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Robert Clausecker 6c57e368eb 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), [email protected]
Approved by:	markj (mentor)
MFC after:	1 month
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D53673
2025-11-12 13:23:09 +01:00
..
arm
arm64: lib32: Don't try to install removed <machine/runq.h>
2025-06-18 12:00:08 -04:00
arpa
Remove residual blank line at start of Makefile
2024-07-15 16:43:39 -06:00
gssapi
Remove residual blank line at start of Makefile
2024-07-15 16:43:39 -06:00
i386
…
protocols
Remove residual blank line at start of Makefile
2024-07-15 16:43:39 -06:00
rpc
Revert "Remove Secure RPC DES authentication"
2025-08-15 17:59:18 +01:00
rpcsvc
Remove residual blank line at start of Makefile
2024-07-15 16:43:39 -06:00
ssp
ssp: Protect sig2str with proper visibility markers
2025-06-11 21:19:05 -06:00
xlocale
Remove residual blank line at start of Makefile
2024-07-15 16:43:39 -06:00
_ctype.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
a.out.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
ar.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
assert.h
include: add a userland version of __assert_unreachable
2025-01-12 18:41:37 -06:00
bitstring.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
byteswap.h
…
complex.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
cpio.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
ctype.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
db.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
dirent.h
Revert "libc: Remove readdir_r(3)"
2025-09-11 17:12:22 +02:00
dlfcn.h
Don't rely on sys/_types.h including sys/cdefs.h
2025-06-11 17:39:01 +01:00
elf-hints.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
elf.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
endian.h
endian.h: Update comments now that POSIX Issue 8 is POSIX.1-2024
2024-12-30 13:38:39 -07:00
err.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
exterr.h
Provide user interface to retrieve reported extended errors
2025-05-31 22:52:42 +03:00
fmtmsg.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
fnmatch.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
fstab.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
fts.h
fts: Add FTS_COMFOLLOWDIR and FTS_NOSTAT_TYPE.
2025-05-08 16:29:15 +02:00
ftw.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
getopt.h
Remove $FreeBSD$: one-line .c comment pattern
2023-08-16 11:54:29 -06:00
glob.h
glob.h: Limit glob_b prototype visibility
2025-06-03 22:59:28 +02:00
grp.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
gssapi.h
Remove $FreeBSD$: one-line .c comment pattern
2023-08-16 11:54:29 -06:00
hesiod.h
Remove $FreeBSD$: one-line .c comment pattern
2023-08-16 11:54:29 -06:00
iconv.h
include: Automated cleanup of cdefs and other formatting
2023-11-26 22:23:59 -07:00
ieeefp.h
Remove $FreeBSD$: one-line .c comment pattern
2023-08-16 11:54:29 -06:00
ifaddrs.h
Remove $FreeBSD$: one-line .c comment pattern
2023-08-16 11:54:29 -06:00
inttypes.h
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2023-08-16 11:54:16 -06:00
iso646.h
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2023-08-16 11:54:16 -06:00
kenv.h
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2023-08-16 11:54:16 -06:00
langinfo.h
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2023-08-16 11:54:16 -06:00
libgen.h
Remove $FreeBSD$: one-line .c comment pattern
2023-08-16 11:54:29 -06:00
limits.h
Add POSIX NSIG_MAX & _SC_NSIG
2025-06-11 17:16:20 -06:00
link.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
locale.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
Makefile
libbsm: Rename package to audit-lib
2025-09-30 09:14:58 +01:00
Makefile.depend
Update Makefile.depend files
2024-10-14 10:26:17 -07:00
Makefile.inc
pkgbase: Move headers and libs out of runtime and utilities
2023-09-12 13:22:21 +01:00
malloc_np.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
malloc.h
Remove $FreeBSD$: one-line .h pattern
2023-08-16 11:54:23 -06:00
memory.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
mk-osreldate.sh
Remove $FreeBSD$: one-line sh pattern
2023-08-16 11:55:03 -06:00
