Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

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

libc/locale: Remove a wrong comma.

This only had some effect when debugging.

Obtained from: DragonflyBSD
MFC after: 3 days

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)

. 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

Cosmetic: use LCMONETARY_SIZE_{FULL,MIN} defines like in other places

Add support for the 6 new C99 struct lconv members dealing with formatting
international monetary values: int_p_cs_precedes, int_n_cs_precedes,
int_p_sep_by_space, int_n_sep_by_space, int_p_sign_posn, int_n_sign_posn.
This should not break existing binaries or LC_MONETARY data files.

Reviewed by: ache
MFC after: 1 month

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.

Do not try to convert to char already converted C monetary locale members.
Do this conversion on locale load stage instead.

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

Change mon_decimal_point from "." to "" (N/A>) as it is specified by POSIX for
POSIX locale.

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