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      SUBROUTINE REUSER
C     RENBR(REUSR3/DIALOG OF FILE NAMES 1 PER LINE)
C
C     DONALD BARTH, HARVARD BUSINESS SCHOOL
C
C     THIS  VERSION OF THE  USER COMMAND  DIALOG  PROCESSOR
C     FOR RENBR ASKS THE USER TO SUPPLY THE NAMES OF ONE OR
C     BOTH OUTPUT FILES AND THE NAMES  ONE  OR  MORE  INPUT
C     FILES.  RENUMBERING IS PERFORMED IF, AND ONLY IF, THE
C     USER SUPPLIES A NAME FOR THE RENUMBERED OUTPUT  FILE.
C     LISTING  IS  PERFORMED  IF,  AND  ONLY  IF,  THE USER
C     SUPPLIES A NAME FOR THE LISTING FILE.  A SINGLE INPUT
C     FILE  CAN  CONTAIN  MANY PROGRAMS AND/OR ROUTINES, OR
C     MERELY A PORTION OF A PROGRAM OR ROUTINE.  ALL  INPUT
C     FILES  ARE  COPIED  INTO  EACH  OF  THE OUTPUT FILES.
C     THE LIST OF INPUT FILES IS  TERMINATED  BY  TYPING  A
C     BLANK  INPUT  FILE  NAME.  AFTER TYPING A BLANK INPUT
C     FILE NAME, A NEW SET OF OUTPUT AND INPUT FILES CAN BE
C     ESTABLISHED.   PROCESSING  IS  TERMINATED  BY  TYPING
C     BLANK NAMES FOR BOTH POSSIBLE OUTPUT FILES.
C
      COMMON/RNBONE/I     ,IALPHA,IBASE ,IBR   ,IBREAK,
     1IEND  ,IENTER,IEOF  ,IERR  ,IFILL ,IFORM ,IFREAR,
     2IHIHDO,IIN   ,ILEVEL,ILPT  ,INCR  ,INCSAV,INDENT,
     3INDSAV,ININAM,INIOPR,INIPRT,INITOC,INRCPY,INRFND,
     4IOUT  ,IPAGE ,IPASS ,IPOINT,ISPACE,ISPLIT,ISPR  ,
     5ISTART,ISTN  ,ITAB  ,ITBL  ,ITITLE,ITRACE,ITTY  ,
     6J     ,JBGN  ,JBREAK,JEND  ,JEOF  ,JFORM ,JIN   ,
     7JIN1  ,JLEVEL,JMPBGN,JMPEND,JOBNUM,JOUT  ,JPASS ,
     8JPOINT,JSPLIT,JSTN  ,JTAB  ,JTBL  ,JTTY  ,K     ,
     9KBGN  ,KEND  ,KLEVEL,KMDMAX,KMDMIN,KNDGRP,KNT
C
      COMMON/RNBTWO/KNTONE,KNTPNT,KNTSPL,KNTTOC,KNTTWO,
     1KOMENT,KOMKNT,KOMNUM,KONTRL,KOUNT ,KPAGE ,KPASS ,
     2KPOINT,KPYEND,KSTN  ,KTAB  ,KUTNUM,KUTPAG,KUTPNT,
     3KUTSPL,L     ,LCLNUM,LCLPNT,LCLSPL,LEFT  ,LEND  ,
     4LIKE  ,LMTTOC,LNGCOM,LNGNAM,LNGNXT,LOWDO ,LOWER ,
     5LOWSHO,LOWTOC,LOW1  ,LOW2  ,LPOINT,LPTTTY,LRGNUM,
     6LRGPNT,LRGSPL,LRGTOC,LSTKNT,LSTN  ,LSTSTN,LTAB  ,
     7M     ,MANY  ,MASTER,MAXCOM,MAXEND,MAXLIN,MAXPNT,
     8MAXPRT,MAXSPL,MAXTOC,MID   ,MODBAS,MODINC,MODMAX,
     9MODMIN,MODNEW,MODOLD,MOST  ,MOVE  ,MSTN  ,MTAB
C
      COMMON/RNBTHR/N     ,NCD   ,NEED  ,NEWNUM,NEWSTN,
     1NONFOR,NOWTOC,NSTN  ,NTAB  ,NUM   ,NXTEND,NXTLST
C
      COMMON/RNBFOU/INRSTR(21)  ,JPNT(10)    ,LINREF(9)   ,
     1 MCHOPR(51)  ,NNEW(1000)  ,NOLD(1000)  ,NOTOPR(51)  ,
