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[Perl/perl5] 26d767: XXX craig Unixish.h, doshish.h: Reorderterminatio...

From:
Karl Williamson via perl5-changes
Date:
March 31, 2021 14:09
Subject:
[Perl/perl5] 26d767: XXX craig Unixish.h, doshish.h: Reorderterminatio...
Message ID:
Perl/perl5/push/refs/heads/smoke-me/khw-locale/4ca8ee-4d21b2@github.com
  Branch: refs/heads/smoke-me/khw-locale
  Home:   https://github.com/Perl/perl5
  Commit: 26d767622574f88e2ec1078e05628872ff39a2c6
      https://github.com/Perl/perl5/commit/26d767622574f88e2ec1078e05628872ff39a2c6
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M dosish.h
    M unixish.h

  Log Message:
  -----------
  XXX craig Unixish.h, doshish.h: Reorder terminations; simplify

The IO and memory terminations need to be after other things.  Add a
comment so that future maintainers won't make the mistakes I did.

Also refactor to that amiga os doesn't have a separate list to get out
of sync

I suspect that the amiga termination should be moved to earlier in
the sequence, but absent any evidence; I'm leaving it unchanged.


  Commit: 4890895187c457b34b63529ba7a136ac01f184b8
      https://github.com/Perl/perl5/commit/4890895187c457b34b63529ba7a136ac01f184b8
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Win32: Don't check folds validity

This code will check, when warnings are on, that the libc functions
return valid values.  But Windows platforms will always fail because
they have multiple divergences from the Posix standard.  The macros that
implement the case changing/folding in handy.h take extra steps to bring
Windows code more into alignment with Posix.  Those are too complicated
to easily duplicate the logic here.  The result of these checks is
looked at by our test suite, which has long, without anyone noticing,
skipped portions on Windows, even though handy.h should correct for
this.  So simply, don't do the checking under Windows, and find out what
handy.h has failed to fully correct for.


  Commit: ea5b575f2c82ba6b3ac7bef6fcbb8bc2ff812877
      https://github.com/Perl/perl5/commit/ea5b575f2c82ba6b3ac7bef6fcbb8bc2ff812877
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M lib/locale_threads.t

  Log Message:
  -----------
  XXX locale_threads


  Commit: cb20b7d1f2df4918516ef11ba1e4c658d024e075
      https://github.com/Perl/perl5/commit/cb20b7d1f2df4918516ef11ba1e4c658d024e075
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c
    M perl.h

  Log Message:
  -----------
  DEBUG_L now also looks at environment variable

Because locale initialization happens before command line processing,
one can't pass a -DL argument to enable debugging of locale
initialization.  Instead, an environment variable is read then, and is
used to enable debugging or not.  In the past, code specifically had to
test for this being set.  This commit changes that so that debugging can
automatically be enabled without having to write special code.  Future
commits will strip out those special checks.


  Commit: a0e9b61cafd40ff13c257d5b28abcf02fa1a3883
      https://github.com/Perl/perl5/commit/a0e9b61cafd40ff13c257d5b28abcf02fa1a3883
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Replace most #ifdef DEBUGGING lines

THe previous commit enhanced the DEBUG macros so that they contain the
logic that previously had to be done with conditional compilation
statements.  Removing them makes the code easier to read.


  Commit: db8100e805e6580fc189b8c0f7ab3e9563162b00
      https://github.com/Perl/perl5/commit/db8100e805e6580fc189b8c0f7ab3e9563162b00
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h
    M numeric.c
    M regcomp.c
    M regexec.c
    M utfebcdic.h

  Log Message:
  -----------
  Change handy.h macro names to be C standard conformant

C reserves symbols beginning with underscores for its own use.  This
commit moves the underscore so it is trailing, which is legal.  The
symbols changed here are most of the ones in handy.h that have few uses
outside it.


  Commit: 120bdfd50b610c54f40705abc035b076afb7b560
      https://github.com/Perl/perl5/commit/120bdfd50b610c54f40705abc035b076afb7b560
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Remove only 2 calls to an internal macro

Replace isIDFIRST_LC and isWORD_CHAR_LC isIDFIRST_LC  with slightly
faster implementations.


  Commit: cdd4c5ea1260503f3124b655b5fd562818604956
      https://github.com/Perl/perl5/commit/cdd4c5ea1260503f3124b655b5fd562818604956
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Refactor some #ifdef's for commonality

This changes these compilation conditionals so that things in common
between Windows and other platforms are only defined once.

It changes the isIDFIRST_LC and isWORDCHAR_LC definitions for
non-Windows to match that platform superficially, though expanding to
what it previously did to.


  Commit: 32e119b83a75ded3c3256dd8115c6e56186042e0
      https://github.com/Perl/perl5/commit/32e119b83a75ded3c3256dd8115c6e56186042e0
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Add some branch predictions


  Commit: e7dc418bbbe1477c60fc8b7e288fffc189355f17
      https://github.com/Perl/perl5/commit/e7dc418bbbe1477c60fc8b7e288fffc189355f17
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: White-space, comment only


  Commit: a2318db0e79189977844cb1901771fa4aff18285
      https://github.com/Perl/perl5/commit/a2318db0e79189977844cb1901771fa4aff18285
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Don't use char class if no LC_CTYPE

It is possible to compile perl to not pay attention to LC_CTYPE.  This
was testing for no locales at all; whereas the stricter requirement
should be used.


  Commit: 00bd6166184e5637cc3028ca560e10717a321119
      https://github.com/Perl/perl5/commit/00bd6166184e5637cc3028ca560e10717a321119
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M charclass_invlists.h
    M handy.h
    M l1_char_class_tab.h
    M lib/unicore/uni_keywords.pl
    M perl.c
    M perl.h
    M regcomp.c
    M regcomp.h
    M regen/mk_PL_charclass.pl
    M regexec.c
    M sv.c
    M uni_keywords.h
    M utfebcdic.h

  Log Message:
  -----------
  Change handy.h macro names to be C standard conformant

C reserves symbols beginning with underscores for its own use.  This
commit moves the underscore so it is trailing, which is legal.  The
symbols changed here are many of the ones in handy.h that have
significant uses outside it.


  Commit: fdf6128264e04021d7d5d9fd90f409896781dbfd
      https://github.com/Perl/perl5/commit/fdf6128264e04021d7d5d9fd90f409896781dbfd
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Rmv internal macro

LC_CAST_ was my attempt at generality, but I didn't realize that the
POSIX standard specifies the type that this was meant to generalize, so
there isn't any need for it.


  Commit: 566f39f8c6e92be888b3648cfc60d64e76d5498c
      https://github.com/Perl/perl5/commit/566f39f8c6e92be888b3648cfc60d64e76d5498c
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Refactor some internal macros

This changes the parameters etc, in preparation for further changes


  Commit: 0d123c0ea9784ec87f5531d02b8e428bbb4e8710
      https://github.com/Perl/perl5/commit/0d123c0ea9784ec87f5531d02b8e428bbb4e8710
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Rmv unnecessary parameter to internal macros

The cast is required to be U8 by the POSIX standard.  There is no need
to have this added generality.


  Commit: af1d76feb7925f58ecfa79b19818464159130f9a
      https://github.com/Perl/perl5/commit/af1d76feb7925f58ecfa79b19818464159130f9a
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: #define one macro in terms of another

These two macros are equivalent as folding and lowercasing are the same
for this input domain.  Better to say so rather than to replicate the
definitions.


  Commit: cdb92b42767936eaaa845c539dec3007fabe9e6c
      https://github.com/Perl/perl5/commit/cdb92b42767936eaaa845c539dec3007fabe9e6c
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  No locales => don't use isspace(), toLower() etc.

This commit changes what happens on platforms without locale handling to
use our precomputed definitions of what the various character class
definitions and case changing operations are.  Previously, it just
called the libc locale-dependent functions and made sure the result was
ASCII.  I think this is a holdover from before we had the precomputed
definitions


  Commit: bc0858963647358d680b0332aff899105169eb9a
      https://github.com/Perl/perl5/commit/bc0858963647358d680b0332aff899105169eb9a
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Collapse two sets of macros

By redefining a wrapper macro used in one set based on compile-time
info; the other set can be defined in terms of it, and the separate
entries removed.


  Commit: dc321ecbc9484d90b1c797533f4059c3bc6ac7ad
      https://github.com/Perl/perl5/commit/dc321ecbc9484d90b1c797533f4059c3bc6ac7ad
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Move some macro defns around

This is to make the difference listing in future commits smaller.

This change includes some comment changes, and some extra parens around
some subexpressions


  Commit: 14a738a9b07e2441873a2c6b8d30873ef7a1ec37
      https://github.com/Perl/perl5/commit/14a738a9b07e2441873a2c6b8d30873ef7a1ec37
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Collapse some macros

These 3 sets of macros can be collapsed trivially into 3 macros.


  Commit: b3d0a39111c88ad759861861d0ac68aceae23000
      https://github.com/Perl/perl5/commit/b3d0a39111c88ad759861861d0ac68aceae23000
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Add wrapper layer macros for isalnum() ...

This adds a new set of macros, forming a lower layer to what is currently
there to wrap the character classification libc functions, isdigit()
etc, and case changing ones, tolower(), toupper().

On most platforms these expand simply to the libc function call.  But on
windows, they expand to something more complex, to bring the Windows
calls into POSIX compliance.  Previously that was achieved at the higher
level, with the result that lower level calls were broken.  This
resulted in parts of the test suite being skipped on Windows.

The current level is rewritten to use the new lower layer, with the
result that it is simpler, as the complexity is now done further down.

I thought about calling these macros is_porcelain_isalnum or something
similar to emphaisze that they are close to the bare libc version, but
thought isU8_alnum() is shorter and conveys another truth, that being
the input is assumed to be a byte, without checking.


  Commit: 784281bff9053235d3aae2e0fdcf29cded5f2d2d
      https://github.com/Perl/perl5/commit/784281bff9053235d3aae2e0fdcf29cded5f2d2d
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c
    M vms/vms.c

  Log Message:
  -----------
  locale.c: Use new macros from the prev commit

This should result in Windows boxes now passing the locale sanity
checks.  Previously that failure would cause the test suite tests to be
skipped, and warnings generated to Windows users that actually were
invalid, as the flaws were actually compensated for in other code.


  Commit: 883bb40eee257dc475175eda01497d43b7ce74d2
      https://github.com/Perl/perl5/commit/883bb40eee257dc475175eda01497d43b7ce74d2
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  XXX SEE IF WORKS handy.h: Change Windows macros


  Commit: 63a45d1412773750c51b613ee5aa5c6b10e0c423
      https://github.com/Perl/perl5/commit/63a45d1412773750c51b613ee5aa5c6b10e0c423
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Add isCASED_LC

As a convenience to other code.


  Commit: 47386b8e087d7dc03dea853c6a7a4ab2bc6527e7
      https://github.com/Perl/perl5/commit/47386b8e087d7dc03dea853c6a7a4ab2bc6527e7
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M regexec.c

  Log Message:
  -----------
  regexec.c: Improve code

These case statements in a switch all had the same prelude for checking
if the locale is UTF-8 and handling that case separately.  A few commits
ago created macros closer to the base level.  This commit factors out
the common UTF-8 handling, and then puts the lower lever things in the
switch().  Perhaps the C optimizer will be smart enough to do this too,
but we might as well do it ourselves, now that it is convenient.


