diff options
| author | Robert Clausecker <fuz@FreeBSD.org> | 2025-11-10 17:54:41 +0000 |
|---|---|---|
| committer | Robert Clausecker <fuz@FreeBSD.org> | 2025-11-12 12:23:09 +0000 |
| commit | 6c57e368eb1777f6097158eeca2fcc175d068dba (patch) | |
| tree | d4beaf080335301d96832ff471f64e2fc136b94b /include/stdlib.h | |
| parent | 4ab2d625e1462e9a78cb8086906c1a3da3aa6713 (diff) | |
lib/libc: implement C23 memalignment()
This new function computes the alignment of a pointer.
It is part of ISO/IEC 9899:2024, the new C standard.
If the pointer is a null pointer, null is returned.
I have tried to write an implementation that can cope
with traditional address-based architectures, even if
size_t and uintptr_t are of different length. Adjustments
may be needed for CHERI though.
A man page is provided, too. No unit test for now.
Reviewed by: kib, imp, ziaee (manpages), pauamma@gundo.com
Approved by: markj (mentor)
MFC after: 1 month
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D53673
Diffstat (limited to 'include/stdlib.h')
| -rw-r--r-- | include/stdlib.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/stdlib.h b/include/stdlib.h index 784cb63bfc5b..3e54b5feb6de 100644 --- a/include/stdlib.h +++ b/include/stdlib.h @@ -167,6 +167,14 @@ int at_quick_exit(void (*)(void)) __noexcept; _Noreturn void quick_exit(int) /* __noexcept -- not ready ABI issues? */; #endif /* __ISO_C_VISIBLE >= 2011 */ + +/* + * C23 extensions + */ +#if __ISO_C_VISIBLE >= 2023 +size_t memalignment(const void *) __pure2; +#endif /* __ISO_C_VISIBLE >= 2023 */ + /* * Extensions made by POSIX relative to C. */ |