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-rw-r--r--libio/ftello64.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/libio/ftello64.c b/libio/ftello64.c
index 621454974e..7cb75626cf 100644
--- a/libio/ftello64.c
+++ b/libio/ftello64.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 95, 96, 97, 98, 99 Free Software Foundation, Inc.
    This file is part of the GNU IO Library.
 
    This library is free software; you can redistribute it and/or
@@ -33,13 +33,18 @@ ftello64 (fp)
      _IO_FILE *fp;
 {
 #ifdef _G_LSEEK64
-  _IO_pos_t pos;
+  _IO_off64_t pos;
   CHECK_FILE (fp, -1L);
   _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
   _IO_flockfile (fp);
   pos = _IO_seekoff (fp, 0, _IO_seek_cur, 0);
   if (_IO_in_backup (fp))
-    pos -= fp->_IO_save_end - fp->_IO_save_base;
+    {
+      if (fp->_mode <= 0)
+	pos -= fp->_IO_save_end - fp->_IO_save_base;
+      else
+	abort ();
+    }
   _IO_funlockfile (fp);
   _IO_cleanup_region_end (0);
   if (pos == _IO_pos_BAD)
@@ -50,7 +55,7 @@ ftello64 (fp)
 #endif
       return -1L;
     }
-  return _IO_pos_as_off (pos);
+  return pos;
 #else
   __set_errno (ENOSYS);
   return -1;