  Commit: ab456d0f29c5d1f50be7e680489ad78ff3ab656d
      https://github.com/Perl/perl5/commit/ab456d0f29c5d1f50be7e680489ad78ff3ab656d
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M regexec.c

  Log Message:
  -----------
  regexec.c: Refactor switch default()

It seems clearer to me to have the panic at the end of the routine
instead of as the default: of a switch().


  Commit: 02402f23374cccb4ec9bf65868f933f42618df87
      https://github.com/Perl/perl5/commit/02402f23374cccb4ec9bf65868f933f42618df87
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Declare three static arrays to be so.


  Commit: 91ab4e07ab187530da4733c58eb8c47de9a57a83
      https://github.com/Perl/perl5/commit/91ab4e07ab187530da4733c58eb8c47de9a57a83
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c
    M perl.h

  Log Message:
  -----------
  Move some locale.c #defines to perl.h

This is in preparation for them to be used in macros from outside
locale.c


  Commit: 62e32b4f296be3a29066cb36b27cc877258d9727
      https://github.com/Perl/perl5/commit/62e32b4f296be3a29066cb36b27cc877258d9727
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c
    M perl.h

  Log Message:
  -----------
  Mark newly moved symbols as private

The previous commit made certain symbols that previously were local to
locale.c now available everywhere.  Add a trailing underscore to their
names to mark them as private.


  Commit: 3fb8b7459497390117a581c7cc00a0631ea3a07b
      https://github.com/Perl/perl5/commit/3fb8b7459497390117a581c7cc00a0631ea3a07b
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c
    M makedef.pl
    M perl.h

  Log Message:
  -----------
  Add USE_LOCALE_THREADS #define

This is in preparation for supporting configurations where there threads
are available, but the locale handling code should ignore that fact.

This stems from the unusual locale handling of z/OS, where any attempt
is ignored to change locales after the first thread is created.


  Commit: ac9d31124f6d25c7b3aa2fae350dd7480f7d0fb8
      https://github.com/Perl/perl5/commit/ac9d31124f6d25c7b3aa2fae350dd7480f7d0fb8
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M ext/POSIX/POSIX.xs
    M ext/POSIX/lib/POSIX.pm
    M intrpvar.h
    M locale.c
    M makedef.pl
    M perl.c
    M perl.h
    M sv.c

  Log Message:
  -----------
  Regularize HAS_POSIX_2008_LOCALE, USE_POSIX_2008_LOCALE

A platform shouldn't be required to use the Posix 2008 locale handling
functions if they are present.  Perhaps they are buggy.  So, a separate
define for using them was introduced, USE_POSIX_2008_LOCALE.  But until
this commit there were cases that were looking at the underlying
availability of the functions, not if the Configuration called for their
use.


  Commit: 8a470e9dd07395caedbb8ce648105f5ec18998c9
      https://github.com/Perl/perl5/commit/8a470e9dd07395caedbb8ce648105f5ec18998c9
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Change macro name

Adopt the git convention of 'porcelain' meaning without special
handling.  This makes it clear that porcelain_setlocale() is the base
level.


  Commit: 1901622d1d212908832cb43c0deddeff5e9f7a27
      https://github.com/Perl/perl5/commit/1901622d1d212908832cb43c0deddeff5e9f7a27
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Cast return of setlocale() to const

If they had it to do over again, the libc makers would have made the
return of this function 'const char *'.  We can cast it that way
internally to catch erroneous uses at compile time.


  Commit: 4d2278e98b8e22b9ea83b8d46b3694de2f5da21a
      https://github.com/Perl/perl5/commit/4d2278e98b8e22b9ea83b8d46b3694de2f5da21a
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Create S_get_category_index()

libc locale categories, like LC_NUMERIC, are opaque integers.  This
makes it inconvenient to have table-driven code.  Instead, we have
tables that are indexed by small positive integers, which are a
compile-time mapping from the libc values.

This commit creates a run-time function to also do that mapping.  It
will first be used in the next commit.

The function does a loop through the available categories, looking for a
match.  It could be replaced by some sort of quick hash lookup, but the
largest arrays in the field have a max of 12 elements, with almost all
searches finding their quarry in the first 6.  It doesn't seem
worthwhile to me to replace a linear search of 6 elements by something
more complicated.  The design intent is this search will be used only at
the edges of the locale-handling code; once found the index is used in
future bits of the current operation.


  Commit: 277d58eb6cc5a76ae6c0be0e390089ff8df93f1c
      https://github.com/Perl/perl5/commit/277d58eb6cc5a76ae6c0be0e390089ff8df93f1c
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Use get_category_index()

This creates the first uses of the function added in the previous commit.

It changes the name of a function that now takes an index to have the
suffix _i to indicate its calling parameter is a category index rather
than a category.  This will become a common paradigm in this file in
later commits.

Two macros are also created to call that function; they have suffixes _c
(to indicate the parameter is a category known at compile time, and _r
(to indicate it needs to be computed at runtime).  This is in keeping
with the already existing paradigm in this file.


  Commit: e22d71df85dbd134a5b962c96006c4ec27b33e9b
      https://github.com/Perl/perl5/commit/e22d71df85dbd134a5b962c96006c4ec27b33e9b
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Change S_emulate_setlocale name and sig

It turns out this function is called only from places where we have the
category index already computed; so change the signature to use the
index and remove the re-calculation.

It renames it to emulate_setlocale_i() to indicate that the category
parameter is an index.

This also means, that it's very unlikely that it will be called with an
out-of-bounds value.  Remove the debugging statement for that case (but
retain the error return value).


  Commit: 80dbeddcc86ec5999a8192ff2bc62b5202fd9612
      https://github.com/Perl/perl5/commit/80dbeddcc86ec5999a8192ff2bc62b5202fd9612
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c
    M pod/perldelta.pod
    M pod/perldiag.pod

  Log Message:
  -----------
  locale.c: Simplify S_category_name

We can use the new function S_get_category_index() to simplify this.
Also, when I wrote it I didn't know about Perl_form(), and had
reimplemented a portion of it here; which is yanked as well.


  Commit: 956439fee42697214292837091fa77ee731bbbad
      https://github.com/Perl/perl5/commit/956439fee42697214292837091fa77ee731bbbad
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Move unreachable code

It turns out this code, setting errno, is unreachable.  Move it to the
place where it would do some good, removing an extraneous, unreachable
return;


  Commit: 45cdfd701b72ed4af11e5a3e50e66f8cb9ab7f54
      https://github.com/Perl/perl5/commit/45cdfd701b72ed4af11e5a3e50e66f8cb9ab7f54
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Comment clarifications, white space

Some of these are to make future difference listings shorter

Some of the changes look like incorrect indentation here, but anticipate
future commits.


  Commit: 9a907ee65c1e376dc3c5e27bf66c75b9adb44a9d
      https://github.com/Perl/perl5/commit/9a907ee65c1e376dc3c5e27bf66c75b9adb44a9d
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Move fcn within file

This is for later commits which will change it to rely on new defines
that won't occur until later in the file than its current position


  Commit: c52ac0dadf625255bb1dd3e984fd6c537b1adda3
      https://github.com/Perl/perl5/commit/c52ac0dadf625255bb1dd3e984fd6c537b1adda3
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Separate query part of emulate_setlocale()

This splits a large function so that it is easier to comprehend, and is
in preparation for them to be separately callable.


  Commit: 3523596341497290fd82ef31b3f53d1fa5c4f67c
      https://github.com/Perl/perl5/commit/3523596341497290fd82ef31b3f53d1fa5c4f67c
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Outdent previous commit

The previous commit kept the indentation level the same as it moved code
to a new function, even though an outer block was stripped off in the
process.  This was to minimize diff output.  This commit is white space
only.


  Commit: 66f4aeda0e255214ff47afd19f17c2daee3fa00d
      https://github.com/Perl/perl5/commit/66f4aeda0e255214ff47afd19f17c2daee3fa00d
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Remove spaces around a '##' preprocessor directive

It turns out that at least my gcc preprocessor gets confused in some
contexts if spaces surround the ##.  CAT2() doesn't work for these.

It is working in this context, but future commits will introduce ones
where it won't, so this commit will help make things consistent within
this file

What seems to fail is #define f(x) (..., g(x ## y), ...) where 'x' is a
an already #defined symbol.  I want 'xy', but instead, for example if
'x' has been defined to be 1, I get '1y'


  Commit: 95fdafd70a0458209c3071f97d86a8a2b769a067
      https://github.com/Perl/perl5/commit/95fdafd70a0458209c3071f97d86a8a2b769a067
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: #define some macros in terms of a base one

This is so changes to the lowest level automatically propagate to the
others


  Commit: 7c98c30474e0b80cce2ce916957f9d2231901e94
      https://github.com/Perl/perl5/commit/7c98c30474e0b80cce2ce916957f9d2231901e94
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Create new macros for just querying locale

There are two sets of names, which immediately indicate if the result
can be relied on to be thread level or must be assumed to be global to
the whole process.  At the moment they all expand to the same thing,
since on a threadless perl, it's a don't care; and on a threaded perl,
they are all already thread-level, in the Configurations we support.

Future commits will cause the macros to diverge, and comments will be
added then.

For POSIX 2008, this commit causes queries to go directly to the query
function, avoiding S_emulate_setlocale_i() completely.


  Commit: 61350061ab05da32605418fe4ba7286a97466202
      https://github.com/Perl/perl5/commit/61350061ab05da32605418fe4ba7286a97466202
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Generalize certain Win32 calls

The old versions were windows-specific; the changes use a more generic
macro that currently expands to the same thing, but future commits will
change that.


  Commit: 55b75e9d10cf16aa82d8e88e9d9053e7d4d6f05f
      https://github.com/Perl/perl5/commit/55b75e9d10cf16aa82d8e88e9d9053e7d4d6f05f
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Add a convenience #define

This makes it clear if we are using an array that currently only happens
on non-querylocale systems, but that will change in future commits.


  Commit: 6d32798e4be50e4a0d6f9d91f452a8f6d13c356a
      https://github.com/Perl/perl5/commit/6d32798e4be50e4a0d6f9d91f452a8f6d13c356a
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Add setlocale() return context macros

Future commits will benefit from knowing if the return value of
setlocale is to be ignored, just checked for if it worked, or the full
value is needed and can be relied on (or not) to be per-thread.


  Commit: 9d5141374a9019bfc8104c5b149d6f03f0c7866c
      https://github.com/Perl/perl5/commit/9d5141374a9019bfc8104c5b149d6f03f0c7866c
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Add panic check/message

This panic is done when a setlocale unexpectedly fails.


  Commit: 604c4ee56ed0325a24b71184ef76c40e02467e2a
      https://github.com/Perl/perl5/commit/604c4ee56ed0325a24b71184ef76c40e02467e2a
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Use a function table to simplify code

Some locale categories require extra steps when they are changed.  This
moves that logic to a table, which gets rid of some code


  Commit: 3b1e05aa4114aa0c5be818e2c65ceec33cad332f
      https://github.com/Perl/perl5/commit/3b1e05aa4114aa0c5be818e2c65ceec33cad332f
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  Perl_setlocale(): Same code for all param2 == NULL

Calling Perl_setlocale() with a NULL 2nd parameter returns the current
locale, rather than changing it.  Previously LC_NUMERIC and LC_ALL were
treated specially; other categories were lumped in with the code that
changes the locale.

