harakit/src/libstrerror.rs

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/*
* Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
* SPDX-License-Identifier: FSFAP
*
* Copying and distribution of this file, with or without modification, are
* permitted in any medium without royalty provided the copyright notice and
* this notice are preserved. This file is offered as-is, without any warranty.
*/
use std::ffi::{ c_int, c_char, CStr };
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pub trait StrError { fn strerror(&self) -> String; }
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impl StrError for std::io::Error {
/* wrapper function for use in Rust */
fn strerror(&self) -> String {
/* Get the raw OS error. If its None, what the hell is going on‽ */
let errno = self.raw_os_error().unwrap_or(0) as c_int;
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/* Get a CStr from the error message so that its referenced and then
* convert it to an owned value. If the string is not valid UTF-8,
* return that error instead. */
match unsafe { CStr::from_ptr(strerror(errno)) }.to_str() {
Ok(s) => s.to_owned(), // yay!! :D
Err(e) => e.to_string(), // awww :(
}
}
}
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/* binding to strerror(3p) */
extern "C" { fn strerror(errnum: c_int) -> *mut c_char; }