[newlib-cygwin] Add _REENT_STDIN(ptr)

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=627a5cb4133ece2a80dbca27c403d4ceb3139130

commit 627a5cb4133ece2a80dbca27c403d4ceb3139130
Author: Matt Joyce <matthew.joyce@embedded-brains.de>
Date:   Fri Jan 28 10:58:36 2022 +0100

    Add _REENT_STDIN(ptr)
    
    Add a _REENT_STDIN() macro to encapsulate access to the _stdin
    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/stdio.h     | 4 ++--
 newlib/libc/include/sys/reent.h | 1 +
 newlib/libc/include/wchar.h     | 4 ++--
 newlib/libc/machine/spu/stdio.c | 4 ++--
 newlib/libc/stdio/findfp.c      | 4 ++--
 5 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/newlib/libc/include/stdio.h b/newlib/libc/include/stdio.h
index b995b56d2..c802b3737 100644
--- a/newlib/libc/include/stdio.h
+++ b/newlib/libc/include/stdio.h
@@ -167,11 +167,11 @@ typedef _ssize_t ssize_t;
 
 #define	TMP_MAX		26
 
-#define	stdin	(_REENT->_stdin)
+#define	stdin	_REENT_STDIN(_REENT)
 #define	stdout	(_REENT->_stdout)
 #define	stderr	(_REENT->_stderr)
 
-#define _stdin_r(x)	((x)->_stdin)
+#define _stdin_r(x)	_REENT_STDIN(x)
 #define _stdout_r(x)	((x)->_stdout)
 #define _stderr_r(x)	((x)->_stderr)
 
diff --git a/newlib/libc/include/sys/reent.h b/newlib/libc/include/sys/reent.h
index 70a987100..801fe20f4 100644
--- a/newlib/libc/include/sys/reent.h
+++ b/newlib/libc/include/sys/reent.h
@@ -720,6 +720,7 @@ struct _reent
 
 #define _REENT_EMERGENCY(_ptr)	((_ptr)->_emergency)
 #define _REENT_ERRNO(_ptr)	((_ptr)->_errno)
+#define _REENT_STDIN(_ptr)	((_ptr)->_stdin)
 
 #define _REENT_INIT_PTR(var) \
   { memset((var), 0, sizeof(*(var))); \
diff --git a/newlib/libc/include/wchar.h b/newlib/libc/include/wchar.h
index 0d3e636f9..5e9202820 100644
--- a/newlib/libc/include/wchar.h
+++ b/newlib/libc/include/wchar.h
@@ -320,13 +320,13 @@ int	_wscanf_r (struct _reent *, const wchar_t *, ...);
 
 #define getwc(fp)	fgetwc(fp)
 #define putwc(wc,fp)	fputwc((wc), (fp))
-#define getwchar()	fgetwc(_REENT->_stdin)
+#define getwchar()	fgetwc(_REENT_STDIN(_REENT))
 #define putwchar(wc)	fputwc((wc), _REENT->_stdout)
 
 #if __GNU_VISIBLE
 #define getwc_unlocked(fp)	fgetwc_unlocked(fp)
 #define putwc_unlocked(wc,fp)	fputwc_unlocked((wc), (fp))
-#define getwchar_unlocked()	fgetwc_unlocked(_REENT->_stdin)
+#define getwchar_unlocked()	fgetwc_unlocked(_REENT_STDIN(_REENT))
 #define putwchar_unlocked(wc)	fputwc_unlocked((wc), _REENT->_stdout)
 #endif
 
diff --git a/newlib/libc/machine/spu/stdio.c b/newlib/libc/machine/spu/stdio.c
index 1dcc88b60..756628303 100644
--- a/newlib/libc/machine/spu/stdio.c
+++ b/newlib/libc/machine/spu/stdio.c
@@ -67,8 +67,8 @@ __sinit (struct _reent *s)
 {
   s->__cleanup = __cleanup;
 
-  s->_stdin = &s->__sf[0];
-  s->_stdin->_fp = SPE_STDIN;
+  _REENT_STDIN(s) = &s->__sf[0];
+  _REENT_STDIN(s)->_fp = SPE_STDIN;
 
   s->_stdout = &s->__sf[1];
   s->_stdout->_fp = SPE_STDOUT;
diff --git a/newlib/libc/stdio/findfp.c b/newlib/libc/stdio/findfp.c
index c7a4a941e..d2292d3e0 100644
--- a/newlib/libc/stdio/findfp.c
+++ b/newlib/libc/stdio/findfp.c
@@ -218,8 +218,8 @@ found:
 static void
 cleanup_stdio (struct _reent *ptr)
 {
-  if (ptr->_stdin != &__sf[0])
-    CLEANUP_FILE (ptr, ptr->_stdin);
+  if (_REENT_STDIN(ptr) != &__sf[0])
+    CLEANUP_FILE (ptr, _REENT_STDIN(ptr));
   if (ptr->_stdout != &__sf[1])
     CLEANUP_FILE (ptr, ptr->_stdout);
   if (ptr->_stderr != &__sf[2])