Find and correct inadequate input validation

[GoogleCodeExporter]

There are instances where malformed input causes some apps to crash.  E.g., 
when an incorrect delimiter was specified or a line of input doesn't 
contain as many fields as expected.  At the very least, the apps should 
`exit(EXIT_FAILURE)` instead of seg-faulting.

Original issue reported on code.google.com by jeremy.h...@gmail.com on 18 Jul 2008 at 5:06