Re: "-M" option does not work with "+" "-" characters

[Hyunho Cho]

thanks for your patch.
I have applied your patch and tested but weird things happened.
this is my test code

bash$ cat a.awk 
{
    for (i = 1; i <= NF; i++) {
        switch ($i) {
            case "+" : case "-" :
            case "*" : case "/" :
            case "%" : case "^" :
                printf $i; break
            case /[a-z]/ :
                printf $i; break
            case /[0-9]/ : 
                printf $i; break
            case /[ \t]/ :
                printf $i; break
            default :
                print " wrong character " i " th: "  $i
        }
    }
    print ""
}

# without "-M" option, all works fine
bash$ awk -vFS="" -f a.awk <<< 12+45 
12+45

# if i add "-M" option then "+" "-" characters make errors like this
bash$ awk -vFS="" -M -f a.awk <<< 12+45 
12+ wrong character 4 th: 
 wrong character 5 th: 

# if i check 4 th and 5 th characters with od command 
# there are weird "nul" characters exist
bash$ awk -vFS="" -M -f a.awk <<< 12+45  od -a
0000000   1   2   +  sp   w   r   o   n   g  sp   c   h   a   r   a   c
0000020   t   e   r  sp   4  sp   t   h   :  sp nul  nl  sp   w   r   o
0000040   n   g  sp   c   h   a   r   a   c   t   e   r  sp   5  sp   t
0000060   h   :  sp nul  nl  nl
0000066