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(mysql.info)Multi-byte characters

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Multi-byte Character Support
----------------------------

If your want to add support for a new character set that includes
multi-byte characters, you need to use the multi-byte character
functions.

Right now the best documentation on this is the character sets that are
already implemented.  Look at the euc_kr, gb2312, gbk, sjis and ujis
character sets for examples. These are implemented in the
`ctype-'charset'.c' files in the `strings' directory.

You must specify the `mbmaxlen_MYSET=N' value in the special comment at
the top of the source file.  `N' should be set to the size in bytes of
the largest character in the set.