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rust-nodemap: add binding for `nodemap_data_incremental`...
rust-nodemap: add binding for `nodemap_data_incremental` Differential Revision: https://phab.mercurial-scm.org/D8159

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re2.rs
66 lines | 1.6 KiB | application/rls-services+xml | RustLexer
/*
re2.rs
Rust FFI bindings to Re2.
Copyright 2020 Valentin Gatien-Baron
This software may be used and distributed according to the terms of the
GNU General Public License version 2 or any later version.
*/
use libc::{c_int, c_void};
type Re2Ptr = *const c_void;
pub struct Re2(Re2Ptr);
/// `re2.h` says:
/// "An "RE2" object is safe for concurrent use by multiple threads."
unsafe impl Sync for Re2 {}
/// These bind to the C ABI in `rust_re2.cpp`.
extern "C" {
fn rust_re2_create(data: *const u8, len: usize) -> Re2Ptr;
fn rust_re2_destroy(re2: Re2Ptr);
fn rust_re2_ok(re2: Re2Ptr) -> bool;
fn rust_re2_error(
re2: Re2Ptr,
outdata: *mut *const u8,
outlen: *mut usize,
) -> bool;
fn rust_re2_match(
re2: Re2Ptr,
data: *const u8,
len: usize,
anchor: c_int,
) -> bool;
}
impl Re2 {
pub fn new(pattern: &[u8]) -> Result<Re2, String> {
unsafe {
let re2 = rust_re2_create(pattern.as_ptr(), pattern.len());
if rust_re2_ok(re2) {
Ok(Re2(re2))
} else {
let mut data: *const u8 = std::ptr::null();
let mut len: usize = 0;
rust_re2_error(re2, &mut data, &mut len);
Err(String::from_utf8_lossy(std::slice::from_raw_parts(
data, len,
))
.to_string())
}
}
}
pub fn is_match(&self, data: &[u8]) -> bool {
unsafe { rust_re2_match(self.0, data.as_ptr(), data.len(), 1) }
}
}
impl Drop for Re2 {
fn drop(&mut self) {
unsafe { rust_re2_destroy(self.0) }
}
}