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rust: Remove empty_static_cstr() in favour of new cstr!() macro.

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Isis Lovecruft 2018-02-10 01:41:06 +00:00
parent 6c77593a57
commit 081e99c16f
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GPG Key ID: B8938BC5E86C046F
2 changed files with 1 additions and 41 deletions
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3
src/rust/protover/ffi.rs
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@ -13,7 +13,6 @@ use protover::*;
use smartlist::*; use smartlist::*;
use tor_allocate::allocate_and_copy_string; use tor_allocate::allocate_and_copy_string;
use tor_util::strings::byte_slice_is_c_like; use tor_util::strings::byte_slice_is_c_like;
use tor_util::strings::empty_static_cstr;
/// Translate C enums to Rust Proto enums, using the integer value of the C /// Translate C enums to Rust Proto enums, using the integer value of the C
/// enum to map to its associated Rust enum /// enum to map to its associated Rust enum
@ -192,7 +191,7 @@ pub extern "C" fn protover_compute_for_old_tor(version: *const c_char) -> *const
let supported: &'static CStr; let supported: &'static CStr;
let empty: &'static CStr; let empty: &'static CStr;
empty = empty_static_cstr(); empty = cstr!("");
if version.is_null() { if version.is_null() {
return empty.as_ptr(); return empty.as_ptr();

39
src/rust/tor_util/strings.rs
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@ -3,8 +3,6 @@
//! Utilities for working with static strings. //! Utilities for working with static strings.
use std::ffi::CStr;
/// A byte-array containing a single NUL byte (`b"\0"`). /// A byte-array containing a single NUL byte (`b"\0"`).
pub const NUL_BYTE: &'static [u8] = b"\0"; pub const NUL_BYTE: &'static [u8] = b"\0";
@ -44,43 +42,6 @@ pub fn byte_slice_is_c_like(bytes: &[u8]) -> bool {
false false
} }
/// Get a static `CStr` containing a single `NUL_BYTE`.
///
/// # Examples
///
/// When used as follows in a Rust FFI function, which could be called
/// from C:
///
/// ```
/// # extern crate libc;
/// # extern crate tor_util;
/// #
/// # use tor_util::strings::empty_static_cstr;
/// use libc::c_char;
/// use std::ffi::CStr;
///
/// pub extern "C" fn give_c_code_an_empty_static_string() -> *const c_char {
/// let empty: &'static CStr = empty_static_cstr();
///
/// empty.as_ptr()
/// }
///
/// # fn main() {
/// # give_c_code_an_empty_static_string();
/// # }
/// ```
///
/// This equates to an "empty" `const char*` static string in C.
pub fn empty_static_cstr() -> &'static CStr {
let empty: &'static CStr;
unsafe {
empty = CStr::from_bytes_with_nul_unchecked(NUL_BYTE);
}
empty
}
/// Create a `CStr` from a literal byte slice, appending a NUL byte to it first. /// Create a `CStr` from a literal byte slice, appending a NUL byte to it first.
/// ///
/// # Warning /// # Warning