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Diffstat (limited to 'library/std/src/ffi/os_str.rs')
| -rw-r--r-- | library/std/src/ffi/os_str.rs | 1365 |
1 files changed, 1365 insertions, 0 deletions
diff --git a/library/std/src/ffi/os_str.rs b/library/std/src/ffi/os_str.rs new file mode 100644 index 00000000000..d1eaf3c583f --- /dev/null +++ b/library/std/src/ffi/os_str.rs @@ -0,0 +1,1365 @@ +use crate::borrow::{Borrow, Cow}; +use crate::cmp; +use crate::fmt; +use crate::hash::{Hash, Hasher}; +use crate::ops; +use crate::rc::Rc; +use crate::str::FromStr; +use crate::sync::Arc; + +use crate::sys::os_str::{Buf, Slice}; +use crate::sys_common::{AsInner, FromInner, IntoInner}; + +/// 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, which 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 if possible. A consequence +/// of this is that `OsString` instances are *not* `NUL` terminated; in order +/// to pass to e.g., Unix system call, you should create a [`CStr`]. +/// +/// `OsString` is to [`&OsStr`] as [`String`] is to [`&str`]: the former +/// in each pair are owned strings; the latter are borrowed +/// references. +/// +/// Note, `OsString` and [`OsStr`] internally do not necessarily hold strings in +/// the form native to the platform; While on Unix, strings are stored as a +/// sequence of 8-bit values, on Windows, where strings are 16-bit value based +/// as just discussed, strings are also actually stored as a sequence of 8-bit +/// values, encoded in a less-strict variant of UTF-8. This is useful to +/// understand when handling capacity and length values. +/// +/// # 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`][String.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. +/// +/// [`OsStr`]: struct.OsStr.html +/// [`&OsStr`]: struct.OsStr.html +/// [`CStr`]: struct.CStr.html +/// [`From`]: ../convert/trait.From.html +/// [`String`]: ../string/struct.String.html +/// [`&str`]: ../primitive.str.html +/// [`u8`]: ../primitive.u8.html +/// [`u16`]: ../primitive.u16.html +/// [String.push_str]: ../string/struct.String.html#method.push_str +/// [`new`]: #method.new +/// [`push`]: #method.push +/// [`as_os_str`]: #method.as_os_str +/// [conversions]: index.html#conversions +#[derive(Clone)] +#[stable(feature = "rust1", since = "1.0.0")] +pub struct OsString { + inner: Buf, +} + +/// Borrowed reference to an OS string (see [`OsString`]). +/// +/// This type represents a borrowed reference to a string in the operating system's preferred +/// representation. +/// +/// `&OsStr` is to [`OsString`] as [`&str`] is to [`String`]: the former in each pair are borrowed +/// references; the latter are owned strings. +/// +/// See the [module's toplevel documentation about conversions][conversions] for a discussion on +/// the traits which `OsStr` implements for [conversions] from/to native representations. +/// +/// [`OsString`]: struct.OsString.html +/// [`&str`]: ../primitive.str.html +/// [`String`]: ../string/struct.String.html +/// [conversions]: index.html#conversions +#[stable(feature = "rust1", since = "1.0.0")] +// FIXME: +// `OsStr::from_inner` current implementation relies +// on `OsStr` being layout-compatible with `Slice`. +// When attribute privacy is implemented, `OsStr` should be annotated as `#[repr(transparent)]`. +// Anyway, `OsStr` representation and layout are considered implementation detail, are +// not documented and must not be relied upon. +pub struct OsStr { + inner: Slice, +} + +impl OsString { + /// Constructs a new empty `OsString`. + /// + /// # Examples + /// + /// ``` + /// use std::ffi::OsString; + /// + /// let os_string = OsString::new(); + /// ``` + #[stable(feature = "rust1", since = "1.0.0")] + pub fn new() -> OsString { + OsString { inner: Buf::from_string(String::new()) } + } + + /// Converts to an [`OsStr`] slice. + /// + /// [`OsStr`]: struct.OsStr.html + /// + /// # 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); + /// ``` + #[stable(feature = "rust1", since = "1.0.0")] + pub fn as_os_str(&self) -> &OsStr { + self + } + + /// Converts the `OsString` into a [`String`] if it contains valid Unicode data. + /// + /// On failure, ownership of the original `OsString` is returned. + /// + /// [`String`]: ../../std/string/struct.String.html + /// + /// # Examples + /// + /// ``` + /// use std::ffi::OsString; + /// + /// let os_string = OsString::from("foo"); + /// let string = os_string.into_string(); + /// assert_eq!