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C*GRGENV -- get value of PGPLOT environment parameter (VMS)
C+
SUBROUTINE GRGENV(NAME, VALUE, L)
CHARACTER*(*) NAME, VALUE
INTEGER L
C
C Return the value of a PGPLOT environment parameter. In VMS,
C environment parameters are VMS logical names; e.g. parameter
C ENVOPT is logical name PGPLOT_ENVOPT. Translation is not
C recursive and is case-sensitive.
C [For historical compatibility, if name PGPLOT_XX is not found,
C this routine will also look for PLT$XX.]
C
C Arguments:
C NAME : (input) the name of the parameter to evaluate.
C VALUE : receives the value of the parameter, truncated or extended
C with blanks as necessary. If the parameter is undefined,
C a blank string is returned.
C L : receives the number of characters in VALUE, excluding
C trailing blanks. If the parameter is undefined, zero is
C returned.
C--
C 19-Jan-1988
C-----------------------------------------------------------------------
INTEGER I, LIN, IER, LIB$SYS_TRNLOG
CHARACTER*32 TEST
C
TEST = 'PGPLOT_'//NAME
LIN = INDEX(TEST, ' ')-1
IER = LIB$SYS_TRNLOG(TEST(:LIN),L,VALUE)
IF (IER.NE.1) THEN
TEST = 'PLT$'//NAME
LIN = INDEX(TEST, ' ')-1
IER = LIB$SYS_TRNLOG(TEST(:LIN),L,VALUE)
END IF
IF (IER.NE.1 .OR. L.LT.1 .OR. VALUE.EQ.' ') THEN
L = 0
VALUE = ' '
ELSE
DO 10 I=L,1,-1
L = I
IF (VALUE(I:I).NE.' ') GOTO 20
10 CONTINUE
L = 0
20 CONTINUE
END IF
END
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