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C Copyright 1981-2007 ECMWF
C
C Licensed under the GNU Lesser General Public License which
C incorporates the terms and conditions of version 3 of the GNU
C General Public License.
C See LICENSE and gpl-3.0.txt for details.
C
SUBROUTINE JOPNLLF( IALEG, PINTVL, KTRUNC, KUNIT, PBUILD, KRET)
C
C---->
C**** JOPNLLF
C
C Purpose
C _______
C
C This routine finds a file of legendre polynomials corresponding
C to a given grid interval and truncation, allocates memory, reads
C the coefficients into the memory and returns a unit number.
C
C Interface
C _________
C
C CALL JOPNLLF( IALEG, PINTVL, KTRUNC, KUNIT, PBUILD, KRET)
C
C Input parameters
C ________________
C
C PINTVL - Grid interval in degrees
C KTRUNC - Spherical truncation
C
C Output parameters
C _________________
C
C IALEG - Pointer for memory array for legendre coefficients
C KUNIT - Unit number from PBOPEN
C 0 , open failed
C PBUILD - Grid interval used to build the legendre
C coefficients file (degrees)
C KRET - Return status code
C 0 = OK
C
C Common block usage
C __________________
C
C Uses common JDCSPGP for size NISIZE6
C
C Method
C ______
C
C Builds a file name from the truncation and grid interval and
C tries to open a file of that name.
C
C If the file is already open (from a previous call), the
C previous unit number is returned.
C If a different file is already open (from a previous call), the
C the existing file is closed.
C
C If no file can be located, a file is created. Memory is dynamically
C allocted and the coefficients are read into the memory array.
C
C Externals
C _________
C
C PBOPEN3 - Open binary file and return unit number
C PBREAD3 - Read binary file
C PBCLOSE3 - Close binary file
C JFINDIR - Find the file of legendre coefficients
C JMAKLL - Makes a file of legendre coefficients
C INTLOG - Output log message
C JCHMOD - Change file permissions
C RENAME - Rename file
C
C Reference
C _________
C
C NONE
C
C Comments
C ________
C
C The Legendre polynomials for the transforms may be held in
C a ready-made file whose name is held in an environment variable:
C cf_txxxx_raabbbbb Txxxx aa.bbbbb degrees
C For example,
C cf_t0213_r0050000 T213 0.5 degrees
C cf_t0106_r0250000 T106 2.5 degrees
C
C On the C90, the file of polynomials may be cached in /owrk/marsint
C
C Otherwise the file is located in (or will be created in) the first
C directory given by one of the following (in the order listed, if
C they exist):
C environment variable PPDIR
C or
C the current working directory.
C
C Author
C ______
C
C J.D.Chambers *ECMWF* Jun 1996
C
C Modifications
C _____________
C
C J.D.Chambers ECMWF Feb 1997
C Allow for 64-bit pointers
C
C----<
C _______________________________________________________
C
IMPLICIT NONE
C
#include "parim.h"
#include "jparams.h"
#include "jparam2.h"
C
C Parameters
C
INTEGER JPROUTINE
PARAMETER ( JPROUTINE = 30910 )
C
C Subroutine arguments
C
REAL PINTVL, PBUILD
INTEGER KTRUNC, KUNIT, KRET
C
C Local variables
C
INTEGER IRET, IOFFSET, ISIZE, NPBYTES
#ifdef REAL_8
DATA NPBYTES/8/
#else
DATA NPBYTES/4/
#endif
LOGICAL LFOUND
CHARACTER*256 DIRNAME
CHARACTER*256 FILENAME, FILEDUM
CHARACTER*512 FULLPATH
CHARACTER*20 YPFN
#ifdef REAL_8
DATA YPFN/'CF_Txxxx_Raabbbbb'/
#else
DATA YPFN/'cf_txxxx_raabbbbb'/
#endif
INTEGER NUNIT
DATA NUNIT/0/
#ifdef POINTER_64
INTEGER*8 IALEG
#endif
REAL ALEG
DIMENSION ALEG(1)
POINTER ( IALEG, ALEG )
C
SAVE NUNIT
C
C Externals
C
LOGICAL JFINDIR
LOGICAL JFINDFN3
INTEGER JCHMOD, RENAME
C
C _______________________________________________________
C
C* Section 1. See if required file already in use.
