compact char mapping (Re: CharClass code for XTerm)

[towo@xxxxxxxxxxxx]

Hi Markus,

in analogy to your compact char class function for word selection, 
is there such a compact function already available for toupper and 
tolower (and perhaps totitle) mapping? I've browsed the new glibc and 
it seems a large table is used there for that purpose.

Kind regards,
Thomas Wolff
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