heveanly 0.1.0

C is the heavenly option
Documentation 
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use core::fmt;
use core::num::{NonZeroI32, NonZeroI64, NonZeroIsize};

use crate::errno::EINTR;
use crate::Errno;

impl From<Errno> for i32 {
   #[inline(always)]
   fn from(ec: Errno) -> i32 {
      ec.get()
   }
}

impl From<Errno> for NonZeroI32 {
   #[inline(always)]
   fn from(ec: Errno) -> Self {
      ec.get_nonzero()
   }
}

impl From<Errno> for i64 {
   #[inline(always)]
   fn from(ec: Errno) -> Self {
      ec.get() as u32 as Self
   }
}

impl From<Errno> for NonZeroI64 {
   #[inline(always)]
   fn from(ec: Errno) -> Self {
      unsafe { Self::new_unchecked(ec.get() as u32 as i64) }
   }
}

impl fmt::Binary for Errno {
   #[inline(always)]
   fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
      self.get().fmt(fmt)
   }
}

impl fmt::LowerHex for Errno {
   #[inline(always)]
   fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
      self.get().fmt(fmt)
   }
}

impl fmt::UpperHex for Errno {
   #[inline(always)]
   fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
      self.get().fmt(fmt)
   }
}

impl PartialEq<i32> for Errno {
   #[inline(always)]
   fn eq(&self, other: &i32) -> bool {
      self.get() == *other
   }
}

impl PartialEq<Errno> for i32 {
   #[inline(always)]
   fn eq(&self, other: &Errno) -> bool {
      *self == other.get()
   }
}

impl PartialEq<NonZeroI32> for Errno {
   #[inline(always)]
   fn eq(&self, other: &NonZeroI32) -> bool {
      self.get() == other.get()
   }
}

impl PartialEq<Errno> for NonZeroI32 {
   #[inline(always)]
   fn eq(&self, other: &Errno) -> bool {
      self.get() == other.get()
   }
}

impl PartialEq<i64> for Errno {
   #[inline(always)]
   fn eq(&self, other: &i64) -> bool {
      self.get() as u32 as i64 == *other
   }
}

impl PartialEq<Errno> for i64 {
   #[inline(always)]
   fn eq(&self, other: &Errno) -> bool {
      *self == other.get() as u32 as i64
   }
}

impl PartialEq<NonZeroI64> for Errno {
   #[inline(always)]
   fn eq(&self, other: &NonZeroI64) -> bool {
      self.get() as u32 as i64 == other.get()
   }
}

impl PartialEq<Errno> for NonZeroI64 {
   #[inline(always)]
   fn eq(&self, other: &Errno) -> bool {
      self.get() == other.get() as u32 as i64
   }
}

impl PartialEq<isize> for Errno {
   #[inline(always)]
   fn eq(&self, other: &isize) -> bool {
      self.get() as u32 as isize == *other
   }
}

impl PartialEq<Errno> for isize {
   #[inline(always)]
   fn eq(&self, other: &Errno) -> bool {
      *self == other.get() as u32 as isize
   }
}

impl PartialEq<NonZeroIsize> for Errno {
   #[inline(always)]
   fn eq(&self, other: &NonZeroIsize) -> bool {
      self.get() as u32 as isize == other.get()
   }
}

impl PartialEq<Errno> for NonZeroIsize {
   #[inline(always)]
   fn eq(&self, other: &Errno) -> bool {
      self.get() == other.get() as u32 as isize
   }
}

#[cfg(feature = "std")]
impl From<Errno> for std::io::Error {
   #[inline(always)]
   fn from(ec: Errno) -> Self {
      Self::from_raw_os_error(ec.get())
   }
}

pub fn retry_eintr<T>(mut f: impl FnMut() -> Result<T, Errno>) -> Result<T, Errno> {
   loop {
      match f() {
         Err(EINTR) => continue,
         r => return r,
      }
   }
}