1 use crate::borrow::{Borrow, Cow};
5 use crate::hash::{Hash, Hasher};
9 use crate::sys::os_str::{Buf, Slice};
10 use crate::sys_common::{AsInner, IntoInner, FromInner};
12 /// A type that can represent owned, mutable platform-native strings, but is
13 /// cheaply inter-convertible with Rust strings.
15 /// The need for this type arises from the fact that:
17 /// * On Unix systems, strings are often arbitrary sequences of non-zero
18 /// bytes, in many cases interpreted as UTF-8.
20 /// * On Windows, strings are often arbitrary sequences of non-zero 16-bit
21 /// values, interpreted as UTF-16 when it is valid to do so.
23 /// * In Rust, strings are always valid UTF-8, which may contain zeros.
25 /// `OsString` and [`OsStr`] bridge this gap by simultaneously representing Rust
26 /// and platform-native string values, and in particular allowing a Rust string
27 /// to be converted into an "OS" string with no cost if possible. A consequence
28 /// of this is that `OsString` instances are *not* `NUL` terminated; in order
29 /// to pass to e.g., Unix system call, you should create a [`CStr`].
31 /// `OsString` is to [`&OsStr`] as [`String`] is to [`&str`]: the former
32 /// in each pair are owned strings; the latter are borrowed
35 /// Note, `OsString` and `OsStr` internally do not necessarily hold strings in
36 /// the form native to the platform; While on Unix, strings are stored as a
37 /// sequence of 8-bit values, on Windows, where strings are 16-bit value based
38 /// as just discussed, strings are also actually stored as a sequence of 8-bit
39 /// values, encoded in a less-strict variant of UTF-8. This is useful to
40 /// understand when handling capacity and length values.
42 /// # Creating an `OsString`
44 /// **From a Rust string**: `OsString` implements
45 /// [`From`]`<`[`String`]`>`, so you can use `my_string.from` to
46 /// create an `OsString` from a normal Rust string.
48 /// **From slices:** Just like you can start with an empty Rust
49 /// [`String`] and then [`push_str`][String.push_str] `&str`
50 /// sub-string slices into it, you can create an empty `OsString` with
51 /// the [`new`] method and then push string slices into it with the
54 /// # Extracting a borrowed reference to the whole OS string
56 /// You can use the [`as_os_str`] method to get an `&`[`OsStr`] from
57 /// an `OsString`; this is effectively a borrowed reference to the
62 /// See the [module's toplevel documentation about conversions][conversions] for a discussion on
63 /// the traits which `OsString` implements for [conversions] from/to native representations.
65 /// [`OsStr`]: struct.OsStr.html
66 /// [`&OsStr`]: struct.OsStr.html
67 /// [`CStr`]: struct.CStr.html
68 /// [`From`]: ../convert/trait.From.html
69 /// [`String`]: ../string/struct.String.html
70 /// [`&str`]: ../primitive.str.html
71 /// [`u8`]: ../primitive.u8.html
72 /// [`u16`]: ../primitive.u16.html
73 /// [String.push_str]: ../string/struct.String.html#method.push_str
74 /// [`new`]: #method.new
75 /// [`push`]: #method.push
76 /// [`as_os_str`]: #method.as_os_str
77 /// [conversions]: index.html#conversions
79 #[stable(feature = "rust1", since = "1.0.0")]
84 /// Borrowed reference to an OS string (see [`OsString`]).
86 /// This type represents a borrowed reference to a string in the operating system's preferred
89 /// `&OsStr` is to [`OsString`] as [`&str`] is to [`String`]: the former in each pair are borrowed
90 /// references; the latter are owned strings.
92 /// See the [module's toplevel documentation about conversions][conversions] for a discussion on
93 /// the traits which `OsStr` implements for [conversions] from/to native representations.
95 /// [`OsString`]: struct.OsString.html
96 /// [`&str`]: ../primitive.str.html
97 /// [`String`]: ../string/struct.String.html
98 /// [conversions]: index.html#conversions
99 #[stable(feature = "rust1", since = "1.0.0")]
105 /// Constructs a new empty `OsString`.
110 /// use std::ffi::OsString;
112 /// let os_string = OsString::new();
114 #[stable(feature = "rust1", since = "1.0.0")]
115 pub fn new() -> OsString {
116 OsString { inner: Buf::from_string(String::new()) }
119 /// Converts to an [`OsStr`] slice.
