Struct std::ffi::OsString1.0.0 [] [src]

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:

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 if possible.

OsString is to OsStr as String is to &str: the former in each pair are owned strings; the latter are borrowed references.

Creating an OsString

From a Rust string: OsString implements From<String>, so you can use my_string.from to create an OsString from a normal Rust string.

From slices: Just like you can start with an empty Rust String and then push_str &str sub-string slices into it, you can create an empty OsString with the new method and then push string slices into it with the push method.

Extracting a borrowed reference to the whole OS string

You can use the as_os_str method to get an &OsStr from an OsString; this is effectively a borrowed reference to the whole string.

Conversions

See the [module's toplevel documentation about conversions][conversions] for a discussion on the traits which OsString implements for conversions from/to native representations.

Methods

impl OsString
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Constructs a new empty OsString.

Examples

use std::ffi::OsString;

let os_string = OsString::new();Run

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Converts to an OsStr slice.

Examples

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

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

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

On failure, ownership of the original OsString is returned.

Examples

use std::ffi::OsString;

let os_string = OsString::from("foo");
let string = os_string.into_string();
assert_eq!(string, Ok(String::from("foo")));Run

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Extends the string with the given &OsStr slice.

Examples

use std::ffi::OsString;

let mut os_string = OsString::from("foo");
os_string.push("bar");
assert_eq!(&os_string, "foobar");Run

1.9.0
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Creates a new OsString with the given capacity.

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

See main OsString documentation information about encoding.

Examples

use std::ffi::OsString;

let mut os_string = OsString::with_capacity(10);
let capacity = os_string.capacity();

// This push is done without reallocating
os_string.push("foo");

assert_eq!(capacity, os_string.capacity());Run

1.9.0
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Truncates the OsString to zero length.

Examples

use std::ffi::OsString;

let mut os_string = OsString::from("foo");
assert_eq!(&os_string, "foo");

os_string.clear();
assert_eq!(&os_string, "");Run

1.9.0
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Returns the capacity this OsString can hold without reallocating.

See OsString introduction for information about encoding.

Examples

use std::ffi::OsString;

let mut os_string = OsString::with_capacity(10);
assert!(os_string.capacity() >= 10);Run

1.9.0
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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.

Examples

use std::ffi::OsString;

let mut s = OsString::new();
s.reserve(10);
assert!(s.capacity() >= 10);Run

1.9.0
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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.

Examples

use std::ffi::OsString;

let mut s = OsString::new();
s.reserve_exact(10);
assert!(s.capacity() >= 10);Run

1.19.0
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Shrinks the capacity of the OsString to match its length.

Examples

use std::ffi::OsString;

let mut s = OsString::from("foo");

s.reserve(100);
assert!(s.capacity() >= 100);

s.shrink_to_fit();
assert_eq!(3, s.capacity());Run

1.20.0
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Converts this OsString into a boxed OsStr.

Examples

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

let s = OsString::from("hello");

let b: Box<OsStr> = s.into_boxed_os_str();Run

Methods from Deref<Target = OsStr>

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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

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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�".

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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

1.9.0
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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

1.9.0
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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

Trait Implementations

impl Clone for OsString
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Returns a copy of the value. Read more

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Performs copy-assignment from source. Read more

impl From<String> for OsString
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Performs the conversion.

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

impl Index<RangeFull> for OsString
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The returned type after indexing.

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Performs the indexing (container[index]) operation.

impl Deref for OsString
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The resulting type after dereferencing.

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Dereferences the value.

impl Default for OsString
1.9.0
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Constructs an empty OsString.

impl Debug for OsString
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Formats the value using the given formatter.

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

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This method tests for !=.

impl PartialEq<str> for OsString
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl PartialEq<OsString> for str
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl Eq for OsString
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impl PartialOrd for OsString
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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

impl PartialOrd<str> for OsString
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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

impl Ord for OsString
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This method returns an Ordering between self and other. Read more

1.21.0
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Compares and returns the maximum of two values. Read more

1.21.0
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Compares and returns the minimum of two values. Read more

impl Hash for OsString
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Feeds this value into the given [Hasher]. Read more

1.3.0
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Feeds a slice of this type into the given [Hasher]. Read more

impl From<Box<OsStr>> for OsString
1.18.0
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Performs the conversion.

impl From<OsString> for Box<OsStr>
1.20.0
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Performs the conversion.

impl<'a, 'b> PartialEq<OsStr> for OsString
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialEq<OsString> for OsStr
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialOrd<OsStr> for OsString
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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

impl<'a, 'b> PartialOrd<OsString> for OsStr
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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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 OsStr> for OsString
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialEq<OsString> for &'a OsStr
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialOrd<&'a OsStr> for OsString
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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

impl<'a, 'b> PartialOrd<OsString> for &'a OsStr
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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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 Cow<'a, OsStr>
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialEq<Cow<'a, OsStr>> for OsString
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialOrd<OsString> for Cow<'a, OsStr>
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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

impl<'a, 'b> PartialOrd<Cow<'a, OsStr>> for OsString
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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

impl Borrow<OsStr> for OsString
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Immutably borrows from an owned value. Read more

impl AsRef<OsStr> for OsString
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Performs the conversion.

impl From<OsString> for PathBuf
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Performs the conversion.

impl From<PathBuf> for OsString
1.14.0
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Performs the conversion.

impl AsRef<Path> for OsString
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Performs the conversion.

impl<'a, 'b> PartialEq<OsString> for PathBuf
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialEq<PathBuf> for OsString
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialOrd<OsString> for PathBuf
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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

impl<'a, 'b> PartialOrd<PathBuf> for OsString
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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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 Path
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialEq<Path> for OsString
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialOrd<OsString> for Path
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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

impl<'a, 'b> PartialOrd<Path> for OsString
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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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 Path
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialEq<&'a Path> for OsString
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialOrd<OsString> for &'a Path
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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

impl<'a, 'b> PartialOrd<&'a Path> for OsString
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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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 Cow<'a, Path>
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialEq<Cow<'a, Path>> for OsString
1.8.0
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a, 'b> PartialOrd<OsString> for Cow<'a, Path>
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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

impl<'a, 'b> PartialOrd<Cow<'a, Path>> for OsString
1.8.0
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This method returns an ordering between self and other values if one exists. Read more

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

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

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

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

impl OsStringExt for OsString
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This is supported on Unix only.

Creates an [OsString] from a byte vector. Read more

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This is supported on Unix only.

Yields the underlying byte vector of this [OsString]. Read more

impl OsStringExt for OsString
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This is supported on Windows only.

Creates an OsString from a potentially ill-formed UTF-16 slice of 16-bit code units. Read more