std::ffi::OsStr - Rust
Description: API documentation for the Rust `OsStr` struct in crate `std`.
Keywords: rust, rustlang, rust-lang, OsStr

# Struct std::ffi::OsStr 1.0.0 [−] [src]

    pub struct OsStr { /* fields omitted */ }

Slices into OS strings (see `OsString`).

## Methods

### `impl OsStr`
[src]

#### `fn new<S: AsRef<OsStr> + ?Sized>(s: &S) -> &OsStr`

Coerces into an `OsStr` slice.

# Examples

    use std::ffi::OsStr;

    let os_str = OsStr::new("foo");Run

#### `fn to_str(&self) -> Option<&str>`

Yields a `&str` slice if the `OsStr` is valid Unicode.

This conversion may entail doing a check for UTF-8 validity.

# Examples

    use std::ffi::OsStr;

    let os_str = OsStr::new("foo");
    assert_eq!(os_str.to_str(), Some("foo"));Run

#### `fn to_string_lossy(&self) -> Cow<str>`

Converts an `OsStr` to a `Cow``<``str``>`.

Any non-Unicode sequences are replaced with U+FFFD REPLACEMENT CHARACTER.

# Examples

Calling `to_string_lossy` on an `OsStr` with valid unicode:

    use std::ffi::OsStr;

    let os_str = OsStr::new("foo");
    assert_eq!(os_str.to_string_lossy(), "foo");Run

Had `os_str` contained invalid unicode, the `to_string_lossy` call might have returned `"fo�"`.

#### `fn to_os_string(&self) -> OsString`

Copies the slice into an owned `OsString`.

# Examples

    use std::ffi::{OsStr, OsString};

    let os_str = OsStr::new("foo");
    let os_string = os_str.to_os_string();
    assert_eq!(os_string, OsString::from("foo"));Run

#### `fn is_empty(&self) -> bool`
1.9.0

Checks whether the `OsStr` is empty.

# Examples

    use std::ffi::OsStr;

    let os_str = OsStr::new("");
    assert!(os_str.is_empty());

    let os_str = OsStr::new("foo");
    assert!(!os_str.is_empty());Run

#### `fn len(&self) -> usize`
1.9.0

Returns the length of this `OsStr`.

Note that this does not return the number of bytes in this string as, for example, OS strings on Windows are encoded as a list of `u16` rather than a list of bytes. This number is simply useful for passing to other methods like `OsString::with_capacity` to avoid reallocations.

See `OsStr` introduction for more information about encoding.

# Examples

    use std::ffi::OsStr;

    let os_str = OsStr::new("");
    assert_eq!(os_str.len(), 0);

    let os_str = OsStr::new("foo");
    assert_eq!(os_str.len(), 3);Run

#### `fn into_os_string(self: Box<OsStr>) -> OsString`
1.20.0

Converts a `Box``<OsStr>` into an `OsString` without copying or allocating.

## Trait Implementations

### `impl<'a> Default for &'a OsStr`
1.9.0
[src]

#### `fn default() -> &'a OsStr`

Creates an empty `OsStr`.

### `impl PartialEq for OsStr`
[src]

#### `fn eq(&self, other: &OsStr) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl PartialEq<str> for OsStr`
[src]

#### `fn eq(&self, other: &str) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl Eq for OsStr`
[src]

### `impl PartialOrd for OsStr`
[src]

#### `fn partial_cmp(&self, other: &OsStr) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &OsStr) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &OsStr) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &OsStr) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &OsStr) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl PartialOrd<str> for OsStr`
[src]

#### `fn partial_cmp(&self, other: &str) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl Ord for OsStr`
[src]

#### `fn cmp(&self, other: &OsStr) -> Ordering`

This method returns an `Ordering` between `self` and `other`. Read more

#### `fn max(self, other: Self) -> Self`

🔬 This is a nightly-only experimental API. (`ord_max_min` #25663)

Compares and returns the maximum of two values. Read more

#### `fn min(self, other: Self) -> Self`

🔬 This is a nightly-only experimental API. (`ord_max_min` #25663)

Compares and returns the minimum of two values. Read more

### `impl<'a, 'b> PartialEq<OsString> for OsStr`
1.8.0
[src]

#### `fn eq(&self, other: &OsString) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl<'a, 'b> PartialOrd<OsString> for OsStr`
1.8.0
[src]

#### `fn partial_cmp(&self, other: &OsString) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl<'a, 'b> PartialEq<OsString> for &'a OsStr`
1.8.0
[src]

#### `fn eq(&self, other: &OsString) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl<'a, 'b> PartialOrd<OsString> for &'a OsStr`
1.8.0
[src]