121 /// [`OsStr`]: struct.OsStr.html
126 /// use std::ffi::{OsString, OsStr};
128 /// let os_string = OsString::from("foo");
129 /// let os_str = OsStr::new("foo");
130 /// assert_eq!(os_string.as_os_str(), os_str);
132 #[stable(feature = "rust1", since = "1.0.0")]
133 pub fn as_os_str(&self) -> &OsStr {
137 /// Converts the `OsString` into a [`String`] if it contains valid Unicode data.
139 /// On failure, ownership of the original `OsString` is returned.
141 /// [`String`]: ../../std/string/struct.String.html
146 /// use std::ffi::OsString;
148 /// let os_string = OsString::from("foo");
149 /// let string = os_string.into_string();
150 /// assert_eq!(string, Ok(String::from("foo")));
152 #[stable(feature = "rust1", since = "1.0.0")]
153 pub fn into_string(self) -> Result<String, OsString> {
154 self.inner.into_string().map_err(|buf| OsString { inner: buf} )
157 /// Extends the string with the given [`&OsStr`] slice.
159 /// [`&OsStr`]: struct.OsStr.html
164 /// use std::ffi::OsString;
166 /// let mut os_string = OsString::from("foo");
167 /// os_string.push("bar");
168 /// assert_eq!(&os_string, "foobar");
170 #[stable(feature = "rust1", since = "1.0.0")]
171 pub fn push<T: AsRef<OsStr>>(&mut self, s: T) {
172 self.inner.push_slice(&s.as_ref().inner)
175 /// Creates a new `OsString` with the given capacity.
177 /// The string will be able to hold exactly `capacity` length units of other
178 /// OS strings without reallocating. If `capacity` is 0, the string will not
181 /// See main `OsString` documentation information about encoding.
186 /// use std::ffi::OsString;
188 /// let mut os_string = OsString::with_capacity(10);
189 /// let capacity = os_string.capacity();
191 /// // This push is done without reallocating
192 /// os_string.push("foo");
194 /// assert_eq!(capacity, os_string.capacity());
196 #[stable(feature = "osstring_simple_functions", since = "1.9.0")]
197 pub fn with_capacity(capacity: usize) -> OsString {
199 inner: Buf::with_capacity(capacity)
203 /// Truncates the `OsString` to zero length.
208 /// use std::ffi::OsString;
210 /// let mut os_string = OsString::from("foo");
211 /// assert_eq!(&os_string, "foo");
213 /// os_string.clear();
214 /// assert_eq!(&os_string, "");
216 #[stable(feature = "osstring_simple_functions", since = "1.9.0")]
217 pub fn clear(&mut self) {
221 /// Returns the capacity this `OsString` can hold without reallocating.
223 /// See `OsString` introduction for information about encoding.
228 /// use std::ffi::OsString;
230 /// let mut os_string = OsString::with_capacity(10);
231 /// assert!(os_string.capacity() >= 10);
233 #[stable(feature = "osstring_simple_functions", since = "1.9.0")]
234 pub fn capacity(&self) -> usize {
235 self.inner.capacity()
238 /// Reserves capacity for at least `additional` more capacity to be inserted
239 /// in the given `OsString`.
241 /// The collection may reserve more space to avoid frequent reallocations.
246 /// use std::ffi::OsString;
248 /// let mut s = OsString::new();
250 /// assert!(s.capacity() >= 10);
252 #[stable(feature = "osstring_simple_functions", since = "1.9.0")]
253 pub fn reserve(&mut self, additional: usize) {
254 self.inner.reserve(additional)
257 /// Reserves the minimum capacity for exactly `additional` more capacity to
258 /// be inserted in the given `OsString`. Does nothing if the capacity is
259 /// already sufficient.
261 /// Note that the allocator may give the collection more space than it
262 /// requests. Therefore, capacity can not be relied upon to be precisely
263 /// minimal. Prefer reserve if future insertions are expected.
268 /// use std::ffi::OsString;
270 /// let mut s = OsString::new();
271 /// s.reserve_exact(10);
272 /// assert!(s.capacity() >= 10);
274 #[stable(feature = "osstring_simple_functions", since = "1.9.0")]
275 pub fn reserve_exact(&mut self, additional: usize) {
276 self.inner.reserve_exact(additional)
279 /// Shrinks the capacity of the `OsString` to match its length.
