[newlib-cygwin] Add _REENT_CVTBUF(ptr)

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=81352a9df9d7c8ce9f9dc63126e4cfbd8ff4a082

commit 81352a9df9d7c8ce9f9dc63126e4cfbd8ff4a082
Author: Matt Joyce <matthew.joyce@embedded-brains.de>
Date:   Thu Feb 3 12:24:26 2022 +0100

    Add _REENT_CVTBUF(ptr)
    
    Add a _REENT_CVTBUF() macro to encapsulate access to the _cvtbuf
    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/reent/reent.c       |  4 ++--
 newlib/libc/stdlib/ecvtbuf.c    | 12 ++++++------
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/newlib/libc/include/sys/reent.h b/newlib/libc/include/sys/reent.h
index 8c88fae20..ef05dd8c9 100644
--- a/newlib/libc/include/sys/reent.h
+++ b/newlib/libc/include/sys/reent.h
@@ -719,6 +719,7 @@ struct _reent
 #endif /* !_REENT_SMALL */
 
 #define _REENT_CLEANUP(_ptr)	((_ptr)->__cleanup)
+#define _REENT_CVTBUF(_ptr)	((_ptr)->_cvtbuf)
 #define _REENT_CVTLEN(_ptr)	((_ptr)->_cvtlen)
 #define _REENT_EMERGENCY(_ptr)	((_ptr)->_emergency)
 #define _REENT_ERRNO(_ptr)	((_ptr)->_errno)
diff --git a/newlib/libc/reent/reent.c b/newlib/libc/reent/reent.c
index 16ac04e22..2cfec5363 100644
--- a/newlib/libc/reent/reent.c
+++ b/newlib/libc/reent/reent.c
@@ -78,8 +78,8 @@ _reclaim_reent (struct _reent *ptr)
 	_free_r (ptr, ptr->_misc);
 #endif
 
-      if (ptr->_cvtbuf)
-	_free_r (ptr, ptr->_cvtbuf);
+      if (_REENT_CVTBUF(ptr))
+	_free_r (ptr, _REENT_CVTBUF(ptr));
     /* We should free _sig_func to avoid a memory leak, but how to
 	   do it safely considering that a signal may be delivered immediately
 	   after the free?
diff --git a/newlib/libc/stdlib/ecvtbuf.c b/newlib/libc/stdlib/ecvtbuf.c
index 0e776ab65..05f315108 100644
--- a/newlib/libc/stdlib/ecvtbuf.c
+++ b/newlib/libc/stdlib/ecvtbuf.c
@@ -232,14 +232,14 @@ fcvtbuf (double invalue,
     {
       if (_REENT_CVTLEN(reent) <= ndigit + 35)
 	{
-	  if ((fcvt_buf = (char *) _realloc_r (reent, reent->_cvtbuf,
+	  if ((fcvt_buf = (char *) _realloc_r (reent, _REENT_CVTBUF(reent),
 					       ndigit + 36)) == NULL)
 	    return NULL;
 	  _REENT_CVTLEN(reent) = ndigit + 36;
-	  reent->_cvtbuf = fcvt_buf;
+	  _REENT_CVTBUF(reent) = fcvt_buf;
 	}
 
-      fcvt_buf = reent->_cvtbuf ;
+      fcvt_buf = _REENT_CVTBUF(reent) ;
     }
 
   save = fcvt_buf;
@@ -281,14 +281,14 @@ ecvtbuf (double invalue,
     {
       if (_REENT_CVTLEN(reent) <= ndigit)
 	{
-	  if ((fcvt_buf = (char *) _realloc_r (reent, reent->_cvtbuf,
+	  if ((fcvt_buf = (char *) _realloc_r (reent, _REENT_CVTBUF(reent),
 					       ndigit + 1)) == NULL)
 	    return NULL;
 	  _REENT_CVTLEN(reent) = ndigit + 1;
-	  reent->_cvtbuf = fcvt_buf;
+	  _REENT_CVTBUF(reent) = fcvt_buf;
 	}
 
-      fcvt_buf = reent->_cvtbuf ;
+      fcvt_buf = _REENT_CVTBUF(reent) ;
     }
 
   save = fcvt_buf;