MFC r326276:

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified 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.

No functional change intended.

MFC r309364 r309367 r309624

locale: fix buffer management

Also, handle signed and unsigned chars, and more gracefully handle
invalid input.

locale: enable more warnings; fix them

Do not set WARNS, so it gets the current default of 6.
Fix the warnings by sprinkling static, const, or strdup.
Make some constant data tables const. Fix whitespace.

Sponsored by: Dell EMC

MFC r308824

locale: fix display of "grouping" and "mon_grouping" values

The "grouping" and "mon_grouping" values are arrays of one-byte
integers, not arrays of ASCII characters. Display them in a format
similar to GNU and MacOS.

Sponsored by: Dell EMC

MFC r308808, r308809: Lookup locale when print all keywords as well.

MFC r303541, r303542, r303543, r303545, r303546, r303547, r304225, r304226, r304605, r304676, r305212, r305863:

r303541:
Use nitems() from sys/param.h.

Sponsored by: gandi.net (BSD Day Taiwan)
MFC after: 2 weeks.

r303542:
Use nitems() from sys/param.h.

MFC after: 2 weeks.
Sponsored by: gandi.net (BSD Day Taiwan)

r303543:
Use nitems() from sys/param.h.

MFC after: 2 weeks.
Sponsored by: gandi.net (BSD Day Taiwan)

r303545:
Use nitems() from sys/param.h.

MFC after: 2 weeks.
Sponsored by: gandi.net (BSD Day Taiwan)

r303546:
Use nitems() from sys/param.h.

MFC after: 2 weeks.
Sponsored by: gandi.net (BSD Day Taiwan)

r303547:
Use nitems() from sys/param.h.

MFC after: 2 weeks.
Sponsored by: gandi.net (BSD Day Taiwan)

r304225:
Use nitems() from sys/param.h.

MFC after: 2 weeks.

r304226:
Use nitems() from sys/param.h.

MFC after: 2 weeks.

r304605:
Fix calloc(3) argument order.

Reviewed by: trasz
MFC after: 4 weeks.
Differential Revision: https://reviews.freebsd.org/D7532

r304676:
Fix calloc(3) argument order.

MFC after: 4 weeks.

r305212:
- Invert calloc(3) argument order.

MFC after: 4 weeks

r305863:
Invert calloc(3) argument order.

Reviewed by: ed.
MFC after: 4 weeks.
Differential Revision: https://reviews.freebsd.org/D7902

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

Use the nitems() macro

Fix a ton of speelling errors

arc lint is helpful

Reviewed By: allanjude, wblock, #manpages, chris@bsdjunk.com
Differential Revision: https://reviews.freebsd.org/D3337

Correctly handle keywords without options.

Reported by: swills@
MFC after: 14 days

More style(9) tabs vs. spaces:
- tabs after #define
- Not in comments.

MFC after: 2 weeks

Replace spaces by tabs where appropriate.

Reminded by: jh@

Make parameters to -c and -k options optional. If no parameters are
supplied, print information for all keywords.

Improve output of -c option, in particular in conjunction with -k
option.

MFC after: 14 days

Add the comment "(FreeBSD only)" to the altmonth_x keywords

MFC after: 1 week

Backout changes for c_fmt, x_fmt and X_fmt, they were coming from
the wrong patches. Apologies.

Modified locale(1) to be able to show the altmon_X fields and the [cxX]_fmt's.
Also modify the "-k list" option to display only fields with a certain prefix.

MFC after: 1 week

Remove la_LN.* from the list of bogus locales. They're incomplete, but
still potentially useful.

Exclude bogus la_LN.* and UTF-8 locales from the output of locale -a
to discourage people from using them.

Back out LANG printing changes. POSIX is unclear in this place, but
other systems do that in the old way.

Fix printout case when LANG is overwritten by LC_ALL

Userland signed char fixes for PPC build. Problems were using a char
return for getopt() and comparing to -1, ditto with fgetc() and EOF,
and using the kg_nice value from <sys/user.h>

Submitted by: Stefan Farfeleder <stefan@fafoe.narf.at>
Reviewed by: obrien, bde (a while back)
Tested lightly on: ppc, i386, make universe

Move scmp() to more appropriate location

Add support of '-m' option to show charmaps (or correctly to say list of
available codesets)

Modify manpages appropriatelly

implement LC_MONETARY's int_* keywords

locale.c:

Use newly added __detect_path_locale() helper to lookup _PathLocale value.
It adds boundary checking for PATH_LOCALE environment variable value and
check for super-user fallback.

Makefile:

Add lib/libc/locale to compiler's include path (for setlocale.h)

Catch up with _PATH_LOCALE move from rune.h to paths.h

Add FreeBSD specific keyword 'list' implementation. 'locale -k list' can
be used to retrieve list of all available keywords now.

Fix few typos and remove two unneeded checks

Noticed by: ache

Fix most warnings, sort prototypes, kill spaces at EOLs

Complete rewrite of locale(1) in order to become POSIX complaint utilitty.

It's possibly not completely complaint with POSIX requirements, but
very close to it now.

Add locale(1). I have used it for while as useful debugging tool
for locale related things. So, I think it could be useful for
others. It's not yet implement (or implement in different manner)
all POSIX things, but I think it's good enough for start.

POSIX conformance related updates and manpage to follow relatively soon.