🚀 go-pugleaf

Chris Croughton <chris@keris.demon.co.uk> wrote:
>I've rebuilt KA9Q 2.16d, but all it does is clear the screen and then
>lock up (CTRL-ALT-DEL works, but nothing else).  I rebuilt it using the
>makefile using BC++ 4.02 and maker
 [snip]

I'm using v4.01+patches (which I think makes it 4.02).  The problem is 
the C++ exception handling code which is linked in whether you need it 
or not (ever wondered why a Hello World was 40k ?).  I believe v4.5x 
gets round it with an alternate set of Dos libs without the exception 
handlers and a 'smarter' tlink.  See Borland's TechInfo ti1789 for 
their explanation and fix, it's still not quite enough for KA9Q ...

To fix it:

In main.c add a dummy function to prevent the exception fns being 
pulled in at link:

void	_ExceptInit ( void )
{
}

(You could add an #if wrapper to check for __BORLANDC__ >= 0x0450 &&
 <= 0x0452 - that is my best guess for the versions affected (I know 
 it looks like 4.5, what's 4.5x return, anybody ? ))

(That fix is needed for any Dos/C program compiled with BC4.0x, BTW)

The other problem is that the setjmp()/longjmp() functions, used to 
task-switch, also reference exception related functions.  The easiest 
way round this is to link KA9Q with BC4\LIB\COMPAT\setjmp.obj (it's a 
version without the exception calls, mentioned in BC4\DOC\compat.txt) 
- the alternative is to add another 3 dummy functions for which I've 
worked out the prototypes, if anyone's interested, but this would slow 
things down.

That should give you a working KA9Q (if you ignore all the warnings, I 
haven't found one that will cause any run-time problems).  A word of 
warning though, don't use the '!' shell-to-dos or whatever the z-modem 
receive command is which executes things since both spawn() and 
system() under BC4 reference a function that calls realloc() which 
leads to a nasty crash since KA9Q doesn't implement realloc.  There 
is a realloc function commented out in alloc.c but I'm not sure I like 
the look of it.

You don't actually need to compile around a third of the source files 
to build the DIS version.  I've come up with a replacement makefile 
which works on a re-organised source tree to easily manage different 
configs and can take advantage of some new features of the BC4 make 
(multiple directories for source & targets) - it currently looks like:

    src/              Source files
           doc/       Text files
           unused/    Unused source files

    large/            One directory for each configuration
           net.exe    Large build net.exe target
           config/    for large build config.h
           obj/       *.obj

(I presume maker acts the same way, don't think I've ever used it, I 
just use make with a swapfile set up - mail me if you want the 
details, the manuals/text files are IMHO ambiguous/conflicting/wrong 
as to what settings are required)

>Also, looking at the config files I notice that although SLIP is
>disabled the Van Jacobson TCP compression for SLIP is on.  Is there some
>arcane reason for this?

I've checked this before myself, it doesn't make any difference if 
SLIP is not defined.

Cheers,

      Graham.
-- 
----[ Graham E. Kinns ]----==============----< GEKinns@IEE.Org >----