%module PyRealpath

%{
#include <stdlib.h>

char *pyrealpath(const char* file_name)
{
   static char real_name[PATH_MAX+1];
   return realpath(file_name, real_name);
}
%}

%typemap(python, in) char* { 
    if ($source == Py_None) {
        $target = 0;
    } else if (!PyString_Check($source)) {
            PyErr_SetString(PyExc_TypeError, "not a string");
            return NULL;
    } else $target = PyString_AsString($source);
}

%typemap(python, out) char * {
    $target = Py_BuildValue("s", $source);
}

char *pyrealpath(const char* file_name);