文書整形 -- 指令の解読: アナクロなコンピューターエンジニアのつぶやき

指令は行頭から始まるので、とりあえず一文字目がなんであるかで、 その行が指令なのか、其れ以外なのか判断できる。そこで、メインルーチンは、 とりあえず、下記のように書ける。

RATFORでは、

# xformat -- text formater main program
      program xformat
      character inbuf(INSIZE)
      character getlin

      include cpage.ri

      call initfile
      call init

      while (getlin(inbuf,STDIN) != EOF)
          if (inbuf(1) == COMMAND)
              call comand(inbuf)        # it's a command
          else
              call text(inbuf)          # it's a text
      stop
      end

WATCOM fortran 77では、

c xformat -- text formater main program
      program xformat
      integer*1 inbuf(82)               ! INSIZE(82)
      integer*1 getlin

      include cpage.fi

      call initfile
      call init

      while (getlin(inbuf,5) .ne. -1) do ! STDIN(5) EOF(-1)
          if (inbuf(1) .eq. 46) then    ! COMMAND('.',46)
              call comand(inbuf)        ! it's a command
          else
              call text(inbuf)          ! it's a text
          end if
      end while
      stop
      end

ここで,サブルーチンinitは、大域変数を初期化するルーチンである。

RATFORでは、以下の通り。

# init.r4 -- set initial value
      subroutine init

      include cparam.ri
      include cpage.ri
      include cout.ri

# cparam
      fill  = YES
      lsval = 1
      inval = 0
      rmval = PAGEWIDTH
      tival = 0
      ceval = 0
      ulval = 0
# cpage
      curpag = 0
      newpag = 1
      lineno = 0
      plval  = PAGELEN
      m1val  = 4
      m2val  = 1
      m3val  = 4
      m4val  = 1
      bottom = plval - m3val - m4val
      header(1) = EOS
      footer(1) = EOS
# cout
      outp   = 0
      outw   = 0
      outwds = 0
      outbuf(1) = EOS
#
      return
      end

WATCOM fortran77では、以下の通り。

c init.f -- set initial value
      subroutine init

      include cparam.fi
      include cpage.fi
      include cout.fi

c cparam
      fill  = 1                         ! YES(1)
      lsval = 1
      inval = 0
      rmval = 60                        ! PAGEWIDTH(60)
      tival = 0
      ceval = 0
      ulval = 0
c cpage
      curpag = 0
      newpag = 1
      lineno = 0
      
      plval  = 66                       ! PAGELEN(66)
      m1val  = 4
      m2val  = 1
      m3val  = 4
      m4val  = 1
      bottom = plval - m3val - m4val
      header(1) = -2                    ! EOS(-2)
      footer(1) = -2                    ! EOS(-2)
c cout
      outp   = 0
      outw   = 0
      outwds = 0
      outbuf(1) = -2                    ! EOS(-2)
c
      return
      end