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EXISTS.FOR
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1988-02-08
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LOGICAL FUNCTION EXISTS ( FNAME )
C*
C* *******************************
C* *******************************
C* ** **
C* ** EXISTS **
C* ** **
C* *******************************
C* *******************************
C*
C* SUBPROGRAM :
C* FILE EXISTANCE
C*
C* AUTHOR :
C* ART RAGOSTA
C* MS 207-5
C* AMES RESEARCH CENTER
C* MOFFETT FIELD, CA 94035
C* (415) 694-5578
C*
C* PURPOSE :
C* TO DETERMINE IF A FILE EXISTS ON THE SPECIFIED OR DEFAULT
C* DIRECTORY.
C*
C* METHODOLOGY :
C* OPENS THE FILE AS AN OLD FILE AND CHECKS TO SEE IF THIS
C* CREATES AN ERROR. IF IT DOES, THE FILE PROBABLY DOESN'T
C* EXIST. CLOSES FILE.
C*
C* INPUT ARGUMENTS :
C* FNAME - THE NAME OF THE FILE TO BE CHECKED.
C*
C* OUTPUT ARGUMENTS :
C* FUNCTION VALUE EXISTS - SET TRUE IF THE FILE WAS FOUND WITHOUT
C* ERROR, SET FALSE OTHERWISE.
C*
C* INTERNAL WORK AREAS :
C* NONE
C*
C* COMMON BLOCKS :
C* NONE
C*
C* FILE REFERENCES :
C* 0 - DUMMY UNIT USED FOR THE OPEN AND CLOSE STATEMENTS.
C*
C* DATA BASE ACCESS :
C* NONE
C*
C* SUBPROGRAM REFERENCES :
C* NONE
C*
C* ERROR PROCESSING :
C* ERR= USED ON THE OPEN AND CLOSE STATEMENTS.
C*
C* TRANSPORTABILITY LIMITATIONS :
C* NONE
C*
C* ASSUMPTIONS AND RESTRICTIONS :
C* NONE
C*
C* LANGUAGE AND COMPILER :
C* ANSI FORTRAN 77
C*
C* VERSION AND DATE :
C* VERSION I.0 31-AUG-84
C*
C* CHANGE HISTORY :
C* 31-AUG-84 INITIAL VERSION
C*
C***********************************************************************
C*
CHARACTER *(*) FNAME
C
OPEN (UNIT=0,STATUS='OLD',FILE=FNAME,ERR=1000)
CLOSE (UNIT=0,ERR=1000)
EXISTS = .TRUE.
RETURN
C
1000 EXISTS = .FALSE.
RETURN
END
C
C---END EXISTS
C