[newlib-cygwin] Add _REENT_LOCALE(ptr)

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=50f078b48cea6664975b87cbacf2a7dfacb42fba

commit 50f078b48cea6664975b87cbacf2a7dfacb42fba
Author: Matt Joyce <matthew.joyce@embedded-brains.de>
Date:   Wed Feb 2 12:47:30 2022 +0100

    Add _REENT_LOCALE(ptr)
    
    Add a _REENT_LOCALE() macro to encapsulate access to the _locale
    member of struct reent. This will help to replace the struct
    member with a thread-local storage object in a follow up patch.

Diff:
---
 newlib/libc/include/sys/reent.h | 1 +
 newlib/libc/locale/setlocale.h  | 4 ++--
 newlib/libc/locale/uselocale.c  | 4 ++--
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/newlib/libc/include/sys/reent.h b/newlib/libc/include/sys/reent.h
index 2c1593a5f..4296188f5 100644
--- a/newlib/libc/include/sys/reent.h
+++ b/newlib/libc/include/sys/reent.h
@@ -721,6 +721,7 @@ struct _reent
 #define _REENT_EMERGENCY(_ptr)	((_ptr)->_emergency)
 #define _REENT_ERRNO(_ptr)	((_ptr)->_errno)
 #define _REENT_INC(_ptr)	((_ptr)->_inc)
+#define _REENT_LOCALE(_ptr)	((_ptr)->_locale)
 #define _REENT_STDIN(_ptr)	((_ptr)->_stdin)
 #define _REENT_STDOUT(_ptr)	((_ptr)->_stdout)
 #define _REENT_STDERR(_ptr)	((_ptr)->_stderr)
diff --git a/newlib/libc/locale/setlocale.h b/newlib/libc/locale/setlocale.h
index a0c80843a..9f7fd7c10 100644
--- a/newlib/libc/locale/setlocale.h
+++ b/newlib/libc/locale/setlocale.h
@@ -218,7 +218,7 @@ _ELIDABLE_INLINE struct __locale_t *
 __get_locale_r (struct _reent *r)
 {
 #ifdef __HAVE_LOCALE_INFO__
-  return r->_locale;
+  return _REENT_LOCALE(r);
 #else
   return __get_global_locale();
 #endif
@@ -232,7 +232,7 @@ _ELIDABLE_INLINE struct __locale_t *
 __get_current_locale (void)
 {
 #ifdef __HAVE_LOCALE_INFO__
-  return _REENT->_locale ?: __get_global_locale ();
+  return _REENT_LOCALE(_REENT) ?: __get_global_locale ();
 #else
   return __get_global_locale();
 #endif
diff --git a/newlib/libc/locale/uselocale.c b/newlib/libc/locale/uselocale.c
index 83ebcdd19..799fb724a 100644
--- a/newlib/libc/locale/uselocale.c
+++ b/newlib/libc/locale/uselocale.c
@@ -64,9 +64,9 @@ _uselocale_r (struct _reent *p, struct __locale_t *newloc)
   if (!current_locale)
     current_locale = LC_GLOBAL_LOCALE;
   if (newloc == LC_GLOBAL_LOCALE)
-    p->_locale = NULL;
+    _REENT_LOCALE(p) = NULL;
   else if (newloc)
-    p->_locale = newloc;
+    _REENT_LOCALE(p) = newloc;
   return current_locale;
 }