Struct std::ffi::NulError

1.64.0 · source ·

pub struct NulError(_, _);

Expand description

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"f0円oo".to_vec()).unwrap_err();

Run

Implementations

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impl NulError

1.0.0 · source

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("foo0円bar").unwrap_err();
assert_eq!(nul_error.nul_position(), 3);
let nul_error = CString::new("foo bar0円").unwrap_err();
assert_eq!(nul_error.nul_position(), 7);

Run

1.0.0 · source

pub fn into_vec(self) -> Vec<u8, Global>iNotable traits for Vec<u8, A>impl<A: Allocator> Write for Vec<u8, A>

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("foo0円bar").unwrap_err();
assert_eq!(nul_error.into_vec(), b"foo0円bar");

Run

Trait Implementations

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impl Clone for NulError

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fn clone(&self) -> NulError

Returns a copy of the value. Read more

1.0.0 · source

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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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

1.0.0 · source

impl Display for NulError

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more

1.0.0 · source

impl Error for NulError

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fn description(&self) -> &str

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

Read more

1.30.0 · source

fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any. Read more

1.0.0 · source

fn cause(&self) -> Option<&dyn Error>

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

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fn provide<'a>(&'a self, req: &mut Demand<'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

1.0.0 · source

impl From<NulError> for Error

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fn from(_: NulError) -> Error

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

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impl PartialEq<NulError> for NulError

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fn eq(&self, other: &NulError) -> bool

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

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fn ne(&self, other: &NulError) -> bool

This method tests for !=.

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impl Eq for NulError

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impl StructuralEq for NulError

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impl StructuralPartialEq for NulError