(string, Ok(String::from("foo"))); + /// ``` + #[stable(feature = "rust1", since = "1.0.0")] + pub fn into_string(self) -> Result<String, OsString> { + self.inner.into_string().map_err(|buf| OsString { inner: buf }) + } + + /// Extends the string with the given [`&OsStr`] slice. + /// + /// [`&OsStr`]: struct.OsStr.html + /// + /// # Examples + /// + /// ``` + /// use std::ffi::OsString; + /// + /// let mut os_string = OsString::from("foo"); + /// os_string.push("bar"); + /// assert_eq!(&os_string, "foobar"); + /// ``` + #[stable(feature = "rust1", since = "1.0.0")] + pub fn push<T: AsRef<OsStr>>(&mut self, s: T) { + self.inner.push_slice(&s.as_ref().inner) + } + + /// 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()); + /// ``` + #[stable(feature = "osstring_simple_functions", since = "1.9.0")] + pub fn with_capacity(capacity: usize) -> OsString { + OsString { inner: Buf::with_capacity(capacity) } + } + + /// 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, ""); + /// ``` + #[stable(feature = "osstring_simple_functions", since = "1.9.0")] + pub fn clear(&mut self) { + self.inner.clear() + } + + /// Returns the capacity this `OsString` can hold without reallocating. + /// + /// See `OsString` introduction for information about encoding. + /// + /// # Examples + /// + /// ``` + /// use std::ffi::OsString; + /// + /// let os_string = OsString::with_capacity(10); + /// assert!(os_string.capacity() >= 10); + /// ``` + #[stable(feature = "osstring_simple_functions", since = "1.9.0")] + pub fn capacity(&self) -> usize { + self.inner.capacity() + } + + /// 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); + /// ``` + #[stable(feature = "osstring_simple_functions", since = "1.9.0")] + pub fn reserve(&mut self, additional: usize) { + self.inner.reserve(additional) + } + + /// 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); + /// ``` + #[stable(feature = "osstring_simple_functions", since = "1.9.0")] + pub fn reserve_exact(&mut self, additional: usize) { + self.inner.reserve_exact(additional) + } + + /// 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()); + /// ``` + #[stable(feature = "osstring_shrink_to_fit", since = "1.19.0")] + pub fn shrink_to_fit(&mut self) { + self.inner.shrink_to_fit() + } + + /// Shrinks the capacity of the `OsString` with a lower bound. + /// + /// The capacity will remain at least as large as both the length + /// and the supplied value. + /// + /// Panics if the current capacity is smaller than the supplied + /// minimum capacity. + /// + /// # Examples + /// + /// ``` + /// #![feature(shrink_to)] + /// use std::ffi::OsString; + /// + /// let mut s = OsString::from("foo"); + /// + /// s.reserve(100); + /// assert!(s.capacity() >= 100); + /// + /// s.shrink_to(10); + /// assert!(s.capacity() >= 10); + /// s.shrink_to(0); + /// assert!(s.capacity() >= 3); + /// ``` + #[inline] + #[unstable(feature = "shrink_to", reason = "new API", issue = "56431")] + pub fn shrink_to(&mut self, min_capacity: usize) { + self.inner.shrink_to(min_capacity) + } + + /// Converts this `OsString` into a boxed [`OsStr`]. + /// + /// [`OsStr`]: struct.OsStr.html + /// + /// # Examples + /// + /// ``` + /// use std::ffi::{OsString, OsStr}; + /// + /// let s = OsString::from("hello"); + /// + /// let b: Box<OsStr> = s.into_boxed_os_str(); + /// ``` + #[stable(feature = "into_boxed_os_str", since = "1.20.0")] + pub fn into_boxed_os_str(self) -> Box<OsStr> { + let rw = Box::into_raw(self.inner.into_box()) as *mut OsStr; + unsafe { Box::from_raw(rw) } + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl From<String> for OsString { + /// Converts a [`String`] into a [`OsString`]. + /// + /// The conversion copies the data, and includes an allocation on the heap. + /// + /// [`OsString`]: ../../std/ffi/struct.OsString.html + fn from(s: String) -> OsString { + OsString { inner: Buf::from_string(s) } + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl<T: ?Sized + AsRef<OsStr>> From<&T> for