libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Keep those.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D42385

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

libc: drop "All rights reserved" from Foundation copyrights

This has already been done for most files that have the Foundation as
the only listed copyright holder. Do it now for files that list
multiple copyright holders, but have the Foundation copyright in its own
section.

Sponsored by: The FreeBSD Foundation

lnumeric.c: replace some space*8 by tabs

Reported by: brooks
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

__numeric_load(): check for calloc() failure

Noted and reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D34140

libc/locale/lnumeric.c: minor style

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D34140

libc/locale: Fix races between localeconv(3) and setlocale(3)

Each locale embeds a lazily initialized lconv which is populated by
localeconv(3) and localeconv_l(3). When setlocale(3) updates the global
locale, the lconv needs to be (lazily) reinitialized. To signal this,
we set flag variables in the locale structure. There are two problems:

- The flags are set before the locale is fully updated, so a concurrent
localeconv() call can observe partially initialized locale data.
- No barriers ensure that localeconv() observes a fully initialized
locale if a flag is set.

So, move the flag update appropriately, and use acq/rel barriers to
provide some synchronization. Note that this is inadequate in the face
of multiple concurrent calls to setlocale(3), but this is not expected
to work regardless.

Thanks to Henry Hu <henry.hu.sh@gmail.com> for providing a test case
demonstrating the race.

PR: 258360
MFC after: 3 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D31899

libc: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Implement xlocale APIs from Darwin, mainly for use by libc++. This adds a
load of _l suffixed versions of various standard library functions that use
the global locale, making them take an explicit locale parameter. Also
adds support for per-thread locales. This work was funded by the FreeBSD
Foundation.

Please test any code you have that uses the C standard locale functions!

Reviewed by: das (gdtoa changes)
Approved by: dim (mentor)

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

. style(9)
. fix/add comments (to cover changes done thru last 20 months)
. extend monetary testcase to cover int_* values

Fixes to locale code to properly use indirect pointers in order to prevent
memory leaks (fixes bugs earlier purported to be fixed).
Submitted by: Ed Moy <emoy@apple.com>
Obtained from: Apple Computer, Inc.
MFC after: 2 weeks

decimal_point can't be "" according to C99, so set it to standard "."
in that case.

Rewrite locale loading procedures, so any load failure will not affect
currently cached data. It allows a number of nice things, like: removing
fallback code from single locale loading, remove memory leak when LC_CTYPE
data loaded again and again, efficient cache use, not only for
setlocale(locale1); setlocale(locale1), but for setlocale(locale1);
setlocale("C"); setlocale(locale1) too (i.e. data file loaded only once).

Style fixes in preparation of code rewritting

Fix the style of the SCM ID's.
I believe have made all of libc .c's as consistent as possible.

* Add my e-mail to copyrights
* style(9)'ify

catch up to __part_load_locale() interface change

Make comparsions more clear (per style(9))

Don't try to convert grouping strings in case if C or POSIX locale
was explicitly specified.

Submitted by: ache

. Fix semantics of grouping (LC_MONETARY::mon_grouping,
LC_NUMERIC::grouping) values.
. Always set __XXX_changed flags then loading numeric & monetary locale
categories to allow localeconv() to use C locale also.

According to Garrett, POSIX widely use -1 to indicate CHAR_MAX, so back out
all my "-1" -> "something" fixes and replace -1 with CHAR_MAX directly in
strtol() in cnv()

Use __XSTRING(CHAR_MAX) instead of "127" and strtol() base 0 to parse it (0x7f)

Correct myself a bit: situation is broken not for _all_ numeric LC_MONETARY,
LC_NUMERIC fields, but only for *grouping fields - other fields are converted
to a chars in localeconv(), so final change is:

"-1" -> "127"

127 here is because CHAR_MAX supposed, which is _positive_ (SUSv2 requirement),
not negative as 255. It is still a bit of hack. To find real CHAR_MAX will be
better to sprintf() it once somewhere in static buffer. *grouping parsing
still broken and missing and needs to be implemented.

NOTE: according to SUSV2 and other implementations, numeric elements in
LC_MONETARY, LC_NUMERIC are byte-arrays, not ASCII strings!

Fix "C" locale, change "-1" to {CHAR_MAX, '\0'} according to standards.

This is only partial fix - locale loading procedure remains broken as before
and load too big values for all locales. All numeric strings there should be
converted with something like atoi() and placed into bytes. Maybe I do it
later, if someone will not fix it faster.

Make FreeBSD locale support complete: add support for rest locale categories
LC_MONETARY, LC_NUMERIC and LC_MESSAGES. Remove stub functions since they
don't need anymore.

Reviewed by: silence on -i18n