setjmp(), register vars and the proposed standard

[peterg at tekecs.UUCP]

This is how the library subsection of the proposed ANSI standard
reads for setjmp()/longjmp():

> All accessible objects have value as of the time longjmp was called,
> except for objects of storage class auto or register whose values
> have been changed between the setjmp and longjmp calls. These values
> are undefined.

Given that many processors don't automatically push any kind of register
mask on the stack (as VAXen do) this seems like a 'safe and sane' approach.


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