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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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