memccpy, strdup and strndup are in C23

7.26.2.2 memccpy
7.26.2.6 strdup
7.26.2.7 strndup

memset_explicit(3): Add C23 alias for explicit_memset.

PR standards/58607: C23: <string.h> memset_explicit

string.h: Fix various symbol visibility issues.

1. Order declarations according to POSIX 2024 to make this easier to
review side-by-side with the spec.
2. Fix visibility of memccpy: XSI-only, not

string.h: Fix various symbol visibility issues.

1. Order declarations according to POSIX 2024 to make this easier to
review side-by-side with the spec.
2. Fix visibility of memccpy: XSI-only, not POSIX in general; require
_XOPEN_SOURCE, not just _POSIX_C_SOURCE.
3. Omit redundant _XOPEN_SOURCE test around stpcpy/stpncpy.
4. Hide strdup in POSIX 2001. Not POSIX (without XSI) until 2008.
5. Hide strerror_r until POSIX 2001. Can't find evidence of it in
any earlier POSIX or X/Open. (Not 100% sure on this one, maybe
someone can double-check my research.)
6. Add restrict to strlcat/strlcpy.
7. Omit redundant _XOPEN_SOURCE test around strndup and strnlen.
8. Hide strtok_r until POSIX 2001. Can't find evidence of it in
any earlier POSIX or X/Open. (Not 100% sure on this one, maybe
someone can double-check my research.)

Carry the restrict qualifiers on strlcat/strlcpy to libkern too.

Main reference:
https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/string.h.html

PR standards/58804: string.h: wrong visibility for memccpy

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libc: Expose some newly-standard C functions in POSIX.1-2024 mode

Add companion mempcpy to wmempcpy, bump.

fix various typos in compatibility, mainly in comments.

Mark in string.h: memccpy(3) and strdup(3) as _POSIX_C_SOURCE >= 2001

add strchrnull

strndup() is part of XSI from The Open Group Base Specification Issue 7 and had
a similar history of stpcpy(), stpncpy() and strnlen().
Make it visible under XOPEN_SOURCE>=700 too (not just _NETBSD_S

strndup() is part of XSI from The Open Group Base Specification Issue 7 and had
a similar history of stpcpy(), stpncpy() and strnlen().
Make it visible under XOPEN_SOURCE>=700 too (not just _NETBSD_SOURCE).

ok dholland@

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add strnstr from FreeBSD

Publish explicit_memset and consttime_memequal in userland libc.

Remove the double-underscore from the userland versions, and do the
weak alias dance instead, now that these are public parts of libc

Publish explicit_memset and consttime_memequal in userland libc.

Remove the double-underscore from the userland versions, and do the
weak alias dance instead, now that these are public parts of libc.

As discussed on tech-userlevel:

https://mail-index.netbsd.org/tech-userlevel/2013/06/24/msg007843.html
(option 3)

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Make explicit_memset match memset's return value.

Remove outdated comment.

Add strerror_l.

Replace consttime_bcmp/explicit_bzero by consttime_memequal/explicit_memset.

consttime_memequal is the same as the old consttime_bcmp.
explicit_memset is to memset as explicit_bzero was to bcmp.

Pa

Replace consttime_bcmp/explicit_bzero by consttime_memequal/explicit_memset.

consttime_memequal is the same as the old consttime_bcmp.
explicit_memset is to memset as explicit_bzero was to bcmp.

Passes amd64 release and i386/ALL, but I'm sure I missed some spots,
so please let me know.

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__BEGIN_DECLS/__END_DECLS

Add dummy strcoll_l and strxfrm_l.

Add "consttime_bcmp" and "explicit_bzero" functions for both kernel
abd userland, as proposed on tech-security, with explicit_bzero using
a volatile function pointer as suggested by Alan Barrett.
Bot

Add "consttime_bcmp" and "explicit_bzero" functions for both kernel
abd userland, as proposed on tech-security, with explicit_bzero using
a volatile function pointer as suggested by Alan Barrett.
Both do what the name says. For userland, both are prefixed by "__"
to keep them out of the user namespace.
Change some memset/memcmp uses to the new functions where it makes
sense -- these are just some examples, more to come.

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Do not wrap other header files with extern "C".

Declare strsignal(3) in <string.h>, per POSIX-2008, and adjust
documentation accordingly.

Fixes PR standards/41325 from Perry E. Metzger.

note that we have strsignal but it is in the wrong include file.

Add prototypes for stpcpy, stpncpy, strnlen, added in the latest POSIX.

Implementations in libc to follow.

For POSIX compliance, we are still missing:

strcoll_l
strerror_l
strsignal
strxfrm_l

add memrchr

kill _NETBSD_TOOLS.

Introduce _NETBSD_TOOLS for symbols the are needed in tools build