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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
extern crate libc;
use std::io;
macro_rules! try_or {
($val:expr, $or:expr) => {
match $val {
Ok(v) => v,
Err(e) => {
return $or(e);
}
}
};
}
pub trait Signed {
fn is_negative(&self) -> bool;
}
impl Signed for i32 {
fn is_negative(&self) -> bool {
*self < (0 as i32)
}
}
impl Signed for usize {
fn is_negative(&self) -> bool {
(*self as isize) < (0 as isize)
}
}
#[cfg(any(target_os = "linux"))]
pub fn from_unix_result<T: Signed>(rv: T) -> io::Result<T> {
if rv.is_negative() {
let errno = unsafe { *libc::__errno_location() };
Err(io::Error::from_raw_os_error(errno))
} else {
Ok(rv)
}
}
#[cfg(any(target_os = "freebsd"))]
pub fn from_unix_result<T: Signed>(rv: T) -> io::Result<T> {
if rv.is_negative() {
let errno = unsafe { *libc::__error() };
Err(io::Error::from_raw_os_error(errno))
} else {
Ok(rv)
}
}
#[cfg(any(target_os = "openbsd"))]
pub fn from_unix_result<T: Signed>(rv: T) -> io::Result<T> {
if rv.is_negative() {
Err(io::Error::last_os_error())
} else {
Ok(rv)
}
}
pub fn io_err(msg: &str) -> io::Error {
io::Error::new(io::ErrorKind::Other, msg)
}
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