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42 lines
877 B
42 lines
877 B
use super::*;
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use std::{error, fmt};
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use std::ffi::CStr;
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/// A `libcow` error object.
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#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
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#[repr(transparent)]
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pub struct Error(i32);
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impl Error
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{
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/// The last error in `libcow`.
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#[inline(always)] pub fn last() -> Self
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{
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Self(unsafe {ffi::cow_err()})
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}
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}
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impl error::Error for Error{}
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impl fmt::Display for Error
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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const DEFAULT: &'static [u8] = b"unknown\0"; // must be `nul`'d
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let cstr = unsafe {
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let ptr = ffi::cow_err_msg(self.0);
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if ptr.is_null() {
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CStr::from_bytes_with_nul_unchecked(DEFAULT)
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} else {
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let ptr = *ptr;
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if ptr.is_null() {
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CStr::from_bytes_with_nul_unchecked(DEFAULT)
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} else {
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CStr::from_ptr(ptr as *const i8)
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}
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}
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};
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write!(f, "{}", cstr.to_string_lossy())
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}
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}
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