swig/Lib/python/argcargv.i

/* ------------------------------------------------------------
 * --- Argc & Argv ---
 * ------------------------------------------------------------ */

%fragment("SWIG_AsArgcArgv","header",
	  fragment="SWIG_AsCharPtr") %{
SWIGINTERN char**
  SWIG_AsArgcArgv(PyObject* input,
		  swig_type_info* ppchar_info,
		  size_t* argc, int* owner)
{  
  char **argv = 0;
  size_t i = 0;
  if (SWIG_ConvertPtr(input, (void **)&argv, ppchar_info, 0) == -1) {
    PyErr_Clear();
    int list = PyList_Check(input);
    if (list || PyTuple_Check(input)) {
      *argc = list ? PyList_Size(input) : PyTuple_Size(input);
      argv = SWIG_new_array(*argc + 1, char*);
      *owner = 1;
      for (; i < *argc; ++i) {
	PyObject *obj = list ? PyList_GetItem(input,i) : PyTuple_GetItem(input,i);
	if (!SWIG_AsCharPtr(obj, &(argv[i]))) {
	  PyErr_Clear();
	  PyErr_SetString(PyExc_TypeError,"list or tuple must contain strings only");
	}
      }
      argv[i] = 0;
      return argv;
    } else {
      *argc = 0;
      PyErr_SetString(PyExc_TypeError,"a list or tuple is expected");
      return 0;
    }
  } else {
    /* seems dangerous, but the user asked for it... */
    while (argv[i] != 0) ++i;
    *argc = i;
    owner = 0;
    return argv;
  }
}
%}

/*
  This typemap works with either a char**, a python list or a python
  tuple
 */

%typemap(in,fragment="SWIG_AsArgcArgv") (int ARGC, char **ARGV)
  (int owner) {
  size_t argc = 0;
  char **argv = SWIG_AsArgcArgv($input, $descriptor(char**), &argc, &owner);
  if (PyErr_Occurred()) { 
    $1 = 0; $2 = 0;
    if (SWIG_arg_fail($argnum)) SWIG_fail;
  } else {  
    $1 = ($1_ltype) argc;
    $2 = ($2_ltype) argv;
  }
}

%typemap(freearg) (int ARGC, char **ARGV)  {
  if (owner$argnum) SWIG_delete_array($2);
}