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use std::ffi::CString;
pub struct DlDescription(pub(crate) CString);
impl std::fmt::Debug for DlDescription {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
std::fmt::Debug::fmt(&self.0, f)
}
}
pub struct WindowsError(pub(crate) std::io::Error);
impl std::fmt::Debug for WindowsError {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
std::fmt::Debug::fmt(&self.0, f)
}
}
#[derive(Debug)]
#[non_exhaustive]
pub enum Error {
/// The `dlopen` call failed.
DlOpen { desc: DlDescription },
/// The `dlopen` call failed and system did not report an error.
DlOpenUnknown,
/// The `dlsym` call failed.
DlSym { desc: DlDescription },
/// The `dlsym` call failed and system did not report an error.
DlSymUnknown,
/// The `dlclose` call failed.
DlClose { desc: DlDescription },
/// The `dlclose` call failed and system did not report an error.
DlCloseUnknown,
/// The `LoadLibraryW` call failed.
LoadLibraryW { source: WindowsError },
/// The `LoadLibraryW` call failed and system did not report an error.
LoadLibraryWUnknown,
/// The `GetProcAddress` call failed.
GetProcAddress { source: WindowsError },
/// The `GetProcAddressUnknown` call failed and system did not report an error.
GetProcAddressUnknown,
/// The `FreeLibrary` call failed.
FreeLibrary { source: WindowsError },
/// The `FreeLibrary` call failed and system did not report an error.
FreeLibraryUnknown,
/// The requested type cannot possibly work.
IncompatibleSize,
/// Could not create a new CString.
CreateCString { source: std::ffi::NulError },
/// Could not create a new CString from bytes with trailing null.
CreateCStringWithTrailing { source: std::ffi::FromBytesWithNulError },
}
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
use Error::*;
match *self {
CreateCString { ref source } => Some(source),
CreateCStringWithTrailing { ref source } => Some(source),
LoadLibraryW { ref source } => Some(&source.0),
GetProcAddress { ref source } => Some(&source.0),
FreeLibrary { ref source } => Some(&source.0),
_ => None,
}
}
}
impl std::fmt::Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
use Error::*;
match *self {
DlOpen { ref desc } => write!(f, "{}", desc.0.to_string_lossy()),
DlOpenUnknown => write!(f, "dlopen failed, but system did not report the error"),
DlSym { ref desc } => write!(f, "{}", desc.0.to_string_lossy()),
DlSymUnknown => write!(f, "dlsym failed, but system did not report the error"),
DlClose { ref desc } => write!(f, "{}", desc.0.to_string_lossy()),
DlCloseUnknown => write!(f, "dlclose failed, but system did not report the error"),
LoadLibraryW { .. } => write!(f, "LoadLibraryW failed"),
LoadLibraryWUnknown =>
write!(f, "LoadLibraryW failed, but system did not report the error"),
GetProcAddress { .. } => write!(f, "GetProcAddress failed"),
GetProcAddressUnknown =>
write!(f, "GetProcAddress failed, but system did not report the error"),
FreeLibrary { .. } => write!(f, "FreeLibrary failed"),
FreeLibraryUnknown =>
write!(f, "FreeLibrary failed, but system did not report the error"),
CreateCString { .. } => write!(f, "could not create a C string from bytes"),
CreateCStringWithTrailing { .. } =>
write!(f, "could not create a C string from bytes with trailing null"),
IncompatibleSize => write!(f, "requested type cannot possibly work"),
}
}
}
#[cfg(test)]
mod tests {
#[test]
fn error_send() {
fn assert_send<T: Send>() {}
assert_send::<super::Error>();
}
#[test]
fn error_sync() {
fn assert_sync<T: Sync>() {}
assert_sync::<super::Error>();
}
#[test]
fn error_display() {
fn assert_display<T: std::fmt::Display>() {}
assert_display::<super::Error>();
}
}
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