
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* @NAME: The identifier name of the mirrored sub-struct
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* @MEMBERS: The member declarations for the mirrored structs
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*
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* Used to create an anonymous union of two structs with identical
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* layout and size: one anonymous and one named. The former can be
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* used normally without sub-struct naming, and the latter can be
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* used to reason about the start, end, and size of the group of
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* struct members.
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*/
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#define struct_group(NAME, MEMBERS...) \
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__struct_group(/* no tag */, NAME, /* no attrs */, MEMBERS)
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/**
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* struct_group_attr() - Create a struct_group() with trailing attributes
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*
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* @NAME: The identifier name of the mirrored sub-struct
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* @ATTRS: Any struct attributes to apply
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* @MEMBERS: The member declarations for the mirrored structs
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*
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* Used to create an anonymous union of two structs with identical
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* layout and size: one anonymous and one named. The former can be
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* used normally without sub-struct naming, and the latter can be
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* used to reason about the start, end, and size of the group of
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* struct members. Includes structure attributes argument.
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*/
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#define struct_group_attr(NAME, ATTRS, MEMBERS...) \
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__struct_group(/* no tag */, NAME, ATTRS, MEMBERS)
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/**
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* struct_group_tagged() - Create a struct_group with a reusable tag
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*
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* @TAG: The tag name for the named sub-struct
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* @NAME: The identifier name of the mirrored sub-struct
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* @MEMBERS: The member declarations for the mirrored structs
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*
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* Used to create an anonymous union of two structs with identical
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* layout and size: one anonymous and one named. The former can be
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* used normally without sub-struct naming, and the latter can be
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* used to reason about the start, end, and size of the group of
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* struct members. Includes struct tag argument for the named copy,
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* so the specified layout can be reused later.
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*/
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#define struct_group_tagged(TAG, NAME, MEMBERS...) \
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__struct_group(TAG, NAME, /* no attrs */, MEMBERS)
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/**
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* DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union
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*
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* @TYPE: The type of each flexible array element
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* @NAME: The name of the flexible array member
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*
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* In order to have a flexible array member in a union or alone in a
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* struct, it needs to be wrapped in an anonymous struct with at least 1
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* named member, but that member can be empty.
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*/
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#define DECLARE_FLEX_ARRAY(TYPE, NAME) \
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__DECLARE_FLEX_ARRAY(TYPE, NAME)
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#endif
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