libjvs work-in-progress API

struct JVS_IO {
  BYTE node;
  BOOL valid;
  char ident[101];
  BYTE cmdrev, jvsrev, commver;

  struct {
    // read-only
    BOOL has;
    BYTE slots;
    WORD *count;
    // write-only
    INT16 *subtract;
  } coin;
  struct {
    // read-only
    BOOL has;
    BYTE slots;
    DWORD *count;
    // write-only
    INT16 *subtract;
  } medals;

  struct {
    // read-only
    BOOL has;
    BYTE players, buttons;
    BYTE *data;
  } sw;
  struct {
    // read-only
    BOOL has;
    BYTE channels, bits;
    WORD *data;
  } analog_in;
  struct {
    // read-only
    BOOL has;
    BYTE channels;
    WORD *data;
  } rotary;
  struct {
    // read-only
    BOOL has;
    BYTE data;
  } keycode;
  struct {
    // read-only
    BOOL has;
    BYTE channels, xbits,ybits;
    WORD *x, *y;
  } scrpos;
  struct {
    // read-only
    BOOL has;
    WORD count;
    BYTE *data;
  } miscsw;
  struct {
    // read-only
    BOOL has;
    BYTE slots;
  } cardsys;
  struct {
    // read-only
    BOOL has;
    BYTE slots;
    // write-only
    // TODO
  } general_out;
  struct {
    // read-only
    BOOL has;
    BYTE channels;
    // write-only
    WORD *data;
  } analog_out;
  struct {
    // read-only
    BOOL has;
    BYTE width,height, type;
    // write-only
    // TODO
  } char_out;
  struct {
    // read-only
    BOOL has;
  } backup;
};

int jvs_setup(LPCTSTR portname);
int jvs_shutdown();

////////////
// Helpful API
////////////
// Get number of attached I/Os
int jvs_io_count(void);
// Get JVS_IO structure for one I/O node
JVS_IO *jvs_io_get(BYTE node);
// Update JVS_IO structure for one I/O node
int jvs_io_update(BYTE node, JVS_IO *info);
// Print out the structure information
void jvs_io_dump(JVS_IO *info);