#### `fn partial_cmp(&self, other: &OsString) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for OsStr`
1.8.0
[src]

#### `fn eq(&self, other: &Cow<'a, OsStr>) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl<'a, 'b> PartialOrd<Cow<'a, OsStr>> for OsStr`
1.8.0
[src]

#### `fn partial_cmp(&self, other: &Cow<'a, OsStr>) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for &'b OsStr`
1.8.0
[src]

#### `fn eq(&self, other: &Cow<'a, OsStr>) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl<'a, 'b> PartialOrd<Cow<'a, OsStr>> for &'b OsStr`
1.8.0
[src]

#### `fn partial_cmp(&self, other: &Cow<'a, OsStr>) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl Hash for OsStr`
[src]

#### `fn hash<H: Hasher>(&self, state: &mut H)`

Feeds this value into the given [`Hasher`]. Read more

#### `fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,`
1.3.0

Feeds a slice of this type into the given [`Hasher`]. Read more

### `impl Debug for OsStr`
[src]

#### `fn fmt(&self, formatter: &mut Formatter) -> Result`

Formats the value using the given formatter.

### `impl ToOwned for OsStr`
[src]

#### `type Owned = OsString`

#### `fn to_owned(&self) -> OsString`

Creates owned data from borrowed data, usually by cloning. Read more

#### `fn clone_into(&self, target: &mut OsString)`

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

### `impl AsRef<OsStr> for OsStr`
[src]

#### `fn as_ref(&self) -> &OsStr`

Performs the conversion.

### `impl AsRef<Path> for OsStr`
[src]

#### `fn as_ref(&self) -> &Path`

Performs the conversion.

### `impl<'a, 'b> PartialEq<PathBuf> for OsStr`
1.8.0
[src]

#### `fn eq(&self, other: &PathBuf) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl<'a, 'b> PartialOrd<PathBuf> for OsStr`
1.8.0
[src]

#### `fn partial_cmp(&self, other: &PathBuf) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl<'a, 'b> PartialEq<PathBuf> for &'a OsStr`
1.8.0
[src]

#### `fn eq(&self, other: &PathBuf) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl<'a, 'b> PartialOrd<PathBuf> for &'a OsStr`
1.8.0
[src]

#### `fn partial_cmp(&self, other: &PathBuf) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl<'a, 'b> PartialEq<Path> for OsStr`
1.8.0
[src]

#### `fn eq(&self, other: &Path) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl<'a, 'b> PartialOrd<Path> for OsStr`
1.8.0
[src]

#### `fn partial_cmp(&self, other: &Path) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl<'a, 'b> PartialEq<Path> for &'a OsStr`
1.8.0
[src]

#### `fn eq(&self, other: &Path) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl<'a, 'b> PartialOrd<Path> for &'a OsStr`
1.8.0
[src]

#### `fn partial_cmp(&self, other: &Path) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl<'a, 'b> PartialEq<&'a Path> for OsStr`
1.8.0
[src]

#### `fn eq(&self, other: &&'a Path) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl<'a, 'b> PartialOrd<&'a Path> for OsStr`
1.8.0
[src]

#### `fn partial_cmp(&self, other: &&'a Path) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl<'a, 'b> PartialEq<Cow<'a, Path>> for OsStr`
1.8.0
[src]

#### `fn eq(&self, other: &Cow<'a, Path>) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl<'a, 'b> PartialOrd<Cow<'a, Path>> for OsStr`
1.8.0
[src]

#### `fn partial_cmp(&self, other: &Cow<'a, Path>) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl<'a, 'b> PartialEq<Cow<'a, Path>> for &'b OsStr`
1.8.0
[src]

#### `fn eq(&self, other: &Cow<'a, Path>) -> bool`

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Rhs) -> bool`

This method tests for `!=`.

### `impl<'a, 'b> PartialOrd<Cow<'a, Path>> for &'b OsStr`
1.8.0
[src]

#### `fn partial_cmp(&self, other: &Cow<'a, Path>) -> Option<Ordering>`

This method returns an ordering between `self` and `other` values if one exists. Read more

#### `fn lt(&self, other: &Rhs) -> bool`

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more

#### `fn le(&self, other: &Rhs) -> bool`

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more

#### `fn gt(&self, other: &Rhs) -> bool`

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more

#### `fn ge(&self, other: &Rhs) -> bool`

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more

### `impl OsStrExt for OsStr`
[src]

#### `fn from_bytes(slice: &[u8]) -> &OsStr`

Creates an [`OsStr`] from a byte slice. Read more

#### `fn as_bytes(&self) -> &[u8]`

Gets the underlying byte view of the [`OsStr`] slice. Read more

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