[zzo38computer]

Sometimes setjmp is useful and I had occasionally used it, but usually it is not needed. There is certain considerations you must make in order to be careful when you are using setjmp though.

(Free Hero Mesh uses setjmp in the execute_turn function. This function will call several other functions some of which are recursive, and sometimes an error occurs or WinLevel or LoseLevel occurs (even though these aren't errors), in which case it will have to return immediately. I did try to ensure that this use will not result in memory leaks or other problems; e.g. v_set_popup allocates a string and will not call longjmp while the string is allocated, until it has been assigned to a global variable (in which case the cleanup functions will handle this). Furthermore, the error messages are always static, so it is not necessary to handle the memory management of that either.)