284 /// use std::ffi::OsString;
286 /// let mut s = OsString::from("foo");
289 /// assert!(s.capacity() >= 100);
291 /// s.shrink_to_fit();
292 /// assert_eq!(3, s.capacity());
294 #[stable(feature = "osstring_shrink_to_fit", since = "1.19.0")]
295 pub fn shrink_to_fit(&mut self) {
296 self.inner.shrink_to_fit()
299 /// Shrinks the capacity of the `OsString` with a lower bound.
301 /// The capacity will remain at least as large as both the length
302 /// and the supplied value.
304 /// Panics if the current capacity is smaller than the supplied
305 /// minimum capacity.
310 /// #![feature(shrink_to)]
311 /// use std::ffi::OsString;
313 /// let mut s = OsString::from("foo");
316 /// assert!(s.capacity() >= 100);
319 /// assert!(s.capacity() >= 10);
321 /// assert!(s.capacity() >= 3);
324 #[unstable(feature = "shrink_to", reason = "new API", issue="56431")]
325 pub fn shrink_to(&mut self, min_capacity: usize) {
326 self.inner.shrink_to(min_capacity)
329 /// Converts this `OsString` into a boxed [`OsStr`].
331 /// [`OsStr`]: struct.OsStr.html
336 /// use std::ffi::{OsString, OsStr};
338 /// let s = OsString::from("hello");
340 /// let b: Box<OsStr> = s.into_boxed_os_str();
342 #[stable(feature = "into_boxed_os_str", since = "1.20.0")]
343 pub fn into_boxed_os_str(self) -> Box<OsStr> {
344 let rw = Box::into_raw(self.inner.into_box()) as *mut OsStr;
345 unsafe { Box::from_raw(rw) }
349 #[stable(feature = "rust1", since = "1.0.0")]
350 impl From<String> for OsString {
351 /// Converts a [`String`] into a [`OsString`].
353 /// The conversion copies the data, and includes an allocation on the heap.
355 /// [`OsString`]: ../../std/ffi/struct.OsString.html
356 fn from(s: String) -> OsString {
357 OsString { inner: Buf::from_string(s) }
361 #[stable(feature = "rust1", since = "1.0.0")]
362 impl<T: ?Sized + AsRef<OsStr>> From<&T> for OsString {
363 fn from(s: &T) -> OsString {
364 s.as_ref().to_os_string()
368 #[stable(feature = "rust1", since = "1.0.0")]
369 impl ops::Index<ops::RangeFull> for OsString {
373 fn index(&self, _index: ops::RangeFull) -> &OsStr {
374 OsStr::from_inner(self.inner.as_slice())
378 #[stable(feature = "rust1", since = "1.0.0")]
379 impl ops::Deref for OsString {
383 fn deref(&self) -> &OsStr {
388 #[stable(feature = "osstring_default", since = "1.9.0")]
389 impl Default for OsString {
390 /// Constructs an empty `OsString`.
392 fn default() -> OsString {
397 #[stable(feature = "rust1", since = "1.0.0")]
398 impl fmt::Debug for OsString {
399 fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
400 fmt::Debug::fmt(&**self, formatter)
404 #[stable(feature = "rust1", since = "1.0.0")]
405 impl PartialEq for OsString {
406 fn eq(&self, other: &OsString) -> bool {
411 #[stable(feature = "rust1", since = "1.0.0")]
412 impl PartialEq<str> for OsString {
413 fn eq(&self, other: &str) -> bool {
418 #[stable(feature = "rust1", since = "1.0.0")]
419 impl PartialEq<OsString> for str {
420 fn eq(&self, other: &OsString) -> bool {
425 #[stable(feature = "os_str_str_ref_eq", since = "1.29.0")]
426 impl PartialEq<&str> for OsString {
427 fn eq(&self, other: &&str) -> bool {
432 #[stable(feature = "os_str_str_ref_eq", since = "1.29.0")]
433 impl<'a> PartialEq<OsString> for &'a str {
434 fn eq(&self, other: &OsString) -> bool {
439 #[stable(feature = "rust1", since = "1.0.0")]
440 impl Eq for OsString {}
442 #[stable(feature = "rust1", since = "1.0.0")]
443 impl PartialOrd for OsString {
445 fn partial_cmp(&self, other: &OsString) -> Option<cmp::Ordering> {
446 (&**self).partial_cmp(&**other)
449 fn lt(&self, other: &OsString) -> bool { &**self < &**other }
451 fn le(&self, other: &OsString) -> bool { &**self <= &**other }
453 fn gt(&self, other: &OsString) -> bool { &**self > &**other }
455 fn ge(&self, other: &OsString) -> bool { &**self >= &**other }
458 #[stable(feature = "rust1", since = "1.0.0")]
459 impl PartialOrd<str> for OsString {
461 fn partial_cmp(&self, other: &str) -> Option<cmp::Ordering> {
462 (&**self).partial_cmp(other)
466 #[stable(feature = "rust1", since = "1.0.0")]
467 impl Ord for OsString {
469 fn cmp(&self, other: &OsString) -> cmp::Ordering {
470 (&**self).cmp(&**other)
474 #[stable(feature = "rust1", since = "1.0.0")]
475 impl Hash for OsString {
477 fn hash<H: Hasher>(&self, state: &mut H) {
478 (&**self).hash(state)
483 /// Coerces into an `OsStr` slice.
