Function device_printf

freebsd/kern/subr_bus.c:2407–2436

* @brief Print the name of the device followed by a colon, a space * and the result of calling vprintf() with the value of @p fmt and * the following arguments. * * @returns the number of characters printed */

 * @returns the number of characters printed
 */
int
device_printf(device_t dev, const char * fmt, ...)
{
	char buf[128];
	struct sbuf sb;
	const char *name;
	va_list ap;
	size_t retval;

	retval = 0;

	sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN);
	sbuf_set_drain(&sb, sbuf_printf_drain, &retval);

	name = device_get_name(dev);

	if (name == NULL)
		sbuf_cat(&sb, "unknown: ");
	else
		sbuf_printf(&sb, "%s%d: ", name, device_get_unit(dev));

	va_start(ap, fmt);
	sbuf_vprintf(&sb, fmt, ap);
	va_end(ap);

	sbuf_finish(&sb);
	sbuf_delete(&sb);

	return (retval);
}

/**
 * @internal