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* negative mfs size at large memory [#u8b08276]

- ページ: [[LiveCD/4.5/BTS]]
- 投稿者: [[kaw]]
- 優先順位: 低
- 状態: 完了
- カテゴリー: malfunction
- 投稿日: 2009-02-26 (木) 09:03:35
- バージョン: 

** メッセージ [#z0e47bba]
more than 2^31 bytes are displayed as negative value. ~
Because ksh can handle integer range of -2^31 ... 2^31-1

On ksh, this is like this;
 $ echo $((2147483647))     # 2^31-1
 2147483647
 $ echo $((2147483647+1))   # 2^31
 -2147483648
Here's a concept code to check two strings representing big non-negative integer values.
 #!/bin/ksh
 
 function isgreater {
     # check presence of arguments
     #
     [ $# -lt 2 ] && return -- -1
 
     x=$1
     y=$2
 
     # Are arguments both form of positive integer?
     #
     case "$x" in
         0|[1-9]*([0-9])) :            ;; # ok, do nothing
                       *) return -- -2 ;; # ng, string is not positive integer 
     esac
     case "$y" in
         0|[1-9]*([0-9])) :            ;; # ok, do nothing
                       *) return -- -2 ;; # ng, string is not positive integer 
     esac
 
     # Compare it
     #
     if [ ${#x} -gt ${#y} ]; then
         return 0
     elif [ ${#x} -eq ${#y} ]; then
         if [ $x \> $y ]; then # string compare (not documented in ksh(1))
             return 0
         else
             return 1
         fi
     else
         return 1
     fi
 }
 
 isgreater $1 $2
 case $? in
     0) echo $1 is greater than $2. ;;
     1) echo $1 is NOT greater than $2. ;;
     *) echo argument format error ;;
 esac
Note
-This is needed by very early stage of boot time, so only ksh built-ins can be used.
-This is ksh-specific code.
----
- FIXED: above coding were introduced to /boottmp/rc at FuguIta-4.5-200905101 - 2009-05-10 (日) 17:14:55
- ENBUG: -gt must be replaced with > in function isgreater
- FIXED - 2009-05-19 (火) 12:00:30