488 /// use std::ffi::OsStr;
490 /// let os_str = OsStr::new("foo");
492 #[stable(feature = "rust1", since = "1.0.0")]
493 pub fn new<S: AsRef<OsStr> + ?Sized>(s: &S) -> &OsStr {
497 fn from_inner(inner: &Slice) -> &OsStr {
498 unsafe { &*(inner as *const Slice as *const OsStr) }
501 /// Yields a [`&str`] slice if the `OsStr` is valid Unicode.
503 /// This conversion may entail doing a check for UTF-8 validity.
505 /// [`&str`]: ../../std/primitive.str.html
510 /// use std::ffi::OsStr;
512 /// let os_str = OsStr::new("foo");
513 /// assert_eq!(os_str.to_str(), Some("foo"));
515 #[stable(feature = "rust1", since = "1.0.0")]
516 pub fn to_str(&self) -> Option<&str> {
520 /// Converts an `OsStr` to a [`Cow`]`<`[`str`]`>`.
522 /// Any non-Unicode sequences are replaced with
523 /// [`U+FFFD REPLACEMENT CHARACTER`][U+FFFD].
525 /// [`Cow`]: ../../std/borrow/enum.Cow.html
526 /// [`str`]: ../../std/primitive.str.html
527 /// [U+FFFD]: ../../std/char/constant.REPLACEMENT_CHARACTER.html
531 /// Calling `to_string_lossy` on an `OsStr` with invalid unicode:
534 /// // Note, due to differences in how Unix and Windows represent strings,
535 /// // we are forced to complicate this example, setting up example `OsStr`s
536 /// // with different source data and via different platform extensions.
537 /// // Understand that in reality you could end up with such example invalid
538 /// // sequences simply through collecting user command line arguments, for
541 /// #[cfg(any(unix, target_os = "redox"))] {
542 /// use std::ffi::OsStr;
543 /// use std::os::unix::ffi::OsStrExt;
545 /// // Here, the values 0x66 and 0x6f correspond to 'f' and 'o'
546 /// // respectively. The value 0x80 is a lone continuation byte, invalid
547 /// // in a UTF-8 sequence.
548 /// let source = [0x66, 0x6f, 0x80, 0x6f];
549 /// let os_str = OsStr::from_bytes(&source[..]);
551 /// assert_eq!(os_str.to_string_lossy(), "fo�o");
553 /// #[cfg(windows)] {
554 /// use std::ffi::OsString;
555 /// use std::os::windows::prelude::*;
557 /// // Here the values 0x0066 and 0x006f correspond to 'f' and 'o'
558 /// // respectively. The value 0xD800 is a lone surrogate half, invalid
559 /// // in a UTF-16 sequence.
560 /// let source = [0x0066, 0x006f, 0xD800, 0x006f];
561 /// let os_string = OsString::from_wide(&source[..]);
562 /// let os_str = os_string.as_os_str();
564 /// assert_eq!(os_str.to_string_lossy(), "fo�o");
567 #[stable(feature = "rust1", since = "1.0.0")]
568 pub fn to_string_lossy(&self) -> Cow<'_, str> {
569 self.inner.to_string_lossy()
572 /// Copies the slice into an owned [`OsString`].