Changing some categories involves a non-trivial amount of work.  This
commit avoids that by moving all queries to the same 'if' branch.
LC_NUMERIC and LC_ALL still have to be treated specially, but now it's
all within the same outer 'if', and the unnecessarily executing code
for when the locale changes is avoided.


  Commit: de96290a21bc905af649c7ebd40f7b72b4228292
      https://github.com/Perl/perl5/commit/de96290a21bc905af649c7ebd40f7b72b4228292
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Use low level macros at low level

Implementing Perl_setlocale, we can safely use the internal macros that
the public ones expand to call, without the overhead those public macros
impose (which they do to be more immune from improper calls from outside
code).


  Commit: 707f6d4397285853776e1a36abf09c9fd0997beb
      https://github.com/Perl/perl5/commit/707f6d4397285853776e1a36abf09c9fd0997beb
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Remove exploratory code

This code was to find out, in debugging builds, if an undocumented glibc
feature worked.  There were no reports that it didn't, and so, after,
several releases, it has served its purpose.  A future commit will allow
enabling this feature as a Configuration option.


  Commit: 4bbe448bd6fb158f7c96a8847b2eae6d910b2474
      https://github.com/Perl/perl5/commit/4bbe448bd6fb158f7c96a8847b2eae6d910b2474
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  perl.h: Expand scope of cpp conditional

This just doesn't bother with checking some locale-related stuff if not
paying attention to locales.


  Commit: d740c546f37eb720885816c86ff7e56113b4b6ec
      https://github.com/Perl/perl5/commit/d740c546f37eb720885816c86ff7e56113b4b6ec
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c
    M perl.h

  Log Message:
  -----------
  locale.c: Create new convenience macro

glibc doesn't have the querylocale() function, available on some other
platforms, such as Darwin and *BSD.  However, it instead has the
equivalent functionality available through an undocumented feature.

This commit allows someone in the know to compile perl to use that
feature, and wraps its API with a macro so that the calling code doesn't
have to be aware of the different APIs of the two methods.

That macro's definition is now done in perl.h, as future commits will
use it in other files.

Since this is an undocumented feature, I am not currently documenting
this wrapper availability.  However, it has been used in the field
without complaint for a couple of releases, as follows:  A more
cumbersome substitute method continues to be used to get what it does.
But in the past both methods were tried and the program died if they
yielded different results.  Since no one has complained, I'm fairly
confident it works.  But sill I'm deferring its more general use.


  Commit: 0add72138ca1a88d62acebf2f14683daa45c7f4e
      https://github.com/Perl/perl5/commit/0add72138ca1a88d62acebf2f14683daa45c7f4e
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M intrpvar.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: querylocale() doesn't work on LC_ALL

I had misread the man pages.  This bug has been in the field for several
releases now, but most likely hasn't shown up because it's almost always
the case that the locale categories will be set to the same locale.  And
so most implementations of querylocale() would return the correct
result.

This commit works by splitting the calculation of the value of LC_ALL
from S_emulate_setlocale_i() into a separate function, and extending it
to work on querylocale() systems.  This has the added benefit of
removing tangential code from the main line, making
S_emulate_setlocale_i easier to read.

calculate_LC_ALL() is the new function, and is now called from two
places.  As part of this commit, constness is added to PL_curlocales[]

Part of this change is to keep our records of LC_ALL on non-querylocale
systems always up-to-date, which is better practice

And part of this change is temporary, marked as such, to be removed a
few commits later.


  Commit: b91ce0cf9742665dc0dd8b23b43850dc99e20532
      https://github.com/Perl/perl5/commit/b91ce0cf9742665dc0dd8b23b43850dc99e20532
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M intrpvar.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  Make three locale PL_ strings const char*

This adds some compile safety to these.


  Commit: 283bffc99450506ea2008afcaa1dbc99d3506c8d
      https://github.com/Perl/perl5/commit/283bffc99450506ea2008afcaa1dbc99d3506c8d
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Generalize stdsize_locale()

This function is rewritten to handle LC_ALL, and to handle certain buggy
Win32 locale names.  This commit also calls it in appropriate places
where those buggy names could be returned.

setlocale() on Windows may return a locale that cannot be used as input
to a future setlocale().  This is contrary to the C89 standard, and
appears to have been an oversight corrected in the most recent Windows
version(s).

This commit solves the problem (as far as I know) by looking for the
problematic syntax and adjusting it.

I also rewrote the function to handle LC_ALL, which fixes that deficiency.

And, a change in that that I think is an improvement is that everything
starting with a \n is trimmed, instead of just a trailing \n being
chomped.


  Commit: 81bea5beda7f1e5b3495f4248ad9ada9c6a07261
      https://github.com/Perl/perl5/commit/81bea5beda7f1e5b3495f4248ad9ada9c6a07261
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  XXX drop stdize_locale: #if 0, enabled even for emulate


  Commit: 9e9b6828224478b136efd7b93b0c6c36f326ba9b
      https://github.com/Perl/perl5/commit/9e9b6828224478b136efd7b93b0c6c36f326ba9b
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  XXX debug stdized


  Commit: ad1cc1d650cd4aebd89888835cd273a3862750dc
      https://github.com/Perl/perl5/commit/ad1cc1d650cd4aebd89888835cd273a3862750dc
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Refactor some derived #defines

The _c suffix is supposed to mean the category is known at compile time.
In some configurations this does not matter, and so I had named things
carelessly, so this might be confusing.  This commit fixes that.


  Commit: 891a7ab2908e6546622c94450cd02e4667086c42
      https://github.com/Perl/perl5/commit/891a7ab2908e6546622c94450cd02e4667086c42
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Use setlocale() for init, not P2008

We have found bugs in the POSIX 2008 libc implementations on various
platforms.  This code, which does the initialization of locale handling
has always been very conservative, expecting possible failures due to
bugs in it our the libc implementations, and backing out if necessary to
a crippled, but workable state, if something goes wrong.

I think we should use the oldest, most stable locale implementation in
these circumstances


  Commit: fef5a04128e2b8324091a54838e5bfc9cdbe8200
      https://github.com/Perl/perl5/commit/fef5a04128e2b8324091a54838e5bfc9cdbe8200
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Split aggregate LC_ALL from emulate_setlocale

This splits into a separate function the code necessary in some
Configurations to calculate LC_ALL from a potentially disparate
aggregate of categories having different locales.

This is being done just for readability, as this extensive code in the
middle of something else distracts from the main point.

A goto is hence replaced by a recursive call.


  Commit: ae6b3312ae8f4a5bc916ae08719f37d336e79c8d
      https://github.com/Perl/perl5/commit/ae6b3312ae8f4a5bc916ae08719f37d336e79c8d
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Change internal variable name

The new name better reflects its purpose, so is less confusing


  Commit: 059c8b23bd50d3535d114e72a3ded6fa13dc7dba
      https://github.com/Perl/perl5/commit/059c8b23bd50d3535d114e72a3ded6fa13dc7dba
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Clean up handling of a glibc bug

This commit moves all mention of this bug to just the code that requires
it, and inlines a macro, making it easier to comprehend


  Commit: 95ce96aa25bfdff3d307168ea89c8d881cd10186
      https://github.com/Perl/perl5/commit/95ce96aa25bfdff3d307168ea89c8d881cd10186
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Split ancillary from S_emulate_setlocale

This takes the code to update LC_ALL, used only in some Configurations,
out of the main line, making the main line more readable.

It also allows the removal of temporary code added a few commits back


  Commit: a42eb3c46e6793ef0786b0151201fbda8361cf6f
      https://github.com/Perl/perl5/commit/a42eb3c46e6793ef0786b0151201fbda8361cf6f
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: locale "" can be disparate

Setting a locale "" means to get the value from environment variables.
These can set locale categories to different locales, and this needs to
be handled.  The logic before this commit only handled the disparate
case when the locale wasn't ""; but this was compensated for elsewhere.
A future commit will remove that compensation.


  Commit: 65c41c0886803ca36d13f855ac789983a0614818
      https://github.com/Perl/perl5/commit/65c41c0886803ca36d13f855ac789983a0614818
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  Split off setting locale to "" from S_emulate_setlocale

This is done for readability, to move the special casing of setting a
locale to the empty string (hence getting it from the environment) out
of the main line code.


  Commit: 936da17eb06c73672618f47735cf979cc7e87eae
      https://github.com/Perl/perl5/commit/936da17eb06c73672618f47735cf979cc7e87eae
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M sv.c

  Log Message:
  -----------
  sv.c: Duplicate more variables during cloning

These locale-related ones should be getting initialized in the new
thread, but be certain.


  Commit: dcae669dfa5c9bb97d1ff0af94077c19f1c976d3
      https://github.com/Perl/perl5/commit/dcae669dfa5c9bb97d1ff0af94077c19f1c976d3
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M embedvar.h
    M intrpvar.h
    M locale.c
    M makedef.pl
    M perl.c
    M proto.h
    M sv.c

  Log Message:
  -----------
  locale.c: Add fcn to hide edge case undefined behavior

The POSIX 2008 API has an edge case in that the result of most of the
functions when called with a global (as opposed to a per-thread) locale
is undefined.

The duplocale() function is the exception which will create a per-thread
locale containing the values copied from the global one.

This commit just calls duplocale, if needed, and the caller need not
concern itself with this possibility


  Commit: c372b19bd8fb1e0e296c167f46c5e266155172fb
      https://github.com/Perl/perl5/commit/c372b19bd8fb1e0e296c167f46c5e266155172fb
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Add DEBUGGING information

These functions are called as expansions of macros.  It may be useful to
know where in the file the macro occurred.


  Commit: 27af9029be84130542651c78ccc9d22f0b2dbbce
      https://github.com/Perl/perl5/commit/27af9029be84130542651c78ccc9d22f0b2dbbce
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Separate out two Win fcns from a larger one

This makes the larger one easier to understand, and prepares for
possible independent calls to the two, which are potentially useful on
their own.


  Commit: 365c45b61f80bff8315064be2dffb3e5cc4dc64d
      https://github.com/Perl/perl5/commit/365c45b61f80bff8315064be2dffb3e5cc4dc64d
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M ext/POSIX/POSIX.xs

  Log Message:
  -----------
  POSIX.xs: Use macro to reduce complexity

This #defines a macro and uses it to populate a structure, so that
strings don't have to be typed twice.


  Commit: ffb48b2d19db7ec2598761724ed3a729fafbd9b3
      https://github.com/Perl/perl5/commit/ffb48b2d19db7ec2598761724ed3a729fafbd9b3
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M ext/POSIX/POSIX.xs

  Log Message:
  -----------
  POSIX.xs: White-space only

Properly indent some nested preprocessor directives


  Commit: 52be1f4a96721ca4a7e0436551c70f9d7a83e042
      https://github.com/Perl/perl5/commit/52be1f4a96721ca4a7e0436551c70f9d7a83e042
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M ext/POSIX/POSIX.xs
    M locale.c
    M proto.h

  Log Message:
  -----------
  Move code from POSIX.xs to locale.c

This avoids duplicated logic.


  Commit: 769749ff48e3c6b1afaa2a77f75d7d36040b6ee5
      https://github.com/Perl/perl5/commit/769749ff48e3c6b1afaa2a77f75d7d36040b6ee5
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Reorder cases in a switch

This moves handling the CODESET to the end, as future commits will make
its handling more complicated.  The cases are now ordered so the
simplest (based on the direction of future commits) are first


  Commit: 30575eb78dce99e957f3269a60311a9825eafd4a
      https://github.com/Perl/perl5/commit/30575eb78dce99e957f3269a60311a9825eafd4a
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Make statics of repeated string constants

These strings are (or soon will be) used in multiple places; so have
just one definition for them.


