summaryrefslogtreecommitdiff
path: root/cross/lib/flexmember.h
diff options
context:
space:
mode:
Diffstat (limited to 'cross/lib/flexmember.h')
-rw-r--r--cross/lib/flexmember.h60
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))