Struct std::ffi::OsString

pub struct OsString { /* fields omitted */ }

A type that can represent owned, mutable platform-native strings, but is cheaply inter-convertible with Rust strings.

The need for this type arises from the fact that:

• On Unix systems, strings are often arbitrary sequences of non-zero bytes, in many cases interpreted as UTF-8.

• On Windows, strings are often arbitrary sequences of non-zero 16-bit values, interpreted as UTF-16 when it is valid to do so.

• In Rust, strings are always valid UTF-8, but may contain zeros.

OsString and OsStr bridge this gap by simultaneously representing Rust and platform-native string values, and in particular allowing a Rust string to be converted into an "OS" string with no cost.

Methods

impl OsString

fn new() -> OsString

Constructs a new empty OsString.

fn as_os_str(&self) -> &OsStr

Converts to an OsStr slice.

fn into_string(self) -> Result<String, OsString>

Converts the OsString into a String if it contains valid Unicode data.

On failure, ownership of the original OsString is returned.

fn push<T: AsRef<OsStr>>(&mut self, s: T)

Extends the string with the given &OsStr slice.

fn with_capacity(capacity: usize) -> OsString

Creates a new OsString with the given capacity.

The string will be able to hold exactly capacity lenth units of other OS strings without reallocating. If capacity is 0, the string will not allocate.

See main OsString documentation information about encoding.

fn clear(&mut self)

Truncates the OsString to zero length.

fn capacity(&self) -> usize

Returns the capacity this OsString can hold without reallocating.

See OsString introduction for information about encoding.

fn reserve(&mut self, additional: usize)

Reserves capacity for at least additional more capacity to be inserted in the given OsString.

The collection may reserve more space to avoid frequent reallocations.

fn reserve_exact(&mut self, additional: usize)

Reserves the minimum capacity for exactly additional more capacity to be inserted in the given OsString. Does nothing if the capacity is already sufficient.

Note that the allocator may give the collection more space than it requests. Therefore capacity can not be relied upon to be precisely minimal. Prefer reserve if future insertions are expected.

Methods from Deref<Target=OsStr>

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.

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.

fn to_os_string(&self) -> OsString

Copies the slice into an owned OsString.

fn is_empty(&self) -> bool

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());

fn len(&self) -> usize

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);

Trait Implementations

impl Clone for OsString

fn clone(&self) -> OsString

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl From<String> for OsString

fn from(s: String) -> OsString

Performs the conversion.

impl<'a, T: ?Sized + AsRef<OsStr>> From<&'a T> for OsString

fn from(s: &'a T) -> OsString

Performs the conversion.

impl Index<RangeFull> for OsString

type Output = OsStr

The returned type after indexing

fn index(&self, _index: RangeFull) -> &OsStr

The method for the indexing (container[index]) operation

impl Deref for OsString

type Target = OsStr

The resulting type after dereferencing

fn deref(&self) -> &OsStr

The method called to dereference a value

impl Default for OsString

fn default() -> OsString

Constructs an empty OsString.

impl Debug for OsString

fn fmt(&self, formatter: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl PartialEq for OsString

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

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

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

This method tests for !=.

impl PartialEq<str> for OsString

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

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

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

This method tests for !=.

impl Eq for OsString

impl PartialOrd for OsString

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

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

fn lt(&self, other: &OsString) -> bool

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

fn le(&self, other: &OsString) -> bool

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

fn gt(&self, other: &OsString) -> bool

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

fn ge(&self, other: &OsString) -> bool

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

impl PartialOrd<str> for OsString

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

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

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

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

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

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

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

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

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

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

impl Ord for OsString

fn cmp(&self, other: &OsString) -> Ordering

This method returns an Ordering between self and other.

impl Hash for OsString

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

Feeds this value into the state given, updating the hasher as necessary.

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

Feeds a slice of this type into the state provided.

impl<'a, 'b> PartialEq<OsStr> for OsString

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

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

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

This method tests for !=.

impl<'a, 'b> PartialOrd<OsStr> for OsString

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

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

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

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

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

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

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

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

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

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

impl<'a, 'b> PartialEq<&'a OsStr> for OsString

fn eq(&self, other: &&'a OsStr) -> bool

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

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

This method tests for !=.

impl<'a, 'b> PartialOrd<&'a OsStr> for OsString

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

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

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

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

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

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

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

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

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

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

impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for OsString

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

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

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

This method tests for !=.

impl<'a, 'b> PartialOrd<Cow<'a, OsStr>> for OsString

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

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

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

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

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

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

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

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

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

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

impl Borrow<OsStr> for OsString

fn borrow(&self) -> &OsStr

Immutably borrows from an owned value.

impl AsRef<OsStr> for OsString

fn as_ref(&self) -> &OsStr

Performs the conversion.

impl From<PathBuf> for OsString

fn from(path_buf: PathBuf) -> OsString

Performs the conversion.

impl AsRef<Path> for OsString

fn as_ref(&self) -> &Path

Performs the conversion.

impl<'a, 'b> PartialEq<PathBuf> for OsString

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

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

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

This method tests for !=.

impl<'a, 'b> PartialOrd<PathBuf> for OsString

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

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

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

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

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

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

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

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

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

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

impl<'a, 'b> PartialEq<Path> for OsString

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

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

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

This method tests for !=.

impl<'a, 'b> PartialOrd<Path> for OsString

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

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

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

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

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

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

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

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

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

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

impl<'a, 'b> PartialEq<&'a Path> for OsString

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

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

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

This method tests for !=.

impl<'a, 'b> PartialOrd<&'a Path> for OsString

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

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

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

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

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

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

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

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

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

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

impl<'a, 'b> PartialEq<Cow<'a, Path>> for OsString

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

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

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

This method tests for !=.

impl<'a, 'b> PartialOrd<Cow<'a, Path>> for OsString

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

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

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

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

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

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

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

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

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

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

impl OsStringExt for OsString

fn from_vec(vec: Vec<u8>) -> OsString

Creates an OsString from a byte vector.

fn into_vec(self) -> Vec<u8>

Yields the underlying byte vector of this OsString.