Andrew Brown writes:

> >...
> >    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?

iswalpha() is the equivalent interface for wide characters.

Cheers,

Dave