1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 use borrow::{Cow, ToOwned, Borrow};
14 use convert::{Into, From};
15 use cmp::{PartialEq, Eq, PartialOrd, Ord, Ordering};
17 use fmt::{self, Write};
24 use option::Option::{self, Some, None};
26 use result::Result::{self, Ok, Err};
28 use str::{self, Utf8Error};
32 /// A type representing an owned C-compatible string
34 /// This type serves the primary purpose of being able to safely generate a
35 /// C-compatible string from a Rust byte slice or vector. An instance of this
36 /// type is a static guarantee that the underlying bytes contain no interior 0
37 /// bytes and the final byte is 0.
39 /// A `CString` is created from either a byte slice or a byte vector. After
40 /// being created, a `CString` predominately inherits all of its methods from
41 /// the `Deref` implementation to `[c_char]`. Note that the underlying array
42 /// is represented as an array of `c_char` as opposed to `u8`. A `u8` slice
43 /// can be obtained with the `as_bytes` method. Slices produced from a `CString`
44 /// do *not* contain the trailing nul terminator unless otherwise specified.
50 /// use std::ffi::CString;
51 /// use std::os::raw::c_char;
54 /// fn my_printer(s: *const c_char);
57 /// let c_to_print = CString::new("Hello, world!").unwrap();
59 /// my_printer(c_to_print.as_ptr());
66 /// `CString` is intended for working with traditional C-style strings
67 /// (a sequence of non-null bytes terminated by a single null byte); the
68 /// primary use case for these kinds of strings is interoperating with C-like
69 /// code. Often you will need to transfer ownership to/from that external
70 /// code. It is strongly recommended that you thoroughly read through the
71 /// documentation of `CString` before use, as improper ownership management
72 /// of `CString` instances can lead to invalid memory accesses, memory leaks,
73 /// and other memory errors.
75 #[derive(PartialEq, PartialOrd, Eq, Ord, Hash, Clone)]
76 #[stable(feature = "rust1", since = "1.0.0")]
81 /// Representation of a borrowed C string.
83 /// This dynamically sized type is only safely constructed via a borrowed
84 /// version of an instance of `CString`. This type can be constructed from a raw
85 /// C string as well and represents a C string borrowed from another location.
87 /// Note that this structure is **not** `repr(C)` and is not recommended to be
88 /// placed in the signatures of FFI functions. Instead safe wrappers of FFI
89 /// functions may leverage the unsafe `from_ptr` constructor to provide a safe
90 /// interface to other consumers.
94 /// Inspecting a foreign C string
97 /// use std::ffi::CStr;
98 /// use std::os::raw::c_char;
100 /// extern { fn my_string() -> *const c_char; }
104 /// let slice = CStr::from_ptr(my_string());
105 /// println!("string length: {}", slice.to_bytes().len());
110 /// Passing a Rust-originating C string
113 /// use std::ffi::{CString, CStr};
114 /// use std::os::raw::c_char;
116 /// fn work(data: &CStr) {
117 /// extern { fn work_with(data: *const c_char); }
119 /// unsafe { work_with(data.as_ptr()) }
123 /// let s = CString::new("data data data data").unwrap();
128 /// Converting a foreign C string into a Rust `String`
131 /// use std::ffi::CStr;
132 /// use std::os::raw::c_char;
134 /// extern { fn my_string() -> *const c_char; }
136 /// fn my_string_safe() -> String {
138 /// CStr::from_ptr(my_string()).to_string_lossy().into_owned()
143 /// println!("string: {}", my_string_safe());
147 #[stable(feature = "rust1", since = "1.0.0")]
149 // FIXME: this should not be represented with a DST slice but rather with
150 // just a raw `c_char` along with some form of marker to make
151 // this an unsized type. Essentially `sizeof(&CStr)` should be the
152 // same as `sizeof(&c_char)` but `CStr` should be an unsized type.
156 /// An error returned from `CString::new` to indicate that a nul byte was found
157 /// in the vector provided.
158 #[derive(Clone, PartialEq, Debug)]
159 #[stable(feature = "rust1", since = "1.0.0")]
160 pub struct NulError(usize, Vec<u8>);
162 /// An error returned from `CStr::from_bytes_with_nul` to indicate that a nul
163 /// byte was found too early in the slice provided or one wasn't found at all.