C _______________________________________________________
C
100 CONTINUE
C
C Setup the filename: cf_txxxx_raabbbbb
C
WRITE(YPFN(5:8),'(I4.4)') KTRUNC
WRITE(YPFN(11:17),'(I7.7)') NINT(PINTVL*JPMULT)
CALL INTLOG(JP_DEBUG,
X 'JOPNLLF: Coefficients file to open is:', JPQUIET)
CALL INTLOG(JP_DEBUG, YPFN, JPQUIET)
PBUILD = PINTVL
C
C If file already open, return the existing unit number
C
IF( YPFN.EQ.YOLDLL ) THEN
CALL INTLOG(JP_DEBUG,'JOPNLLF: File already open.',JPQUIET)
KUNIT = NUNIT
GOTO 900
ENDIF
C
C Otherwise, ensure existing unit is closed
C
IF( NUNIT.NE.0 ) THEN
CALL PBCLOSE3(NUNIT, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'JOPNLLF: PBCLOSE3 error',IRET)
KRET = JPROUTINE + 1
GOTO 990
ENDIF
NUNIT = 0
ENDIF
C _______________________________________________________
C
C* Section 2. See if the file has already been created.
C _______________________________________________________
C
200 CONTINUE
C
C Set appropriate build inteval
C
WRITE(YPFN(11:17),'(I7.7)') NINT(PBUILD*JPMULT)
C
IOFFSET = INDEX(YPFN,' ') - 1
FILENAME = YPFN(1:IOFFSET)
C
LFOUND = JFINDIR('PPDIR', DIRNAME)
IF( LFOUND ) THEN
LFOUND = JFINDFN3(DIRNAME,FILENAME,IOFFSET,NUNIT)
IF( LFOUND ) GOTO 500
ENDIF
C
C Try present working directory
C
IOFFSET = INDEX(YPFN, ' ') - 1
FILENAME = YPFN(1:IOFFSET)
CALL PBOPEN3( NUNIT, FILENAME(1:IOFFSET), 'r', IRET)
IF( IRET.EQ.0 ) GOTO 500
C _______________________________________________________
C
C* Section 3. File doesn't exist, find a suitable directory for it.
C _______________________________________________________
C
300 CONTINUE
C
LFOUND = JFINDIR('PPDIR', DIRNAME)
IF ( LFOUND ) THEN
IOFFSET = INDEX(DIRNAME, ' ') - 1
FULLPATH = DIRNAME(1:IOFFSET) // '/' // FILENAME
IOFFSET = INDEX(FULLPATH, ' ') - 1
FILENAME(1:IOFFSET) = FULLPATH(1:IOFFSET)
FILEDUM(1:IOFFSET) = FILENAME(1:IOFFSET)
#ifdef REAL_8
FILEDUM(IOFFSET-16:IOFFSET-15) = 'XX'
#else
FILEDUM(IOFFSET-16:IOFFSET-15) = 'xx'
#endif
CALL PBOPEN3(NUNIT, FILEDUM(1:IOFFSET), 'w', IRET)
IF( IRET.EQ.0 ) GOTO 400
ENDIF
C
C Try present working directory
C
IOFFSET = INDEX(YPFN,' ') - 1
FILENAME = YPFN(1:IOFFSET)
FILEDUM(1:IOFFSET) = FILENAME(1:IOFFSET)
#ifdef REAL_8
FILEDUM(IOFFSET-16:IOFFSET-15) = 'XX'
#else
FILEDUM(IOFFSET-16:IOFFSET-15) = 'xx'
#endif
CALL PBOPEN3(NUNIT, FILEDUM(1:IOFFSET), 'w', IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_FATAL,'JOPNLLF: PBOPEN3 error.',IRET)
KRET = JPROUTINE + 2
GOTO 990
ENDIF
C _______________________________________________________
C
C* Section 4. Create the coefficients file.
C _______________________________________________________
C
400 CONTINUE
C
C Let user know that a new file is being created.