OsString { + fn from(s: &T) -> OsString { + s.as_ref().to_os_string() + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl ops::Index<ops::RangeFull> for OsString { + type Output = OsStr; + + #[inline] + fn index(&self, _index: ops::RangeFull) -> &OsStr { + OsStr::from_inner(self.inner.as_slice()) + } +} + +#[stable(feature = "mut_osstr", since = "1.44.0")] +impl ops::IndexMut<ops::RangeFull> for OsString { + #[inline] + fn index_mut(&mut self, _index: ops::RangeFull) -> &mut OsStr { + OsStr::from_inner_mut(self.inner.as_mut_slice()) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl ops::Deref for OsString { + type Target = OsStr; + + #[inline] + fn deref(&self) -> &OsStr { + &self[..] + } +} + +#[stable(feature = "mut_osstr", since = "1.44.0")] +impl ops::DerefMut for OsString { + #[inline] + fn deref_mut(&mut self) -> &mut OsStr { + &mut self[..] + } +} + +#[stable(feature = "osstring_default", since = "1.9.0")] +impl Default for OsString { + /// Constructs an empty `OsString`. + #[inline] + fn default() -> OsString { + OsString::new() + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl fmt::Debug for OsString { + fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt::Debug::fmt(&**self, formatter) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl PartialEq for OsString { + fn eq(&self, other: &OsString) -> bool { + &**self == &**other + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl PartialEq<str> for OsString { + fn eq(&self, other: &str) -> bool { + &**self == other + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl PartialEq<OsString> for str { + fn eq(&self, other: &OsString) -> bool { + &**other == self + } +} + +#[stable(feature = "os_str_str_ref_eq", since = "1.29.0")] +impl PartialEq<&str> for OsString { + fn eq(&self, other: &&str) -> bool { + **self == **other + } +} + +#[stable(feature = "os_str_str_ref_eq", since = "1.29.0")] +impl<'a> PartialEq<OsString> for &'a str { + fn eq(&self, other: &OsString) -> bool { + **other == **self + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl Eq for OsString {} + +#[stable(feature = "rust1", since = "1.0.0")] +impl PartialOrd for OsString { + #[inline] + fn partial_cmp(&self, other: &OsString) -> Option<cmp::Ordering> { + (&**self).partial_cmp(&**other) + } + #[inline] + fn lt(&self, other: &OsString) -> bool { + &**self < &**other + } + #[inline] + fn le(&self, other: &OsString) -> bool { + &**self <= &**other + } + #[inline] + fn gt(&self, other: &OsString) -> bool { + &**self > &**other + } + #[inline] + fn ge(&self, other: &OsString) -> bool { + &**self >= &**other + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl PartialOrd<str> for OsString { + #[inline] + fn partial_cmp(&self, other: &str) -> Option<cmp::Ordering> { + (&**self).partial_cmp(other) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl Ord for OsString { + #[inline] + fn cmp(&self, other: &OsString) -> cmp::Ordering { + (&**self).cmp(&**other) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl Hash for OsString { + #[inline] + fn hash<H: Hasher>(&self, state: &mut H) { + (&**self).hash(state) + } +} + +impl OsStr { + /// Coerces into an `OsStr` slice. + /// + /// # Examples + /// + /// ``` + /// use std::ffi::OsStr; + /// + /// let os_str = OsStr::new("foo"); + /// ``` + #[inline] + #[stable(feature = "rust1", since = "1.0.0")] + pub fn new<S: AsRef<OsStr> + ?Sized>(s: &S) -> &OsStr { + s.as_ref() + } + + #[inline] + fn from_inner(inner: &Slice) -> &OsStr { + // Safety: OsStr is just a wrapper of Slice, + // therefore converting &Slice to &OsStr is safe. + unsafe { &*(inner as *const Slice as *const OsStr) } + } + + #[inline] + fn from_inner_mut(inner: &mut Slice) -> &mut OsStr { + // Safety: OsStr is just a wrapper of Slice, + // therefore converting &mut Slice to &mut OsStr is safe. + // Any method that mutates OsStr must be careful not to + // break platform-specific encoding, in particular Wtf8 on Windows. + unsafe { &mut *(inner as *mut Slice as *mut OsStr) } + } + + /// Yields a [`&str`] slice if the `OsStr` is valid Unicode. + /// + /// This conversion may entail doing a check for UTF-8 validity. + /// + /// [`&str`]: ../../std/primitive.str.html + /// + /// # Examples + /// + /// ``` + /// use std::ffi::OsStr; + /// + /// let os_str = OsStr::new("foo"); + /// assert_eq!