     2 NUMPNT(5000),NUMPRS(655) ,NUMTOC(112) ,NUMTYP(7)
C
      COMMON/RNBFIV/LTRCLN,LTRDDD,LTRDOT,LTREEE,LTREQL,
     1LTREXC,LTRHHH,LTRLFT,LTRMNS,LTRNOW,LTRPLS,LTRQOT,
     2LTRREF,LTRRIT,LTRSEM,LTRSLA,LTRSPC,LTRTAB,LTR1ST,
     3LTR2ND,LWRDDD,LWREEE,LWRHHH
C
      COMMON/RNBSIX/LTRABC(26)  ,LTRBGN(5)   ,LTRBIG(2211),
     1 LTRCOM(6)   ,LTRDGT(10)  ,LTREND(3)   ,LTRFLG(8)   ,
     2 LTRKEY(5)   ,LTRNAM(10)  ,LTROPR(51)  ,LTRPRS(331) ,
     3 LTRSPL(2000),LTRSRT(26)  ,LTRTOC(168) ,LTRTOP(117) ,
     4 LTRTTL(5)   ,LTRTYP(55)  ,LTRUSE(6)   ,LTR120(120) ,
     5 LWRABC(26)  ,LWRBGN(5)   ,LWREND(3)   ,LWRFLG(8)   ,
     6 LWRKEY(5)   ,LWRPRS(331) ,LWRSRT(26)  ,LWRTTL(5)
      DOUBLE PRECISION FILSRC,FILRNB,FILLPT,FILSPC
      DATA FILSPC/'          '/
C
C     DETERMINE IF THIS IS FIRST TIME THIS ROUTINE CALLED
      JPASS=1
      IF(MASTER.GT.1)GO TO 10
      IPAGE=0
      INCR=0
      IF(MASTER.EQ.1)WRITE(ITTY,1)
    1 FORMAT(14H RENBR (03/85)/1X)
      IF(MASTER.EQ.1)WRITE(ITTY,2)
    2 FORMAT(
     140H SPECIFY A LISTING FILE TO GET A LISTING/
     245H SPECIFY A RENUMBERED FILE TO GET RENUMBERING)
      IF(MASTER.NE.1)WRITE(ITTY,3)
    3 FORMAT(
     146H DON'T SPECIFY EITHER FILE IF YOU WANT TO EXIT)
C
C     OPEN LISTING FILE
    4 WRITE(ITTY,5)
    5 FORMAT('    OUTPUT LISTING FILE: ',$)
      READ(JTTY,13)FILLPT
      IF(FILLPT.EQ.FILSPC)GO TO 6
      IPAGE=1
      OPEN(UNIT=ILPT,FILE=FILLPT,ACCESS='SEQOUT',
     1DEVICE='LPT')
C
C     OPEN RENUMBERED OUTPUT FILE
    6 WRITE(ITTY,7)
    7 FORMAT(' OUTPUT RENUMBERED FILE: ',$)
      READ(JTTY,13)FILRNB
      IF(FILRNB.EQ.FILSPC)GO TO 8
      INCR=1
      OPEN(UNIT=IOUT,FILE=FILRNB,ACCESS='SEQOUT')
      GO TO 11
    8 IF(IPAGE.NE.0)GO TO 11
      IF(MASTER.NE.1)GO TO 18
      WRITE(ITTY,9)
    9 FORMAT(' AT LEAST 1 OUTPUT FILE MUST BE SPECIFIED')
      GO TO 4
C
C     OPEN INPUT FILE
   10 CLOSE(UNIT=IIN)
   11 WRITE(ITTY,12)
   12 FORMAT('      INPUT SOURCE FILE: ',$)
      READ(JTTY,13)FILSRC
   13 FORMAT(1A10)
      IF(FILSRC.EQ.FILSPC)GO TO 16
      OPEN(UNIT=IIN,FILE=FILSRC,ACCESS='SEQIN',ERR=14)
      GO TO 19
   14 WRITE(ITTY,15)
   15 FORMAT(' FILE CAN NOT BE READ')
      GO TO 11
   16 IF(MASTER.NE.1)GO TO 18
      WRITE(ITTY,17)
   17 FORMAT(' FIRST INPUT FILE MUST BE SPECIFIED')
      GO TO 11
C
C     RETURN TO CALLING PROGRAM
   18 JPASS=0
   19 RETURN
      END