  Commit: 142514c398d8621ba3807c06e5c6e6e14120a0b6
      https://github.com/Perl/perl5/commit/142514c398d8621ba3807c06e5c6e6e14120a0b6
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Add two #defines

This makes sure that we handle having any variant of nl_langinfo() or
localeconv().


  Commit: b89fab690c1f9367054f15626c30526ccde2f7cd
      https://github.com/Perl/perl5/commit/b89fab690c1f9367054f15626c30526ccde2f7cd
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Return defaults for uncomputable langinfo items

Return the values from the C locale for nl_langinfo() items that aren't
computable on this platform.  If the platform has nl_langinfo(), then
all of them are computable, but if not, some can't be computed, and
others can be, but only if there are alternative methods available on
the platform.

As part of this commit, S_my_nl_langinfo() and S_save_to_buffer() are no
longer used when USE_LOCALE is not defined, so don't compile them.


  Commit: e52e08447722f68b3aed18e551ebed28f325d7bd
      https://github.com/Perl/perl5/commit/e52e08447722f68b3aed18e551ebed28f325d7bd
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Rmv reimplementation of my_strftime()

Prior to this commit, there was a near duplicate copy of the code from
util.c that implements my_strftime().  This was done because the util.c
version zaps the wday field, which made it incompatible.

But it dawned on me that if the arbitrary date we use to do our
calculations were such that it was for a year in which January 1 falls
on a Sunday, then the util.c version automatically works.


  Commit: f4bffc0b022071dc2365cf3758565c894ee1a524
      https://github.com/Perl/perl5/commit/f4bffc0b022071dc2365cf3758565c894ee1a524
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Shorten static function name

The extra syllable(s) are unnecessary noise


  Commit: e72782b50c0ad9531828977e70796d1d24ca2ff7
      https://github.com/Perl/perl5/commit/e72782b50c0ad9531828977e70796d1d24ca2ff7
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Extend a static function

This will allow it to be used in situations where the buffer it controls
is single use, and we don't need to keep track of the size for future
calls.


  Commit: 880f544982ae69d562e59da8973d5d6bd7df5ee6
      https://github.com/Perl/perl5/commit/880f544982ae69d562e59da8973d5d6bd7df5ee6
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Use typedef to simplify

This allows some preprocessor conditionals to be removed


  Commit: d8f87a25419dd32b26827cb64d99f14d33116fb2
      https://github.com/Perl/perl5/commit/d8f87a25419dd32b26827cb64d99f14d33116fb2
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Rmv redundant cBOOL()

strEQ and && already return booleans


  Commit: 0736ff9d65a7502af2f06471eebede934497ecb5
      https://github.com/Perl/perl5/commit/0736ff9d65a7502af2f06471eebede934497ecb5
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Fix currency symbol derivation

On platforms without nl_langinfo(), we derive the currency symbol from
localeconv().  The symbol must be tweaked to conform to nl_langinfo()
standards.  Prior to this commit, it guessed at how to tweak a rare
circumstance.  I now have seen evidence this guess was wrong, so give up
on it.

This also no longer returns just an empty string in certain cases.
nl_langinfo() itself doesn't, so conform to that.


  Commit: 5f029031a18f9f2ef659c7cc6543ee13101ee813
      https://github.com/Perl/perl5/commit/5f029031a18f9f2ef659c7cc6543ee13101ee813
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Don't add CP to Windows code page names

The actual name appears to be just the number for purposes of
nl_langinfo()-ish things.


  Commit: 180026596311006e18f689d10c64f9ec0f2c27c0
      https://github.com/Perl/perl5/commit/180026596311006e18f689d10c64f9ec0f2c27c0
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Don't ask a static fcn to be inlined

It's too complicated to really be inlined, and the compiler can figure
things out itself given it is a static function


  Commit: 46b6b5c2329262074ebe8080f3f39dc8b12cf5ab
      https://github.com/Perl/perl5/commit/46b6b5c2329262074ebe8080f3f39dc8b12cf5ab
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Rmv no longer used param from static fnc

Previous commits have gotten rid of this parameter to S_save_to_buffer


  Commit: 7840a063a7026f0f73bb696ecd116336ca000542
      https://github.com/Perl/perl5/commit/7840a063a7026f0f73bb696ecd116336ca000542
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Don't change locale if already there

Changing the locale is cheap for some categories, but expensive for
others.  Changing LC_COLLATE is most expensive, requiring recalculation
of the collation transformation mapping.

This commit checks that we aren't already in the desired locale before
changing locales. and does nothing if no change is needed.


  Commit: 5d4ab0ade29d47e7ff814ca27a70daadb306bbf0
      https://github.com/Perl/perl5/commit/5d4ab0ade29d47e7ff814ca27a70daadb306bbf0
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Use a scratch buf; instead of reusing old

This is in preparation for the next commit


  Commit: fad3fb7598e8afae653451a56afc878c04908852
      https://github.com/Perl/perl5/commit/fad3fb7598e8afae653451a56afc878c04908852
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Make static fcn reentrant

This makes my_langinfo() reentrant by adding parameters specifying where
to store the result.

This prepares for future commits, and fixes some minor bugs for XS
writers, in that the claim was that the buffer in calling
Perl_langinfo() was safe from getting zapped until the next call to it
in the same thread.  It turns out there were cases where, because of
internal calls, the buffer did get zapped.


  Commit: 56435d78bebd76b5f4a2de4b97396f7433154518
      https://github.com/Perl/perl5/commit/56435d78bebd76b5f4a2de4b97396f7433154518
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: langinfo: Use Windows fcn to find CODESET

There is a Windows function, available for quite a long time, that will
return the current code page.  Use this for the nl_langinfo() CODESET,
as that libc function isn't implemented on Windows.


  Commit: 9363ddd87e03c810f1347f4f2a2dc74f49cd616e
      https://github.com/Perl/perl5/commit/9363ddd87e03c810f1347f4f2a2dc74f49cd616e
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Add static fcn to analyze locale codeset

It determines if the name indicates it is UTF-8 or not.  There are
several variant spellings in use, and this hides that from the the
callers.

It won't be actually used until the next commit


  Commit: 0a227d589e5b428c21b3b83b4421613bc24f32f0
      https://github.com/Perl/perl5/commit/0a227d589e5b428c21b3b83b4421613bc24f32f0
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M ext/I18N-Langinfo/Langinfo.pm
    M locale.c

  Log Message:
  -----------
  locale.c: Improve non-nl_langinfo() CODESET calc

Prior to this commit, on non-Windows platforms that don't have a
nl_langinfo() libc function, the code completely punted computation of
the CODESET item.  I have not been able to figure out how to do this,
even going to the locale definition files on disk (which may vary
anyway), but we can do a lot better than punting.

This commit adds three checks:

1) If the locale name is C or POSIX, we know the codeset

2) We can detect if a locale is UTF-8.  If it is, that is the codeset.
Many modern locales are of this ilk.

3) Failing that, some locales have the codeset appear in the name,
following a dot.

It isn't perfect, but it's a lot better than completely punting.


  Commit: cde0d7ccac5f825f53d797ebd20adb19297d0d18
      https://github.com/Perl/perl5/commit/cde0d7ccac5f825f53d797ebd20adb19297d0d18
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  New signature for static fcn my_langinfo()

This commit changes the calling sequence for my_langinfo to add the
desired locale (or a sentinel to indicate to use the current locale),
and the locale category of the desired item.

This allows the function to be able to return the desired value for any
locale, avoiding some locale changes that would happen until this
commit, and hiding the need for locale changes from outside functions,
though a couple continue to do so to avoid potential multiple changes.


  Commit: dd89c1227a30cbfec7390fe337c3c7b46f289190
      https://github.com/Perl/perl5/commit/dd89c1227a30cbfec7390fe337c3c7b46f289190
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Add is_locale_utf8()

Previous commits have added the infrastructure to be able to determine
if a locale is UTF-8.  This will prove useful, and this commit adds
a function to encapsulate this information, and uses it in a couple of
places, with more to come in future commits.

This uses as a final fallback, mbtowc(), which some sources view was a
late adder to C89, and others as not really being available until C99.
Future commits will add heuristics when that function isn't available.


  Commit: 24a236635703f9273b7e7e1edda5a2d4ab1a0347
      https://github.com/Perl/perl5/commit/24a236635703f9273b7e7e1edda5a2d4ab1a0347
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Add fcn for UTF8ness determination

get_locale_string_utf8ness_i() will determine if the string it is passed
in the locale it is passed is to be treated as UTF-8, or not.


  Commit: 17076ea9ffc5d36eca6a56cf8499be2271dce023
      https://github.com/Perl/perl5/commit/17076ea9ffc5d36eca6a56cf8499be2271dce023
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M ext/POSIX/POSIX.xs
    M locale.c
    M proto.h

  Log Message:
  -----------
  XXX perldelta Move POSIX::localeconv() logic to locale.c

The code currently in POSIX.xs is moved to locale.c, and reworked some
to fit in that scheme, and the logic for the workaround for the Windows
broken localeconv() is made more robust.

This is in preparation for the next commit which will use this logic
instead of (imperfectly) duplicating it.

This also creates Perl_localeconv() for direct XS calls of this
functionality.


  Commit: f879d0f12c6529155d7319d486022eba673f6f71
      https://github.com/Perl/perl5/commit/f879d0f12c6529155d7319d486022eba673f6f71
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Collapse duplicate logic into one instance

The previous commit move the logic for localeconv() into locale.c.  This
commit takes advantage of that to use it instead of repeating the logic.

On Windows, there is alternative way of finding the radix character for
systems that have a localeconv() that could cause a race.  Prior to this
commit, if that failed to find something that looked like the radix, it
returned a '?'.  Now it will drop down to using this new code, as the
likelihood of the race is small.

Notably, this commit removes the inconsistent duplicate logic that had
been used to deal with the Windows broken localeconv() bug.


  Commit: bcbac95d19832b6b22907979116be67f943faa80
      https://github.com/Perl/perl5/commit/bcbac95d19832b6b22907979116be67f943faa80
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Fix windows bug with broken localeconv()

localeconv() was broken on Windows until VS 2015.  As a workaround, this
was using my_snprintf() to find what the decimal point character is,
trying to avoid our workaround for localeconv(), which has a (slight)
chance of a race condition.

The problem is that my_snprintf() might not end up calling snprintf at
all; I didn't trace all possibilities in Windows.  So it doesn't make
for a reliable sentinel.

This commit now specifically uses libc snprintf(), and if it fails, drops
down to try localeconv().


  Commit: d4f3cde796e0b63e0a12fd514eb81208a863a6d3
      https://github.com/Perl/perl5/commit/d4f3cde796e0b63e0a12fd514eb81208a863a6d3
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M ext/POSIX/POSIX.xs
    M locale.c
    M proto.h

  Log Message:
  -----------
  XXXdelta Add my_strftime8()

This is like plain my_strftime(), but additionally returns an indication
of the UTF-8ness of the returned string


  Commit: 4604ab015ad1ac0e672c813561c6cac29a6e4431
      https://github.com/Perl/perl5/commit/4604ab015ad1ac0e672c813561c6cac29a6e4431
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Add utf8ness return param to static fcn

my_langinfo_i() now will additionally return the UTF-8ness of the
returned string.


