Behaviour of setjmp/longjmp and registers

[Doug Gwyn]

In article <501 at maxim.ERBE.SE> prc at maxim.ERBE.SE (Robert Claeson) writes:
-In article <7644 at chinet.chi.il.us>, les at chinet.chi.il.us (Leslie Mikesell) writes:
-> It must be fun to run vi/emacs/ksh/etc. on a keyboard that has not
-> ESC key.
-Sort of. All keyboards  that I know of that lacks an ESC key has another
-key as a substitute. For  example, on the VT220 keyboard, one can use
-ctrl-3 or ctrl-[.

I don't know about ctrl-3, but ctrl-[ almost certainly transmits the
ASCII ESC code, so it amounts to an ESC key.  That brings one right
back to the original problem, of distinguishing between legitimate
escape sequences and human-typed garbage.