David.Slonosky@QueensU.CA (08/01/90)
I'm trying to write some C code for checking the protection bits on a file as
to whether it has been set for deleteable or not. Rob Peck's "Programmer's
Guide to the Amiga" has a good example on pp.31-32 of how to do this, but
unfortunately doesn't go into the reason as to why the code was set up that
way. Specifically, he uses a set of masks with the structure:
long rmask = ((long)('r') << 24);
long bramsk = ((long)(' ') << 24);
and so on, then tests them versus the fib_Protection flag of the file
information block structure he obtains. The problem is that a few more flags
have been added since then, and I don't see where he gets the "24" from for
his masking variables. I have the RKM dealing with Libraries and Devices,
but there is nothing I can find in it for dealing with the file info I want to
obtain. Any hints on references for this, or even personal hints, will be
greatly appreciated.
Please respond by E-mail, as I don't subscribe to this list.
Dave