AIRES library reference: importvar.

c
c     Routine directly callable from C/C++ (it could be necessary to
c     append an underscore, "_", to its name depending on the C/C++
c     compiler used).
c
c
      subroutine importvar(varname, value, vlen)
c
c     Getting the current value of an environment variable.
c
c     Written by: S. J. Sciutto, La Plata 2001.
c
c     Arguments:
c     =========
c
c     varname......... (input, character*(*)) Name of the variable.
c     value........... (output, character*(*)) Current value, as
c                      returned by the OS with trailing blanks removed.
c                      The calling program must ensure that the
c                      maximum length of the string is enough to store
c                      the returned value.
c     vlen............ (output, integer) Length of string "value"
c                      (zero if the returned value is blank).
c
c
c<--->

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