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Annotation of 42BSD/usr.lib/libI77/ioinit.f, revision 1.1

1.1     ! root        1: C
        !             2: C ioinit - initialize the I/O system
        !             3: C              @(#)ioinit.f    1.5
        !             4: C synopsis:
        !             5: C      logical function ioinit (cctl, bzro, apnd, prefix, vrbose)
        !             6: C      logical cctl, bzro, apnd, vrbose
        !             7: C      character*(*) prefix
        !             8: C
        !             9: C where:
        !            10: C      cctl    is .true. to turn on fortran-66 carriage control
        !            11: C      bzro    is .true. to cause blank space to be zero on input
        !            12: C      apnd    is .true. to open files at their end
        !            13: C      prefix  is a string defining environment variables to
        !            14: C              be used to initialize logical units.
        !            15: C      vrbose  is .true. if the caller wants output showing the lu association
        !            16: C
        !            17: C returns:
        !            18: C      .true. if all went well
        !            19: C
        !            20: C David L. Wasley
        !            21: C U.C.Bekeley
        !            22: C
        !            23:        logical function ioinit (cctl, bzro, apnd, prefix, vrbose)
        !            24:        logical         cctl, bzro, apnd, vrbose
        !            25:        character*(*)   prefix
        !            26: 
        !            27:        automatic       iok, fenv, ienv, ename, fname, form, blank
        !            28:        logical         iok, fenv, ienv
        !            29:        integer*2       ieof, ictl, izro
        !            30:        character       form, blank
        !            31:        character*32    ename
        !            32:        character*256   fname
        !            33:        common /ioiflg/ ieof, ictl, izro
        !            34: 
        !            35:        if (cctl) then
        !            36:            ictl = 1
        !            37:            form = 'p'
        !            38:        else
        !            39:            ictl = 0
        !            40:            form = 'f'
        !            41:        endif
        !            42: 
        !            43:        if (bzro) then
        !            44:            izro = 1
        !            45:            blank = 'z'
        !            46:        else
        !            47:            izro = 0
        !            48:            blank = 'n'
        !            49:        endif
        !            50: 
        !            51:        open (unit=5, form=form, blank=blank)
        !            52:        open (unit=6, form=form, blank=blank)
        !            53: 
        !            54:        if (apnd) then
        !            55:            ieof = 1
        !            56:        else
        !            57:            ieof = 0
        !            58:        endif
        !            59: 
        !            60:        iok = .true.
        !            61:        fenv = .false.
        !            62:        ienv = .false.
        !            63:        lp = len (prefix)
        !            64: 
        !            65:        if ((lp .gt. 0) .and. (lp .le. 30) .and. (prefix .ne. " ")) then
        !            66:            ienv = .true.
        !            67:            nb = index (prefix, " ")
        !            68:            if (nb .eq. 0) nb = lp + 1
        !            69:            ename = prefix
        !            70:            if (vrbose) write (0, 2002) ename(:nb-1)
        !            71:            do 200 lu = 0, 19
        !            72:                write (ename(nb:), "(i2.2)") lu
        !            73:                call getenv (ename, fname)
        !            74:                if (fname .eq. " ") go to 200
        !            75: 
        !            76:                open (unit=lu, file=fname, form='f', access='s', err=100)
        !            77:                if (vrbose) write (0, 2000) lu, fname(:lnblnk(fname))
        !            78:                fenv = .true.
        !            79:                go to 200
        !            80: 
        !            81:   100          write (0, 2003) ename(:nb+1)
        !            82:                call perror (fname(:lnblnk(fname)))
        !            83:                iok = .false.
        !            84: 
        !            85:   200      continue
        !            86:        endif
        !            87: 
        !            88:        if (vrbose) then
        !            89:            if (ienv .and. (.not. fenv)) write (0, 2001) ename(:nb-1)
        !            90:            write (0, 2004) cctl, bzro, apnd
        !            91:            call flush (0)
        !            92:        endif
        !            93: 
        !            94:        ioinit = iok
        !            95:        return
        !            96: 
        !            97:  2000  format ('ioinit: logical unit ', i2,' opened to ', a)
        !            98:  2001  format ('ioinit: no initialization found for ', a)
        !            99:  2002  format ('ioinit: initializing from ', a, 'nn')
        !           100:  2003  format ('ioinit: ', a, ' ', $)
        !           101:  2004  format ('ioinit: cctl=', l, ', bzro=', l, ', apnd=', l)
        !           102:        end

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