monetary.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
mpool.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
mqueue.h
include: Automated cleanup of cdefs and other formatting
2023-11-26 22:23:59 -07:00
ndbm.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
netconfig.h
Remove $FreeBSD$: one-line .c comment pattern
2023-08-16 11:54:29 -06:00
netdb.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
nl_types.h
Revert "nl_types.h: explicitly include cdefs.h"
2024-01-24 22:50:49 -05:00
nlist.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
nss.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
nsswitch.h
Remove $FreeBSD$: one-line .c comment pattern
2023-08-16 11:54:29 -06:00
ossfuzz.h
vendor/bc: upgrade to version 7.0.0
2024-08-26 18:27:29 +02:00
paths.h
include/paths.h: add _PATH_NOSHUTDOWN
2025-05-05 19:04:22 +03:00
printf.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
proc_service.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
pthread_np.h
libthr: add stable user interface for sigfastblock(2)
2025-05-19 09:07:43 +03:00
pthread.h
libthr: add pthread_sigqueue(3)
2024-04-23 19:51:22 +03:00
pwd.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
ranlib.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
readpassphrase.h
Remove $FreeBSD$: one-line .c comment pattern
2023-08-16 11:54:29 -06:00
regex.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
res_update.h
Remove $FreeBSD$: one-line .h pattern
2023-08-16 11:54:23 -06:00
resolv.h
libc/resolv: get rid of MD5
2025-10-04 10:50:02 +02:00
runetype.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
sched.h
include: Automated cleanup of cdefs and other formatting
2023-11-26 22:23:59 -07:00
search.h
Remove $FreeBSD$: one-line .h pattern
2023-08-16 11:54:23 -06:00
semaphore.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
setjmp.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
signal.h
include: ssp: fortify <signal.h>
2025-06-11 17:16:22 -06:00
spawn.h
posix_spawn(3): add POSIX_SPAWN_DISABLE_ASLR_NP
2024-03-04 03:00:38 +02:00
stab.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
stdalign.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
stdbool.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
stdckdint.h
include/stdckdint.h: make the header compatible with C++
2025-10-18 00:48:30 +03:00
stddef.h
stddef.h: don't include sys/cdefs.h
2025-06-11 17:39:02 +01:00
stdio.h
sys/_stdarg.h: drop cdefs.h and _types.h polution
2025-06-11 17:39:02 +01:00
stdlib.h
lib/libc: implement C23 memalignment()
2025-11-12 13:23:09 +01:00
stdnoreturn.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
string.h
Revert Make newly POSIX functions visible
2025-03-20 03:41:27 -04:00
stringlist.h
include: Automated cleanup of cdefs and other formatting
2023-11-26 22:23:59 -07:00
strings.h
include: ssp: round out fortification of current set of headers
2024-07-13 00:16:24 -05:00
sysexits.h
sysexits: Tidy deprecated header and manual
2024-05-09 20:50:48 -06:00
tar.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
termios.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
tgmath.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
time.h
tzcode: Expose and document offtime() and offtime_r()
2025-09-23 21:38:49 +02:00
timeconv.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
timers.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
ttyent.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
uchar.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
ulimit.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
unistd.h
Add POSIX NSIG_MAX & _SC_NSIG
2025-06-11 17:16:20 -06:00
utime.h
include: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
utmpx.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
uuid.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
varargs.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
wchar.h
sys/_stdarg.h: drop cdefs.h and _types.h polution
2025-06-11 17:39:02 +01:00
wctype.h
Remove $FreeBSD$: one-line .h pattern
2023-08-16 11:54:23 -06:00
wordexp.h
Remove $FreeBSD$: two-line .h pattern
2023-08-16 11:54:16 -06:00
xlocale.h
Remove "All Rights Reserved" from FreeBSD Foundation copyrights
2024-07-30 12:16:36 -04:00