[Bug locale/20568] Segfault with wide characters and setlocale/fgetwc/UTF-8

["schwab at linux-m68k dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20568

--- Comment #9 from Andreas Schwab <schwab@linux-m68k.org> ---
That should fix it:

diff --git a/libio/wfileops.c b/libio/wfileops.c
index 5bc785b2b6..b30ef81813 100644
--- a/libio/wfileops.c
+++ b/libio/wfileops.c
@@ -508,11 +508,11 @@ _IO_wfile_sync (FILE *fp)
             generate the wide characters up to the current reading
             position.  */
          int nread;
-
+         size_t wnread = fp->_wide_data->_IO_read_ptr -
fp->_wide_data->_IO_read_base;
          fp->_wide_data->_IO_state = fp->_wide_data->_IO_last_state;
          nread = (*cv->__codecvt_do_length) (cv, &fp->_wide_data->_IO_state,
                                              fp->_IO_read_base,
-                                             fp->_IO_read_end, delta);
+                                             fp->_IO_read_end, wnread);
          fp->_IO_read_ptr = fp->_IO_read_base + nread;
          delta = -(fp->_IO_read_end - fp->_IO_read_base - nread);
        }

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