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Annotation of 42BSD/usr.lib/libI77/ioinit.f, revision 1.1.1.1

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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