574 /// [`OsString`]: struct.OsString.html
579 /// use std::ffi::{OsStr, OsString};
581 /// let os_str = OsStr::new("foo");
582 /// let os_string = os_str.to_os_string();
583 /// assert_eq!(os_string, OsString::from("foo"));
585 #[stable(feature = "rust1", since = "1.0.0")]
586 pub fn to_os_string(&self) -> OsString {
587 OsString { inner: self.inner.to_owned() }
590 /// Checks whether the `OsStr` is empty.
595 /// use std::ffi::OsStr;
597 /// let os_str = OsStr::new("");
598 /// assert!(os_str.is_empty());
600 /// let os_str = OsStr::new("foo");
601 /// assert!(!os_str.is_empty());
603 #[stable(feature = "osstring_simple_functions", since = "1.9.0")]
604 pub fn is_empty(&self) -> bool {
605 self.inner.inner.is_empty()
608 /// Returns the length of this `OsStr`.
610 /// Note that this does **not** return the number of bytes in the string in
613 /// The length returned is that of the underlying storage used by `OsStr`;
614 /// As discussed in the [`OsString`] introduction, [`OsString`] and `OsStr`
615 /// store strings in a form best suited for cheap inter-conversion between
616 /// native-platform and Rust string forms, which may differ significantly
617 /// from both of them, including in storage size and encoding.
619 /// This number is simply useful for passing to other methods, like
620 /// [`OsString::with_capacity`] to avoid reallocations.
622 /// [`OsString`]: struct.OsString.html
623 /// [`OsString::with_capacity`]: struct.OsString.html#method.with_capacity
628 /// use std::ffi::OsStr;
630 /// let os_str = OsStr::new("");
631 /// assert_eq!(os_str.len(), 0);
633 /// let os_str = OsStr::new("foo");
634 /// assert_eq!(os_str.len(), 3);
636 #[stable(feature = "osstring_simple_functions", since = "1.9.0")]
637 pub fn len(&self) -> usize {
638 self.inner.inner.len()
641 /// Converts a [`Box`]`<OsStr>` into an [`OsString`] without copying or allocating.
643 /// [`Box`]: ../boxed/struct.Box.html
644 /// [`OsString`]: struct.OsString.html
645 #[stable(feature = "into_boxed_os_str", since = "1.20.0")]
646 pub fn into_os_string(self: Box<OsStr>) -> OsString {
647 let boxed = unsafe { Box::from_raw(Box::into_raw(self) as *mut Slice) };
648 OsString { inner: Buf::from_box(boxed) }
651 /// Gets the underlying byte representation.
653 /// Note: it is *crucial* that this API is private, to avoid
654 /// revealing the internal, platform-specific encodings.
655 fn bytes(&self) -> &[u8] {
656 unsafe { &*(&self.inner as *const _ as *const [u8]) }
660 #[stable(feature = "box_from_os_str", since = "1.17.0")]
661 impl From<&OsStr> for Box<OsStr> {
662 fn from(s: &OsStr) -> Box<OsStr> {
663 let rw = Box::into_raw(s.inner.into_box()) as *mut OsStr;
664 unsafe { Box::from_raw(rw) }
668 #[stable(feature = "os_string_from_box", since = "1.18.0")]
669 impl From<Box<OsStr>> for OsString {
670 /// Converts a `Box<OsStr>` into a `OsString` without copying or allocating.
672 /// [`Box`]: ../boxed/struct.Box.html
673 /// [`OsString`]: ../ffi/struct.OsString.html
674 fn from(boxed: Box<OsStr>) -> OsString {
675 boxed.into_os_string()
679 #[stable(feature = "box_from_os_string", since = "1.20.0")]
680 impl From<OsString> for Box<OsStr> {
681 /// Converts a [`OsString`] into a [`Box`]`<OsStr>` without copying or allocating.
683 /// [`Box`]: ../boxed/struct.Box.html
684 /// [`OsString`]: ../ffi/struct.OsString.html
685 fn from(s: OsString) -> Box<OsStr> {
686 s.into_boxed_os_str()
690 #[stable(feature = "more_box_slice_clone", since = "1.29.0")]
691 impl Clone for Box<OsStr> {
693 fn clone(&self) -> Self {
694 self.to_os_string().into_boxed_os_str()
698 #[stable(feature = "shared_from_slice2", since = "1.24.0")]
699 impl From<OsString> for Arc<OsStr> {
700 /// Converts a [`OsString`] into a [`Arc`]`<OsStr>` without copying or allocating.
