diff options
Diffstat (limited to 'src/rust/c_string')
| -rw-r--r-- | src/rust/c_string/Cargo.toml | 13 | ||||
| -rw-r--r-- | src/rust/c_string/ffi.rs | 19 | ||||
| -rw-r--r-- | src/rust/c_string/include.am | 12 |
3 files changed, 44 insertions, 0 deletions
diff --git a/src/rust/c_string/Cargo.toml b/src/rust/c_string/Cargo.toml new file mode 100644 index 0000000000..dc7504856b --- /dev/null +++ b/src/rust/c_string/Cargo.toml @@ -0,0 +1,13 @@ +[package] +authors = ["The Tor Project"] +version = "0.0.1" +name = "c_string" + +[dependencies] +libc = "0.2.22" + +[lib] +name = "c_string" +path = "ffi.rs" +crate_type = ["rlib", "staticlib"] + diff --git a/src/rust/c_string/ffi.rs b/src/rust/c_string/ffi.rs new file mode 100644 index 0000000000..edce250829 --- /dev/null +++ b/src/rust/c_string/ffi.rs @@ -0,0 +1,19 @@ +//! FFI functions, only to be called from C. +//! +//! This module provides the ability for C to free strings that have been +//! allocated in Rust. + +extern crate libc; + +use libc::c_char; +use std::ffi::CString; + +/// This allows strings allocated in Rust to be freed in Rust. Every string +/// sent across the Rust/C FFI boundary should utilize this function for +/// freeing strings allocated in Rust. +#[no_mangle] +pub extern "C" fn free_rust_str(ptr: *mut c_char) { + if !ptr.is_null() { + unsafe { CString::from_raw(ptr) }; + } +} diff --git a/src/rust/c_string/include.am b/src/rust/c_string/include.am new file mode 100644 index 0000000000..8e9229ae6a --- /dev/null +++ b/src/rust/c_string/include.am @@ -0,0 +1,12 @@ +EXTRA_DIST +=\ + src/rust/c_string/Cargo.toml \ + src/rust/c_string/ffi.rs + +src/rust/target/release/@TOR_RUST_C_STRING_STATIC_NAME@: FORCE + ( cd "$(abs_top_srcdir)/src/rust/c_string" ; \ + CARGO_TARGET_DIR="$(abs_top_builddir)/src/rust/target" \ + CARGO_HOME="$(abs_top_builddir)/src/rust" \ + $(CARGO) build --release --quiet $(CARGO_ONLINE) ) + +FORCE: + |