164 #[derive(Clone, PartialEq, Debug)]
165 #[stable(feature = "cstr_from_bytes", since = "1.10.0")]
166 pub struct FromBytesWithNulError { _a: () }
168 /// An error returned from `CString::into_string` to indicate that a UTF-8 error
169 /// was encountered during the conversion.
170 #[derive(Clone, PartialEq, Debug)]
171 #[stable(feature = "cstring_into", since = "1.7.0")]
172 pub struct IntoStringError {
178 /// Creates a new C-compatible string from a container of bytes.
180 /// This method will consume the provided data and use the underlying bytes
181 /// to construct a new string, ensuring that there is a trailing 0 byte.
186 /// use std::ffi::CString;
187 /// use std::os::raw::c_char;
189 /// extern { fn puts(s: *const c_char); }
192 /// let to_print = CString::new("Hello!").unwrap();
194 /// puts(to_print.as_ptr());
201 /// This function will return an error if the bytes yielded contain an
202 /// internal 0 byte. The error returned will contain the bytes as well as
203 /// the position of the nul byte.
204 #[stable(feature = "rust1", since = "1.0.0")]
205 pub fn new<T: Into<Vec<u8>>>(t: T) -> Result<CString, NulError> {
209 fn _new(bytes: Vec<u8>) -> Result<CString, NulError> {
210 match memchr::memchr(0, &bytes) {
211 Some(i) => Err(NulError(i, bytes)),
212 None => Ok(unsafe { CString::from_vec_unchecked(bytes) }),
216 /// Creates a C-compatible string from a byte vector without checking for
217 /// interior 0 bytes.
219 /// This method is equivalent to `new` except that no runtime assertion
220 /// is made that `v` contains no 0 bytes, and it requires an actual
221 /// byte vector, not anything that can be converted to one with Into.
222 #[stable(feature = "rust1", since = "1.0.0")]
223 pub unsafe fn from_vec_unchecked(mut v: Vec<u8>) -> CString {
225 CString { inner: v.into_boxed_slice() }
228 /// Retakes ownership of a `CString` that was transferred to C.
230 /// This should only ever be called with a pointer that was earlier
231 /// obtained by calling `into_raw` on a `CString`. Additionally, the length
232 /// of the string will be recalculated from the pointer.
233 #[stable(feature = "cstr_memory", since = "1.4.0")]
234 pub unsafe fn from_raw(ptr: *mut c_char) -> CString {
235 let len = libc::strlen(ptr) + 1; // Including the NUL byte
236 let slice = slice::from_raw_parts(ptr, len as usize);
237 CString { inner: mem::transmute(slice) }
240 /// Transfers ownership of the string to a C caller.
242 /// The pointer must be returned to Rust and reconstituted using
243 /// `from_raw` to be properly deallocated. Specifically, one
244 /// should *not* use the standard C `free` function to deallocate
247 /// Failure to call `from_raw` will lead to a memory leak.
248 #[stable(feature = "cstr_memory", since = "1.4.0")]
249 pub fn into_raw(self) -> *mut c_char {
250 Box::into_raw(self.inner) as *mut c_char
253 /// Converts the `CString` into a `String` if it contains valid Unicode data.
255 /// On failure, ownership of the original `CString` is returned.
256 #[stable(feature = "cstring_into", since = "1.7.0")]
257 pub fn into_string(self) -> Result<String, IntoStringError> {
258 String::from_utf8(self.into_bytes())
259 .map_err(|e| IntoStringError {
260 error: e.utf8_error(),
261 inner: unsafe { CString::from_vec_unchecked(e.into_bytes()) },
265 /// Returns the underlying byte buffer.
267 /// The returned buffer does **not** contain the trailing nul separator and
268 /// it is guaranteed to not have any interior nul bytes.
269 #[stable(feature = "cstring_into", since = "1.7.0")]
270 pub fn into_bytes(self) -> Vec<u8> {
271 let mut vec = self.inner.into_vec();
272 let _nul = vec.pop();
273 debug_assert_eq!(_nul, Some(0u8));
277 /// Equivalent to the `into_bytes` function except that the returned vector
278 /// includes the trailing nul byte.
