On Apr 19, 2014, at 11:58 AM, Ateeth Kumar Thirukkovulur
<athirukkovu...@uh.edu> wrote:
> Not exactly.
>
> Suppose I want to include a NOT operator in the display filter. Say "! tcp".
> Which code must I change? I know it already exists. Where do I include the
> symbols n expressions for newly added terms.
>
> Do you get what I am saying?
No, not really.
If you mean "how do I support new operators in packet-matching expressions",
you'd:
change epan/dfilter/scanner.l to add the new operator as a
lexical-analyzer token;
change epan/dfilter/grammar.lemon to handle that token as part of the
grammar, translating them into new "instructions" in the "display filter
virtual machine";
change epan/dfilter/dfvm.c to support those new "instructions".
If you mean "how do I support some particular *type* of new operators", you'd
need to tell us what those new operators are and what semantics they have, so
we can indicate what *particular* changes would be needed to those files.
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