testing for corruption

[Scott Nelson]

We had a file get corrupted while changing the map, even though all the 
keys were restructured successfully.  The suspected culprit is a posting 
report that is a cron job, but we are still looking into it.   To assist 
in repairing the fields affected, I want to test each record and the 
fields by detecting the garbage graphic characters that appear in the 
fields.  I seem to remember that this can be done with ascii or chr 
codes and a range to see if the values are not 0-9 or a-z. 

Thanks,

Scott