(os_str.to_str(), Some("foo")); + /// ``` + #[stable(feature = "rust1", since = "1.0.0")] + pub fn to_str(&self) -> Option<&str> { + self.inner.to_str() + } + + /// Converts an `OsStr` to a [`Cow`]`<`[`str`]`>`. + /// + /// Any non-Unicode sequences are replaced with + /// [`U+FFFD REPLACEMENT CHARACTER`][U+FFFD]. + /// + /// [`Cow`]: ../../std/borrow/enum.Cow.html + /// [`str`]: ../../std/primitive.str.html + /// [U+FFFD]: ../../std/char/constant.REPLACEMENT_CHARACTER.html + /// + /// # Examples + /// + /// Calling `to_string_lossy` on an `OsStr` with invalid unicode: + /// + /// ``` + /// // Note, due to differences in how Unix and Windows represent strings, + /// // we are forced to complicate this example, setting up example `OsStr`s + /// // with different source data and via different platform extensions. + /// // Understand that in reality you could end up with such example invalid + /// // sequences simply through collecting user command line arguments, for + /// // example. + /// + /// #[cfg(any(unix, target_os = "redox"))] { + /// use std::ffi::OsStr; + /// use std::os::unix::ffi::OsStrExt; + /// + /// // Here, the values 0x66 and 0x6f correspond to 'f' and 'o' + /// // respectively. The value 0x80 is a lone continuation byte, invalid + /// // in a UTF-8 sequence. + /// let source = [0x66, 0x6f, 0x80, 0x6f]; + /// let os_str = OsStr::from_bytes(&source[..]); + /// + /// assert_eq!(os_str.to_string_lossy(), "fo�o"); + /// } + /// #[cfg(windows)] { + /// use std::ffi::OsString; + /// use std::os::windows::prelude::*; + /// + /// // Here the values 0x0066 and 0x006f correspond to 'f' and 'o' + /// // respectively. The value 0xD800 is a lone surrogate half, invalid + /// // in a UTF-16 sequence. + /// let source = [0x0066, 0x006f, 0xD800, 0x006f]; + /// let os_string = OsString::from_wide(&source[..]); + /// let os_str = os_string.as_os_str(); + /// + /// assert_eq!(os_str.to_string_lossy(), "fo�o"); + /// } + /// ``` + #[stable(feature = "rust1", since = "1.0.0")] + pub fn to_string_lossy(&self) -> Cow<'_, str> { + self.inner.to_string_lossy() + } + + /// Copies the slice into an owned [`OsString`]. + /// + /// [`OsString`]: struct.OsString.html + /// + /// # 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")); + /// ``` + #[stable(feature = "rust1", since = "1.0.0")] + pub fn to_os_string(&self) -> OsString { + OsString { inner: self.inner.to_owned() } + } + + /// 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()); + /// ``` + #[stable(feature = "osstring_simple_functions", since = "1.9.0")] + #[inline] + pub fn is_empty(&self) -> bool { + self.inner.inner.is_empty() + } + + /// Returns the length of this `OsStr`. + /// + /// Note that this does **not** return the number of bytes in the string in + /// OS string form. + /// + /// The length returned is that of the underlying storage used by `OsStr`. + /// As discussed in the [`OsString`] introduction, [`OsString`] and `OsStr` + /// store strings in a form best suited for cheap inter-conversion between + /// native-platform and Rust string forms, which may differ significantly + /// from both of them, including in storage size and encoding. + /// + /// This number is simply useful for passing to other methods, like + /// [`OsString::with_capacity`] to avoid reallocations. + /// + /// [`OsString`]: struct.OsString.html + /// [`OsString::with_capacity`]: struct.OsString.html#method.with_capacity + /// + /// # 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); + /// ``` + #[stable(feature = "osstring_simple_functions", since = "1.9.0")] + pub fn len(&self) -> usize { + self.inner.inner.len() + } + + /// Converts a [`Box`]`<OsStr>` into an [`OsString`] without copying or allocating. + /// + /// [`Box`]: ../boxed/struct.Box.html + /// [`OsString`]: struct.OsString.html + #[stable(feature = "into_boxed_os_str", since = "1.20.0")] + pub fn into_os_string(self: Box<OsStr>) -> OsString { + let boxed = unsafe { Box::from_raw(Box::into_raw(self) as *mut Slice) }; + OsString { inner: Buf::from_box(boxed) } + } + + /// Gets the underlying byte