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uc_width and wcwidth optimization

From: Alexander V. Lukyanov
Subject: uc_width and wcwidth optimization
Date: Fri, 9 Dec 2011 11:55:48 +0400
User-agent: Mutt/1.5.21 (2010-09-15)


Attached is the patch to optimize performance of wcwith, uc_width and
uc{8,16,32}_width functions.

The optimization is caching of is_cjk_encoding() and using
nl_langinfo(CODESET) before the complex locale_charset() to check if the
charset has changed.

Besides, uc_width is used in wcwidth for cjk encodings as designed.


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