702 /// [`Arc`]: ../sync/struct.Arc.html
703 /// [`OsString`]: ../ffi/struct.OsString.html
705 fn from(s: OsString) -> Arc<OsStr> {
706 let arc = s.inner.into_arc();
707 unsafe { Arc::from_raw(Arc::into_raw(arc) as *const OsStr) }
711 #[stable(feature = "shared_from_slice2", since = "1.24.0")]
712 impl From<&OsStr> for Arc<OsStr> {
714 fn from(s: &OsStr) -> Arc<OsStr> {
715 let arc = s.inner.into_arc();
716 unsafe { Arc::from_raw(Arc::into_raw(arc) as *const OsStr) }
720 #[stable(feature = "shared_from_slice2", since = "1.24.0")]
721 impl From<OsString> for Rc<OsStr> {
722 /// Converts a [`OsString`] into a [`Rc`]`<OsStr>` without copying or allocating.
724 /// [`Rc`]: ../rc/struct.Rc.html
725 /// [`OsString`]: ../ffi/struct.OsString.html
727 fn from(s: OsString) -> Rc<OsStr> {
728 let rc = s.inner.into_rc();
729 unsafe { Rc::from_raw(Rc::into_raw(rc) as *const OsStr) }
733 #[stable(feature = "shared_from_slice2", since = "1.24.0")]
734 impl From<&OsStr> for Rc<OsStr> {
736 fn from(s: &OsStr) -> Rc<OsStr> {
737 let rc = s.inner.into_rc();
738 unsafe { Rc::from_raw(Rc::into_raw(rc) as *const OsStr) }
742 #[stable(feature = "cow_from_osstr", since = "1.28.0")]
743 impl<'a> From<OsString> for Cow<'a, OsStr> {
745 fn from(s: OsString) -> Cow<'a, OsStr> {
750 #[stable(feature = "cow_from_osstr", since = "1.28.0")]
751 impl<'a> From<&'a OsStr> for Cow<'a, OsStr> {
753 fn from(s: &'a OsStr) -> Cow<'a, OsStr> {
758 #[stable(feature = "cow_from_osstr", since = "1.28.0")]
759 impl<'a> From<&'a OsString> for Cow<'a, OsStr> {
761 fn from(s: &'a OsString) -> Cow<'a, OsStr> {
762 Cow::Borrowed(s.as_os_str())
766 #[stable(feature = "osstring_from_cow_osstr", since = "1.28.0")]
767 impl<'a> From<Cow<'a, OsStr>> for OsString {
769 fn from(s: Cow<'a, OsStr>) -> Self {
774 #[stable(feature = "box_default_extra", since = "1.17.0")]
775 impl Default for Box<OsStr> {
776 fn default() -> Box<OsStr> {
777 let rw = Box::into_raw(Slice::empty_box()) as *mut OsStr;
778 unsafe { Box::from_raw(rw) }
782 #[stable(feature = "osstring_default", since = "1.9.0")]
783 impl Default for &OsStr {
784 /// Creates an empty `OsStr`.
786 fn default() -> Self {
791 #[stable(feature = "rust1", since = "1.0.0")]
792 impl PartialEq for OsStr {
793 fn eq(&self, other: &OsStr) -> bool {
794 self.bytes().eq(other.bytes())
798 #[stable(feature = "rust1", since = "1.0.0")]
799 impl PartialEq<str> for OsStr {
800 fn eq(&self, other: &str) -> bool {
801 *self == *OsStr::new(other)
805 #[stable(feature = "rust1", since = "1.0.0")]
806 impl PartialEq<OsStr> for str {
807 fn eq(&self, other: &OsStr) -> bool {
808 *other == *OsStr::new(self)
812 #[stable(feature = "rust1", since = "1.0.0")]
815 #[stable(feature = "rust1", since = "1.0.0")]
816 impl PartialOrd for OsStr {
818 fn partial_cmp(&self, other: &OsStr) -> Option<cmp::Ordering> {
819 self.bytes().partial_cmp(other.bytes())
822 fn lt(&self, other: &OsStr) -> bool { self.bytes().lt(other.bytes()) }
824 fn le(&self, other: &OsStr) -> bool { self.bytes().le(other.bytes()) }
826 fn gt(&self, other: &OsStr) -> bool { self.bytes().gt(other.bytes()) }
828 fn ge(&self, other: &OsStr) -> bool { self.bytes().ge(other.bytes()) }
831 #[stable(feature = "rust1", since = "1.0.0")]
832 impl PartialOrd<str> for OsStr {
834 fn partial_cmp(&self, other: &str) -> Option<cmp::Ordering> {
835 self.partial_cmp(OsStr::new(other))
839 // FIXME (#19470): cannot provide PartialOrd<OsStr> for str until we
840 // have more flexible coherence rules.
