#ifdef NDEBUGstatic void debug(const char *errstr, ...) { }static void print_packet(const char *prefix, Packet *pkt) { }#else static void debug(const char *errstr, ...) {	va_list ap;	va_start(ap, errstr);	vfprintf(stderr, errstr, ap);	va_end(ap);} static void print_packet(const char *prefix, Packet *pkt) {	static const char *msgtype[] = {		[MSG_CONTENT] = "CONTENT",		[MSG_ATTACH]  = "ATTACH",		[MSG_DETACH]  = "DETACH",		[MSG_RESIZE]  = "RESIZE",		[MSG_EXIT]    = "EXIT",		[MSG_PID]     = "PID",	};	const char *type = "UNKNOWN";	if (pkt->type < countof(msgtype) && msgtype[pkt->type])		type = msgtype[pkt->type]; 	fprintf(stderr, "%s: %s ", prefix, type);	switch (pkt->type) {	case MSG_CONTENT:		fwrite(pkt->u.msg, pkt->len, 1, stderr);		break;	case MSG_RESIZE:		fprintf(stderr, "%"PRIu16"x%"PRIu16, pkt->u.ws.cols, pkt->u.ws.rows);		break;	case MSG_ATTACH:		fprintf(stderr, "readonly: %d low-priority: %d",			pkt->u.i & CLIENT_READONLY,			pkt->u.i & CLIENT_LOWPRIORITY);		break;	case MSG_EXIT:		fprintf(stderr, "status: %"PRIu32, pkt->u.i);		break;	case MSG_PID:		fprintf(stderr, "pid: %"PRIu32, pkt->u.i);		break;	default:		fprintf(stderr, "len: %"PRIu32, pkt->len);		break;	}	fprintf(stderr, "\n");} #endif /* NDEBUG */