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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: test char
Date: Sat, 29 Nov 2008 12:14:20 +0200
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> From: Xend <firperfect@gmail.com>
> Date: Fri, 28 Nov 2008 21:00:03 -0800 (PST)
> 
> are there Emacs function like Libc function isupper / isalpha???

It's all too easy to make one:

  (eq (downcase ch) ch)

Btw, why do you need such a function?  What do you need to do if these
functions return t?  Perhaps you could do whatever you need without
such a test?