  Commit: 200ec0a2666ec2ac5bf32b6004d4f795e488ac19
      https://github.com/Perl/perl5/commit/200ec0a2666ec2ac5bf32b6004d4f795e488ac19
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M ext/I18N-Langinfo/Langinfo.xs
    M locale.c
    M proto.h

  Log Message:
  -----------
  XXXdelta Add Perl_langinfo8()

This is like Perl_langinfo() but additionally returns information about
the UTF-8ness of the returned string.


  Commit: 86d31d4faf943d134133915f3186e98f142417a7
      https://github.com/Perl/perl5/commit/86d31d4faf943d134133915f3186e98f142417a7
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Add fallbacks if no mbtowc()

This add heuristics that work well for non-English locales to determine
if a locale is UTF-8 or not when mbtowc() isn't available.  It would be
a very rare compiler that didn't have that these days, but this covers
that case as best as I have been able to figure out.


  Commit: 100453024615c66fa45380ebce1b71824993a2d2
      https://github.com/Perl/perl5/commit/100453024615c66fa45380ebce1b71824993a2d2
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Use Strerror(), not strerror()


  Commit: af7207a161862e10c4dbf557cf6524e6c3068440
      https://github.com/Perl/perl5/commit/af7207a161862e10c4dbf557cf6524e6c3068440
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Refactor #ifdef's for clarity

The my_strerror() function has effectively 5 different implementations
depending on the capabilities of the platform.  Only a few lines are
common to all, the set-up and the return.  The #ifdefs obscure the
underlying logic.  So this commit separates them out into 5 different
functions, with the result that it's clear what is going on in each.


  Commit: baae46e72db9fd8715cd8c5ef19c34b95d171ea5
      https://github.com/Perl/perl5/commit/baae46e72db9fd8715cd8c5ef19c34b95d171ea5
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  Avoid mojibake in "$!"

In stress testing, I discovered that the LC_CTYPE and LC_MESSAGES
locales need to be the same locale, or strerror() can return
question marks or mojibake instead of the proper message.

This commit refactors the handling of stringifying "$!" to make the
locales of both categories the same during the stringification.

Actually, I suspect it isn't the locale, but the codeset of the locale
that needs to be the same.  I suspect that if the categories were both
in different UTF-8 locales, or both in single-byte locales, that things
would work fine.  But it's cheaper to find the locale rather than the
locale's codeset, so that is what is done.


  Commit: 1af2362c116d81b00444848f8fc2704de60c3754
      https://github.com/Perl/perl5/commit/1af2362c116d81b00444848f8fc2704de60c3754
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M makedef.pl
    M mg.c
    M proto.h

  Log Message:
  -----------
  Move utf8ness calc for $! into locale.c from mg.c

locale.c has the infrastructure to handle this, so remove repeated
logic.

The removed code tried to discern better based on using script runs, but
this actually doesn't help, so is removed.


  Commit: 8441a3b2010db16df9910e5674f048994b34f47b
      https://github.com/Perl/perl5/commit/8441a3b2010db16df9910e5674f048994b34f47b
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M mg.c

  Log Message:
  -----------
  mg.c: White-space only

Indent newly formed block from the previous commit.


  Commit: b2be2d5ee38c23a908abd8b4a4fba52ebb186df5
      https://github.com/Perl/perl5/commit/b2be2d5ee38c23a908abd8b4a4fba52ebb186df5
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M embedvar.h
    M intrpvar.h
    M locale.c
    M proto.h
    M sv.c

  Log Message:
  -----------
  locale.c: Rmv no longer used code; UTF8ness cache

What these functions do has been subsumed by code introduced in previous
commits, and in a more straight forward manner.

Also removed in this commit is the cache of the knowing what locales are
UTF-8 or not.  This data is now cheaper to calculate when needed, and
there is now a single entry cache, so I don't think the complexity
warrants keeping it.

It could be added back if necessary, split off from the remainder of
this commit.


  Commit: afd7e337e3a82e814473b80ea70be579c241e6ff
      https://github.com/Perl/perl5/commit/afd7e337e3a82e814473b80ea70be579c241e6ff
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  Don't discard locale info in starting P2008

The program is started in the global locale, and then is converted to
the POSIX 2008 per-thread locale API.  Prior to this commit the startup
locale was discarded.  It really should be the foundation for the 2008
locales.  I don't know of any current paths through the code that this
makes a difference for, but it is a potential hole that is easy to plug.


  Commit: 119d2bdc11dfea9b768dc581b1c971c441877f01
      https://github.com/Perl/perl5/commit/119d2bdc11dfea9b768dc581b1c971c441877f01
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M perl.h
    M proto.h

  Log Message:
  -----------
  Add a common locale panic macro and functions

This will make sure that all the necessary clean up gets done.


  Commit: dfc57a3ea6be597b788666e00f14f843eae0ff34
      https://github.com/Perl/perl5/commit/dfc57a3ea6be597b788666e00f14f843eae0ff34
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Revamp sync_locale()

This rarely used function was actually failing to do what it purported
in some Configurations.


  Commit: 45004d536863f2a9f4ed6351565fa9281845a722
      https://github.com/Perl/perl5/commit/45004d536863f2a9f4ed6351565fa9281845a722
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Clean up thread_locale_init()

We can use internal functions to this file instead of the API ones here.
This commit also calls  sync_locale() to avoid repeated logic.


  Commit: eb967cc67fbb0078ccfea862ea16935af1434d7b
      https://github.com/Perl/perl5/commit/eb967cc67fbb0078ccfea862ea16935af1434d7b
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  Revamp switch_to_global_locale()

Prior to this commit, the global locale was not always getting populated
with the values from the thread being switched.


  Commit: 2c25d4eb031dee7345fa6c0202f3ca673b0b6b41
      https://github.com/Perl/perl5/commit/2c25d4eb031dee7345fa6c0202f3ca673b0b6b41
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Omit an extra copy

In this case in Perl_setlocale(), we can just return the plain result
from setlocale(), as, if something further needs to be done that would
destroy it, that is taken care of already at the time.

On per-thread locale platforms, the result already is in a per-category
buffer.


  Commit: ae89fee413a11c387ca1dcc98f412d50ab6ab2c8
      https://github.com/Perl/perl5/commit/ae89fee413a11c387ca1dcc98f412d50ab6ab2c8
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embedvar.h
    M intrpvar.h
    M locale.c
    M makedef.pl
    M perl.c
    M sv.c

  Log Message:
  -----------
  locale.c: Cache the current LC_CTYPE locale name

This is now used as a cache of length 1 to avoid having to lookup up the
UTF-8ness as often.

There was a complicated cache previously, but changes to the logic
caused that to be much less necessary, and it is no longer actually
used, and will be removed in a later commit.

But it's pretty easy to keep this single value around to cut further
down the new scheme's need to look it up


  Commit: 5159dabe95a7c8eba4fa3d893856e7039e65b237
      https://github.com/Perl/perl5/commit/5159dabe95a7c8eba4fa3d893856e7039e65b237
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M intrpvar.h

  Log Message:
  -----------
  intrpvar.h: Initialize a variable

I don't believe there is a bug with this PL_numeric_name being
uninitialized, but this is an easy precaution.


  Commit: c8e2d4fe2c72754f04bc87263071f9bf2410aa4d
      https://github.com/Perl/perl5/commit/c8e2d4fe2c72754f04bc87263071f9bf2410aa4d
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c
    M perl.h

  Log Message:
  -----------
  Swap the ordering of two locale category indices

Perl internally uses a mapping of locale category values into a
consecutive sequence of indices starting at 0.  These are used as
indexes into arrays.  The reason is that the category numbers are
opaque, vary by platform, aren't necessarily sequential, and hence are
hard to make table driven code for.

This commit makes the LC_CTYPE index 0, and LC_NUMERIC equal to 1;
swapping them.  The reason is to cause LC_CTYPE to get done first in the
many loops through the categories.  The UTF8ness of categories is an
often needed value, and most of the time the categories will have the
same locale.  LC_CTYPE is needed to calculate the UTF8ness, and by doing
it first and caching the result, the other categories likely
automatically will use the same value, without having to recalculate.


  Commit: b0afbff5d6673a8823e125ddad37d272fd070ab7
      https://github.com/Perl/perl5/commit/b0afbff5d6673a8823e125ddad37d272fd070ab7
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Use new mechanism to save/restore errno

Instead of explicitly saving the errno around debugging statements, the
new more general mechanism is used.


  Commit: 8286b3a6304c70e587dba23670ed270813d2c3c0
      https://github.com/Perl/perl5/commit/8286b3a6304c70e587dba23670ed270813d2c3c0
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  XXX PORCELAIN_SET not yet defined locale.c: Move DEBUG location info

This commit takes advantage of the new mechanism to add common DEBUGGING
code to print the __FILE__ and __LINE__ of every debugging statement.
This allows those to be removed from each statement, and have them
implicitly added.

This make things consistent, and easier to read and add new statements.


  Commit: 9910bb4dd35efda722a4543807d5fda9ed12edb8
      https://github.com/Perl/perl5/commit/9910bb4dd35efda722a4543807d5fda9ed12edb8
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Add some asserts


  Commit: 3da740c876c0cae61028716dab3982a47b91eb4e
      https://github.com/Perl/perl5/commit/3da740c876c0cae61028716dab3982a47b91eb4e
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Reorder code, rmv unneeded conditional

Previous commits have made the conditional about being able to find the
radix character unnecessary.  The called function my_langinfo_c()
handles the case properly.

This commit also makes the trivial case first in a conditional, as that
is easier to comprehend.


  Commit: 4ec4519b6ac5d73742626e92ef922e0ea5e4d482
      https://github.com/Perl/perl5/commit/4ec4519b6ac5d73742626e92ef922e0ea5e4d482
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Reorder 'if' branches

It's better for understandability to have positive tests than negative
ones


  Commit: c1f3182600b4452e3bbdb15aa4d4062aa661ecb7
      https://github.com/Perl/perl5/commit/c1f3182600b4452e3bbdb15aa4d4062aa661ecb7
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Refactor a static function

S_new_numeric() is called after the LC_NUMERIC category is changed, to
update various ancillary information Perl keeps.

This reorders the function so that on POSIX 2008 platforms, the numeric
object is created earlier.  This allows for fewer operations on those
platforms, as we already have the correct value in place for querying
what the radix and thousands separator characters are.

Explanatory comments are also added.


  Commit: a3835af7a0a34f3d9b141305692c9e393eedaf91
      https://github.com/Perl/perl5/commit/a3835af7a0a34f3d9b141305692c9e393eedaf91
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Change assert() into STATIC_ASSERT()


  Commit: 180ea0ac0f7250deb54c35edbf32c6eaaa42858b
      https://github.com/Perl/perl5/commit/180ea0ac0f7250deb54c35edbf32c6eaaa42858b
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Use standard fold table for C locale

Copy the standard compiled-in ASCII fold table when the locale is C or
POSIX, instead of looping through all 256 characters and computing them.
This saves some time as well as ensures that any platform bugs become
irrelevant.


  Commit: 1bed6a249aa97bf711f09e8e1c06f5890b6663c7
      https://github.com/Perl/perl5/commit/1bed6a249aa97bf711f09e8e1c06f5890b6663c7
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Add check that strxfrm didn't fail

The code failed to take into account that strxfrm() can fail for reasons
besides buffer length.  It does not return errors, and the only way to
check is to set errno to 0 beforehand, and check that it is still 0
afterwards.


