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// Copyright 2019 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use libc::c_ulong;
use remain::sorted;
use std::fmt::{self, Display};
use std::io;
use std::num;
#[sorted]
#[derive(Debug)]
pub enum Error {
DescriptorParse,
DescriptorRead(io::Error),
FdCloneFailed(io::Error),
InvalidActualLength(num::TryFromIntError),
InvalidBufferLength(num::TryFromIntError),
IoctlFailed(c_ulong, sys_util::Error),
NoDevice,
NoSuchDescriptor,
RcGetMutFailed,
RcUnwrapFailed,
TransferAlreadyCompleted,
}
impl Display for Error {
#[remain::check]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use self::Error::*;
#[sorted]
match self {
DescriptorParse => write!(f, "parsing descriptors failed"),
DescriptorRead(e) => write!(f, "reading descriptors from device failed: {}", e),
FdCloneFailed(e) => write!(f, "File::try_clone() failed: {}", e),
InvalidActualLength(e) => write!(f, "invalid actual_length in URB: {}", e),
InvalidBufferLength(e) => write!(f, "invalid transfer buffer length: {}", e),
IoctlFailed(nr, e) => write!(f, "USB ioctl 0x{:x} failed: {}", nr, e),
NoDevice => write!(f, "Device has been removed"),
NoSuchDescriptor => write!(f, "Requested descriptor not found"),
RcGetMutFailed => write!(f, "Rc::get_mut failed"),
RcUnwrapFailed => write!(f, "Rc::try_unwrap failed"),
TransferAlreadyCompleted => write!(f, "attempted to cancel already-completed transfer"),
}
}
}
pub type Result<T> = std::result::Result<T, Error>;
impl std::error::Error for Error {}
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