#define COMMAND(__COMMAND__, __FORMAT__, ...)
  void __COMMAND__ ( __VA_ARGS__ ) {
    printf( __FORMAT__, ##__VA_ARGS__ );
  }

COMMAND( Start,        "m start %cr", (char) unit )
COMMAND( Home,         "m homer" )
COMMAND( Add_To_Chart, "cv 0 %d %dr", (int) ch1, (int) ch2 )
// literally hundreds of additional COMMANDs needed here.

COMMAND( A, "cv 0 %d %dr", (int)ch1, (int)ch2 )
// error: expected declaration specifiers or ‘...’ before ‘(’ token
// void A ( (int)ch1, (int)ch2 ) {
//   printf( "cv 0 %d %dr", (int)ch1, (int)ch2 );
// }

COMMAND( B, "cv 0 %d %dr", int(ch1), int(ch2) )
// error: expected expression before ‘int’
// void B ( int(ch1), int(ch2) ) {
//   printf( "cv 0 %d %dr", int(ch1), int(ch2) );
// }