Fortran character strings

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Subject: Fortran character strings
From: Prof Brian Ripley (ripley@stats.ox.ac.uk)
Date: Mon 06 Sep 1999 - 22:54:37 EST


Message-Id: <199909061254.NAA00597@toucan.stats.ox.ac.uk>

Has anyone ever successfully used Fortran character strings with R?

?Foreign says

         R C Fortran
      integer int * integer
  ....
      character char ** [compiler dependent]

     Character strings are passed as C arrays of character
     strings to Fortran: the first string may be usable if
     its length is passed separately.

and I have been taking a look. The linkage sends char ** to Fortran.
On the other hand, INTPR and DBLEPR assume Fortran character strings
are char *. On all my systems DBLEPR works and .Fortran does not,
but I do know of one compiler (Watcom Fortran for Windows NT) where the
linkage really is equivalent to char **.

Fortran in S takes the first string in a character vector and passes that as
char * (except on the Watcom-compiled Windows version), as far as I
can deduce without the source code.

I think we should either ban character strings in .Fortran or follow
the S prototype unless someone has a way around this. With different
compilers on the same platform having different conventions whatever we
do (except a ban) will be compiler-dependent.

Any suggestions?

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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