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Temporarily aliasing a function

tailsnaf

Hi,

 I'm wondering if the following is possible in skill - 

Say I have an existing skill library that I don't have edit access to. This library calls a procedure as part of a higher-level routine.

What I would like to do is intercept this call to the procedure, and insert my own 'wrapper' and then call the procedure.

So for example - the current setup is:  

top_proc -> calls sub_proc 

 

I want 'alias' sub_proc, so it is called sub_proc_orig, and then define my own procedure called sub_proc.

sub_proc will 'do some work' and then pass on the call to sub_proc_orig, so the call-chain would now be:

top_proc -> calls sub_proc (my proc) -> calls sub_proc_orig (original proc) 

 

Is this possible by using the 'address/id' of the existing sub_proc perhaps? 

  • putd('sub_proc_orig getd('sub_proc))
    ; allow redefinition of write protected functions - only needed if it's write protected
    sstatus(debugMode t)
    procedure(sub_proc(correct args for sub_proc)
      ...
      sub_proc_orig(...)
    )

    Do this carefully though - if it gets forgotten that the function is being overloaded this way, it can make it very confusing to the poor soul trying to debug why the original function doesn't behave the same way that they're expecting...

    Regards,

    Andrew.

  • This is excellent Andrew, thanks. I will proceed with caution - I plan on passing directly through by default, and only in the advanced mode doing some pre-processing first.

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