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pub struct PosixCategory;
pub fn get_last_error() -> i32 {
#[cfg(not(any(target_os = "wasi", target_os = "unknown")))]
{
extern {
#[cfg(not(target_os = "dragonfly"))]
#[cfg_attr(any(target_os = "macos",
target_os = "ios",
target_os = "freebsd"),
link_name = "__error")]
#[cfg_attr(any(target_os = "openbsd",
target_os = "netbsd",
target_os = "bitrig",
target_os = "android"),
link_name = "__errno")]
#[cfg_attr(target_os = "solaris",
link_name = "___errno")]
#[cfg_attr(target_os = "linux",
link_name = "__errno_location")]
#[cfg_attr(target_os = "windows",
link_name = "_errno")]
fn errno_location() -> *mut i32;
}
return unsafe {
*(errno_location())
}
}
#[cfg(target_os = "wasi")]
{
extern {
#[thread_local]
#[link_name = "errno"]
static mut libc_errno: i32;
}
return libc_errno;
}
#[cfg(target_os = "unknown")]
{
return 0;
}
}
pub fn to_error<'a>(code: i32) -> alloc::borrow::Cow<'a, str> {
#[cfg(any(windows, all(unix, not(target_env = "gnu"))))]
extern "C" {
fn strerror(code: i32) -> *const i8;
fn strlen(text: *const i8) -> usize;
}
#[cfg(all(unix, target_env = "gnu"))]
extern "C" {
fn strerror_l(code: i32, locale: *mut i8) -> *const i8;
fn strlen(text: *const i8) -> usize;
}
#[cfg(all(unix, target_env = "gnu"))]
#[inline]
unsafe fn strerror(code: i32) -> *const i8 {
strerror_l(code, core::ptr::null_mut())
}
#[cfg(any(windows, unix))]
{
let err = unsafe {
strerror(code)
};
if !err.is_null() {
let err_slice = unsafe {
core::slice::from_raw_parts(err as *const u8, strlen(err))
};
match core::str::from_utf8(err_slice) {
Ok(res) => return res.into(),
Err(_) => (),
}
}
}
alloc::borrow::Cow::Borrowed(crate::UNKNOWN_ERROR)
}
impl crate::Category for PosixCategory {
const NAME: &'static str = "Posix error";
#[inline]
fn message<'a>(code: i32) -> alloc::borrow::Cow<'a, str> {
to_error(code)
}
}