static status_t
usb_printer_write(void *cookie, off_t position, const void *buffer,
size_t *length)
{
if (buffer == NULL || length == NULL)
return B_BAD_VALUE;
TRACE("write(%" B_PRIdOFF ", %" B_PRIuSIZE ")\n", position, *length);
printer_device *device = (printer_device *)cookie;
mutex_lock(&device->lock);
if (device->removed) {
*length = 0;
mutex_unlock(&device->lock);
return B_DEV_NOT_READY;
}
status_t result = usb_printer_transfer(device, false, (void*)buffer,
length);
mutex_unlock(&device->lock);
if (result == B_OK) {
TRACE("write successful with %" B_PRIuSIZE " bytes\n", *length);
return B_OK;
}
*length = 0;
TRACE_ALWAYS("write fails with 0x%08" B_PRIx32 "\n", result);
return result;
}
static status_t
usb_printer_read(void *cookie, off_t position, void *buffer, size_t *length)
{
if (buffer == NULL || length == NULL)
return B_BAD_VALUE;
TRACE("read(%lld, %ld)\n", position, *length);
printer_device *device = (printer_device *)cookie;
mutex_lock(&device->lock);
if (device->removed) {
*length = 0;
mutex_unlock(&device->lock);
return B_DEV_NOT_READY;
}
status_t result = usb_printer_transfer(device, true, buffer, length);
mutex_unlock(&device->lock);
if (result == B_OK) {
TRACE("read successful with %ld bytes\n", *length);
return B_OK;
}
*length = 0;
TRACE_ALWAYS("read fails with 0x%08lx\n", result);
return result;
}
