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- /* 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
- #define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
- /**
- * sizeof_field() - Report the size of a struct field in bytes
- *
- * @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() - Report the offset of a struct field within the struct
- *
- * @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))
- /**
- * struct_group() - Wrap a set of declarations in a mirrored struct
- *
- * @NAME: The identifier name of the mirrored sub-struct
- * @MEMBERS: The member declarations for the mirrored structs
- *
- * Used to create an anonymous union of two structs with identical
- * layout and size: one anonymous and one named. The former can be
- * used normally without sub-struct naming, and the latter can be
- * used to reason about the start, end, and size of the group of
- * struct members.
- */
- #define struct_group(NAME, MEMBERS...) \
- __struct_group(/* no tag */, NAME, /* no attrs */, MEMBERS)
- /**
- * struct_group_attr() - Create a struct_group() with trailing attributes
- *
- * @NAME: The identifier name of the mirrored sub-struct
- * @ATTRS: Any struct attributes to apply
- * @MEMBERS: The member declarations for the mirrored structs
- *
- * Used to create an anonymous union of two structs with identical
- * layout and size: one anonymous and one named. The former can be
- * used normally without sub-struct naming, and the latter can be
- * used to reason about the start, end, and size of the group of
- * struct members. Includes structure attributes argument.
- */
- #define struct_group_attr(NAME, ATTRS, MEMBERS...) \
- __struct_group(/* no tag */, NAME, ATTRS, MEMBERS)
- /**
- * struct_group_tagged() - Create a struct_group with a reusable tag
- *
- * @TAG: The tag name for the named sub-struct
- * @NAME: The identifier name of the mirrored sub-struct
- * @MEMBERS: The member declarations for the mirrored structs
- *
- * Used to create an anonymous union of two structs with identical
- * layout and size: one anonymous and one named. The former can be
- * used normally without sub-struct naming, and the latter can be
- * used to reason about the start, end, and size of the group of
- * struct members. Includes struct tag argument for the named copy,
- * so the specified layout can be reused later.
- */
- #define struct_group_tagged(TAG, NAME, MEMBERS...) \
- __struct_group(TAG, NAME, /* no attrs */, MEMBERS)
- /**
- * 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
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