representation. + /// + /// Note: it is *crucial* that this API is private, to avoid + /// revealing the internal, platform-specific encodings. + #[inline] + fn bytes(&self) -> &[u8] { + unsafe { &*(&self.inner as *const _ as *const [u8]) } + } + + /// Converts this string to its ASCII lower case equivalent in-place. + /// + /// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z', + /// but non-ASCII letters are unchanged. + /// + /// To return a new lowercased value without modifying the existing one, use + /// [`to_ascii_lowercase`]. + /// + /// [`to_ascii_lowercase`]: #method.to_ascii_lowercase + /// + /// # Examples + /// + /// ``` + /// #![feature(osstring_ascii)] + /// use std::ffi::OsString; + /// + /// let mut s = OsString::from("GRÜßE, JÜRGEN ❤"); + /// + /// s.make_ascii_lowercase(); + /// + /// assert_eq!("grÜße, jÜrgen ❤", s); + /// ``` + #[unstable(feature = "osstring_ascii", issue = "70516")] + pub fn make_ascii_lowercase(&mut self) { + self.inner.make_ascii_lowercase() + } + + /// Converts this string to its ASCII upper case equivalent in-place. + /// + /// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z', + /// but non-ASCII letters are unchanged. + /// + /// To return a new uppercased value without modifying the existing one, use + /// [`to_ascii_uppercase`]. + /// + /// [`to_ascii_uppercase`]: #method.to_ascii_uppercase + /// + /// # Examples + /// + /// ``` + /// #![feature(osstring_ascii)] + /// use std::ffi::OsString; + /// + /// let mut s = OsString::from("Grüße, Jürgen ❤"); + /// + /// s.make_ascii_uppercase(); + /// + /// assert_eq!("GRüßE, JüRGEN ❤", s); + /// ``` + #[unstable(feature = "osstring_ascii", issue = "70516")] + pub fn make_ascii_uppercase(&mut self) { + self.inner.make_ascii_uppercase() + } + + /// Returns a copy of this string where each character is mapped to its + /// ASCII lower case equivalent. + /// + /// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z', + /// but non-ASCII letters are unchanged. + /// + /// To lowercase the value in-place, use [`make_ascii_lowercase`]. + /// + /// [`make_ascii_lowercase`]: #method.make_ascii_lowercase + /// + /// # Examples + /// + /// ``` + /// #![feature(osstring_ascii)] + /// use std::ffi::OsString; + /// let s = OsString::from("Grüße, Jürgen ❤"); + /// + /// assert_eq!("grüße, jürgen ❤", s.to_ascii_lowercase()); + /// ``` + #[unstable(feature = "osstring_ascii", issue = "70516")] + pub fn to_ascii_lowercase(&self) -> OsString { + OsString::from_inner(self.inner.to_ascii_lowercase()) + } + + /// Returns a copy of this string where each character is mapped to its + /// ASCII upper case equivalent. + /// + /// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z', + /// but non-ASCII letters are unchanged. + /// + /// To uppercase the value in-place, use [`make_ascii_uppercase`]. + /// + /// [`make_ascii_uppercase`]: #method.make_ascii_uppercase + /// + /// # Examples + /// + /// ``` + /// #![feature(osstring_ascii)] + /// use std::ffi::OsString; + /// let s = OsString::from("Grüße, Jürgen ❤"); + /// + /// assert_eq!("GRüßE, JüRGEN ❤", s.to_ascii_uppercase()); + /// ``` + #[unstable(feature = "osstring_ascii", issue = "70516")] + pub fn to_ascii_uppercase(&self) -> OsString { + OsString::from_inner(self.inner.to_ascii_uppercase()) + } + + /// Checks if all characters in this string are within the ASCII range. + /// + /// # Examples + /// + /// ``` + /// #![feature(osstring_ascii)] + /// use std::ffi::OsString; + /// + /// let ascii = OsString::from("hello!\n"); + /// let non_ascii = OsString::from("Grüße, Jürgen ❤"); + /// + /// assert!(ascii.is_ascii()); + /// assert!(!non_ascii.is_ascii()); + /// ``` + #[unstable(feature = "osstring_ascii", issue = "70516")] + pub fn is_ascii(&self) -> bool { + self.inner.is_ascii() + } + + /// Checks that two strings are an ASCII case-insensitive match. + /// + /// Same as `to_ascii_lowercase(a) == to_ascii_lowercase(b)`, + /// but without allocating and copying temporaries. + /// + /// # Examples + /// + /// ``` + /// #![feature(osstring_ascii)] + /// use std::ffi::OsString; + /// + /// assert!(OsString::from("Ferris").eq_ignore_ascii_case("FERRIS")); + /// assert!(OsString::from("Ferrös").eq_ignore_ascii_case("FERRöS")); + /// assert!