1 files changed, 54 insertions, 0 deletions
diff --git a/contrib/libio/ioseekoff.c b/contrib/libio/ioseekoff.c
new file mode 100644
index 000000000000..b1c4729b3d1d
--- /dev/null
+++ b/contrib/libio/ioseekoff.c
@@ -0,0 +1,54 @@
+/* Copyright (C) 1993, 1997 Free Software Foundation, Inc.
+   This file is part of the GNU IO Library.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This library is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this library; see the file COPYING.  If not, write to
+   the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+
+   As a special exception, if you link this library with files
+   compiled with a GNU compiler to produce an executable, this does
+   not cause the resulting executable to be covered by the GNU General
+   Public License.  This exception does not however invalidate any
+   other reasons why the executable file might be covered by the GNU
+   General Public License.  */
+
+#include <libioP.h>
+
+_IO_pos_t
+_IO_seekoff (fp, offset, dir, mode)
+     _IO_FILE *fp;
+     _IO_off_t offset;
+     int dir;
+     int mode;
+{
+  _IO_pos_t retval;
+
+  /* If we have a backup buffer, get rid of it, since the __seekoff
+     callback may not know to do the right thing about it.
+     This may be over-kill, but it'll do for now. TODO */
+  _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
+  _IO_flockfile (fp);
+
+
+  if (_IO_have_backup (fp))
+    {
+      if (dir == _IO_seek_cur && _IO_in_backup (fp))
+	offset -= fp->_IO_read_end - fp->_IO_read_ptr;
+      _IO_free_backup_area (fp);
+    }
+  retval = _IO_SEEKOFF (fp, offset, dir, mode);
+
+  _IO_cleanup_region_end (1);
+  return retval;
+}