110 lines
3.9 KiB
Rust
110 lines
3.9 KiB
Rust
/*
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* Copyright (c) 2023 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 file is part of SPD.
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*
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* SPD is free software: you can redistribute it and/or modify it under the
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* 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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* SPD is distributed in the hope that it will be useful, but WITHOUT ANY
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* 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 SPD. 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 2023 Douman
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*
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* Boost Software License - Version 1.0 - August 17th, 2003
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*
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* Permission is hereby granted, free of charge, to any person or
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* organization obtaining a copy of the software and accompanying
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* documentation covered by this license (the "Software") to use, reproduce,
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* display, distribute, execute, and transmit the Software, and to prepare
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* derivative works of the Software, and to permit third-parties to whom the
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* Software is furnished to do so, all subject to the following:
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*
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* The copyright notices in the Software and this entire statement,
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* including the above license grant, this restriction and the following
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* disclaimer, must be included in all copies of the Software, in whole or
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* in part, and all derivative works of the Software, unless such copies or
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* derivative works are solely in the form of machine-executable object code
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* generated by a source language processor.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
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* NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE
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* DISTRIBUTING THE SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER LIABILITY,
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* WHETHER IN CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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//! C main entry point with nice wrapper for arguments.
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//!
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//!```rust
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//!#![no_main]
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//!
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//!#[no_mangle]
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//!pub fn rust_main(args: c_main::Args) -> isize {
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//! for arg in args.into_iter().skip(1) {
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//! println!("arg={:?}", arg);
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//! }
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//! 0
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//!}
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//!```
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#![cfg_attr(feature = "cargo-clippy", allow(clippy::style))]
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#![cfg_attr(rustfmt, rustfmt_skip)]
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mod args;
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use args::*;
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#[allow(unused)]
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#[cold]
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#[inline(never)]
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unsafe fn invalid_cli_args_error() -> libc::c_int {
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libc::printf("Unable to parse C argv as utf-8 string\n\0".as_ptr() as _);
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255
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}
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///Converts C string to Rust's, verifying it is UTF-8
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///
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///It is UB to pass non-C string as it requires \0
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pub unsafe fn c_str_to_rust(ptr: *const u8) -> Result<&'static str, core::str::Utf8Error> {
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let len = libc::strlen(ptr as *const i8);
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let parts = core::slice::from_raw_parts(ptr, len);
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core::str::from_utf8(parts)
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}
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///Converts C string to Rust's one assuming it is UTF-8
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///
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///It is UB to pass non-C string as it requires \0
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pub unsafe fn c_str_to_rust_unchecked(ptr: *const u8) -> &'static str {
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let len = libc::strlen(ptr as *const i8);
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let parts = core::slice::from_raw_parts(ptr, len);
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core::str::from_utf8_unchecked(parts)
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}
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extern "Rust" {
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fn rust_main(args: Args) -> isize;
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}
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#[doc(hidden)]
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#[cfg(not(test))]
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#[no_mangle]
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pub unsafe extern fn main(argc: libc::c_int, argv: *const *const u8) -> libc::c_int {
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match Args::new(argc as isize, argv) {
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Ok(args) => rust_main(args) as _,
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Err(_) => invalid_cli_args_error(),
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}
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}
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