842 #[stable(feature = "rust1", since = "1.0.0")]
845 fn cmp(&self, other: &OsStr) -> cmp::Ordering { self.bytes().cmp(other.bytes()) }
848 macro_rules! impl_cmp {
849 ($lhs:ty, $rhs: ty) => {
850 #[stable(feature = "cmp_os_str", since = "1.8.0")]
851 impl<'a, 'b> PartialEq<$rhs> for $lhs {
853 fn eq(&self, other: &$rhs) -> bool { <OsStr as PartialEq>::eq(self, other) }
856 #[stable(feature = "cmp_os_str", since = "1.8.0")]
857 impl<'a, 'b> PartialEq<$lhs> for $rhs {
859 fn eq(&self, other: &$lhs) -> bool { <OsStr as PartialEq>::eq(self, other) }
862 #[stable(feature = "cmp_os_str", since = "1.8.0")]
863 impl<'a, 'b> PartialOrd<$rhs> for $lhs {
865 fn partial_cmp(&self, other: &$rhs) -> Option<cmp::Ordering> {
866 <OsStr as PartialOrd>::partial_cmp(self, other)
870 #[stable(feature = "cmp_os_str", since = "1.8.0")]
871 impl<'a, 'b> PartialOrd<$lhs> for $rhs {
873 fn partial_cmp(&self, other: &$lhs) -> Option<cmp::Ordering> {
874 <OsStr as PartialOrd>::partial_cmp(self, other)
880 impl_cmp!(OsString, OsStr);
881 impl_cmp!(OsString, &'a OsStr);
882 impl_cmp!(Cow<'a, OsStr>, OsStr);
883 impl_cmp!(Cow<'a, OsStr>, &'b OsStr);
884 impl_cmp!(Cow<'a, OsStr>, OsString);
886 #[stable(feature = "rust1", since = "1.0.0")]
887 impl Hash for OsStr {
889 fn hash<H: Hasher>(&self, state: &mut H) {
890 self.bytes().hash(state)
894 #[stable(feature = "rust1", since = "1.0.0")]
895 impl fmt::Debug for OsStr {
896 fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
897 fmt::Debug::fmt(&self.inner, formatter)
902 pub(crate) fn display(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
903 fmt::Display::fmt(&self.inner, formatter)
907 #[stable(feature = "rust1", since = "1.0.0")]
908 impl Borrow<OsStr> for OsString {
909 fn borrow(&self) -> &OsStr { &self[..] }
912 #[stable(feature = "rust1", since = "1.0.0")]
913 impl ToOwned for OsStr {
914 type Owned = OsString;
915 fn to_owned(&self) -> OsString {
918 fn clone_into(&self, target: &mut OsString) {
924 #[stable(feature = "rust1", since = "1.0.0")]
925 impl AsRef<OsStr> for OsStr {
926 fn as_ref(&self) -> &OsStr {
931 #[stable(feature = "rust1", since = "1.0.0")]
932 impl AsRef<OsStr> for OsString {
933 fn as_ref(&self) -> &OsStr {
938 #[stable(feature = "rust1", since = "1.0.0")]
939 impl AsRef<OsStr> for str {
940 fn as_ref(&self) -> &OsStr {
941 OsStr::from_inner(Slice::from_str(self))
945 #[stable(feature = "rust1", since = "1.0.0")]
946 impl AsRef<OsStr> for String {
947 fn as_ref(&self) -> &OsStr {
952 impl FromInner<Buf> for OsString {
953 fn from_inner(buf: Buf) -> OsString {
954 OsString { inner: buf }
958 impl IntoInner<Buf> for OsString {
959 fn into_inner(self) -> Buf {
964 impl AsInner<Slice> for OsStr {
966 fn as_inner(&self) -> &Slice {
974 use crate::sys_common::{AsInner, IntoInner};
977 use crate::sync::Arc;
980 fn test_os_string_with_capacity() {
981 let os_string = OsString::with_capacity(0);
982 assert_eq!(0, os_string.inner.into_inner().capacity());
984 let os_string = OsString::with_capacity(10);
985 assert_eq!(10, os_string.inner.into_inner().capacity());
987 let mut os_string = OsString::with_capacity(0);
988 os_string.push("abc");
989 assert!(os_string.inner.into_inner().capacity() >= 3);