(!OsString::from("Ferrös").eq_ignore_ascii_case("FERRÖS")); + /// ``` + #[unstable(feature = "osstring_ascii", issue = "70516")] + pub fn eq_ignore_ascii_case<S: ?Sized + AsRef<OsStr>>(&self, other: &S) -> bool { + self.inner.eq_ignore_ascii_case(&other.as_ref().inner) + } +} + +#[stable(feature = "box_from_os_str", since = "1.17.0")] +impl From<&OsStr> for Box<OsStr> { + fn from(s: &OsStr) -> Box<OsStr> { + let rw = Box::into_raw(s.inner.into_box()) as *mut OsStr; + unsafe { Box::from_raw(rw) } + } +} + +#[stable(feature = "box_from_cow", since = "1.45.0")] +impl From<Cow<'_, OsStr>> for Box<OsStr> { + #[inline] + fn from(cow: Cow<'_, OsStr>) -> Box<OsStr> { + match cow { + Cow::Borrowed(s) => Box::from(s), + Cow::Owned(s) => Box::from(s), + } + } +} + +#[stable(feature = "os_string_from_box", since = "1.18.0")] +impl From<Box<OsStr>> for OsString { + /// Converts a [`Box`]`<`[`OsStr`]`>` into a `OsString` without copying or + /// allocating. + /// + /// [`Box`]: ../boxed/struct.Box.html + /// [`OsStr`]: ../ffi/struct.OsStr.html + fn from(boxed: Box<OsStr>) -> OsString { + boxed.into_os_string() + } +} + +#[stable(feature = "box_from_os_string", since = "1.20.0")] +impl From<OsString> for Box<OsStr> { + /// Converts a [`OsString`] into a [`Box`]`<OsStr>` without copying or allocating. + /// + /// [`Box`]: ../boxed/struct.Box.html + /// [`OsString`]: ../ffi/struct.OsString.html + fn from(s: OsString) -> Box<OsStr> { + s.into_boxed_os_str() + } +} + +#[stable(feature = "more_box_slice_clone", since = "1.29.0")] +impl Clone for Box<OsStr> { + #[inline] + fn clone(&self) -> Self { + self.to_os_string().into_boxed_os_str() + } +} + +#[stable(feature = "shared_from_slice2", since = "1.24.0")] +impl From<OsString> for Arc<OsStr> { + /// Converts a [`OsString`] into a [`Arc`]`<OsStr>` without copying or allocating. + /// + /// [`Arc`]: ../sync/struct.Arc.html + /// [`OsString`]: ../ffi/struct.OsString.html + #[inline] + fn from(s: OsString) -> Arc<OsStr> { + let arc = s.inner.into_arc(); + unsafe { Arc::from_raw(Arc::into_raw(arc) as *const OsStr) } + } +} + +#[stable(feature = "shared_from_slice2", since = "1.24.0")] +impl From<&OsStr> for Arc<OsStr> { + #[inline] + fn from(s: &OsStr) -> Arc<OsStr> { + let arc = s.inner.into_arc(); + unsafe { Arc::from_raw(Arc::into_raw(arc) as *const OsStr) } + } +} + +#[stable(feature = "shared_from_slice2", since = "1.24.0")] +impl From<OsString> for Rc<OsStr> { + /// Converts a [`OsString`] into a [`Rc`]`<OsStr>` without copying or allocating. + /// + /// [`Rc`]: ../rc/struct.Rc.html + /// [`OsString`]: ../ffi/struct.OsString.html + #[inline] + fn from(s: OsString) -> Rc<OsStr> { + let rc = s.inner.into_rc(); + unsafe { Rc::from_raw(Rc::into_raw(rc) as *const OsStr) } + } +} + +#[stable(feature = "shared_from_slice2", since = "1.24.0")] +impl From<&OsStr> for Rc<OsStr> { + #[inline] + fn from(s: &OsStr) -> Rc<OsStr> { + let rc = s.inner.into_rc(); + unsafe { Rc::from_raw(Rc::into_raw(rc) as *const OsStr) } + } +} + +#[stable(feature = "cow_from_osstr", since = "1.28.0")] +impl<'a> From<OsString> for Cow<'a, OsStr> { + #[inline] + fn from(s: OsString) -> Cow<'a, OsStr> { + Cow::Owned(s) + } +} + +#[stable(feature = "cow_from_osstr", since = "1.28.0")] +impl<'a> From<&'a OsStr> for Cow<'a, OsStr> { + #[inline] + fn from(s: &'a OsStr) -> Cow<'a, OsStr> { + Cow::Borrowed(s) + } +} + +#[stable(feature = "cow_from_osstr", since = "1.28.0")] +impl<'a> From<&'a OsString> for Cow<'a, OsStr> { + #[inline] + fn from(s: &'a OsString) -> Cow<'a, OsStr> { + Cow::Borrowed(s.as_os_str()) + } +} + +#[stable(feature = "osstring_from_cow_osstr", since = "1.28.0")] +impl<'a> From<Cow<'a, OsStr>> for OsString { + #[inline] + fn from(s: Cow<'a, OsStr>) -> Self { + s.into_owned() + } +} + +#[stable(feature = "box_default_extra", since = "1.17.0")] +impl Default for Box<OsStr> { + fn default() -> Box<OsStr> { + let rw = Box::into_raw(Slice::empty_box()) as *mut OsStr; + unsafe { Box::from_raw(rw) } + } +} + +#[stable(feature = "osstring_default", since = "1.9.0")] +impl Default for &OsStr { + /// Creates an empty `OsStr`. + #[inline] + fn default() -> Self { + OsStr::new("") + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl PartialEq for OsStr { + #[inline] + fn eq(&self, other: &OsStr) -> bool { + self.bytes().eq(other.bytes()) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl PartialEq<str> for OsStr { + #[inline] + fn eq(&self, other: &str) -> bool { + *self == *OsStr::new(other) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl PartialEq<OsStr> for str { + #[inline] + fn eq(&self, other: &OsStr) -> bool { + *other == *OsStr::new(self) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl Eq for OsStr {} + +#[stable(feature = "rust1", since = "1.0.0")] +impl PartialOrd for OsStr { + #[inline] + fn partial_cmp(&self, other: &OsStr) -> Option<cmp::Ordering> { + self.bytes().partial_cmp(other.bytes()) + } + #[inline] + fn lt(&self, other: &OsStr) -> bool { + self.bytes().lt(other.bytes()) + } + #[inline] + fn le(&self, other: &OsStr) -> bool { + self.bytes().le(other.bytes()) + } + #[inline] + fn gt(&self, other: &OsStr) -> bool { + self.bytes().gt(other.bytes()) + } + #[inline] + fn ge(&self, other: &OsStr) -> bool { + self.bytes().ge(other.bytes()) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl PartialOrd<str> for OsStr { + #[inline] + fn partial_cmp(&self, other: &str) -> Option<cmp::Ordering> { + self.partial_cmp(OsStr::new(other)) + } +} + +// FIXME (#19470): cannot provide PartialOrd<OsStr> for str until we +// have more flexible coherence rules. + +#[stable(feature = "rust1", since = "1.0.0")] +impl Ord for OsStr { + #[inline] + fn cmp(&self, other: &OsStr) -> cmp::Ordering { + self.bytes().cmp(other.bytes()) + } +} + +macro_rules! impl_cmp { + ($lhs:ty, $rhs: ty) => { + #[stable(feature = "cmp_os_str", since = "1.8.0")] + impl<'a, 'b> PartialEq<$rhs> for $lhs { + #[inline] + fn eq(&self, other: &$rhs) -> bool { + <OsStr as PartialEq>::eq(self, other) + } + } + + #[stable(feature = "cmp_os_str", since = "1.8.0")] + impl<'a, 'b> PartialEq<$lhs> for $rhs { + #[inline] + fn eq(&self, other: &$lhs) -> bool { + <OsStr as PartialEq>::eq(self, other) + } + } + + #[stable(feature = "cmp_os_str", since = "1.8.0")] + impl<'a, 'b> PartialOrd<$rhs> for $lhs { + #[inline] + fn partial_cmp(&self, other: &$rhs) -> Option<cmp::Ordering> { + <OsStr as PartialOrd>::partial_cmp(self, other) + } + } + + #[stable(feature = "cmp_os_str", since = "1.8.0")] + impl<'a, 'b> PartialOrd<$lhs> for $rhs { + #[inline] + fn partial_cmp(&self, other: &$lhs) -> Option<cmp::Ordering> { + <OsStr as PartialOrd>::partial_cmp(self, other) + } + } + }; +} + +impl_cmp!(OsString, OsStr); +impl_cmp!(OsString, &'a OsStr); +impl_cmp!(Cow<'a, OsStr>, OsStr); +impl_cmp!(Cow<'a, OsStr>, &'b OsStr); +impl_cmp!(Cow<'a, OsStr>, OsString); + +#[stable(feature = "rust1", since = "1.0.0")] +impl Hash for OsStr { + #[inline] + fn hash<H: Hasher>(&self, state: &mut H) { + self.bytes().hash(state) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl fmt::Debug for OsStr { + fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt::Debug::fmt(&self.inner, formatter) + } +} + +impl OsStr { + pub(crate) fn display(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt::Display::fmt(&self.inner, formatter) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl Borrow<OsStr> for OsString { + fn borrow(&self) -> &OsStr { + &self[..] + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl ToOwned for OsStr { + type Owned = OsString; + fn to_owned(&self) -> OsString { + self.to_os_string() + } + fn clone_into(&self, target: &mut OsString) { + self.inner.clone_into(&mut target.inner) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl AsRef<OsStr> for OsStr { + fn as_ref(&self) -> &OsStr { + self + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl AsRef<OsStr> for OsString { + #[inline] + fn as_ref(&self) -> &OsStr { + self + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl AsRef<OsStr> for str { + #[inline] + fn as_ref(&self) -> &OsStr { + OsStr::from_inner(Slice::from_str(self)) + } +} + +#[stable(feature = "rust1", since = "1.0.0")] +impl AsRef<OsStr> for String { + #[inline] + fn as_ref(&self) -> &OsStr { + (&**self).as_ref() + } +} + +impl FromInner<Buf> for OsString { + fn from_inner(buf: Buf) -> OsString { + OsString { inner: buf } + } +} + +impl IntoInner<Buf> for OsString { + fn into_inner(self) -> Buf { + self.inner + } +} + +impl AsInner<Slice> for OsStr { + #[inline] + fn as_inner(&self) -> &Slice { + &self.inner + } +} + +#[stable(feature = "osstring_from_str", since = "1.45.0")] +impl FromStr for OsString { + type Err = core::convert::Infallible; + + fn from_str(s: &str) -> Result<Self, Self::Err> { + Ok(OsString::from(s)) + } +} + +#[cfg(test)] +mod tests { + use super::*; + use crate::sys_common::{AsInner, IntoInner}; + + use crate::rc::Rc; + use crate::sync::Arc; + + #[test] + fn test_os_string_with_capacity() { + let os_string = OsString::with_capacity(0); + assert_eq!