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d08296c7ab0d7bb259bf7b8cdf9ffb819c1929ab
freebsd/lib/libc/string
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Faraz Vahedi d08296c7ab libc: Implement qualifier-preserving standard library functions 
Several standard library functions are specified to return an unqualified
pointer while accepting a pointer to a potentially const-qualified object.
N3020 addresses this behaviour, discarding qualifiers due to incompatible
pointer types, by introducing qualifier-preserving macros for the affected
set of standard library functions.

Add `__qualsel()` helper to `<sys/cdefs.h>`, implemented using the generic
selection, and define qualifier-preserving macros for that set of functions
in `<string.h>`, `<wchar.h>`, and `<stdlib.h>`.

Macros are gated on `_STDC_VERSION__ >= 202311L && !__cplusplus`, therefore
there is no behavioural change for earlier C modes or C++ translation units.
The kernel is likewise unaffected, as it does not include userland headers.

As function-like macros, they are transparent except at a call site where
the address-of operator is applied, the macro is suppressed via `#undef`,
or the identifier appears in parenthesised form; all of which cause the
underlying function designator to be used instead.

Reviewed by:	fuz
Approved by:	fuz (mentor)
MFC after:	1 month
Pull Request:	https://github.com/freebsd/freebsd-src/pull/2288
2026-08-13 20:08:49 +03:30
..
bcmp.3
bcmp(3): update manpage to following the Posix Standard
2026-02-02 10:28:26 +03:30
bcmp.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
bcopy.3
mem*.3: stop refering to strings
2026-06-21 17:48:49 +01:00
bcopy.c
Prepare the system for _FORTIFY_SOURCE
2024-05-13 00:23:50 -05:00
bstring.3
libc: Implement qualifier-preserving standard library functions
2026-08-13 20:08:49 +03:30
bzero.3
mem*.3: stop refering to strings
2026-06-21 17:48:49 +01:00
bzero.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
ffs.3
man/man3: add cross references to stdbit(3)
2025-11-30 20:21:52 +01:00
ffs.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
ffsl.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
ffsll.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
fls.c
libc/fls*.c: use *_WIDTH macros over CHAR_BIT * sizeof(type)
2026-04-23 00:58:54 +02:00
flsl.c
libc/fls*.c: use *_WIDTH macros over CHAR_BIT * sizeof(type)
2026-04-23 00:58:54 +02:00
flsll.c
libc/fls*.c: use *_WIDTH macros over CHAR_BIT * sizeof(type)
2026-04-23 00:58:54 +02:00
index.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
Makefile.inc
libc/string: add strdupa(3) and strndupa(3)
2025-12-09 00:34:57 +02:00
memccpy.3
mem*.3: stop refering to strings
2026-06-21 17:48:49 +01:00
memccpy.c
lib/libc/string: document restrict qualification of memccpy() arguments
2023-12-25 14:59:50 +01:00
memchr.3
libc: Implement qualifier-preserving standard library functions
2026-08-13 20:08:49 +03:30
memchr.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
memcmp.3
memcmp.3: Clarify return value
2024-11-20 12:15:11 -05:00
memcmp.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
memcpy.3
mem*.3: stop refering to strings
2026-06-21 17:48:49 +01:00
memcpy.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
memmem.3
libc: Implement qualifier-preserving standard library functions
2026-08-13 20:08:49 +03:30
memmem.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
memmove.3
mem*.3: stop refering to strings
2026-06-21 17:48:49 +01:00
memmove.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
mempcpy.c
include: ssp: don't shadow the mempcpy builtin
2024-07-16 00:12:28 -05:00
memrchr.c
…
memset_explicit.c
lib/libc/string: apply SSP hardening and tests to memset_explicit
2024-11-14 23:10:00 +01:00
memset_s.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
memset.3
mem*.3: stop refering to strings
2026-06-21 17:48:49 +01:00
memset.c
Prepare the system for _FORTIFY_SOURCE
2024-05-13 00:23:50 -05:00
stpcpy.c
Prepare the system for _FORTIFY_SOURCE
2024-05-13 00:23:50 -05:00
stpncpy.c
Prepare the system for _FORTIFY_SOURCE
2024-05-13 00:23:50 -05:00
strcasecmp.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strcasecmp.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strcasestr.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
strcat.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strcat.c
Prepare the system for _FORTIFY_SOURCE
2024-05-13 00:23:50 -05:00
strchr.3
libc: Implement qualifier-preserving standard library functions
2026-08-13 20:08:49 +03:30
strchr.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
strchrnul.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
strcmp.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strcmp.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strcoll.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strcoll.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
strcpy.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strcpy.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strcspn.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
strdup.3
libc/string: add strdupa(3) and strndupa(3)
2025-12-09 00:34:57 +02:00
