38 lines
1.1 KiB
FortranFixed
38 lines
1.1 KiB
FortranFixed
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SUBROUTINE DM_CHKF ( iflno, iret )
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C************************************************************************
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C* DM_CHKF *
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C* *
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C* This subroutine checks that the input file number is in the *
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C* proper range and that a file has been opened using that number. *
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C* *
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C* DM_CHKF ( IFLNO, IRET ) *
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C* *
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C* Input parameters: *
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C* IFLNO INTEGER File number to check *
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C* *
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C* Output parameters: *
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C* IRET INTEGER Return code *
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C* 0 = normal return *
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C* -4 = file not open *
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C** *
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C* Log: *
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C* M. desJardins/GSFC 6/86 *
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C************************************************************************
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INCLUDE 'GEMPRM.PRM'
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INCLUDE 'GMBDTA.CMN'
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INCLUDE 'dmcmn.cmn'
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C------------------------------------------------------------------------
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C* Check that file number is in proper range and then see that a
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C* file has been opened using that file number, i.e. the logical
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C* unit number for the file is non-negative.
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C
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iret = 0
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IF ( ( iflno .lt. 1) .or. ( iflno .gt. MMFILE ) ) THEN
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iret = -4
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ELSE
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IF ( lundm (iflno) .lt. 0 ) iret = -4
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END IF
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C*
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RETURN
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END
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