* src/tar.c (NS_PRECISION_FORMAT_MASK): New macro.

(tar_timespec_cmp): New function. Wrapper over
timespec_cmp using the timespec precision provided by the
current archive format.
* src/common.h (tar_timespec_cmp): New declaration.
* src/compare.c (diff_file): Use tar_timespec_cmp.
* src/extract.c (file_newer_p): Likewise.
* src/update.c (update_archive): Likewise.
* tests/truncate.at: Reverted changes
* tests/update.at: Reverted changes

src/update.c

@@ -1,7 +1,7 @@
 /* Update a tar archive.
 
    Copyright (C) 1988, 1992, 1994, 1996, 1997, 1999, 2000, 2001, 2003,
-   2004 Free Software Foundation, Inc.
+   2004, 2005 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
@@ -138,8 +138,8 @@ update_archive (void)
 		chdir_do (name->change_dir);
 		if (deref_stat (dereference_option,
 				current_stat_info.file_name, &s) == 0
-		    && (timespec_cmp (get_stat_mtime (&s),
-				      current_stat_info.mtime)
+		    && (tar_timespec_cmp (get_stat_mtime (&s),
+				          current_stat_info.mtime)
 			<= 0))
 		  add_avoided_name (current_stat_info.file_name);
 	      }