C
IOFFSET = INDEX(FILENAME, ' ') - 1
CALL INTLOG(JP_DEBUG,'JOPNLLF: Creating new coefficients file:',
X JPQUIET)
CALL INTLOG(JP_DEBUG,FILENAME(1:IOFFSET), JPQUIET)
C
C Change access mode to 'read only' for all users.
C
IRET = JCHMOD(FILEDUM(1:IOFFSET),'0444')
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_FATAL,'JOPNLLF: JCHMOD error.',IRET)
KRET = JPROUTINE + 3
GOTO 990
ENDIF
C
C Allocate memory for the array used in making the file
C
ISIZE = (KTRUNC+1)*(KTRUNC+4)*(NINT(90.0/PBUILD)+1)/2
IF( ISIZE.GT.NISIZE6 ) THEN
CALL JMEMHAN( 6, IALEG, ISIZE, 1, KRET)
IF( KRET.NE.0 ) THEN
CALL INTLOG(JP_FATAL,'JOPNLLF: memory allocation error',IALEG)
KRET = JPROUTINE + 3
GOTO 990
ENDIF
NISIZE6 = ISIZE
ENDIF
C
C Make coefficients file
C
CALL JMAKLL3( NUNIT, KTRUNC, PBUILD, 0.0, ALEG, KRET)
IF ( KRET .NE. 0 ) GOTO 990
C
C De-allocate memory for the array used in making the file
C
CALL JMEMHAN( 6, IALEG, ISIZE, 0, KRET)
IF( KRET.NE.0 ) THEN
CALL INTLOG(JP_FATAL,'JOPNLLF: memory dealloc error',IALEG)
KRET = JPROUTINE + 4
GOTO 990
ENDIF
NISIZE6 = 0
C
C Close rename it, re-open for reading, leave it open.
C
CALL PBCLOSE3( NUNIT, IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_FATAL,'JOPNLLF: PBCLOSE3 error.',IRET)
KRET = JPROUTINE + 5
GOTO 990
ENDIF
NUNIT=0
C
IRET = RENAME(FILEDUM(1:IOFFSET),FILENAME(1:IOFFSET))
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_FATAL,'JOPNLLF: RENAME of file failed',JPQUIET)
KRET = JPROUTINE + 5
GOTO 990
ENDIF
C
CALL PBOPEN3( NUNIT, FILENAME(1:IOFFSET), 'r', IRET)
IF( IRET.NE.0 ) THEN
CALL INTLOG(JP_FATAL,'JOPNLLF: PBOPEN3 error.',IRET)
KRET = JPROUTINE + 6
GOTO 990
ENDIF
C _______________________________________________________
C
C* Section 5. File now open with read access.
C _______________________________________________________
C
500 CONTINUE
C
C Allocate memory for the file and read it into memory
C
ISIZE = (KTRUNC+1)*(KTRUNC+4)*(NINT(90.0/PBUILD)+1)/2
IF( ISIZE.GT.NISIZE6 ) THEN
CALL JMEMHAN( 6, IALEG, ISIZE, 1, KRET)
IF( KRET.NE.0 ) THEN
CALL INTLOG(JP_FATAL,'JOPNLLF: memory allocation error',IALEG)
KRET = JPROUTINE + 7
GOTO 990
ENDIF
NISIZE6 = ISIZE
ENDIF
C
CALL PBREAD3(NUNIT, ALEG, (ISIZE*NPBYTES), IRET)
IF( IRET.NE.(ISIZE*NPBYTES) ) THEN
CALL INTLOG(JP_FATAL,'JOPNLLF: PBREAD3 error.',IRET)
KRET = JPROUTINE + 8
GOTO 990
ENDIF
C
C The file is no longer required
C
CALL PBCLOSE3( NUNIT, IRET)
IF ( IRET .NE. 0 ) THEN
CALL INTLOG(JP_FATAL,'JOPNLLF: PBCLOSE3 error.',IRET)
NUNIT = 0
KRET = JPROUTINE + 9
GOTO 990
ENDIF
NUNIT=0
C
KUNIT = NUNIT
YOLDLL = YPFN
C
C _______________________________________________________
C
C* Section 9. Return to calling routine. Format statements
C _______________________________________________________
C
900 CONTINUE
C
KRET = 0
C
990 CONTINUE
C
RETURN
END
|
