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| author | bar@mysql.com <> | 2004-10-21 15:11:01 +0500 |
|---|---|---|
| committer | bar@mysql.com <> | 2004-10-21 15:11:01 +0500 |
| commit | aec49dae4d0d2c2c9c5a6d91b6839d2550dc325d (patch) | |
| tree | 391a59fb56f5f0290b54df71ff2c2443c5c8fb8a | |
| parent | 636ddd4128536e14292daa23c1b78f285145f6f8 (diff) | |
| download | mariadb-git-aec49dae4d0d2c2c9c5a6d91b6839d2550dc325d.tar.gz | |
CHARSET_INFO.txt:
New comments about ctype[].
| -rw-r--r-- | strings/CHARSET_INFO.txt | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/strings/CHARSET_INFO.txt b/strings/CHARSET_INFO.txt index 883000e7ade..b0a6271e4c8 100644 --- a/strings/CHARSET_INFO.txt +++ b/strings/CHARSET_INFO.txt @@ -74,7 +74,16 @@ Conversion tables ctype - pointer to array[257] of "type of characters" bit mask for each chatacter, e.g. if a character is a digit or a letter or a separator, etc. - to_lower - pointer to arrat[256] used in LCASE() + + Monty 2004-10-21: + If you look at the macros, we use ctype[(char)+1]. + ctype[0] is traditionally in most ctype libraries + reserved for EOF (-1). The idea is that you can use + the result from fgetc() directly with ctype[]. As + we have to be compatible with external ctype[] versions, + it's better to do it the same way as they do... + + to_lower - pointer to array[256] used in LCASE() to_upper - pointer to array[256] used in UCASE() sort_order - pointer to array[256] used for strings comparison |