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ADAS Subroutine i4fctn

      FUNCTION I4FCTN( STR , IABT )
C-----------------------------------------------------------------------
C
C  *************** FORTRAN77 INTEGER*4 FUNCTION: I4FCTN ****************
C
C  PURPOSE:  TO CONVERT AN INTEGER NUMBER STORED IN A STRING
C            INTO A INTEGER*4 VARIABLE
C
C  CALLING PROGRAM: GENERAL USE
C
C  FUNCTION:
C
C          (I*4)   I4FCTN  = FUNCTION NAME
C          (C*(*)) STR     = STRING CONTAINING SINGLE FLOATING POINT NO.
C          (I*4)   IABT    = RETURN CODE:
C                               0 => NO ERROR
C                               1 => ERROR (A VALUE 'I4FCTN=0' WILL BE
C                                           RETURNED).
C
C          (C*1)   CH0      = PARAMETER = '0'
C          (C*1)   CH9      = PARAMETER = '9'
C          (C*1)   BLANK    = PARAMETER = ' '
C          (C*1)   CPLUS    = PARAMETER = '+'
C          (C*1)   CMINUS   = PARAMETER = '-'
C
C          (I*4)   ILEN     = LENGTH OF 'STR' STRING IN BYTES
C          (I*4)   ILAST    = POSITION OF LAST BYTE OF IDENTIFIED NUMBER
C          (I*4)   I1       = STARTING BYTE IN 'STR' OF NUMBER
C                             INCLUDING SIGN IF PRESENT
C          (I*4)   IS       = 0 => NUMBER HAS NO SIGN
C                             1 => NUMBER HAS A SIGN
C          (I*4)   ICH0     = ICHAR('0')
C          (I*4)   ICH9     = ICHAR('9')
C          (I*4)   ISTR     = ICHAR(CURRENT BYTE POSITION IN 'STR')
C          (I*4)   I        = GENERAL USE
C
C          (L*4)   LFOUND   = .TRUE.  => ALL OF THE INPUT NUMBER BYTES
C                                        HAVE BEEN ASSESSED.
C                             .FALSE. => INPUT NUMBER BYTES STILL BEING
C                                        ASSESSED.
C          (L*4)   LSTART   = .TRUE.  => THE FIRST DIGIT HAS BEEN FOUND
C                             .FALSE. => THE FIRST DIGIT HAS NOT YET
C                                        BEEN REACHED.
C
C          (C*5)   CFORM5   = FORMAT FOR INTERNAL READING OF INTEGER
C
C
C NOTE:     AN ERROR WILL OCCUR (IABT=1) IF THERE IS MORE THAN ONE
C           NUMBER OCCURING IN THE STRING 'STR()'
C
C
C AUTHOR:   PAUL E. BRIDEN (TESSELLA SUPPORT SERVICES PLC)
C           K1/0/37
C           JET EXT. 2520
C
C DATE:     11/07/90
C
C UPDATE:   11/02/92 - PE BRIDEN: BLANKS NOW ALLOWED BETWEEN SIGN AND
C                                 FIRST DIGIT. LSTART VARIABLE ADDED.
C                                 VARIABLE I2 REMOVED.
C                                 + SOME MINOR RECODING - (IF STRING
C                                 ENTERED IS BLANK IABT IS NOW SET TO 1)
C
C UPDATE:   16/08/93 - PE BRIDEN: CORRECTED BUG TO ALLOW BLANKS BETWEEN
C                                 SIGN AND FIRST DIGIT (SEE ABOVE).
C                                 1) ILAST VARIABLE ADDED.
C                                 2) FORMATTED READ USED INSTEAD OF *
C                                    WHEN CONVERTING IDENTIFIED INTEGER
C                                    USING THE INTERNAL READ. (THIS
C                                    RESTRICTS IDENTIFIED NUMBER TO BE
C                                    < 100 BYTES IN LENGTH!)
C                                 3) EXCLUDE TRAILING BLANKS IN THE
C                                    INTERNAL READING OF THE INTEGER
C                                    I.E. STR(I1:ILAST) INSTEAD OF
C                                         STR(I1:ILEN)
C
C UPDATE:   07/03/95 - PE BRIDEN: INSTEAD OF USING FORMAT SPECIFIER I99
C                                 WHEN INTERNALLY READING THE INTEGER
C                                 CREATE THE APPROPRIATE SPECIFIER
C                                 WITHIN CFORM5 AND USE THIS.
C
C VERSION  : 1.3                          
C DATE     : 20-12-2001
C MODIFIED : Martin O'Mullane
C               - Removed mainframe listing information beyond column 72.
C
C VERSION  : 1.3                          
C DATE     : 10-04-2007
C MODIFIED : Allan Whiteford
C               - Modified documentation as part of automated
C		  subroutine documentation preparation.
C
C-----------------------------------------------------------------------
C
C-----------------------------------------------------------------------
      CHARACTER*(*)       STR
      INTEGER             IABT
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