FTN4
      LOGICAL FUNCTION RNUM(IBUF,NCAR,NBCAR 
     .,RESUT),. 92080-1X049 REV.2026  800515
C 
C   SOURCE 92080-18049
C 
C 
C 
C     **************************************************************
C     * (C) COPYRIGHT HEWLETT-PACKARD COMPANY 1978.  ALL RIGHTS    *
C     * RESERVED.  NO PART OF THIS PROGRAM MAY BE PHOTOCOPIED, RE- *
C     * PRODUCED, OR TRANSLATED TO ANOTHER PROGRAM LANGUAGE WITH-  *
C     * OUT THE PRIOR WRITTEN CONSENT OF HEWLETT-PACKARD COMPANY.  *
C     **************************************************************
C 
C 
C*********************************************************************
C*                                                                   *
C*           RNUM IS A LOGICAL FUNCTION USED TO CONVERT AN ASCII     *
C*   BUFFER INTO A REAL NUMBER. CHECKS ARE PERFORMED AND FUNCTION    *
C*   SUCCEEDS IF THE INPUT BUFFER IS NOT CORRECT .                   *
C*                                                                   *
C*      IF(RNUM(IBUF,NCAR,NBCAR,RESUT)) GO TO ERROR                   * 
C*                                                                   *
C*            WHERE :                                                *
C*                   IBUF : INPUT BUFFER                             *
C*                   NCAR : NUMBER OF THE FIRST CHARACTER TO USE IN  *
C*                         THE INPUT BUFFER (FIRST IS 1)             *
C*                   NBCAR : NUMBER OF CHARACTERS TO BE USED         *
C*                   RESUT : REAL VARIABLE WHERE REAL VALUE IS        * 
C*                         RETURNED                                  *
C*                                                                   *
C*********************************************************************
C 
C 
      LOGICAL FLAGF,FLAGE,ISSPA,ISBTW,INUM
      DOUBLE PRECISION RESU 
C 
C FLAGF TO INDIC IF FIRST PART OF NUMBER ANALYZED 
C FLAGE "    "   IF SIGN ANALYZED 
C 
      RNUM=.FALSE.
      RESU=0. 
      IBL=0 
      IBL1=0
C 
C  BLANKS ONLY ?
C 
      IF(ISSPA(IBUF,NCAR,NBCAR)) GOTO 2 
      RETURN
C 
C  ANALYSE BUFFER 
C 
2     CONTINUE
      FLAGF=.FALSE. 
      FLAGE=.FALSE. 
      NB2=NBCAR+NCAR-1
      ISIGN=1 
      K=1 
      DO 1 I=NCAR,NB2 
      JNUM=-1 
      ICOM=IGET1(IBUF,I)
      IF(ICOM.NE.1H ) GO TO 6 
      IF(FLAGF) GO TO 35
      IF(IBL.EQ.1) IBL1=1 
      GO TO 1 
35    IBL=1 
      GO TO 1 
6     IF(FLAGE) GOTO 7
      FLAGE=.TRUE.
      IF(ICOM.EQ.1H+) GOTO 1
      IF(ICOM.NE.1H-) GOTO 7
      ISIGN=-1
      GOTO 1
 7    CONTINUE
      IF(.NOT.ISBTW(ICOM,1H0,1H9))JNUM=ICOM/256-60B 
      IF(FLAGF) GOTO 10 
      IF(ICOM.EQ.1H.) GOTO 4
      IF(ICOM.EQ.1HE) GOTO 30 
      IF(JNUM.EQ.-1) GO TO 50 
      IBL=1 
      RESU=RESU*10+JNUM 
      GOTO 1
4     CONTINUE
      FLAGF=.TRUE.
      IF(IBL1.EQ.1) GO TO 50
      IBL=0 
      GOTO 1
 10   CONTINUE
      IF((JNUM.EQ.-1).AND.(ICOM.NE.1HE)) GO TO 50 
      IF(ICOM.EQ.1HE) GOTO 30 
      IF(IBL.EQ.1) GO TO 50 
      RESU=RESU+DBLE(FLOAT(JNUM))/(10.**K)
      K=K+1 
      GOTO 1
30    CONTINUE
      J=I+1 
      IJ=NB2-I
      IF(IJ.LE.0) GO TO 50
      IF(INUM(IBUF,J,IJ,IRESU)) GO TO 50
C-----NORMALIZE BEFORE CHECKING EXPONENT. 
40    IF(RESU.EQ.0)  GO TO 49 
      IF(RESU.EQ.1.) GO TO 46 
      IF(RESU.GT.1.) GO TO 44 
C-----MOVE DECIMAL PT TO RIGHT
42    IF(RESU.GE.1) GO TO 46
      RESU=RESU*10. 
      IRESU=IRESU-1 
      GO TO 42
C-----MOVE DECIMAL PT TO LEFT 
44    IF((RESU.GE.1.).AND.(RESU.LT.10.)) GO TO 46 
      RESU=RESU/10. 
      IRESU=IRESU+1 
      GO TO 44
C-----MANITSSA NORMALIZED TO DECIMAL FRACTION BETWEEN 1 & 10
46    IF(IRESU.NE.38) GO TO 48
      IF(RESU.GT.1.) GO TO 50 
      GO TO 49
48    IF(IRESU.NE.-38) GO TO 49 
      IF(RESU.LT.1.) GO TO 50 
49    IF((IRESU.LT.-38).OR.(IRESU.GT.38)) GO TO 50
      IF(RESU.EQ.0) RESU=1
      IF(IRESU.LT.0) GOTO 20
      RESU=ISIGN*RESU*10.**IRESU
      GOTO 21 
20    CONTINUE
      RESU=ISIGN*RESU/10.**(-IRESU) 
      GOTO 21 
1     CONTINUE
 21   RESU=RESU*ISIGN 
      RESUT=RESU
      RETURN
C 
C   ERROR RETURN
C 
50    RNUM=.TRUE. 
      RETURN
      END 
      END$
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