  Commit: 7bb457a8efc82a819e3663f8945f0f0090397125
      https://github.com/Perl/perl5/commit/7bb457a8efc82a819e3663f8945f0f0090397125
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Don't assume LC_CTYPE, LC_COLLATE are same

This code is using isCNTRL_LC which depends on LC_CTYPE to verify that
something in the LC_COLLATE locale is a control.  That only works
properly if the two locales are the same.  This commit adds code to
ensure they are.


  Commit: 608e16673d507b494d39d3c00ed7980ab97b8521
      https://github.com/Perl/perl5/commit/608e16673d507b494d39d3c00ed7980ab97b8521
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: strxfrm() requires LC_CTYPE eq LC_COLLATE

The libc functions strxfrm() on some platforms requires the LC_CTYPE
locale to be the same as the LC_COLLATE locale (or rather, probably that
they have the same code set, but checking for locale is cheaper).
Otherwise mojibake would result, or more likely the function will fail,
setting errno.

This commit brings the locales into alignment if necessary


  Commit: ac9c86f7c8b1bb10ddcf6f34b51fa2e018de318a
      https://github.com/Perl/perl5/commit/ac9c86f7c8b1bb10ddcf6f34b51fa2e018de318a
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M Configure
    M Cross/config.sh-arm-linux
    M Cross/config.sh-arm-linux-n770
    M NetWare/config.wc
    M Porting/config.sh
    M config_h.SH
    M configure.com
    M metaconfig.h
    M plan9/config_sh.sample
    M uconfig.h
    M uconfig.sh
    M uconfig64.sh
    M win32/config.gc
    M win32/config.vc

  Log Message:
  -----------
  Configure: strxfrm_l


  Commit: e5a9610b04b1e60049bdc113c624641b283129c8
      https://github.com/Perl/perl5/commit/e5a9610b04b1e60049bdc113c624641b283129c8
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M lib/locale.t

  Log Message:
  -----------
  XXX temp: Windows debug


  Commit: 648cad367a649b16fd277801f35abfee99827ecf
      https://github.com/Perl/perl5/commit/648cad367a649b16fd277801f35abfee99827ecf
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Use strxfrm_l() if available

This more modern version of the function doesn't require us to change
locales.


  Commit: 8fba0b54fa3240ab02b829ca3153d5aa0160c52a
      https://github.com/Perl/perl5/commit/8fba0b54fa3240ab02b829ca3153d5aa0160c52a
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M mathoms.c
    M proto.h
    M sv.c

  Log Message:
  -----------
  Change name of internal function

This is in preparation for working on it; the new name, mem_collxfrm_ is
in compliance with the C Standard; the old was not.


  Commit: c44bce67c63428396d71d56ffd9316ccd2ee1aa2
      https://github.com/Perl/perl5/commit/c44bce67c63428396d71d56ffd9316ccd2ee1aa2
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M ext/POSIX/POSIX.xs
    M ext/POSIX/lib/POSIX.pod
    M locale.c
    M proto.h

  Log Message:
  -----------
  XXXdelta Fix POSIX::strxfrm()

This function takes an SV containing a PV.  The encoding of that PV is
based on the locale of the LC_CTYPE locale.  It really doesn't make
sense to collate based off of the sequencing of a different locale, which
prior to this commit it would do if the LC_COLLATION locale were
different.


  Commit: 06ff9ebbca8863a785da782fdbc5f76c060677bf
      https://github.com/Perl/perl5/commit/06ff9ebbca8863a785da782fdbc5f76c060677bf
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Improve debugging for mem_collxfrm()

This prints out more information, better organized.

It also moves up the info from -DLv to plain -DL


  Commit: d7eda419f82e15383533fa30cbfc593ac5851cfa
      https://github.com/Perl/perl5/commit/d7eda419f82e15383533fa30cbfc593ac5851cfa
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Add debug statement for collation failure

Perhaps this should be a warning to the user that we couldn't calculate
collation info for the locale, but at least there should be a way to
get that info from a DEBUG statement


  Commit: 76eaee1a5f22712305fa6f8abba2f2ed79a1a477
      https://github.com/Perl/perl5/commit/76eaee1a5f22712305fa6f8abba2f2ed79a1a477
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Print code point in hex, not decimal

Hex is the more familiar form


  Commit: 8774df3dac5c1b015d5cb12c214a8d0ab4072001
      https://github.com/Perl/perl5/commit/8774df3dac5c1b015d5cb12c214a8d0ab4072001
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M ext/POSIX/POSIX.xs
    M locale.c
    M perl.h

  Log Message:
  -----------
  Mark certain mutex lock macros as private

mbtowc() mblen(), and wctomb() should not be directly used by XS
writers; instead use the POSIX versions.  Don't encourage the direct use
by having public macros to aid in their use.


  Commit: c4930c6d9f311bf35c8076cf4e673043009209f6
      https://github.com/Perl/perl5/commit/c4930c6d9f311bf35c8076cf4e673043009209f6
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  perl.h: Move some code around

This is purely to make future commits have smaller real difference
listings, and involves a temporary (complemented) copy of a preprocessor
conditional.


  Commit: 08a2ef9ec997b31e0b1804050147d1942c9e04b8
      https://github.com/Perl/perl5/commit/08a2ef9ec997b31e0b1804050147d1942c9e04b8
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  perl.h: Reorder cpp branches

Disposing of the trivial case first makes things easier to read.


  Commit: cd61e3f9285e1da99e45bddc4180ecf48e5c68c4
      https://github.com/Perl/perl5/commit/cd61e3f9285e1da99e45bddc4180ecf48e5c68c4
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embedvar.h
    M intrpvar.h
    M locale.c
    M makedef.pl
    M perl.h
    M sv.c

  Log Message:
  -----------
  Make the locale mutex a general semaphore

Future commits will use this new capability, and in Configurations where
no locale locking is currently necessary.


  Commit: 08ad8661f156e2aa1810d589c61feb329e0d66a4
      https://github.com/Perl/perl5/commit/08ad8661f156e2aa1810d589c61feb329e0d66a4
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embedvar.h
    M intrpvar.h
    M makedef.pl
    M perl.h
    M perlvars.h
    M sv.c

  Log Message:
  -----------
  Use general locale mutex for numeric operations

This commit removes the separate mutex for locking locale-related
numeric operations on threaded perls; instead using the general locale
one.  The previous commit made that a general semaphore, so now suitable
for use for this purpose as well.

This means that the locale can be locked for the duration of some
sprintf operations, longer than before this commit.  But on most modern
platforms, thread-safe locales cause this lock to expand just to a
no-op; so there is no effect on these.  And on the impacted platforms,
one is not supposed to be using locales and threads in combination, as
races can occur.  This lock is used on those perls to keep Perl's
manipulation of LC_NUMERIC thread-safe.  And for those there is also no
effect, as they already lock around those sprintf's.


  Commit: 2e204c703b93d57fc00cb208a1993a330aa6af49
      https://github.com/Perl/perl5/commit/2e204c703b93d57fc00cb208a1993a330aa6af49
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  Add locale macro to wrap static-space-using fncs

Some functions return a result in a global-to-the-program buffer, or
they have an internal global buffer.  Other threads must be kept from
simultaneously using that function.  This macro is to be used for all
such ones dealing with locales.  Ideally, there would be a separate mutex
for each such buffer space.  But these functions also have to lock the
locale from changing during their execution, and there aren't that many
such functions, and they actually are rarely executed.  So a single lock
will do.

This will allow future commits to have more targeted locking for
functions that don't affect the global locale.


  Commit: c90d2fcd7ebc4f58ca42b01c0256cdc68f0c4444
      https://github.com/Perl/perl5/commit/c90d2fcd7ebc4f58ca42b01c0256cdc68f0c4444
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  Redefine the POSIX.xs locale macros using prev commit

This commit uses the new macro introduced in the previous commit to
define the internal locale mutex macros in POSIX.xs


  Commit: bf96611b86eaed1bc6c491c8f5fb91e887d3d437
      https://github.com/Perl/perl5/commit/bf96611b86eaed1bc6c491c8f5fb91e887d3d437
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c
    M perl.h

  Log Message:
  -----------
  perl.h: Remove NL_LANGINFO_LOCK

This is needed in precisely one place in the code, so move it to there.


  Commit: 88b7ac2a48318d891b2c9c96bacdcf0b9c98c20e
      https://github.com/Perl/perl5/commit/88b7ac2a48318d891b2c9c96bacdcf0b9c98c20e
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c
    M perl.h

  Log Message:
  -----------
  perl.h: Remove LOCALECONV_LOCK

This is needed in just one function, in locale.c, so more it there.


  Commit: af67376c1f47bf7addf12073501b2efd7915dd7e
      https://github.com/Perl/perl5/commit/af67376c1f47bf7addf12073501b2efd7915dd7e
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c
    M perl.h

  Log Message:
  -----------
  XXX perlembed Add PORCELAIN_SETLOCALE_LOCK/UNLOCK

This macro is used to surround raw setlocale() calls so that the return
value in a global static buffer can be saved without interference with
other threads.

There are a few very rarely occurring instances in locale.c that are
converted to use this.  These previously could have been races.

The raw setlocales in the initialization function are not guarded, as
these happen early in the Perl process initialization, before threading
is enabled.

This is buggy if there are multiple embedded perls.  It can't be helped.
perlembed is being updated to indicate this.


  Commit: 9beaaffc9527dfc4730ef29f3b4eb7ed40b8a127
      https://github.com/Perl/perl5/commit/9beaaffc9527dfc4730ef29f3b4eb7ed40b8a127
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  perl.h: Move #defining SETLOCALE_LOCK

This simplifies slightly, and will allow further simplification


  Commit: 3f0c8ecc084bf8a80d2adba7c28864aba5abfa6f
      https://github.com/Perl/perl5/commit/3f0c8ecc084bf8a80d2adba7c28864aba5abfa6f
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  perl.h: Move LOCALE_READ_LOCK #definition

To enable future simplifications


  Commit: 19ade1aa64aedda571e1bf2b12a9230521129662
      https://github.com/Perl/perl5/commit/19ade1aa64aedda571e1bf2b12a9230521129662
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M intrpvar.h
    M locale.c
    M makedef.pl
    M perl.c
    M perl.h
    M sv.c

  Log Message:
  -----------
  locale.c: Move #define to perl.h; use it elsewhere

 Rather than recalculate this combined conditional, do it once in
 perl.h.


  Commit: 38f28d5943a7c971f0497d486120147746adf03e
      https://github.com/Perl/perl5/commit/38f28d5943a7c971f0497d486120147746adf03e
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Mitigate unsafe threaded locales

This a new set of macros and functions to do locale changing and
querying for platforms where perl is compiled with threads, but the
platform doesn't have thread-safe locale handling.

All it does is:

1) The return of setlocale() is always safely saved in a per-thread
buffer, and
2) setlocale() is protected by a mutex from other threads which are
using perl's locale functions.

This isn't much, but it might be enough to get some programs to work on
such platforms which rarely change or query the locale.


  Commit: c444f0ed59f5ab4de66fdb8e04d5210ebbed0943
      https://github.com/Perl/perl5/commit/c444f0ed59f5ab4de66fdb8e04d5210ebbed0943
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  XXX make sure comments get moved appropriately perl.h: Remove now empty block

Previous commits have left this empty except for comments.