(0, os_string.inner.into_inner().capacity()); + + let os_string = OsString::with_capacity(10); + assert_eq!(10, os_string.inner.into_inner().capacity()); + + let mut os_string = OsString::with_capacity(0); + os_string.push("abc"); + assert!(os_string.inner.into_inner().capacity() >= 3); + } + + #[test] + fn test_os_string_clear() { + let mut os_string = OsString::from("abc"); + assert_eq!(3, os_string.inner.as_inner().len()); + + os_string.clear(); + assert_eq!(&os_string, ""); + assert_eq!(0, os_string.inner.as_inner().len()); + } + + #[test] + fn test_os_string_capacity() { + let os_string = OsString::with_capacity(0); + assert_eq!(0, os_string.capacity()); + + let os_string = OsString::with_capacity(10); + assert_eq!(10, os_string.capacity()); + + let mut os_string = OsString::with_capacity(0); + os_string.push("abc"); + assert!(os_string.capacity() >= 3); + } + + #[test] + fn test_os_string_reserve() { + let mut os_string = OsString::new(); + assert_eq!(os_string.capacity(), 0); + + os_string.reserve(2); + assert!(os_string.capacity() >= 2); + + for _ in 0..16 { + os_string.push("a"); + } + + assert!(os_string.capacity() >= 16); + os_string.reserve(16); + assert!(os_string.capacity() >= 32); + + os_string.push("a"); + + os_string.reserve(16); + assert!(os_string.capacity() >= 33) + } + + #[test] + fn test_os_string_reserve_exact() { + let mut os_string = OsString::new(); + assert_eq!(os_string.capacity(), 0); + + os_string.reserve_exact(2); + assert!(os_string.capacity() >= 2); + + for _ in 0..16 { + os_string.push("a"); + } + + assert!(os_string.capacity() >= 16); + os_string.reserve_exact(16); + assert!(os_string.capacity() >= 32); + + os_string.push("a"); + + os_string.reserve_exact(16); + assert!(os_string.capacity() >= 33) + } + + #[test] + fn test_os_string_default() { + let os_string: OsString = Default::default(); + assert_eq!("", &os_string); + } + + #[test] + fn test_os_str_is_empty() { + let mut os_string = OsString::new(); + assert!(os_string.is_empty()); + + os_string.push("abc"); + assert!(!os_string.is_empty()); + + os_string.clear(); + assert!(os_string.is_empty()); + } + + #[test] + fn test_os_str_len() { + let mut os_string = OsString::new(); + assert_eq!(0, os_string.len()); + + os_string.push("abc"); + assert_eq!(3, os_string.len()); + + os_string.clear(); + assert_eq!(0, os_string.len()); + } + + #[test] + fn test_os_str_default() { + let os_str: &OsStr = Default::default(); + assert_eq!("", os_str); + } + + #[test] + fn into_boxed() { + let orig = "Hello, world!"; + let os_str = OsStr::new(orig); + let boxed: Box<OsStr> = Box::from(os_str); + let os_string = os_str.to_owned().into_boxed_os_str().into_os_string(); + assert_eq!(os_str, &*boxed); + assert_eq!(&*boxed, &*os_string); + assert_eq!(&*os_string, os_str); + } + + #[test] + fn boxed_default() { + let boxed = <Box<OsStr>>::default(); + assert!(boxed.is_empty()); + } + + #[test] + fn test_os_str_clone_into() { + let mut os_string = OsString::with_capacity(123); + os_string.push("hello"); + let os_str = OsStr::new("bonjour"); + os_str.clone_into(&mut os_string); + assert_eq!(os_str, os_string); + assert!(os_string.capacity() >= 123); + } + + #[test] + fn into_rc() { + let orig = "Hello, world!"; + let os_str = OsStr::new(orig); + let rc: Rc<OsStr> = Rc::from(os_str); + let arc: Arc<OsStr> = Arc::from(os_str); + + assert_eq!(&*rc, os_str); + assert_eq!(&*arc, os_str); + + let rc2: Rc<OsStr> = Rc::from(os_str.to_owned()); + let arc2: Arc<OsStr> = Arc::from(os_str.to_owned()); + + assert_eq!(&*rc2, os_str); + assert_eq!(&*arc2, os_str); + } +} |