279 #[stable(feature = "cstring_into", since = "1.7.0")]
280 pub fn into_bytes_with_nul(self) -> Vec<u8> {
281 self.inner.into_vec()
284 /// Returns the contents of this `CString` as a slice of bytes.
286 /// The returned slice does **not** contain the trailing nul separator and
287 /// it is guaranteed to not have any interior nul bytes.
288 #[stable(feature = "rust1", since = "1.0.0")]
289 pub fn as_bytes(&self) -> &[u8] {
290 &self.inner[..self.inner.len() - 1]
293 /// Equivalent to the `as_bytes` function except that the returned slice
294 /// includes the trailing nul byte.
295 #[stable(feature = "rust1", since = "1.0.0")]
296 pub fn as_bytes_with_nul(&self) -> &[u8] {
301 #[stable(feature = "rust1", since = "1.0.0")]
302 impl ops::Deref for CString {
305 fn deref(&self) -> &CStr {
306 unsafe { mem::transmute(self.as_bytes_with_nul()) }
310 #[stable(feature = "rust1", since = "1.0.0")]
311 impl fmt::Debug for CString {
312 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
313 fmt::Debug::fmt(&**self, f)
317 #[stable(feature = "cstring_into", since = "1.7.0")]
318 impl From<CString> for Vec<u8> {
319 fn from(s: CString) -> Vec<u8> {
324 #[stable(feature = "cstr_debug", since = "1.3.0")]
325 impl fmt::Debug for CStr {
326 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
328 for byte in self.to_bytes().iter().flat_map(|&b| ascii::escape_default(b)) {
329 f.write_char(byte as char)?;
335 #[stable(feature = "cstr_default", since = "1.10.0")]
336 impl<'a> Default for &'a CStr {
337 fn default() -> &'a CStr {
338 static SLICE: &'static [c_char] = &[0];
339 unsafe { CStr::from_ptr(SLICE.as_ptr()) }
343 #[stable(feature = "cstr_default", since = "1.10.0")]
344 impl Default for CString {
345 fn default() -> CString {
346 let a: &CStr = Default::default();
351 #[stable(feature = "cstr_borrow", since = "1.3.0")]
352 impl Borrow<CStr> for CString {
353 fn borrow(&self) -> &CStr { self }
357 /// Returns the position of the nul byte in the slice that was provided to
363 /// use std::ffi::CString;
365 /// let nul_error = CString::new("foo\0bar").unwrap_err();
366 /// assert_eq!(nul_error.nul_position(), 3);
368 /// let nul_error = CString::new("foo bar\0").unwrap_err();
369 /// assert_eq!(nul_error.nul_position(), 7);
371 #[stable(feature = "rust1", since = "1.0.0")]
372 pub fn nul_position(&self) -> usize { self.0 }
374 /// Consumes this error, returning the underlying vector of bytes which
375 /// generated the error in the first place.
380 /// use std::ffi::CString;
382 /// let nul_error = CString::new("foo\0bar").unwrap_err();
383 /// assert_eq!(nul_error.into_vec(), b"foo\0bar");
385 #[stable(feature = "rust1", since = "1.0.0")]
386 pub fn into_vec(self) -> Vec<u8> { self.1 }
389 #[stable(feature = "rust1", since = "1.0.0")]
390 impl Error for NulError {
391 fn description(&self) -> &str { "nul byte found in data" }
394 #[stable(feature = "rust1", since = "1.0.0")]
395 impl fmt::Display for NulError {
396 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
397 write!(f, "nul byte found in provided data at position: {}", self.0)
401 #[stable(feature = "rust1", since = "1.0.0")]
402 impl From<NulError> for io::Error {
403 fn from(_: NulError) -> io::Error {
404 io::Error::new(io::ErrorKind::InvalidInput,
405 "data provided contains a nul byte")
409 impl IntoStringError {
410 /// Consumes this error, returning original `CString` which generated the
412 #[stable(feature = "cstring_into", since = "1.7.0")]
413 pub fn into_cstring(self) -> CString {
417 /// Access the underlying UTF-8 error that was the cause of this error.
