Method to_os_error_builder

crates/vm/src/exceptions.rs:1382–1423

(&self, vm: &VirtualMachine)

impl ToOSErrorBuilder for std::io::Error {
    fn to_os_error_builder(&self, vm: &VirtualMachine) -> OSErrorBuilder {
        use crate::common::os::ErrorExt;

        let errno = self.posix_errno();
        #[cfg(windows)]
        let msg = 'msg: {
            // Use C runtime's strerror for POSIX errno values.
            // For Windows-specific error codes, fall back to FormatMessage.
            const MAX_POSIX_ERRNO: i32 = 127;
            if errno > 0 && errno <= MAX_POSIX_ERRNO {
                let ptr = unsafe { libc::strerror(errno) };
                if !ptr.is_null() {
                    let s = unsafe { core::ffi::CStr::from_ptr(ptr) }.to_string_lossy();
                    if !s.starts_with("Unknown error") {
                        break 'msg s.into_owned();
                    }
                }
            }
            self.to_string()
        };
        #[cfg(unix)]
        let msg = {
            let ptr = unsafe { libc::strerror(errno) };
            if !ptr.is_null() {
                unsafe { core::ffi::CStr::from_ptr(ptr) }
                    .to_string_lossy()
                    .into_owned()
            } else {
                self.to_string()
            }
        };
        #[cfg(not(any(windows, unix)))]
        let msg = self.to_string();

        #[allow(unused_mut)]
        let mut builder = OSErrorBuilder::with_errno(errno, msg, vm);
        #[cfg(windows)]
        if let Some(winerror) = self.raw_os_error() {
            builder = builder.winerror(winerror.to_pyobject(vm));
        }
        builder
    }
}

impl ToPyException for std::io::Error {