implicit real*8 (a-h,o-z)
      include 'DIMENSIONS'
      include 'COMMON.CHAIN'
      include 'COMMON.INTERACT'
      include 'COMMON.SBRIDGE'
      real*4 coord(3,1000)
      real*4 prec,time,potE,uconst,t_bath,qfrag(100)
      real*8 etot
      character*80 arg,seqfile,pdbfile
      character*3 sequenc(maxres)
      character*50 tytul
      character*8 onethree,cfreq
      character*8 ucase
      external ucase
      logical oneletter,iblnk
      integer rescode
      external rescode
      
      do i=1,maxres
       sequenc(i)=''
      enddo

      ifreq=1
      if (iargc().lt.3) then
        print '(a)',
     &    "Usage: xdrf2pdb one/three seqfile cxfile [freq] [pdbfile]"
        stop
      endif
      call getarg(1,onethree)
      onethree = ucase(onethree)
      if (onethree.eq.'ONE') then
        oneletter = .true.
      else if (onethree.eq.'THREE') then
        oneletter = .false.
      else
        print *,"ONE or THREE must be specified"
      endif
      call getarg(2,seqfile)
      open (1,file=seqfile,status='old')
      if (oneletter) then
        read(1,'(80a1)',end=10,err=10) (sequenc(i)(1:1),i=1,maxres)
   10   continue
        nres=i
        i=0
        do while (.not.iblnk(sequenc(i+1)(1:1)))
          i=i+1
        enddo 
        nres=i
        do i=1,nres
          itype(i)=rescode(i,sequenc(i),1)
        enddo
      else
        read(1,'(20(a3,1x))',end=11,err=11) (sequenc(i),i=1,maxres)
   11   continue
        nres=i
        i=0
        do while (.not.iblnk(sequenc(i+1)(1:1)))
          print *,sequenc(i+1)
          i=i+1
        enddo 
        nres=i
        do i=1,nres
          itype(i)=rescode(i,sequenc(i),0)
        enddo
      endif
      call getarg(3,arg)
      iext = index(arg,'.cx') - 1
      if (iext.lt.0) then
        print *,"Error - not a cx file"
        stop
      endif
      if (iargc().gt.3) then
        call getarg(4,cfreq)
        read (cfreq,*) ifreq
      endif
      if (iargc().gt.4) then
        call getarg(5,pdbfile)
      else
        pdbfile=arg(:iext)//'.pdb'
      endif
      open(9,file=pdbfile)
      nnt = 1
      if (itype(1).eq.21) nnt = 2
      nct=nres
      if (itype(nres).eq.21) nct = nres-1

      call xdrfopen_(ixdrf,arg, "r", iret)
       
      kk = 0
      do while(.true.) 
       call xdrffloat_(ixdrf, time, iret)
       if(iret.eq.0) exit
       kk = kk + 1
       call xdrffloat_(ixdrf, potE, iret)
       call xdrffloat_(ixdrf, uconst, iret)
       call xdrffloat_(ixdrf, t_bath, iret)
       call xdrfint_(ixdrf, nss, iret) 
       do j=1,nss
        call xdrfint_(ixdrf, ihpb(j), iret)
        call xdrfint_(ixdrf, jhpb(j), iret)
       enddo
       call xdrfint_(ixdrf, nfrag, iret)
       do i=1,nfrag
        call xdrffloat_(ixdrf, qfrag(i), iret)
       enddo
       prec=10000.0

       isize=0
       call xdrf3dfcoord_(ixdrf, coord, isize, prec, iret)


c       write (*,'(e15.8,2e15.5,f12.5,$)') time,potE,uconst,t_bath
c       write (*,'(i4,$)') nss,(ihpb(j),jhpb(j),j=1,nss)
c       write (*,'(i4,20f7.4)') nfrag,(qfrag(i),i=1,nfrag)
c       write (*,'(8f10.5)') ((coord(k,j),k=1,3),j=1,isize)
       if (mod(kk,ifreq).eq.0) then
         if (isize .ne. nres + nct - nnt + 1) then
           print *,"Error: inconsistent sizes",isize,nres+nct-nnt+1
         endif
         do i=1,nres
           do j=1,3
             c(j,i)=coord(j,i)
           enddo
         enddo
         ii = 0
         do i=nnt,nct
           ii = ii + 1 
           do j=1,3
             c(j,i+nres)=coord(j,ii+nres)
           enddo
         enddo
         etot=potE
         write (tytul,'(a,i6)') "Structure",kk
         call pdbout(etot,tytul,9)
       endif
      enddo
     
      end