> setjmp / longjmp is being used to short-circuit the return of a > recursive r-tree search call, so is required. It can just be a little > mind-bendy to get your head around the execution flow, and potential > side-effects (which is what bit me). > > The linux man page has this to say: > > "setjmp() and sigsetjmp() make programs hard to understand and maintain. > If possible an alternative should be used." > > Well, I think in PCB at least some of their use is quite justified, even > if in places it is a nightmare to follow the execution flow. > Fortunately, the "worst" use of these functions is contained in the > polygon handling routines, and IIRC for error trapping / shortcut > returns in the DRC code. > OK - but to help those who follow in your keystrokes, copy your first sentence as a comment in the code at setjmp() and the line that calls the jump. Sometimes a gun is just the tool you need... ;)
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