{s n} {                             
        set c [csplit $s]
        if {$n > [expr [llength [lindex $c 0]]-1]} {set n [expr [llength [lindex $c 0]]-1]}
        set b 0
        set u 0                            
        set cf -1
        set cb -1                               
        set r ""
        foreach f [lindex $c 1] {
                if {[lindex $f 0] > $n} {
                        if {$b eq 1} {append r "\002"}
                        if {$u eq 1} {append r "\037"}
                        if {$cf > -1} {append r [format "\002%s" $cf]}
                        if {$cb > -1} {append r [format ",%s" $cb]}
                        return $r               
                }
                if {[lindex $f 1] eq "\002"} {set b [expr $b ^ 1]}
                if {[lindex $f 1] eq "\037"} {set u [expr $u ^ 1]}
                if {[lindex $f 1] eq "\003"} {set cf -1;set cb -1}
                if {[lindex $f 1] eq "\017"} {set cf -1;set cb -1;set b 0;set u 0}
                if {[lindex $f 1] eq "\026"} {set t $cb;set cb $cf;set cf $t}
                if {[set m [regexp -inline {([\d]+)$} [lindex $f 1]]] ne ""} {set cf [lindex $m 1]}
                if {[set m [regexp -inline {([\d]+),([\d]+)} [lindex $f 1]]] ne ""} {set cf [lindex $m 1];set cb [lindex $m 2]}
        }
        if {$b eq 1} {append r "\002"}          
        if {$u eq 1} {append r "\037"}
        if {$cf > -1} {append r [format "\002%s" $cf]}
        if {$cb > -1} {append r [format ",%s" $cb]}
        return $r
}