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CHARSET_INFO.txt:

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New comments about ctype[].
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bar@mysql.com 2004-10-21 15:11:01 +05:00
parent 636ddd4128
commit aec49dae4d
1 changed files with 10 additions and 1 deletions
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11
strings/CHARSET_INFO.txt
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@ -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