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|
use std::{
fmt,
os::unix::io::{IntoRawFd, RawFd},
};
use nix::unistd::close;
use quick_error::quick_error;
quick_error! {
#[derive(Debug)]
pub enum FuseError {
Io(err: std::io::Error) { from() }
ProtocolInit { display("fuse handshake failed (ancient kernel?)") }
Truncated { display("fuse request truncated") }
BadOpcode { display("unknown fuse operation") }
BadLength { display("bad length in fuse request") }
ShortWrite { display("fuse reply was trimmed on write()") }
}
}
pub type FuseResult<T> = Result<T, FuseError>;
pub struct DumbFd(pub RawFd);
pub struct OutputChain<'a> {
segments: &'a [&'a [u8]],
then: Option<&'a OutputChain<'a>>,
}
pub struct OutputChainIter<'a>(Option<&'a OutputChain<'a>>);
impl IntoRawFd for DumbFd {
fn into_raw_fd(self) -> RawFd {
let fd = self.0;
std::mem::forget(self);
fd
}
}
impl Drop for DumbFd {
fn drop(&mut self) {
let _ = close(self.0);
}
}
impl<'a> OutputChain<'a> {
pub fn empty() -> Self {
OutputChain {
segments: &[],
then: None,
}
}
pub fn tail(segments: &'a [&'a [u8]]) -> Self {
OutputChain {
segments,
then: None,
}
}
pub fn preceded(&'a self, segments: &'a [&'a [u8]]) -> Self {
OutputChain {
segments,
then: Some(self),
}
}
pub fn iter(&self) -> OutputChainIter<'_> {
OutputChainIter(Some(self))
}
}
impl<'a> Iterator for OutputChainIter<'a> {
type Item = &'a [&'a [u8]];
fn next(&mut self) -> Option<Self::Item> {
let next = self.0.and_then(|chain| chain.then);
std::mem::replace(&mut self.0, next).map(|chain| chain.segments)
}
}
pub fn display_or<'a, T: fmt::Display + 'a>(
maybe: Option<T>,
default: &'a str,
) -> impl fmt::Display + 'a {
struct Params<'a, T: fmt::Display>(Option<T>, &'a str);
impl<T: fmt::Display> fmt::Display for Params<'_, T> {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
let Params(maybe, placeholder) = &self;
if let Some(t) = maybe {
write!(fmt, "{}", t)
} else {
fmt.write_str(placeholder)
}
}
}
Params(maybe, default)
}
|
