>> > > >     Feeding a routine in libc a perfectly valid int should NOT
>> > > >     cause the libc routine to segfault.  That is Bad.
>
>> This is totally bogus argument. Please, show me an *invalid* int.
>
>Precisely!

feeding 135471234 to isalpha() and expecting a sensible result is like
feeding 135471234 to asin() and expecting a sensible result or like
calling fprintf() with NULL for the fp.  all those inputs are outside
the proscribed domains of the functions.  how a program handles that
is not defined by any standard.  it is up to the program to make sure
that it does not exceed the domain of a function, not the system.

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