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Diffstat (limited to 'cross/lib/flexmember.h')
-rw-r--r-- | cross/lib/flexmember.h | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/cross/lib/flexmember.h b/cross/lib/flexmember.h deleted file mode 100644 index a6cc876a6d5..00000000000 --- a/cross/lib/flexmember.h +++ /dev/null @@ -1,60 +0,0 @@ -/* Sizes of structs with flexible array members. - - Copyright 2016-2023 Free Software Foundation, Inc. - - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <https://www.gnu.org/licenses/>. - - Written by Paul Eggert. */ - -#include <stddef.h> - -/* Nonzero multiple of alignment of TYPE, suitable for FLEXSIZEOF below. - On older platforms without _Alignof, use a pessimistic bound that is - safe in practice even if FLEXIBLE_ARRAY_MEMBER is 1. - On newer platforms, use _Alignof to get a tighter bound. */ - -#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112 -# define FLEXALIGNOF(type) (sizeof (type) & ~ (sizeof (type) - 1)) -#else -# define FLEXALIGNOF(type) _Alignof (type) -#endif - -/* Yield a properly aligned upper bound on the size of a struct of - type TYPE with a flexible array member named MEMBER that is - followed by N bytes of other data. The result is suitable as an - argument to malloc. For example: - - struct s { int n; char d[FLEXIBLE_ARRAY_MEMBER]; }; - struct s *p = malloc (FLEXSIZEOF (struct s, d, n * sizeof (char))); - - FLEXSIZEOF (TYPE, MEMBER, N) is not simply (sizeof (TYPE) + N), - since FLEXIBLE_ARRAY_MEMBER may be 1 on pre-C11 platforms. Nor is - it simply (offsetof (TYPE, MEMBER) + N), as that might yield a size - that causes malloc to yield a pointer that is not properly aligned - for TYPE; for example, if sizeof (int) == alignof (int) == 4, - malloc (offsetof (struct s, d) + 3 * sizeof (char)) is equivalent - to malloc (7) and might yield a pointer that is not a multiple of 4 - (which means the pointer is not properly aligned for struct s), - whereas malloc (FLEXSIZEOF (struct s, d, 3 * sizeof (char))) is - equivalent to malloc (8) and must yield a pointer that is a - multiple of 4. - - Yield a value less than N if and only if arithmetic overflow occurs. */ - -#define FLEXSIZEOF(type, member, n) \ - ((offsetof (type, member) + FLEXALIGNOF (type) - 1 + (n)) \ - & ~ (FLEXALIGNOF (type) - 1)) |