vendor/wasi/src/error.rs

   1 use super::Errno;
   2 use core::fmt;
   3 use core::num::NonZeroU16;
   4
   5 /// A raw error returned by wasi APIs, internally containing a 16-bit error
   6 /// code.
   7 #[derive(Copy, Clone, PartialEq, Eq, Ord, PartialOrd)]
   8 pub struct Error {
   9     code: NonZeroU16,
  10 }
  11
  12 impl Error {
  13     /// Constructs a new error from a raw error code, returning `None` if the
  14     /// error code is zero (which means success).
  15     pub fn from_raw_error(error: Errno) -> Option<Error> {
  16         Some(Error {
  17             code: NonZeroU16::new(error)?,
  18         })
  19     }
  20
  21     /// Returns the raw error code that this error represents.
  22     pub fn raw_error(&self) -> u16 {
  23         self.code.get()
  24     }
  25 }
  26
  27 impl fmt::Display for Error {
  28     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  29         write!(
  30             f,
  31             "{} (error {})",
  32             super::strerror(self.code.get()),
  33             self.code
  34         )?;
  35         Ok(())
  36     }
  37 }
  38
  39 impl fmt::Debug for Error {
  40     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  41         f.debug_struct("Error")
  42             .field("code", &self.code)
  43             .field("message", &super::strerror(self.code.get()))
  44             .finish()
  45     }
  46 }
  47
  48 #[cfg(feature = "std")]
  49 extern crate std;
  50 #[cfg(feature = "std")]
  51 impl std::error::Error for Error {}