MFC r306852

Incorporate a change from OpenBSD by millert@OpenBSD.org

Don't warn about valid time zone abbreviations. POSIX
through 2000 says that an abbreviation cannot start with ':', and
cannot contain ',', '-', '+', NUL, or a digit. POSIX from 2001
on changes this rule to say that an abbreviation can contain only
'-', '+', and alphanumeric characters from the portable character
set in the current locale. To be portable to both sets of rules,
an abbreviation must therefore use only ASCII letters." Adapted
from tzcode2015f.

This is needed to be able to update tzdata to a newer version

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Sync code with tzcode2010m

asctime.c:
* Set errno to EINVAL and return "??? ??? ?? ??:??:?? ????\n" if
asctime_r is called with a NULL struct tm pointer. (Note that
asctime_r is called by ctime_r and asctime; asctime is called by
ctime.)

localtime.c:
* Set errno to EINVAL and return WRONG if time1 is called with a
NULL struct tm pointer; avoid dereference if a NULL struct tm
pointer is passed to timelocal, timegm, or timeoff. (Note that
time1 is called by mktime, timegm, and timeoff; mktime is called
by timelocal.)
* more core-avoidance work
* Change to set timezone and altzone based on time types with
greatest transition times (for the benefit of Asia/Seoul).

zic.8:
* Warning about case-sensitivity of names, but not of abbrevations

zic.c:
* Conditionally output extra types with most-recently-use offsets
last (for use by systems with pre-2011 versions of localtime.c,
helping to ensure that globals "altzone and "timezone" get set
correctly).

The code has been running for nearly four weeks on my laptop running
FreeBSD 8.1 without a problem.

MFC after: 1 month

Copy usr.sbin/zic to contrib/tzcode/zic for the proper split of
contributed code and FreeBSD specific code.

MFV of r195794

MFV of tzcode2009k

zic.c:
Do not end a binary file with a POSIX-style time zone string
for locations that end up in permanent DST (thanks to Andreas
Schwab).

MFV of tzcode2009e:

Upgrade of the tzcode from 2004a to 2009e.

Changes are numerous, but include...

- New format of the output of zic, which supports both 32 and 64
bit time_t formats.

- zdump on 64 bit platforms will actually produce some output instead
of doing nothing for a looooooooong time.

- linux_base-fX, with X >= at least 8, will work without problems related
to the local time again.

The original patch, based on the 2008e, has been running for a long
time on both my laptop and desktop machine and have been tested by
other people.

After the installation of this code and the running of zic(8), you
need to run tzsetup(8) again to install the new datafile.

Approved by: wollman@ for usr.sbin/zic
MFC after: 1 month

zic(8) should exit the loop when the end of the string is reached due
to the call to error(). The problem found by doing fuzz testing.

MFC after: 3 days

Make the -m option actually work.

Merge changes from the tzcode2004a import.

Check whether setmode(3) fails and deallocate its return value after
calling getmode(3).

Approved by: wollman
MFC after: 1 week

Back out WARNS cleanup: this is apparently vendor code, even though
most of the files aren't on the vendor branch.

Submitted by: wollman

Constify, add some prototypes, and set WARNS=2.

Submitted by: Mike Barcroft <mike@q9media.com>

-Wall cleaning

$Id$ -> $FreeBSD$

Fix mismerged error message.

Submitted by: charnier

I don't know how this happened since I know I compiled this on my machine.
Fix braino oflag -> uflag (or perhaps I should have gone the other way).

Merge changes from vendor branch (tzcode1999a), plus the following additional
changes:

- Finish migrating zic to its own private.h.
- Fix zic.8 so that it really is written in -mdoc.
- Add four new flags to zic (&document):
-D don't create directories
-u change ownership of newly-created files to user
-g change ownership of newly-created files to group
-m change mode of newly-created files to modespec
These, once proven, can be used to clean up the installation.

Obtained from: ftp://elsie.nci.nih.gov/pub/tzcode1999a.tar.gz (partially)

Use err(3). Rewrote man page using mdoc format.

compare return value from getopt against -1 rather than EOF, per the final
posix standard on the topic.

Remove old output file, if any, before creating the output file, in
case the file is a stale link.

Reviewed by: wollman

Merge from vendor branch. We are now completely up-to-date with
respect to the ADO timezone code.

Update timezone compiler and dumper to understand the new EC rules.

FreeBSD port of timezone code.

This commit was generated by cvs2svn to compensate for changes in r2702,
which included commits to RCS files with non-trunk default branches.

The latest and greatest timezone code from Arthur David Olson, part 1.
This import comprises the `zic' and `zdump' programs.

Obtained from: Arthur David Olson, ftp://elsie.nci.nih.gov/pub/tzcode94g