-=> On 06 Apr 96  14:31:08 Peter Collis replied to John Gardeniers <=-

        Hello Peter,

 JG> All constructive criticism, sugestions  and comments are
 JG> welcome. Insults are best kept to yourself.

 JG> #define NULL  0

 PC> Shouldn't NULL be defined for you in a header file somewhere.? I'm not
 PC> sure what compiler your using so maybe not.

        I use PCC and to keep the speed up, as much as practical (I use an
XT to do my programming), I avoid header files.  PCC is quite different to
other compilers in as much as prototyping is rarely needed and almost
everything that's a standard macro on another compiler is a function with
PCC.

 JG> #define TRUE  0
 JG> #define FALSE !TRUE
 PC> ~~~   ^^^^^^^^^^^^^^^^^^
 PC> I think defining FALSE to a non-zero value would be a bad habit to get
 PC> into, it would be better to always assume FALSE to be zero.

        One thing in favour of having TRUE=0 is that on a no error
completion of a function you can simply "fall through" at the end, i.e.  no
explicit RETURN.  I personally like using non-zero far FALSE as it allows
me to test for FALSE and then act acording to what value was actually
returned, much like DOS error levels.

        From your other reply:

 JG> Next project: How to do a move without a copy if the
 JG> destination is the same drive as the source.  That would save quite a
 JG> bit of time with large files. Any thoughts?

 PC> Quite simple use the rename() function, see info below.

        This was actually the very first thing I tried.  Both DOS (command
line) and PCC failed to move the file, so I started searching for another
way.  On reading your reply I tried again with the same results.  I then
tried going straight to DOS, using assembler and AH=56H INT 21H...Bingo!

        I hope you feel good about me throwing away a couple of days of
work, tracing directory entries, FATs, etc.  .  At least my code can
now shrink by about 4 or 5 Kb and I now know a lot more about how
everything on a disk is organised.

        Thank for you comments, as well as getting me back on the right
track with the file move.

                John

... Now my tagline manager won't work!
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