From: "n.pettik" <korablev@tarantool.org> To: tarantool-patches@freelists.org Cc: Ivan Koptelov <ivan.koptelov@tarantool.org> Subject: [tarantool-patches] Re: [PATCH] sql: LIKE/LENGTH process '\0' Date: Fri, 22 Feb 2019 15:59:35 +0300 [thread overview] Message-ID: <3377BC01-D943-4D24-A9A2-BA9B9C67EA92@tarantool.org> (raw) In-Reply-To: <583EC402-D1FF-45C4-B18B-8A06D4362200@tarantool.org> [-- Attachment #1: Type: text/plain, Size: 1660 bytes --] > On 20 Feb 2019, at 22:24, i.koptelov <ivan.koptelov@tarantool.org> wrote: > >>> >>> On 20 Feb 2019, at 18:47, i.koptelov <ivan.koptelov@tarantool.org <mailto:ivan.koptelov@tarantool.org>> wrote: >>> >>> Thanks to Alexander, I fixed my patch to use a function >>> from icu to count the length of the string. >>> >>> Changes: Travis has failed. Please, make sure it is OK before sending the patch. It doesn’t fail on my local (Mac) machine, so I guess this fail appears only on Linux system. >> Furthermore, description says that it “assumes well-formed UTF-8”, >> which in our case is not true. So who knows what may happen if we pass >> malformed byte sequence. I am not even saying that behaviour of >> this function on invalid inputs may change later. > > In it's current implementation U8_FWD_1_UNSAFE satisfy our needs safely. Returned > symbol length would never exceed byte_len. > > static int > utf8_char_count(const unsigned char *str, int byte_len) > { > int symbol_count = 0; > for (int i = 0; i < byte_len;) { > U8_FWD_1_UNSAFE(str, i); > symbol_count++; > } > return symbol_count; > } > > I agree that it is a bad idea to relay on lib behaviour which may > change lately. So maybe I would just inline these one line macros? > Or use my own implementation, since it’s more efficient (but less beautiful) Nevermind, let's keep it as is. I really worry only about the fact that in other places SQL_SKIP_UTF8 is used instead. It handles only two-bytes utf8 symbols, meanwhile U8_FWD_1_UNSAFE() accounts three and four bytes length symbols. Can we use everywhere the same pattern? [-- Attachment #2: Type: text/html, Size: 17493 bytes --]
next prev parent reply other threads:[~2019-02-22 12:59 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-01-29 9:56 [tarantool-patches] " Ivan Koptelov 2019-01-29 16:35 ` [tarantool-patches] " n.pettik 2019-02-04 12:34 ` Ivan Koptelov 2019-02-05 13:50 ` n.pettik 2019-02-07 15:14 ` i.koptelov 2019-02-11 13:15 ` n.pettik 2019-02-13 15:46 ` i.koptelov 2019-02-14 12:57 ` n.pettik 2019-02-20 13:54 ` i.koptelov 2019-02-20 15:47 ` i.koptelov 2019-02-20 16:04 ` n.pettik 2019-02-20 18:08 ` Vladislav Shpilevoy 2019-02-20 19:24 ` i.koptelov 2019-02-22 12:59 ` n.pettik [this message] 2019-02-25 11:09 ` i.koptelov 2019-02-25 15:10 ` n.pettik 2019-02-26 13:33 ` i.koptelov 2019-02-26 17:50 ` n.pettik 2019-02-26 18:44 ` i.koptelov 2019-02-26 20:16 ` Vladislav Shpilevoy 2019-03-04 11:59 ` i.koptelov 2019-03-04 15:30 ` Kirill Yukhin
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