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int (*add)(CHARSET_INFO *cs));
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extern char *my_strchr(CHARSET_INFO *cs, const char *str, const char *end,
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extern size_t my_strcspn(CHARSET_INFO *cs, const char *str, const char *end,
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my_bool my_propagate_simple(CHARSET_INFO *cs, const uchar *str, size_t len);
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my_bool my_propagate_complex(CHARSET_INFO *cs, const uchar *str, size_t len);