Correct me if I am wrong but as far as I know the issue you mention only
affects tolower(), toupper() and is* functions that operate on letters.
Functions such as isspace() are safe since their limited character set only
covers a very limited range of characters that are not affected by the
behavior you've described.
Nope. Regardless of the range the function covers, it may return an unwanted
value because the function is likely backed by a simple vector and a negative
argument may make it refer to a point out of the valid address space.
Moriyoshi
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