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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 JREADLL( KUNIT, KTRUNC, PBUILD, PLAT, PLEG, KRET)
C
C---->
C**** JREADLL
C
C PURPOSE
C _______
C
C This routine reads legendre functions for one latitude.
C
C INTERFACE
C _________
C
C CALL JREADLL( KUNIT, KTRUNC, PBUILD, PLAT, PLEG, KRET)
C
C Input parameters
C ________________
C
C KUNIT - Unit number for open file of legendre functions.
C KTRUNC - Truncation.
C PBUILD - Grid interval used to build legendre coefficients file
C PLAT - Latitude in degrees.
C
C Output parameters
C ________________
C
C PLEG - Array of legendre functions for the latitude.
C KRET - Return status code
C 0 = OK
C
C Common block usage
C __________________
C
C None.
C
C Method
C ______
C
C Calculate offset of the legendre functions for the latitude row
C in the file, skip to the row and read the functions.
C
C Retries the read upto 3 times if necessary
C
C Externals
C _________
C
C PBSEEK - Position the coefficients file
C PBREAD - Read the coefficients file
C INTLOG - Output log message
C INTLOGR - Output log message (with real value)
C
C Reference
C _________
C
C None.
C
C Comments
C ________
C
C Only positive latitude values are allowed.
C
C AUTHOR
C ______
C
C J.D.Chambers *ECMWF* Nov 1993
C
C MODIFICATIONS
C _____________
C
C None.
C
C----<
C _______________________________________________________
C
C
IMPLICIT NONE
#include "jparams.h"
#include "parim.h"
C
C Subroutine arguments
C
INTEGER KUNIT, KTRUNC, KRET
REAL PBUILD, PLEG, PLAT
DIMENSION PLEG(*)
C
C Parameters
INTEGER JPROUTINE
PARAMETER ( JPROUTINE = 31100 )
C
C Local variables
C
INTEGER NTRIES
INTEGER NSIZE, NRET
INTEGER*8 FSIZE, FRET
INTEGER*8 NEWPOS, OLDPOS
REAL ZLAT
DATA OLDPOS/-1/
SAVE NEWPOS, OLDPOS
C
C _______________________________________________________
C
C* Section 1. Initialization.
C _______________________________________________________
C
100 CONTINUE
IF ( PLAT .LT. 0.0 ) THEN
ZLAT = 0.0
ELSE
ZLAT = PLAT
ENDIF
C
C Calculate the byte offset into the file where the legendre
C functions for the latitude should be.
#ifdef REAL_8
NSIZE = 8 * (KTRUNC+1)*(KTRUNC+4)/2
FSIZE = 8 * (KTRUNC+1)*(KTRUNC+4)/2
#else
NSIZE = 4 * (KTRUNC+1)*(KTRUNC+4)/2
FSIZE = 4 * (KTRUNC+1)*(KTRUNC+4)/2
#endif
cs NEWPOS = NINT( (90.0 - ZLAT)/PBUILD ) * NSIZE
NEWPOS = NINT( (90.0 - ZLAT)/PBUILD ) * FSIZE
C
C _______________________________________________________
C
C* Section 2. Processing.
C _______________________________________________________
C
C Position file unless the previous read left it in the correct
C position already
C
NTRIES = 0
210 CONTINUE
NTRIES = NTRIES + 1
IF ( NEWPOS .NE. OLDPOS ) THEN
CALL PBSEEK64( KUNIT, NEWPOS, 0, FRET)
IF ( FRET .NE. NEWPOS ) THEN
CALL INTLOG(JP_ERROR,'JREADLL: PBSEEK64 error.',FRET)
KRET = JPROUTINE + 2
GOTO 990
ENDIF
ENDIF
C
C Read the legendre coefficients
CALL PBREAD( KUNIT, PLEG, NSIZE, NRET)
IF ( NRET .NE. NSIZE ) THEN
IF ( NTRIES .EQ. JPMXTRY ) THEN
CALL INTLOG(JP_ERROR,'JREADLL: PBREAD error.',NRET)
KRET = JPROUTINE + 3
GOTO 990
ELSE
GOTO 210
ENDIF
ENDIF
C
C Record the current file byte position
OLDPOS = NEWPOS + NSIZE
C _______________________________________________________
C
C* Section 9. Return to calling routine. Format statements
C _______________________________________________________
C
900 CONTINUE
KRET = 0
C
990 CONTINUE
RETURN
END
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