ls: print "?", not "0" as inode of dereferenced dangling symlink

ls prints inode numbers two ways: for long (-l) listings,
and for short ones, e.g., ls -li and ls -i.  The code to print
long listings properly printed "?" when the inode was unknown,
but the code for handling short listings would print 0 instead.
Factor out the formatting code into a new function so ls prints
the right string ("?") from both places:
* NEWS (Bug fixes): Mention it.
* src/ls.c (format_inode): New function.
(print_long_format): Use it here.
(print_file_name_and_frills): Use it here, too.
* tests/ls/dangle: Exercise this fix.
Reported by Yang Ren in http://bugzilla.redhat.com/525400

1 files changed, 3 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index d0a9a7d62..68ac24b10 100644
--- a/NEWS
+++ b/NEWS
@@ -18,6 +18,9 @@ GNU coreutils NEWS                                    -*- outline -*-
 
   ls -LR exits with status 2, not 0, when it encounters a cycle
 
+  ls -Li is now consistent with ls -Lil in printing "?", not "0" as the
+  inode of a dangling symlink.
+
 ** Portability
 
   On Solaris 9, many commands would mistakenly treat file/ the same as