53 lines
2.0 KiB
Rust
53 lines
2.0 KiB
Rust
// Copyright 2021, The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Native helpers for composd.
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pub use art::*;
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mod art {
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use anyhow::{anyhow, Result};
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use libc::c_char;
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use std::ffi::{CStr, OsStr};
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use std::io::Error;
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use std::os::unix::ffi::OsStrExt;
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use std::path::Path;
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use std::ptr::null;
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// From libartpalette(-system)
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extern "C" {
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fn PaletteCreateOdrefreshStagingDirectory(out_staging_dir: *mut *const c_char) -> i32;
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}
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const PALETTE_STATUS_OK: i32 = 0;
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const PALETTE_STATUS_CHECK_ERRNO: i32 = 1;
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/// Creates and returns the staging directory for odrefresh.
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pub fn palette_create_odrefresh_staging_directory() -> Result<&'static Path> {
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let mut staging_dir: *const c_char = null();
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// SAFETY: The C function always returns a non-null C string (after created the directory).
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let status = unsafe { PaletteCreateOdrefreshStagingDirectory(&mut staging_dir) };
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match status {
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PALETTE_STATUS_OK => {
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// SAFETY: The previously returned `*const c_char` should point to a legitimate C
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// string.
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let cstr = unsafe { CStr::from_ptr(staging_dir) };
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let path = OsStr::from_bytes(cstr.to_bytes()).as_ref();
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Ok(path)
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}
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PALETTE_STATUS_CHECK_ERRNO => Err(anyhow!(Error::last_os_error().to_string())),
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_ => Err(anyhow!("Failed with palette status {}", status)),
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}
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}
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}
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