1 files changed, 83 insertions, 0 deletions
diff --git a/library/backtrace/src/types.rs b/library/backtrace/src/types.rs
new file mode 100644
index 000000000..c7e551059
--- /dev/null
+++ b/library/backtrace/src/types.rs
@@ -0,0 +1,83 @@
+//! Platform dependent types.
+
+cfg_if::cfg_if! {
+    if #[cfg(feature = "std")] {
+        use std::borrow::Cow;
+        use std::fmt;
+        use std::path::PathBuf;
+        use std::prelude::v1::*;
+        use std::str;
+    }
+}
+
+/// A platform independent representation of a string. When working with `std`
+/// enabled it is recommended to the convenience methods for providing
+/// conversions to `std` types.
+#[derive(Debug)]
+pub enum BytesOrWideString<'a> {
+    /// A slice, typically provided on Unix platforms.
+    Bytes(&'a [u8]),
+    /// Wide strings typically from Windows.
+    Wide(&'a [u16]),
+}
+
+#[cfg(feature = "std")]
+impl<'a> BytesOrWideString<'a> {
+    /// Lossy converts to a `Cow<str>`, will allocate if `Bytes` is not valid
+    /// UTF-8 or if `BytesOrWideString` is `Wide`.
+    ///
+    /// # Required features
+    ///
+    /// This function requires the `std` feature of the `backtrace` crate to be
+    /// enabled, and the `std` feature is enabled by default.
+    pub fn to_str_lossy(&self) -> Cow<'a, str> {
+        use self::BytesOrWideString::*;
+
+        match self {
+            &Bytes(slice) => String::from_utf8_lossy(slice),
+            &Wide(wide) => Cow::Owned(String::from_utf16_lossy(wide)),
+        }
+    }
+
+    /// Provides a `Path` representation of `BytesOrWideString`.
+    ///
+    /// # Required features
+    ///
+    /// This function requires the `std` feature of the `backtrace` crate to be
+    /// enabled, and the `std` feature is enabled by default.
+    pub fn into_path_buf(self) -> PathBuf {
+        #[cfg(unix)]
+        {
+            use std::ffi::OsStr;
+            use std::os::unix::ffi::OsStrExt;
+
+            if let BytesOrWideString::Bytes(slice) = self {
+                return PathBuf::from(OsStr::from_bytes(slice));
+            }
+        }
+
+        #[cfg(windows)]
+        {
+            use std::ffi::OsString;
+            use std::os::windows::ffi::OsStringExt;
+
+            if let BytesOrWideString::Wide(slice) = self {
+                return PathBuf::from(OsString::from_wide(slice));
+            }
+        }
+
+        if let BytesOrWideString::Bytes(b) = self {
+            if let Ok(s) = str::from_utf8(b) {
+                return PathBuf::from(s);
+            }
+        }
+        unreachable!()
+    }
+}
+
+#[cfg(feature = "std")]
+impl<'a> fmt::Display for BytesOrWideString<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.to_str_lossy().fmt(f)
+    }
+}