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C*********
INTERFACE TO CHARACTER FUNCTION GETENV [C]
+ (CBUF[REFERENCE])
C---
C Allow MS-Fortran to call the GETENV function built into the
C Fortran 5.0 library.
C---
CHARACTER*1 CBUF
END
C*********
C*GRGENV -- get value of PGPLOT environment parameter (MS-DOS)
C+
SUBROUTINE GRGENV(CNAME, CVALUE, LVALUE)
CHARACTER CNAME*(*), CVALUE*(*)
INTEGER LVALUE
C
C Return the value of a PGPLOT environment parameter.
C
C Arguments:
C CNAME : (input) the name of the parameter to evaluate.
C CVALUE : 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 LVALUE : receives the number of characters in CVALUE, excluding
C trailing blanks. If the parameter is undefined, zero is
C returned.
C--
C 1990-Mar-19 - [AFT]
C-----------------------------------------------------------------------
CHARACTER GETENV*64
C
CHARACTER CTMP*64
INTEGER I, LTMP
C
CTMP = 'PGPLOT_'//CNAME
LTMP = INDEX(CTMP,' ')
IF(LTMP.EQ.0) LTMP=LEN(CTMP)-1
CTMP(LTMP:LTMP)=CHAR(0)
CTMP=GETENV(CTMP(:LTMP))
CVALUE = ' '
LVALUE = 0
C---
C MS-Fortran Kludge, if the environment variable is undefined, then
C GETENV points to NULL (memory location zero). I see no easy way to
C detect this condition in Fortran, therefore, I compare with an
C environment variable that noone would ever define and hence should
C always point at NULL.
IF(GETENV('#$%^'//CHAR(0)).EQ.CTMP) GOTO 140
DO 130 I=1,LEN(CTMP)
IF(CTMP(I:I).EQ.CHAR(0)) GOTO 140
LVALUE=LVALUE+1
CVALUE(LVALUE:LVALUE)=CTMP(I:I)
130 CONTINUE
140 CONTINUE
RETURN
END
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