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Struct NulError 

pub struct NulError(/* private fields */);

An error indicating that an interior nul byte was found.

While Rust strings may contain nul bytes in the middle, C strings can’t, as that byte would effectively truncate the string.

This error is created by the new method on CString. See its documentation for more.

Examples

use std::ffi::{CString, NulError};

let _: NulError = CString::new(b"f\0oo".to_vec()).unwrap_err();

Implementations

Source
impl NulError
1.0.0Source
pub fn nul_position(&self) -> usize

Returns the position of the nul byte in the slice that caused CString::new to fail.

Examples
use std::ffi::CString;

let nul_error = CString::new("foo\0bar").unwrap_err();
assert_eq!(nul_error.nul_position(), 3);

let nul_error = CString::new("foo bar\0").unwrap_err();
assert_eq!(nul_error.nul_position(), 7);
1.0.0Source
pub fn into_vec(self) -> Vec<u8> ⓘ

Consumes this error, returning the underlying vector of bytes which generated the error in the first place.

Examples
use std::ffi::CString;

let nul_error = CString::new("foo\0bar").unwrap_err();
assert_eq!(nul_error.into_vec(), b"foo\0bar");

Trait Implementations

1.64.0Source
impl Clone for NulError
Source
fn clone(&self) -> NulError
Returns a duplicate of the value. Read more
1.0.0Source
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source. Read more
1.64.0Source
impl Debug for NulError
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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
Formats the value using the given formatter. Read more
1.0.0Source
impl Display for NulError
Source
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
Formats the value using the given formatter. Read more
1.0.0Source
impl Error for NulError
1.30.0Source
fn source(&self) -> Option<&(dyn Error + 'static)>
Returns the lower-level source of this error, if any. Read more
1.0.0Source
fn description(&self) -> &str
👎Deprecated since 1.42.0: use the Display impl or to_string()
Read more
1.0.0Source
fn cause(&self) -> Option<&dyn Error>
👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
Source
fn provide<'a>(&'a self, request: &mut Request<'a>)
🔬This is a nightly-only experimental API. (error_generic_member_access #99301)
Provides type-based access to context intended for error reports. Read more
1.0.0Source
impl From<NulError> for Error
Source
fn from(_: NulError) -> Error

Converts a alloc::ffi::NulError into a Error.

1.64.0Source
impl PartialEq for NulError
Source
fn eq(&self, other: &NulError) -> bool
Tests for self and other values to be equal, and is used by ==.
1.0.0Source
fn ne(&self, other: &Rhs) -> bool
Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.64.0Source
impl Eq for NulError
1.64.0Source
impl StructuralPartialEq for NulError

Auto Trait Implementations

impl Freeze for NulError
impl RefUnwindSafe for NulError
impl Send for NulError
impl Sync for NulError
impl Unpin for NulError
impl UnwindSafe for NulError

Blanket Implementations

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impl<T> Any for Twhere
    T: 'static + ?Sized,
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fn type_id(&self) -> TypeId
Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere
    T: ?Sized,
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fn borrow(&self) -> &T
Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere
    T: ?Sized,
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fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for Twhere
    T: Clone,
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unsafe fn clone_to_uninit(&self, dest: *mut u8)
🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T
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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere
    U: From<T>,
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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere
    T: Clone,
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type Owned = T
The resulting type after obtaining ownership.
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fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)
Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for Twhere
    T: Display + ?Sized,
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fn to_string(&self) -> String
Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for Twhere
    U: Into<T>,
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type Error = Infallible
The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
Performs the conversion.
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impl<T, U> TryInto<U> for Twhere
    U: TryFrom<T>,
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type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
Performs the conversion.

© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/ffi/c_str/struct.NulError.html