-const char *program_name;
-
-static void usage() {
- fprintf(stderr, "Usage: %s [options] my_ed25519_key_file his_ed25519_key_file [host] port\n\n", program_name);
- fprintf(stderr, "Valid options are:\n"
+static void usage(void) {
+ static const char *message =
+ "Usage: %s [options] my_ed25519_key_file his_ed25519_key_file [host] port\n"
+ "\n"
+ "Valid options are:\n"