418 #[stable(feature = "cstring_into", since = "1.7.0")]
419 pub fn utf8_error(&self) -> Utf8Error {
424 #[stable(feature = "cstring_into", since = "1.7.0")]
425 impl Error for IntoStringError {
426 fn description(&self) -> &str {
427 "C string contained non-utf8 bytes"
430 fn cause(&self) -> Option<&Error> {
435 #[stable(feature = "cstring_into", since = "1.7.0")]
436 impl fmt::Display for IntoStringError {
437 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
438 self.description().fmt(f)
443 /// Casts a raw C string to a safe C string wrapper.
445 /// This function will cast the provided `ptr` to the `CStr` wrapper which
446 /// allows inspection and interoperation of non-owned C strings. This method
447 /// is unsafe for a number of reasons:
449 /// * There is no guarantee to the validity of `ptr`
450 /// * The returned lifetime is not guaranteed to be the actual lifetime of
452 /// * There is no guarantee that the memory pointed to by `ptr` contains a
453 /// valid nul terminator byte at the end of the string.
455 /// > **Note**: This operation is intended to be a 0-cost cast but it is
456 /// > currently implemented with an up-front calculation of the length of
457 /// > the string. This is not guaranteed to always be the case.
463 /// use std::ffi::CStr;
464 /// use std::os::raw::c_char;
467 /// fn my_string() -> *const c_char;
471 /// let slice = CStr::from_ptr(my_string());
472 /// println!("string returned: {}", slice.to_str().unwrap());
476 #[stable(feature = "rust1", since = "1.0.0")]
477 pub unsafe fn from_ptr<'a>(ptr: *const c_char) -> &'a CStr {
478 let len = libc::strlen(ptr);
479 mem::transmute(slice::from_raw_parts(ptr, len as usize + 1))
482 /// Creates a C string wrapper from a byte slice.
484 /// This function will cast the provided `bytes` to a `CStr` wrapper after
485 /// ensuring that it is null terminated and does not contain any interior
491 /// use std::ffi::CStr;
493 /// let cstr = CStr::from_bytes_with_nul(b"hello\0");
494 /// assert!(cstr.is_ok());
496 #[stable(feature = "cstr_from_bytes", since = "1.10.0")]
497 pub fn from_bytes_with_nul(bytes: &[u8])
498 -> Result<&CStr, FromBytesWithNulError> {
499 if bytes.is_empty() || memchr::memchr(0, &bytes) != Some(bytes.len() - 1) {
500 Err(FromBytesWithNulError { _a: () })
502 Ok(unsafe { Self::from_bytes_with_nul_unchecked(bytes) })
506 /// Unsafely creates a C string wrapper from a byte slice.
508 /// This function will cast the provided `bytes` to a `CStr` wrapper without
509 /// performing any sanity checks. The provided slice must be null terminated
510 /// and not contain any interior nul bytes.
515 /// use std::ffi::{CStr, CString};
518 /// let cstring = CString::new("hello").unwrap();
519 /// let cstr = CStr::from_bytes_with_nul_unchecked(cstring.to_bytes_with_nul());
520 /// assert_eq!(cstr, &*cstring);
523 #[stable(feature = "cstr_from_bytes", since = "1.10.0")]
524 pub unsafe fn from_bytes_with_nul_unchecked(bytes: &[u8]) -> &CStr {
525 mem::transmute(bytes)
528 /// Returns the inner pointer to this C string.
530 /// The returned pointer will be valid for as long as `self` is and points
531 /// to a contiguous region of memory terminated with a 0 byte to represent
532 /// the end of the string.
536 /// It is your responsibility to make sure that the underlying memory is not
537 /// freed too early. For example, the following code will cause undefined
538 /// behaviour when `ptr` is used inside the `unsafe` block:
541 /// use std::ffi::{CString};
543 /// let ptr = CString::new("Hello").unwrap().as_ptr();
545 /// // `ptr` is dangling
550 /// This happens because the pointer returned by `as_ptr` does not carry any
551 /// lifetime information and the string is deallocated immediately after
552 /// the `CString::new("Hello").unwrap().as_ptr()` expression is evaluated.
553 /// To fix the problem, bind the string to a local variable:
556 /// use std::ffi::{CString};
558 /// let hello = CString::new("Hello").unwrap();
559 /// let ptr = hello.as_ptr();
561 /// // `ptr` is valid because `hello` is in scope
565 #[stable(feature = "rust1", since = "1.0.0")]
566 pub fn as_ptr(&self) -> *const c_char {
570 /// Converts this C string to a byte slice.
