[newlib-cygwin/main] stdio: set and test stream orientation in low-level input function __srget_r

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=c190063f9658153988d735a333a7a3c7aeadc001

commit c190063f9658153988d735a333a7a3c7aeadc001
Author:     Corinna Vinschen <corinna@vinschen.de>
AuthorDate: Mon Nov 20 20:47:52 2023 +0100
Commit:     Corinna Vinschen <corinna@vinschen.de>
CommitDate: Mon Nov 20 20:59:13 2023 +0100

    stdio: set and test stream orientation in low-level input function __srget_r
    
    This allows to set and test orientation correctly if input is only
    using macros from stdio.h.  Wide-char-oriented functions must call
    __srefill_r directly.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 newlib/libc/stdio/rget.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/newlib/libc/stdio/rget.c b/newlib/libc/stdio/rget.c
index a9a0d2f2f246..38e8b5dd1959 100644
--- a/newlib/libc/stdio/rget.c
+++ b/newlib/libc/stdio/rget.c
@@ -39,6 +39,11 @@ __srget_r (struct _reent *ptr,
      we call __srefill_r so we may access the true read buffer. */
   CHECK_INIT(ptr, fp);
 
+  /* Have to set and check orientation here, otherwise the macros in
+     stdio.h never set it. */
+  if (ORIENT (fp, -1) != -1)
+    return EOF;
+
   if (__srefill_r (ptr, fp) == 0)
     {
       fp->_r--;