>...
>    Feeding a routine in libc a perfectly valid int should NOT cause the
>    libc routine to segfault.  That is Bad.
>
>Sugested fix:
>
>Add this c-equivalent line to   isalpha(c):
>
>  if( c < 0 || c > 0xff)return 0;  // Cannot be alphabetic
>  // this  "if" could  also be nicely encoded as a bit test against 0xffffff00
>
>  // Else, array bound is OK, index into our 256-byte array
>...

does this rudely prohibit unicode characters from being examined and
classified?

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