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MySQL 5.7 Reference Manual  /  ...  /  Multi-Byte Character Support for Complex Character Sets

11.3.3 Multi-Byte Character Support for Complex Character Sets

If you want to add support for a new character set named MYSET that includes multibyte characters, you must use multibyte character functions in the ctype-MYSET.c source file in the strings directory.

The existing character sets provide the best documentation and examples to show how these functions are implemented. Look at the ctype-*.c files in the strings directory, such as the files for the euc_kr, gb2312, gbk, sjis, and ujis character sets. Take a look at the MY_CHARSET_HANDLER structures to see how they are used. See also the CHARSET_INFO.txt file in the strings directory for additional information.

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