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> If you call isxxx() with a signed char then the result is undefined.  In
> particular the function is often defines as (__ctype[1 + arg] & BIT_PATTERN)
> so a negative value in a signed char will index off the front of the array
> as look in an incorrect place for the bit-pattern.  It might even core dump.

updated, along with other fixes / improvements. Thanks a lot for this 
clear explaination :)

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iMil <imil@home.imil.net>                                                 _
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