Well, well, well. How helpful are the OpenBSD community? Very, in my mind.
Thanks to the advice from here, I've now decided that I'll start the ball rolling with: Programming in C Kochan ISBN: 0672326663 to get me started. I'm a bit blown away by all the hugely positive reviews of this book, at Amazon. This will be followed by, or ordered at the same time as: The C Programming Language (2nd Edition) K&R ISBN: 0131103628 as I'd plainly be a fool not to. Praise be. And at a later date, once it's warranted, I'll add: Advanced Programming in the UNIX Environment Stevens & Rago ISBN: 0201433079 which again has some excellent reviews and I'm already impressed with Stevens' work, from TCP/IP Illustrated Vol.1. How could I not be? Many thanks for the advice, it's greatly appreciated. All the best, Craig