Commit 2f29f9ea authored by unknown's avatar unknown
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CHARSET_INFO.txt: 

  New comments about ctype[].


strings/CHARSET_INFO.txt:
  New comments about ctype[].
parent 154a5c17

strings/CHARSET_INFO.txt

+10 −1
Original line number Diff line number Diff line
@@ -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