[SOLVED] Is there an alternative to GETCWD() in Fortran 2003-2008

Is there an alternative to GETCWD() in Fortran 2003-2008

The GNU Extension to the GNU Fortran compiler provides the subroutine GETCWD() that well, gets the current working directory. However, my code has to be portable to the ifort and nagfor compiler as well and I use F2003 features.

So, is there an alternative to GETCWD() for F2003 and later?

I have the standard here but it's quite sizeable and I've been going through it for a while now and haven't found anything useful...

Solution

You can also use the ISO_C_Binding and call the corresponding C functions:

cwd.c:

#ifdef _WIN32
/* Windows */
#include <direct.h>
#define GETCWD _getcwd

#else
/* Unix */
#include <unistd.h>
#define GETCWD getcwd

#endif

void getCurrentWorkDir( char *str, int *stat )
{
  if ( GETCWD(str, sizeof(str)) == str ) {
    *stat = 0;
  } else {
    *stat = 1;
  }
}

test.F90:

program test
 use ISO_C_Binding, only: C_CHAR, C_INT
 interface
   subroutine getCurrentWorkDir(str, stat) bind(C, name="getCurrentWorkDir")
     use ISO_C_Binding, only: C_CHAR, C_INT
     character(kind=C_CHAR),intent(out) :: str(*)
     integer(C_INT),intent(out)         :: stat
    end subroutine
  end interface
  character(len=30)   :: str
  integer(C_INT)      :: stat

  str=''
  call getCurrentWorkDir(str, stat)
  print *, stat, trim(str)

end program

This code is valid for Windows and Unix-derivates (Linux, OSX, BSD, etc. )