  Commit: b5e1effcebae2636dcb28a63cd5f0094fe4c965a
      https://github.com/Perl/perl5/commit/b5e1effcebae2636dcb28a63cd5f0094fe4c965a
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M pp.c

  Log Message:
  -----------
  XXX pp.c: do %g print under mutex,


  Commit: 54b785c3e0f5cc33cdce7a906ea86ba321719add
      https://github.com/Perl/perl5/commit/54b785c3e0f5cc33cdce7a906ea86ba321719add
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M ebcdic_tables.h
    M embedvar.h
    M globvar.sym
    M inline.h
    M intrpvar.h
    M perl.h
    M regen/ebcdic.pl
    M sv.c

  Log Message:
  -----------
  Make fc(), /i thread-safe on participating platforms

A long standing bug in Perl that has gone undetected is that the array
is global that is created when changing locales and tells fc() and qr//i
matching what the folds are in the new locale.

What this means is that any program only has one set of fold definitions
that apply to all threads within it, even if we claim that the locales
are thread-safe on the given platform.  One possibility for this going
undetected so long is that no one is using locales on multi-threaded
systems much.  Another possibility is that modern UTF-8 locales have the
same set of folds as any other one.

It is a simple matter to make the fold array per-thread instead of
per-process, and that solves the problem transparently to other code.

I discovered this stress-testing locale handling under threads.  That
test will be added in a future commit.


  Commit: b46539d41dc3571ec8658245646907380ed6d5d9
      https://github.com/Perl/perl5/commit/b46539d41dc3571ec8658245646907380ed6d5d9
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M inline.h
    M locale.c

  Log Message:
  -----------
  XXX temp debug? locale.c, inline.h:foldEQ_locale


  Commit: b05b9e3fd80ced0a9d00dfab4b267c1f070b90c7
      https://github.com/Perl/perl5/commit/b05b9e3fd80ced0a9d00dfab4b267c1f070b90c7
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c comments


  Commit: b1bdb1bd367beb95fa81c4a1f316d3fc94a2127f
      https://github.com/Perl/perl5/commit/b1bdb1bd367beb95fa81c4a1f316d3fc94a2127f
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  XXX prob drop; done before anything so no races


  Commit: 67676cde926710d4f47bb0449b0e87d45779c2d6
      https://github.com/Perl/perl5/commit/67676cde926710d4f47bb0449b0e87d45779c2d6
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  perl.h: Add #define for gwENVr_LOCALEr_UNLOCK

This is for functions that read the locale and environment and write to
some global space.


  Commit: f97dc97b12c2dec74640da7f92c277d98b7aba19
      https://github.com/Perl/perl5/commit/f97dc97b12c2dec74640da7f92c277d98b7aba19
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h
    M time64.c

  Log Message:
  -----------
  Remove ENV_LOCALE_LOCK/UNLOCK macros

These are subsumed by gwENVr_LOCALEr_LOCK created in the previous
commit.


  Commit: 5e92888bd5a0a7508a9d30291ef145320a6741e9
      https://github.com/Perl/perl5/commit/5e92888bd5a0a7508a9d30291ef145320a6741e9
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h
    M time64.c
    M util.c

  Log Message:
  -----------
  Change ENV/LOCALE locking read macro names

The old name was confusing.


  Commit: 2c76343fb660ed6c5fa417f000d411e68fa7e9b3
      https://github.com/Perl/perl5/commit/2c76343fb660ed6c5fa417f000d411e68fa7e9b3
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  perl.h: Move some statements

So they are closer to related statements


  Commit: 21a580bd6b6532a82a031d5a93daf34d2c1a4873
      https://github.com/Perl/perl5/commit/21a580bd6b6532a82a031d5a93daf34d2c1a4873
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h
    M util.c

  Log Message:
  -----------
  perl.h: Finish implementing combo ENV/LOCALE mutexes

There are cases where an executing function is vulnerable to either the
locale or environment being changed by another thread.  This commit
implements macros that use mutexes to protect these critical sections.
There are two cases that exist:  one where the functions only read; and
one where they can also need exclusive control so that a competing
thread can't overwrite the returned static buffer before it is safely
copied.

5.32 had a placeholder for these, but didn't actually implement it.
Instead it locked just the ENV portion.  On modern platforms with
thread-safe locales, the locale portion is a no-op anyway, so things
worked on them.

This new commit extends that safety to other platforms.  This has long
been a vulnerability in Perl.


  Commit: 8af79752a697393808ac747267b766849d1d53f5
      https://github.com/Perl/perl5/commit/8af79752a697393808ac747267b766849d1d53f5
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M time64.c

  Log Message:
  -----------
  time64.c: Remove no longer needed code

This code defined some macros; those are now defined by perl.h


  Commit: f3a6a198a16b5d78a7d5d1b9240a59aa39c724d6
      https://github.com/Perl/perl5/commit/f3a6a198a16b5d78a7d5d1b9240a59aa39c724d6
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M pp_sys.c

  Log Message:
  -----------
  XXX need to StructCopy pp_sys mutexes


  Commit: 2af35288bc0663817ea0cdd5266c19dc58b3a5b9
      https://github.com/Perl/perl5/commit/2af35288bc0663817ea0cdd5266c19dc58b3a5b9
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M win32/win32.c

  Log Message:
  -----------
  win32.c: Add mutexes around some calls

These could have races.


  Commit: 8b5b4b704b09cc729ce569fa83f2049689e9cc32
      https://github.com/Perl/perl5/commit/8b5b4b704b09cc729ce569fa83f2049689e9cc32
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M ext/POSIX/POSIX.xs

  Log Message:
  -----------
  POSIX.xs env locks, check file for more


  Commit: 2a2c6b182ff1531e3b9665b11fe2ad7b9a2aa473
      https://github.com/Perl/perl5/commit/2a2c6b182ff1531e3b9665b11fe2ad7b9a2aa473
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M util.c

  Log Message:
  -----------
  util.c: mktime needs to run under a mutex

per the Posix standard


  Commit: db1894158b0a4b0fa0645c2849f12645afcdce23
      https://github.com/Perl/perl5/commit/db1894158b0a4b0fa0645c2849f12645afcdce23
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M util.c

  Log Message:
  -----------
  util.c: Add locks around strftime() calls


  Commit: 82b009de6efb8c6f383add53e707e8ee7911d76c
      https://github.com/Perl/perl5/commit/82b009de6efb8c6f383add53e707e8ee7911d76c
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M cygwin/cygwin.c

  Log Message:
  -----------
  cygwin


  Commit: a394fd1b55fac9ad0371dd55f3c724b02946574c
      https://github.com/Perl/perl5/commit/a394fd1b55fac9ad0371dd55f3c724b02946574c
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M os2/os2.c

  Log Message:
  -----------
  os2: Use many reader lock instead of exclusive

This is just reading the environment, not changing it, so a many readers
can be accessing it at the same time.


  Commit: 0ba82e74a64977f2fe40eebc55a7fd8f1f0c879b
      https://github.com/Perl/perl5/commit/0ba82e74a64977f2fe40eebc55a7fd8f1f0c879b
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M cpan/Time-Piece/Piece.pm
    M cpan/Time-Piece/Piece.xs

  Log Message:
  -----------
  XXX cpan PR Time-Piece: Add locks

This add mutex locking around some unsafe thread operations to make this
module thread-safe.


  Commit: 5e06da75e434629a7eeca22c1ab89432bf029054
      https://github.com/Perl/perl5/commit/5e06da75e434629a7eeca22c1ab89432bf029054
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M cpan/Time-Piece/Piece.xs

  Log Message:
  -----------
  Time-Piece: Use foldEQ_locale() if available

This supported core function is thread-safe and knows about Perl
internals, so is preferable to the similar libc function, which is now
used only as a fallback.  This commit also bomb proofs the code by
adding an additional fallback, specified in C89, which isn't a great
substituted, but far better than nothing.


  Commit: e95d736fa8baa58cb1258723641ac4608ab28eec
      https://github.com/Perl/perl5/commit/e95d736fa8baa58cb1258723641ac4608ab28eec
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M cpan/Time-Piece/Piece.xs

  Log Message:
  -----------
  Time-Piece: Use isSPACE, not isspace

The latter gives results that are dependent on the program's underlying
locale, and so may be inconsistent.

If locale dependence is actually desired, isSPACE_LC should be used, as
it knows about various things the module writer shouldn't have to
concern themselves with.  It is supported since 5.004


  Commit: ad6b006cd448f14298eb26154daab85a67cf3adf
      https://github.com/Perl/perl5/commit/ad6b006cd448f14298eb26154daab85a67cf3adf
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M cpan/Time-Piece/Piece.xs

  Log Message:
  -----------
  Time-Piece: Use isDIGIT, not isdigit

The latter gives results that are dependent on the program's underlying
locale, and so may be inconsistent.

If locale dependence is actually desired, isDIGIT_LC should be used, as
it knows about various things the module writer shouldn't have to
concern themselves with.  It is supported since 5.004


  Commit: 7cda7696c3df18f3c28848a511df8056d04653fc
      https://github.com/Perl/perl5/commit/7cda7696c3df18f3c28848a511df8056d04653fc
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M cpan/Time-Piece/Piece.xs

  Log Message:
  -----------
  Time-Piece: Use isUPPER, not isupper

The latter gives results that are dependent on the program's underlying
locale, and so may be inconsistent.

If locale dependence is actually desired, isUPPER_LC should be used, as
it knows about various things the module writer shouldn't have to
concern themselves with.  It is supported since 5.004


  Commit: f301639fc1ff7f078dc837583d77a3cdd87f8ef0
      https://github.com/Perl/perl5/commit/f301639fc1ff7f078dc837583d77a3cdd87f8ef0
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M pod/perlhacktips.pod

  Log Message:
  -----------
  XXX incomplete perlhacktips:


  Commit: 084d3944b4745d872a161b00f2ddf638c982d0ba
      https://github.com/Perl/perl5/commit/084d3944b4745d872a161b00f2ddf638c982d0ba
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M dist/IO/IO.pm
    M dist/IO/IO.xs

  Log Message:
  -----------
  XXX check if using ppport IO.xs: Remove fallback code furnished by ppport


  Commit: a4ca2fb6f88f087645907cc326b435c9f307b374
      https://github.com/Perl/perl5/commit/a4ca2fb6f88f087645907cc326b435c9f307b374
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M hints/freebsd.sh

  Log Message:
  -----------
  XXX check with freebsd: hints/freebsd.sh


  Commit: 2410af0251524ba78115641dfd5eaf75cc25d078
      https://github.com/Perl/perl5/commit/2410af0251524ba78115641dfd5eaf75cc25d078
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M thread.h

  Log Message:
  -----------
  thread.h: White-space, braces only


  Commit: 27135de9b1e715495755b13662b093d6616b8e4b
      https://github.com/Perl/perl5/commit/27135de9b1e715495755b13662b093d6616b8e4b
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M thread.h

  Log Message:
  -----------
  XXX thread.h Save errno around lock/unlock


  Commit: 2ec313dd117af1eefca26d11a6bc354973f23edd
      https://github.com/Perl/perl5/commit/2ec313dd117af1eefca26d11a6bc354973f23edd
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  XXX perl.h: Debugging mutex lock'


  Commit: 923eab8aa1773478b5725ddf5a4bc40c18435c71
      https://github.com/Perl/perl5/commit/923eab8aa1773478b5725ddf5a4bc40c18435c71
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M cpan/Time-Piece/Piece.xs
    M handy.h
    M iperlsys.h
    M locale.c
    M perl.h
    M regen/reentr.pl
    M regexec.c
    M sv.c
    M util.c

