HelenOS sources

USB_HID_ITEM_SIZE  376 uspace/lib/usbhid/src/hiddescriptor.c 			if ((i + USB_HID_ITEM_SIZE(data[i])) >= size) {
USB_HID_ITEM_SIZE  381 uspace/lib/usbhid/src/hiddescriptor.c 			item_size = USB_HID_ITEM_SIZE(data[i]);
USB_HID_ITEM_SIZE  499 uspace/lib/usbhid/src/hiddescriptor.c 			i += 1 + USB_HID_ITEM_SIZE(data[i]);
USB_HID_ITEM_SIZE  502 uspace/lib/usbhid/src/hiddescriptor.c 			i += 3 + USB_HID_ITEM_SIZE(data[i + 1]);
HelenOS homepage, sources at GitHub