logo

oasis-root

Compiled tree of Oasis Linux based on own branch at <https://hacktivis.me/git/oasis/> git clone https://anongit.hacktivis.me/git/oasis-root.git

stddef.h (1896B)

    

  1. /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2. #ifndef _LINUX_STDDEF_H
  3. #define _LINUX_STDDEF_H
  7. #ifndef __always_inline
  8. #define __always_inline __inline__
  9. #endif
  11. /**
  12.  * __struct_group() - Create a mirrored named and anonyomous struct
  13.  *
  14.  * @TAG: The tag name for the named sub-struct (usually empty)
  15.  * @NAME: The identifier name of the mirrored sub-struct
  16.  * @ATTRS: Any struct attributes (usually empty)
  17.  * @MEMBERS: The member declarations for the mirrored structs
  18.  *
  19.  * Used to create an anonymous union of two structs with identical layout
  20.  * and size: one anonymous and one named. The former's members can be used
  21.  * normally without sub-struct naming, and the latter can be used to
  22.  * reason about the start, end, and size of the group of struct members.
  23.  * The named struct can also be explicitly tagged for layer reuse, as well
  24.  * as both having struct attributes appended.
  25.  */
  26. #define __struct_group(TAG, NAME, ATTRS, MEMBERS...) \
  27. 	union { \
  28. 		struct { MEMBERS } ATTRS; \
  29. 		struct TAG { MEMBERS } ATTRS NAME; \
  30. 	} ATTRS
  32. #ifdef __cplusplus
  33. /* sizeof(struct{}) is 1 in C++, not 0, can't use C version of the macro. */
  34. #define __DECLARE_FLEX_ARRAY(T, member)	\
  35. 	T member[0]
  36. #else
  37. /**
  38.  * __DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union
  39.  *
  40.  * @TYPE: The type of each flexible array element
  41.  * @NAME: The name of the flexible array member
  42.  *
  43.  * In order to have a flexible array member in a union or alone in a
  44.  * struct, it needs to be wrapped in an anonymous struct with at least 1
  45.  * named member, but that member can be empty.
  46.  */
  47. #define __DECLARE_FLEX_ARRAY(TYPE, NAME)	\
  48. 	struct { \
  49. 		struct { } __empty_ ## NAME; \
  50. 		TYPE NAME[]; \
  51. 	}
  52. #endif
  54. #ifndef __counted_by
  55. #define __counted_by(m)
  56. #endif
  58. #ifndef __counted_by_le
  59. #define __counted_by_le(m)
  60. #endif
  62. #ifndef __counted_by_be
  63. #define __counted_by_be(m)
  64. #endif
  66. #endif /* _LINUX_STDDEF_H */