libio: Use stdin consistently for input functions [BZ #24153]

The internal _IO_stdin_ variable is not updated when the application
assigns to stdin, which is a GNU extension.

1 files changed, 8 insertions, 8 deletions

diff --git a/debug/gets_chk.c b/debug/gets_chk.c
index 4b5e13d..fc6557a 100644
--- a/debug/gets_chk.c
+++ b/debug/gets_chk.c
@@ -37,8 +37,8 @@ __gets_chk (char *buf, size_t size)
   if (size == 0)
     __chk_fail ();
 
-  _IO_acquire_lock (_IO_stdin);
-  ch = _IO_getc_unlocked (_IO_stdin);
+  _IO_acquire_lock (stdin);
+  ch = _IO_getc_unlocked (stdin);
   if (ch == EOF)
     {
       retval = NULL;
@@ -51,24 +51,24 @@ __gets_chk (char *buf, size_t size)
       /* This is very tricky since a file descriptor may be in the
 	 non-blocking mode. The error flag doesn't mean much in this
 	 case. We return an error only when there is a new error. */
-      int old_error = _IO_stdin->_flags & _IO_ERR_SEEN;
-      _IO_stdin->_flags &= ~_IO_ERR_SEEN;
+      int old_error = stdin->_flags & _IO_ERR_SEEN;
+      stdin->_flags &= ~_IO_ERR_SEEN;
       buf[0] = (char) ch;
-      count = _IO_getline (_IO_stdin, buf + 1, size - 1, '\n', 0) + 1;
-      if (_IO_stdin->_flags & _IO_ERR_SEEN)
+      count = _IO_getline (stdin, buf + 1, size - 1, '\n', 0) + 1;
+      if (stdin->_flags & _IO_ERR_SEEN)
 	{
 	  retval = NULL;
 	  goto unlock_return;
 	}
       else
-	_IO_stdin->_flags |= old_error;
+	stdin->_flags |= old_error;
     }
   if (count >= size)
     __chk_fail ();
   buf[count] = 0;
   retval = buf;
 unlock_return:
-  _IO_release_lock (_IO_stdin);
+  _IO_release_lock (stdin);
   return retval;
 }