87 lines
2.8 KiB
Rust
87 lines
2.8 KiB
Rust
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/*
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* Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
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* SPDX-License-Identifier: LGPL-3.0-or-later
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*
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* This program is free software: you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see https://www.gnu.org/licenses/.
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*
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* This file incorporates work covered by the following copyright and permission
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* notice:
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*
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* Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
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* SPDX-License-Identifier: FSFAP
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*
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* Copying and distribution of this file, with or without modification, are
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* permitted in any medium without royalty provided the copyright notice and
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* this notice are preserved. This file is offered as-is, without any
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* warranty.
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*/
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use std::{
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io::{ self, Write },
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process::{ Command, exit, Stdio },
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path::PathBuf,
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};
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use bindgen::{ Builder, CargoCallbacks, MacroTypeVariation };
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fn main() -> Result<(), io::Error> {
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let mut header = String::new();
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/* bindgen has a dependency on clang for now */
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Command::new("clang").spawn().expect("Missing dependency: clang");
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/* Locate sysexits.h using cpp(1) */
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let mut process = Command::new("cpp")
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.arg("-M")
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.stdin(Stdio::piped())
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.stdout(Stdio::piped())
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.spawn()?;
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if let Some(mut child_stdin) = process.stdin.take() {
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child_stdin.write_all("#include <sysexits.h>\n".as_bytes())?;
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}
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let output = process.wait_with_output()?.stdout;
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let headers = String::from_utf8(output).unwrap_or_else( |_| {
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eprintln!("Output from cpp(1) is invalid UTF-8.");
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/* Exit with status 1 because we’re bootstrapping sysexits.h, silly! */
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exit(1);
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});
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/* Split headers by spaces because cpp(1) returns more than one */
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for h in headers.split(' ') {
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if h.contains("sysexits.h") {
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header = h.trim().to_string();
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/* If sysexits.h cannot be located, then use the dummy sysexits.h */
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} else { header = "src/sysexits.h".to_string() }
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}
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/* Make sysexits bindings depend only on core and use signed integers for
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* compatibility with Rust’s exit() implementation */
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let bindings = Builder::default()
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.use_core()
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.default_macro_constant_type(MacroTypeVariation::Signed)
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.header(header)
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.parse_callbacks(Box::new(CargoCallbacks::new()))
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.generate()
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.expect("Unable to generate bindings.");
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bindings
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.write_to_file(PathBuf::from("src/").join("lib.rs"))
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.expect("Couldn't write bindings!");
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Ok(())
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}
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