[bug-diffutils] bug#22816: bug#22816: cmp --verbose EOF message could be more verbose

[Paul Eggert]

On 05/04/2017 10:28 AM, Jim Meyering wrote:
> Making cmp perform that task does not seem worthwhile, because one
> would have to choose between always counting newlines (like wc -l
> does), and thus incurring this added cost all the time, or accepting a
> partial (and racy) solution of rereading the regular file upon EOF.

There's a third way, that satisfies Dan Jacobson's request in the usual 
case, without incurring added cost. Proposed patch attached, with a 
simple test for 'cmp' (which is a good thing to have in any event).

0001-cmp-report-prefix-length-when-one-file-is-shorter.patch
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