[newlib-cygwin] Fix stdio exit handling

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=e826fbb2ae884257479165476acbc8d8be7d0081

commit e826fbb2ae884257479165476acbc8d8be7d0081
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Tue May 17 11:52:24 2022 +0200

    Fix stdio exit handling
    
    Make sure that the stdio exit handler is set in all stdio initialization paths.
    
    The bug was introduced by commit 26747c47bc0a1137e02e0377306d721cc3478855.

Diff:
---
 newlib/libc/stdio/findfp.c | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/newlib/libc/stdio/findfp.c b/newlib/libc/stdio/findfp.c
index 19952d4e0..118637a18 100644
--- a/newlib/libc/stdio/findfp.c
+++ b/newlib/libc/stdio/findfp.c
@@ -168,6 +168,19 @@ stdio_exit_handler (void)
   (void) _fwalk_sglue (_GLOBAL_REENT, CLEANUP_FILE, &__sglue);
 }
 
+static void
+global_stdio_init (void)
+{
+  if (__stdio_exit_handler == NULL) {
+    __stdio_exit_handler = stdio_exit_handler;
+#ifdef _REENT_GLOBAL_STDIO_STREAMS
+    stdin_init (&__sf[0]);
+    stdout_init (&__sf[1]);
+    stderr_init (&__sf[2]);
+#endif
+  }
+}
+
 /*
  * Find a free FILE for fopen et al.
  */
@@ -180,11 +193,7 @@ __sfp (struct _reent *d)
   struct _glue *g;
 
   _newlib_sfp_lock_start ();
-
-  if (__stdio_exit_handler == NULL) {
-    __sinit (_GLOBAL_REENT);
-    __stdio_exit_handler = stdio_exit_handler;
-  }
+  global_stdio_init ();
 
   for (g = &__sglue;; g = g->_next)
     {
@@ -273,13 +282,9 @@ __sinit (struct _reent *s)
 # endif /* _REENT_GLOBAL_STDIO_STREAMS */
 #endif
 
-#ifdef _REENT_GLOBAL_STDIO_STREAMS
-  if (__sf[0]._cookie == NULL) {
-    stdin_init (&__sf[0]);
-    stdout_init (&__sf[1]);
-    stderr_init (&__sf[2]);
-  }
-#else /* _REENT_GLOBAL_STDIO_STREAMS */
+  global_stdio_init ();
+
+#ifndef _REENT_GLOBAL_STDIO_STREAMS
   stdin_init (s->_stdin);
   stdout_init (s->_stdout);
   stderr_init (s->_stderr);