572 /// This function will calculate the length of this string (which normally
573 /// requires a linear amount of work to be done) and then return the
574 /// resulting slice of `u8` elements.
576 /// The returned slice will **not** contain the trailing nul that this C
579 /// > **Note**: This method is currently implemented as a 0-cost cast, but
580 /// > it is planned to alter its definition in the future to perform the
581 /// > length calculation whenever this method is called.
582 #[stable(feature = "rust1", since = "1.0.0")]
583 pub fn to_bytes(&self) -> &[u8] {
584 let bytes = self.to_bytes_with_nul();
585 &bytes[..bytes.len() - 1]
588 /// Converts this C string to a byte slice containing the trailing 0 byte.
590 /// This function is the equivalent of `to_bytes` except that it will retain
591 /// the trailing nul instead of chopping it off.
593 /// > **Note**: This method is currently implemented as a 0-cost cast, but
594 /// > it is planned to alter its definition in the future to perform the
595 /// > length calculation whenever this method is called.
596 #[stable(feature = "rust1", since = "1.0.0")]
597 pub fn to_bytes_with_nul(&self) -> &[u8] {
598 unsafe { mem::transmute(&self.inner) }
601 /// Yields a `&str` slice if the `CStr` contains valid UTF-8.
603 /// This function will calculate the length of this string and check for
604 /// UTF-8 validity, and then return the `&str` if it's valid.
606 /// > **Note**: This method is currently implemented to check for validity
607 /// > after a 0-cost cast, but it is planned to alter its definition in the
608 /// > future to perform the length calculation in addition to the UTF-8
609 /// > check whenever this method is called.
610 #[stable(feature = "cstr_to_str", since = "1.4.0")]
611 pub fn to_str(&self) -> Result<&str, str::Utf8Error> {
612 // NB: When CStr is changed to perform the length check in .to_bytes()
613 // instead of in from_ptr(), it may be worth considering if this should
614 // be rewritten to do the UTF-8 check inline with the length calculation
615 // instead of doing it afterwards.
616 str::from_utf8(self.to_bytes())
619 /// Converts a `CStr` into a `Cow<str>`.
621 /// This function will calculate the length of this string (which normally
622 /// requires a linear amount of work to be done) and then return the
623 /// resulting slice as a `Cow<str>`, replacing any invalid UTF-8 sequences
624 /// with `U+FFFD REPLACEMENT CHARACTER`.
626 /// > **Note**: This method is currently implemented to check for validity
627 /// > after a 0-cost cast, but it is planned to alter its definition in the
628 /// > future to perform the length calculation in addition to the UTF-8
629 /// > check whenever this method is called.
630 #[stable(feature = "cstr_to_str", since = "1.4.0")]
631 pub fn to_string_lossy(&self) -> Cow<str> {
632 String::from_utf8_lossy(self.to_bytes())
636 #[stable(feature = "rust1", since = "1.0.0")]
637 impl PartialEq for CStr {
638 fn eq(&self, other: &CStr) -> bool {
639 self.to_bytes().eq(other.to_bytes())
642 #[stable(feature = "rust1", since = "1.0.0")]
644 #[stable(feature = "rust1", since = "1.0.0")]
645 impl PartialOrd for CStr {
646 fn partial_cmp(&self, other: &CStr) -> Option<Ordering> {
647 self.to_bytes().partial_cmp(&other.to_bytes())
650 #[stable(feature = "rust1", since = "1.0.0")]
652 fn cmp(&self, other: &CStr) -> Ordering {
