= Code conversion

        CV   [e2s|s2e|e2e|s2s|s2j|j2s|e2j|j2e] [z] [NX] [.lab1 .lab2]
        CV   {s2u|u2s|s2f|f2s|u2f|f2u} [bom] [be|le] [ibm|nec]
              [\u] ['err-rep-char']
        CV   {b2s|s2b|b2a|a2b} [CRLF|ANK] [CP290] [JIS78] [-S[a|d|r]|-SBCS]
              ['err-rep-char']　
        CV   {K2L|L2K}
        CV    x2c [EBC] [i[-m[:{n|max|rep}]]] [mult | -Hpre[XXpost]]
                  [CRLF|ANK] [CP290] [JIS78] [-S[bcs|a|d|r]

         DOS version support 1st format only.
         [NX] and [.lab1 .lab2] is common to all format.
         Utility XCV is contained in the zip file.

            e2s     :EUC -->SJIS
            s2e     :SJIS-->EUC
            s2s     :SJIS hankaku-katakana-->zenkaku-katakana
            e2e     :EUC hankaku-katakana-->zenkaku-katakana
            s2j/j2s :SJIS<-->JIS
            e2j/j2e :EUC <-->JIS
            s2u/u2s :SJIS<-->UCS2(2byte Unicode)
            s2f/f2s :SJIS<-->UTF8(8 bit UTF)
            u2f/f2u :UCS2<-->UTF8
            b2s/s2b :IBM-EBCDIC<-->SJIS(Japanese DBCS conversion).
            b2a/a2b :IBM-EBCDIC<-->ASCII SBCS(SO/SI(0x0e/0x0f) is ignored).
            k2L/L2k :HankakuKatakana<-->EnglishLowerCase letter.
                     When EBCDIC-->ASCII translated lowercase letter to
                     hankaku-katakana,re-translate the file to recover
                     lowercase letter.
                     k2L:re-conv by CP1027 the result of CP290
                     L2k:re-conv by CP290  the result of CP1027
            x2c     :convert hex notation string to char(ignore space).

            z       :hankaku-katakana-->zenkaku-katakana
#ifdef UNX
                     z of e2e if conversion type missing.
#else
                     z of s2s if conversion type missing.
#endif

             BOM       :Check/Write BOM(UTF-8 type mark) on top of file.
                        effective for u2f,s2f,f2u,f2s.
             BE/LE     :unicode endian type.default is BE for UNIX else LE.
                        use with u2s,u2f,s2u,f2u.
             IBM/NEC   :for the case multiple SJIS code point for a unicode,
                        specify target mapping region.
                        use with u2s,f2s. default is IBM.
             JIS78     :DBCS conversion by OLD-JIS sequence.
                        default is JIS83(NEW-JIS) sequence.
             ANK       :replace control char by 'err-rep-char',
             \u        :\uxxxx format unicode input conversion(u2s,u2f).
                       :\uxxxx format unicode output conversion(s2u,f2u).
             CRLF      :replace control char except CR,LF by 'err-rep-char'.
             EBC       :After x2c,do IBM-EBCDIC-->ASCII translation.
             CP290     :use IBM-CP290(katakana extension) for SBCS conversion.
                        default table for SBCS conversion is IBM-CP1027
                        (english lowercase letter extension).
                        this option is also avail for X2C with EBC option.
             i[-m[:{n|max|rep}]]
                       :Input column. default is TopOfLine. Up to EndOfLine
                        when m is missing.
                        n:Output column. default is TopOfLine.
                        max:Output to th right of longest line.
                        rep:convert hex digit in the place.
             mult      :continue hex conversion process even if invalid hex digit
                        detected.
             -Hpre[XXpost]:convert between prefix and postfix.
                           XX is delimitter of prefix and postfix.
                          ex). -H0x'     -Hx'xx'
             -S[a|d|r|bcs]
                 a     :assume SO on the top of line.
                 bcs   :SBCS mode(no DBCS coinsideration)
                 d     :del SO(0x0e)/SI(0x0f) for B2S.
                        SO/SI is not set for S2B.
                 r     :for S2B;replace adjacent space char by SO/SI or insert
                        SO/SI if no adjacent space char.

                       default is replace SO/SI by space for B2S,
                       insert SO/SI for S2B.
             err-rep-char:replacing char for the unicode with no corresponding
                          SJIS code.
                          use with u2s,f2s. default is '?'.
             NX        :limit the line to be converted to not excluded line.
             .lab1/2   :limit the line to be converted to that label range.