993 fn test_os_string_clear() {
994 let mut os_string = OsString::from("abc");
995 assert_eq!(3, os_string.inner.as_inner().len());
998 assert_eq!(&os_string, "");
999 assert_eq!(0, os_string.inner.as_inner().len());
1003 fn test_os_string_capacity() {
1004 let os_string = OsString::with_capacity(0);
1005 assert_eq!(0, os_string.capacity());
1007 let os_string = OsString::with_capacity(10);
1008 assert_eq!(10, os_string.capacity());
1010 let mut os_string = OsString::with_capacity(0);
1011 os_string.push("abc");
1012 assert!(os_string.capacity() >= 3);
1016 fn test_os_string_reserve() {
1017 let mut os_string = OsString::new();
1018 assert_eq!(os_string.capacity(), 0);
1020 os_string.reserve(2);
1021 assert!(os_string.capacity() >= 2);
1024 os_string.push("a");
1027 assert!(os_string.capacity() >= 16);
1028 os_string.reserve(16);
1029 assert!(os_string.capacity() >= 32);
1031 os_string.push("a");
1033 os_string.reserve(16);
1034 assert!(os_string.capacity() >= 33)
1038 fn test_os_string_reserve_exact() {
1039 let mut os_string = OsString::new();
1040 assert_eq!(os_string.capacity(), 0);
1042 os_string.reserve_exact(2);
1043 assert!(os_string.capacity() >= 2);
1046 os_string.push("a");
1049 assert!(os_string.capacity() >= 16);
1050 os_string.reserve_exact(16);
1051 assert!(os_string.capacity() >= 32);
1053 os_string.push("a");
1055 os_string.reserve_exact(16);
1056 assert!(os_string.capacity() >= 33)
1060 fn test_os_string_default() {
1061 let os_string: OsString = Default::default();
1062 assert_eq!("", &os_string);
1066 fn test_os_str_is_empty() {
1067 let mut os_string = OsString::new();
1068 assert!(os_string.is_empty());
1070 os_string.push("abc");
1071 assert!(!os_string.is_empty());
1074 assert!(os_string.is_empty());
1078 fn test_os_str_len() {
1079 let mut os_string = OsString::new();
1080 assert_eq!(0, os_string.len());
1082 os_string.push("abc");
1083 assert_eq!(3, os_string.len());
1086 assert_eq!(0, os_string.len());
1090 fn test_os_str_default() {
1091 let os_str: &OsStr = Default::default();
1092 assert_eq!("", os_str);
1097 let orig = "Hello, world!";
1098 let os_str = OsStr::new(orig);
1099 let boxed: Box<OsStr> = Box::from(os_str);
1100 let os_string = os_str.to_owned().into_boxed_os_str().into_os_string();
1101 assert_eq!(os_str, &*boxed);
1102 assert_eq!(&*boxed, &*os_string);
1103 assert_eq!(&*os_string, os_str);
1107 fn boxed_default() {
1108 let boxed = <Box<OsStr>>::default();
1109 assert!(boxed.is_empty());
1113 fn test_os_str_clone_into() {
1114 let mut os_string = OsString::with_capacity(123);
1115 os_string.push("hello");
1116 let os_str = OsStr::new("bonjour");
1117 os_str.clone_into(&mut os_string);
1118 assert_eq!(os_str, os_string);
1119 assert!(os_string.capacity() >= 123);
1124 let orig = "Hello, world!";
1125 let os_str = OsStr::new(orig);
1126 let rc: Rc<OsStr> = Rc::from(os_str);
1127 let arc: Arc<OsStr> = Arc::from(os_str);
1129 assert_eq!(&*rc, os_str);
1130 assert_eq!(&*arc, os_str);
1132 let rc2: Rc<OsStr> = Rc::from(os_str.to_owned());
1133 let arc2: Arc<OsStr> = Arc::from(os_str.to_owned());
1135 assert_eq!(&*rc2, os_str);
1136 assert_eq!(&*arc2, os_str);