[plt-scheme] More PLT-Scheme 402 extension

Hi all,

Two little questions:
- What is concept behind the naming convention for the 
libmred3m_6m5fio.dll file? What is 6, m, 5, f, i, o?
- Another question is related to probably the immutable lists.
I want to pass a "normal" list to a function defined in an
extension. However I have a problem with SCHEME_PAIRP. 
Is anything wrong in the code snippet below? Maybe the 
extension receives some other kind of list?

Thanks for the help,

Best regards,

Peter Ivanyi


static void get_coord(Scheme_Object **argv, int iarg, double
*coord)
{
  Scheme_Object *coord_car;
  Scheme_Object *coord_cdr;
  int            icoord;
  
  coord_cdr = argv[iarg];
  
  for(icoord = 0; icoord < 3; icoord++)
  {
    /* this check does not work in 402 ???? */
    if(!SCHEME_PAIRP(coord_cdr))
    {
      scheme_signal_error("e2curve: arg %d: must be a 3
element list", iarg+1);
    }

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