strdup.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strerror.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strerror.c
include: ssp: round out fortification of current set of headers
2024-07-13 00:16:24 -05:00
string.3
libc: Implement qualifier-preserving standard library functions
2026-08-13 20:08:49 +03:30
strlcat.c
include: ssp: round out fortification of current set of headers
2024-07-13 00:16:24 -05:00
strlcpy.3
strlcpy/strlcat: Remove references to snprintf
2023-10-27 10:13:50 -06:00
strlcpy.c
include: ssp: round out fortification of current set of headers
2024-07-13 00:16:24 -05:00
strlen.3
strnlen(3): add HISTORY
2024-03-15 14:52:47 -07:00
strlen.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
strmode.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strmode.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strncat.c
Prepare the system for _FORTIFY_SOURCE
2024-05-13 00:23:50 -05:00
strncmp.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strncpy.c
include: ssp: round out fortification of current set of headers
2024-07-13 00:16:24 -05:00
strndup.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
strnlen.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
strnstr.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strpbrk.3
libc: Implement qualifier-preserving standard library functions
2026-08-13 20:08:49 +03:30
strpbrk.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strrchr.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strsep.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strsep.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strsignal.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strspn.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strspn.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
strstr.3
libc: Implement qualifier-preserving standard library functions
2026-08-13 20:08:49 +03:30
strstr.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
strtok.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strtok.c
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strverscmp.3
libc: fix history for strverscmp(3) and versionsort(3)
2023-08-31 14:52:31 +03:00
strverscmp.c
…
strxfrm.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
strxfrm.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
swab.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
swab.c
swab: Correctly treat the data as misaligned
2026-01-14 12:10:33 -05:00
Symbol.map
lib/libc/string: add memset_explicit() for compliance with C23
2024-11-14 23:10:00 +01:00
timingsafe_bcmp.3
timingsafe_bcmp(3) was MFC'ed to 11.1
2024-01-05 20:54:13 -08:00
timingsafe_bcmp.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
timingsafe_memcmp.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
wcpcpy.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00
wcpncpy.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00
wcscasecmp.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
wcscat.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00
wcschr.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
wcscmp.c
sccs: Manual changes
2023-11-26 22:23:58 -07:00
wcscoll.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
wcscoll.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
wcscpy.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00
wcscspn.c
Remove $FreeBSD$: one-line .c pattern
2023-08-16 11:54:42 -06:00
wcsdup.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
wcslcat.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00
wcslcpy.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00
wcslen.c
Remove $FreeBSD$: one-line .c pattern
2023-08-16 11:54:42 -06:00
wcsncasecmp.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
wcsncat.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00
wcsncmp.c
sccs: Manual changes
2023-11-26 22:23:58 -07:00
wcsncpy.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00
wcsnlen.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
wcspbrk.c
Remove $FreeBSD$: one-line .c pattern
2023-08-16 11:54:42 -06:00
wcsrchr.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
wcsspn.c
Remove $FreeBSD$: one-line .c pattern
2023-08-16 11:54:42 -06:00
wcsstr.c
lib: Automated cleanup of cdefs and other formatting
2023-11-26 22:23:59 -07:00
wcstok.3
Remove $FreeBSD$: two-line nroff pattern
2023-08-16 11:55:10 -06:00
wcstok.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
wcswidth.3
Remove $FreeBSD$: two-line nroff pattern
2023-08-16 11:55:10 -06:00
wcswidth.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
wcsxfrm.3
lib: Remove ancient SCCS tags.
2023-11-26 22:23:28 -07:00
wcsxfrm.c
libc: Purge unneeded cdefs.h
2023-11-01 16:44:30 -06:00
wmemchr.3
libc: Implement qualifier-preserving standard library functions
2026-08-13 20:08:49 +03:30
wmemchr.c
Remove $FreeBSD$: one-line .c pattern
2023-08-16 11:54:42 -06:00
wmemcmp.c
Remove $FreeBSD$: one-line .c pattern
2023-08-16 11:54:42 -06:00
wmemcpy.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00
wmemmove.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00
wmempcpy.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00
wmemset.c
include: ssp: fortify <wchar.h>
2024-07-13 00:16:25 -05:00