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  1. MariaDB Server
  2. MDEV-7677

my_charset_handler_filename has a wrong "ismbchar" member

        Details

        • Type: Bug
        • Status: Closed
        • Priority: Major
        • Resolution: Fixed
        • Affects Version/s: 10.1
        • Fix Version/s: 10.1.4
        • Component/s: Character Sets
        • Labels:
          None

          Description

          In this definition in ctype-utf8.c:

          static MY_CHARSET_HANDLER my_charset_filename_handler=
{
    NULL,               /* init */
    my_ismbchar_utf8,
    my_mbcharlen_utf8,  /* TODO: this is wrong */
    ...
};

          using utf8 functions for "filename" looks wrong.
          It must have its own functions.
          This bug is about ismbchar() which has a simple repeatable SQL script.
          The problem with mbcharlen() is reported separately in MDEV-7819.

          Prove:

          SET NAMES utf8;
SELECT @a:=CONVERT('aя' USING filename) AS `@a`, binary @a, reverse(@a), hex(@a), hex(reverse(@a));

          returns:

          +-----+-----------+-------------+----------+------------------+
| @a  | binary @a | reverse(@a) | hex(@a)  | hex(reverse(@a)) |
+-----+-----------+-------------+----------+------------------+
| aя  | a@r1      | 1r?a        | 61407231 | 31724061         |
+-----+-----------+-------------+----------+------------------+

          This is wrong. The expected result should be:
          'яa' for `reverse(@a)`
          '40723161' for `hex(reverse(@a))`.

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                  • Assignee:
                    bar Alexander Barkov
                    Reporter:
                    bar Alexander Barkov
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                    Dates

                    • Created:
                      Updated:
                      Resolved: