AIRES library reference: lookforfile.

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 lookforfile(fname, pathstring, pslen, pathsep,
     +                       exists, fullname, fullnamelen)
c
c     Checking for the existence of a given file. The file is searched
c     in the patstring and current directories.
c
c     Written by: S. J. Sciutto, La Plata 1999, 2003, 2019.
c
c
c     Arguments:
c     =========
c
c     fname........... (input, character*(*)) The file name.
c     pathstring...... (input, character*(*)) Set of directories to
c                      search for the existence of the file.
c                      Directories are separated by character
c                      "pathsep".
c     pslen........... (input, integer) Length of string "pathstring".
c     pathsep......... (input, character*1) Separator character.
c     exists.......... (output, logical) True if the file is found.
c     fullname........ (output, character*(*)) Full name
c                      (directory + file name) of the file. This
c                      variable is set only when "exists" is true.
c     fullnamelen..... (output, integer) Length of "fullname". This
c                      variable is set only when "exists" is true.
c
c
c<--->

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