  Log Message:
  -----------
  Notes


  Commit: d6c2a913346c7a8605c63d50c6f0149875130e60
      https://github.com/Perl/perl5/commit/d6c2a913346c7a8605c63d50c6f0149875130e60
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M ext/POSIX/POSIX.xs
    M locale.c
    M perl.h

  Log Message:
  -----------
  locks


  Commit: 9e2f0a86563c8a24ce9d9ed9bd2e016ad88b57f4
      https://github.com/Perl/perl5/commit/9e2f0a86563c8a24ce9d9ed9bd2e016ad88b57f4
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  XXX locale.c: Kludge because C obj getting destroyed


  Commit: 496dc2ae5ad43442ba072a4ebc36833c76844422
      https://github.com/Perl/perl5/commit/496dc2ae5ad43442ba072a4ebc36833c76844422
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M .github/workflows/testsuite.yml

  Log Message:
  -----------
  Make DEBUGGING the default on CI


  Commit: 3755335bfdd6832b30a374cf7353d5f5d6aeee84
      https://github.com/Perl/perl5/commit/3755335bfdd6832b30a374cf7353d5f5d6aeee84
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M t/run/locale.t

  Log Message:
  -----------
  t/run/locale.t


  Commit: d01a51ab0f1c8f325ee8f0fad7e980f9e9f263ef
      https://github.com/Perl/perl5/commit/d01a51ab0f1c8f325ee8f0fad7e980f9e9f263ef
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M t/run/locale.t

  Log Message:
  -----------
  t/run/locale.t: Move init stmt

This makes it easier to add a line to turn on debugging temporarily


  Commit: ed5054861b8907cc2e6d7678a228aa218f7eb010
      https://github.com/Perl/perl5/commit/ed5054861b8907cc2e6d7678a228aa218f7eb010
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M t/run/locale.t

  Log Message:
  -----------
  XXX run/locale.t temp win


  Commit: eff08db7ec4a57193cbabb8746c8a6bc838c6c35
      https://github.com/Perl/perl5/commit/eff08db7ec4a57193cbabb8746c8a6bc838c6c35
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M t/porting/customized.dat
    M vutil.c

  Log Message:
  -----------
  vutil.c: Clean up white space

Change tabs to blanks; Fix indentation; chomp trailing white space

Remove some blank lines that don't contribute to readability


  Commit: fd3b648218590e8930362d0000c7b91a03e45faf
      https://github.com/Perl/perl5/commit/fd3b648218590e8930362d0000c7b91a03e45faf
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M t/porting/customized.dat
    M vutil.c

  Log Message:
  -----------
  vutil.c: Simplify locale handling

I read the code over and realized that there was a much simpler way to
do things.


  Commit: 829b566474b801d5c492784b68f147abcbf99f03
      https://github.com/Perl/perl5/commit/829b566474b801d5c492784b68f147abcbf99f03
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Change a branch into an assert

This code should no longer be necessary; but verify


  Commit: e20127c4b112c434fd2abcc1121b16765efb5090
      https://github.com/Perl/perl5/commit/e20127c4b112c434fd2abcc1121b16765efb5090
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M t/loc_tools.pl

  Log Message:
  -----------
  XXX loc_tools: debug, white space


  Commit: 183dbdc9ded0ba54a6a88583397f9917241be076
      https://github.com/Perl/perl5/commit/183dbdc9ded0ba54a6a88583397f9917241be076
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M embed.h
    M locale.c
    M proto.h

  Log Message:
  -----------
  Add pTHX to locale_thread_init()


  Commit: cff6fd85fd9ae5dba718c5f1810c2528cae8babf
      https://github.com/Perl/perl5/commit/cff6fd85fd9ae5dba718c5f1810c2528cae8babf
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  l


  Commit: ee2cdfd8247ea2dacac76f8ce3d40aabfe39b504
      https://github.com/Perl/perl5/commit/ee2cdfd8247ea2dacac76f8ce3d40aabfe39b504
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embedvar.h
    M intrpvar.h
    M locale.c
    M sv.c

  Log Message:
  -----------
  PLcurlocales


  Commit: 0ff9bca55df99aafaa36d687a6b4a8a101e4016e
      https://github.com/Perl/perl5/commit/0ff9bca55df99aafaa36d687a6b4a8a101e4016e
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M lib/locale.t

  Log Message:
  -----------
  lib/locale.t FILE debug


  Commit: 4970bca4b8a316c77faec70b30c98a4c63497a3d
      https://github.com/Perl/perl5/commit/4970bca4b8a316c77faec70b30c98a4c63497a3d
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: windows DEBUG stmts


  Commit: f311983e05afdd8b202eb77f12eb05df6b425e0e
      https://github.com/Perl/perl5/commit/f311983e05afdd8b202eb77f12eb05df6b425e0e
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M proto.h

  Log Message:
  -----------
  f save_to_buffer ignore return


  Commit: ab9065716dc7e15b2466cb6fd6a7ebbf7330fcca
      https://github.com/Perl/perl5/commit/ab9065716dc7e15b2466cb6fd6a7ebbf7330fcca
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Add layer for char classification/case change

This layer currently expands to just the layer below it, but that will
be changed in a future commit.


  Commit: cb8936edb4768e3aabd2c0c26b137e2d2c77d3a0
      https://github.com/Perl/perl5/commit/cb8936edb4768e3aabd2c0c26b137e2d2c77d3a0
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M dist/ExtUtils-ParseXS/lib/perlxs.pod
    M t/porting/known_pod_issues.dat

  Log Message:
  -----------
  perlxs


  Commit: d8584436e70d40c742ff3ca93d7065b01bf5dd26
      https://github.com/Perl/perl5/commit/d8584436e70d40c742ff3ca93d7065b01bf5dd26
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  XXX Temp dont use querylocale()


  Commit: 19cb56d474f6b4d48611445b2630ac9594a31c9b
      https://github.com/Perl/perl5/commit/19cb56d474f6b4d48611445b2630ac9594a31c9b
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  l


  Commit: 4e56a355f8ebc4ed1440e4da3d36956bad59e30a
      https://github.com/Perl/perl5/commit/4e56a355f8ebc4ed1440e4da3d36956bad59e30a
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embedvar.h
    M intrpvar.h
    M locale.c
    M sv.c

  Log Message:
  -----------
  Revert "PLcurlocales"

This reverts commit cd1fd76eac05b9ca866bb6f1dae6151767aa3d76.


  Commit: a2271a8bfb218cc26da8bf718aa595efd3306752
      https://github.com/Perl/perl5/commit/a2271a8bfb218cc26da8bf718aa595efd3306752
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M locale.c
    M proto.h

  Log Message:
  -----------
  locale.c: Rmv unused code

The code to handle changing LC_COLLATION handled the possibility of
being passed a NULL locale name.  But we're not changing things unless
we have a new locale, and know its name.


  Commit: 24d1e6aae96fbbc52bb2dfbe8ffafbdb6a0efb25
      https://github.com/Perl/perl5/commit/24d1e6aae96fbbc52bb2dfbe8ffafbdb6a0efb25
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M intrpvar.h

  Log Message:
  -----------
  intrpvar.h: Swap position of two defns; add comment


  Commit: 966a422f711a1cb0053ef3e8da7a1e945c08f63f
      https://github.com/Perl/perl5/commit/966a422f711a1cb0053ef3e8da7a1e945c08f63f
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M intrpvar.h
    M locale.c

  Log Message:
  -----------
  locale.c: Add 'Lazy' location changing

When comparing two strings for order under 'use locale', one can call
strcoll() which creates hidden modified versions of the strings based on
the locale's collation ordering, does the comparison, and then throws
away the modified versions.

Or one can call strxfrm() to create a non-hidden modified version of
each string, and then do a straight comparison.  The advantage here is
that you are in control of when to discard the modified version, and the
(expensive) transformation is done just once, no matter how many times a
comparison is done.

Perl assumes that a string will be compared multiple times, so the first
time it happens under 'use locale', strxfrm() is called, and the
modified string is attached via magic to the SV.  The modified string is
discarded if the string changes, or is recomputed if the locale has
changed since the computation was done.

The transformation generally occupies some multiple of size of the
original string.  Memory must be allocated to hold it.  For any given
locale, the amount is predictable for all strings, roughly via a linear
equation "mx+b", where x is the size of the original string.  By
computing 'm' and 'b' once, Perl can allocate enough memory to hold the
transformation, but not too much.  (m and b are adjusted up as necessary
as more strings get transformed.)  This minimizes mallocs.

But the calculation of m and b is somewhat expensive, and only necessary
if the program actually does a string compare under 'use locale'.

This commit defers the calculation until needed.  It does the bare
minimum of changes accomplish this.  The next commit will rearrange
things.


  Commit: 64730824c9d94bd7e51a2d64875b790f9c691bd8
      https://github.com/Perl/perl5/commit/64730824c9d94bd7e51a2d64875b790f9c691bd8
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Move code, white-space, comment only

This moves the function created in the previous commit to a more logical
place in the file; just before its only call.  It also removes nested
blocks that are no longer necessary.


  Commit: 6f5b4a0135f46661d415bb1898e9b52fd0a6a107
      https://github.com/Perl/perl5/commit/6f5b4a0135f46661d415bb1898e9b52fd0a6a107
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M lib/locale_threads.t
    M locale.c

  Log Message:
  -----------
  f


  Commit: e81815ec5e29b0db46f63df5a39634d953dcb96d
      https://github.com/Perl/perl5/commit/e81815ec5e29b0db46f63df5a39634d953dcb96d
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M ext/XS-APItest/t/locale.t

  Log Message:
  -----------
  APItest/t/locale.t: Add missing SKIP: label


  Commit: fcb47d11a94157eaa2cf86cb7ec416e9b09c63fe
      https://github.com/Perl/perl5/commit/fcb47d11a94157eaa2cf86cb7ec416e9b09c63fe
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M ext/XS-APItest/t/locale.t

  Log Message:
  -----------
  APItest/t/locale.t: Fix tests

This was misleadingly outputting an undef value, instead of just saying
it's undef


  Commit: 60995852750784dba17e69c9566efdbdd6f49f64
      https://github.com/Perl/perl5/commit/60995852750784dba17e69c9566efdbdd6f49f64
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M embed.fnc
    M ext/XS-APItest/t/locale.t
    M lib/locale.t
    M lib/locale_threads.t
    M locale.c
    M proto.h

  Log Message:
  -----------
  f


  Commit: 7c651860c274f4eeffc97fc7d8b560f05ff36b7e
      https://github.com/Perl/perl5/commit/7c651860c274f4eeffc97fc7d8b560f05ff36b7e
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M lib/locale_threads.t
    M locale.c

  Log Message:
  -----------
  f


  Commit: 4d21b273ba8a35998e828a9a5fba09c49a0329c1
      https://github.com/Perl/perl5/commit/4d21b273ba8a35998e828a9a5fba09c49a0329c1
  Author: Karl Williamson <khw@cpan.org>
  Date:   2021-03-31 (Wed, 31 Mar 2021)

  Changed paths:
    M lib/locale.t
    M lib/locale_threads.t
    M locale.c

  Log Message:
  -----------
  yet more


Compare: https://github.com/Perl/perl5/compare/4ca8eefc0550...4d21b273ba8a



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