If the reported terminal width is 0 or less than 42, the signed variable
width was set to a negative number that was then assigned to the
unsigned column width becoming a huge number.
Add comments and change logic to better explain what's happening.
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Philip Pokorny <ppokorny@mindspring.com>
Closes#10247
a36bad1759