Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Add restrict qualifiers to the parameters to strlcpy() and strlcat().
The annotation mainly just serves as a hint that they're not intended
for use with overlapping strings.

o ANSIfy.
o Use ISC style copyright as did by the author.

Obtained from: OpenBSD

Enable building with LIBC_SCCS defined.

Bug submitted by: Andrea Campi <andrea+freebsd_current@webcom.it>

Back out the `hiding' of strlcpy and strlcat. Several people
vocally objected to this safety belt.

`Hide' strlcpy and strlcat (using the namespace.h / __weak_reference
technique) so that we don't wind up calling into an application's
version if the application defines them.

Inspired by: qpopper's interfering and buggy version of strlcpy

Remove 'register' keyword.

rcsid[]->__FBSDID

Sync to OpenBSD (update comment and minor style change).

Obtained from: OpenBSD
MFC after: 1 week

Make the rcsid and FreeBSD IDs more sane in the wcs* and wmem* files.
Do the same for the non-wcs*/wmem* files while I'm here.

- Reverse the order of two loop invariant to ensure strlcat() does not
attempt to read memory when siz is 0
- Clarify comments referring to strlcat() usage

PR: 24278, 24295
Submitted by: Tony Finch <dot@dotat.at>
Richard Kettlewell <rjk@greenend.org.uk>
Reviewed by: -audit

Use the latest version of these files from OpenBSD.

1) Safty change from casper dik was added to OpenBSD's sources since I
grabbed them. milltert@openbsd.org
2) Split up strlcpy to improve efficiency of the common case.
milltert@openbsd.org
3) Cleanup of cross references for man page. {alex,aaron}@openbsd.org

Pointed out by: deraadt@openbsd.org

Import strl{cat,cpy} from OpenBSD.

Obtained from: OpenBSD