653 self.to_bytes().cmp(&other.to_bytes())
657 #[stable(feature = "cstr_borrow", since = "1.3.0")]
658 impl ToOwned for CStr {
659 type Owned = CString;
661 fn to_owned(&self) -> CString {
662 unsafe { CString::from_vec_unchecked(self.to_bytes().to_vec()) }
666 #[stable(feature = "cstring_asref", since = "1.7.0")]
667 impl<'a> From<&'a CStr> for CString {
668 fn from(s: &'a CStr) -> CString {
673 #[stable(feature = "cstring_asref", since = "1.7.0")]
674 impl ops::Index<ops::RangeFull> for CString {
678 fn index(&self, _index: ops::RangeFull) -> &CStr {
683 #[stable(feature = "cstring_asref", since = "1.7.0")]
684 impl AsRef<CStr> for CStr {
685 fn as_ref(&self) -> &CStr {
690 #[stable(feature = "cstring_asref", since = "1.7.0")]
691 impl AsRef<CStr> for CString {
692 fn as_ref(&self) -> &CStr {
702 use borrow::Cow::{Borrowed, Owned};
703 use hash::{SipHasher, Hash, Hasher};
708 let ptr = data.as_ptr() as *const c_char;
710 assert_eq!(CStr::from_ptr(ptr).to_bytes(), b"123");
711 assert_eq!(CStr::from_ptr(ptr).to_bytes_with_nul(), b"123\0");
717 let s = CString::new("1234").unwrap();
718 assert_eq!(s.as_bytes(), b"1234");
719 assert_eq!(s.as_bytes_with_nul(), b"1234\0");
723 fn build_with_zero1() {
724 assert!(CString::new(&b"\0"[..]).is_err());
727 fn build_with_zero2() {
728 assert!(CString::new(vec![0]).is_err());
732 fn build_with_zero3() {
734 let s = CString::from_vec_unchecked(vec![0]);
735 assert_eq!(s.as_bytes(), b"\0");
741 let s = CString::new(&b"abc\x01\x02\n\xE2\x80\xA6\xFF"[..]).unwrap();
742 assert_eq!(format!("{:?}", s), r#""abc\x01\x02\n\xe2\x80\xa6\xff""#);
748 let s = CStr::from_ptr(b"12\0".as_ptr() as *const _);
749 assert_eq!(s.to_bytes(), b"12");
750 assert_eq!(s.to_bytes_with_nul(), b"12\0");
756 let data = b"123\xE2\x80\xA6\0";
757 let ptr = data.as_ptr() as *const c_char;
759 assert_eq!(CStr::from_ptr(ptr).to_str(), Ok("123…"));
760 assert_eq!(CStr::from_ptr(ptr).to_string_lossy(), Borrowed("123…"));
762 let data = b"123\xE2\0";
763 let ptr = data.as_ptr() as *const c_char;
765 assert!(CStr::from_ptr(ptr).to_str().is_err());
766 assert_eq!(CStr::from_ptr(ptr).to_string_lossy(), Owned::<str>(format!("123\u{FFFD}")));
773 let ptr = data.as_ptr() as *const c_char;
775 let owned = unsafe { CStr::from_ptr(ptr).to_owned() };
776 assert_eq!(owned.as_bytes_with_nul(), data);
781 let data = b"123\xE2\xFA\xA6\0";
782 let ptr = data.as_ptr() as *const c_char;
783 let cstr: &'static CStr = unsafe { CStr::from_ptr(ptr) };
785 let mut s = SipHasher::new_with_keys(0, 0);
787 let cstr_hash = s.finish();
788 let mut s = SipHasher::new_with_keys(0, 0);
789 CString::new(&data[..data.len() - 1]).unwrap().hash(&mut s);
790 let cstring_hash = s.finish();
792 assert_eq!(cstr_hash, cstring_hash);
796 fn from_bytes_with_nul() {
798 let cstr = CStr::from_bytes_with_nul(data);
799 assert_eq!(cstr.map(CStr::to_bytes), Ok(&b"123"[..]));
800 let cstr = CStr::from_bytes_with_nul(data);
801 assert_eq!(cstr.map(CStr::to_bytes_with_nul), Ok(&b"123\0"[..]));
804 let cstr = CStr::from_bytes_with_nul(data);
805 let cstr_unchecked = CStr::from_bytes_with_nul_unchecked(data);
806 assert_eq!(cstr, Ok(cstr_unchecked));
811 fn from_bytes_with_nul_unterminated() {
813 let cstr = CStr::from_bytes_with_nul(data);
814 assert!(cstr.is_err());
818 fn from_bytes_with_nul_interior() {
819 let data = b"1\023\0";
820 let cstr = CStr::from_bytes_with_nul(data);
821 assert!(cstr.is_err());