99 lines
2.6 KiB
Rust
99 lines
2.6 KiB
Rust
// Copyright (c) 2022 YAC
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// SPDX-License-Identifier: AGPL-3.0-or-later
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/* This file is part of YAC coreutils.
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*
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* YAC coreutils is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Affero General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* YAC coreutils 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 Affero 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 Affero 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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use std::env;
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use std::fs::{File, read_to_string};
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use std::io;
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use std::io::{ BufRead, Write };
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use std::os::unix::io::FromRawFd;
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use arg::Args;
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use sysexits::ExitCode;
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#[derive(Args, Debug)]
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struct Arguments {
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#[arg(short = "u")]
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u: bool,
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paths: Vec<String>,
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}
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fn out(argv0: &str, u: bool, val: &str) -> ExitCode {
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if u {
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let mut stdout = unsafe { File::from_raw_fd(1) };
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match stdout.write_all(val.as_bytes()) {
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Ok(_) => {},
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Err(_) => {
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eprintln!("{}: Cannot write to stdout", argv0);
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return ExitCode::OsErr;
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},
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};
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} else { print!("{}", val); }
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ExitCode::Ok
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}
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fn main() -> ExitCode {
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let mut arguments = env::args().collect::<Vec<String>>();
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let argv0 = arguments.remove(0);
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let mut args = Arguments::from_args(arguments
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.iter()
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.map(String::as_str)
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.collect::<Vec<&str>>()
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).unwrap();
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let mut output = String::new();
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if args.paths.is_empty() { args.paths.push("-".to_string()); }
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for path in args.paths {
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if path == "-" {
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loop {
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match io::stdin().lock().read_line(&mut output) {
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Ok(EOF) => {
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out(&argv0, args.u, &output);
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output.clear();
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if EOF == 0 { break }
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},
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Err(_) => {
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eprintln!("Usage: {} [options...] [files...]", &argv0);
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return ExitCode::Usage;
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},
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};
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}
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} else {
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match read_to_string(&path) {
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Ok(output) => { out(&argv0, args.u, &output); },
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Err(_) => {
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eprintln!("{}: {}: No such file or directory.", &argv0, &path);
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return ExitCode::NoInput;
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},
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};
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}
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}
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match io::stdout().flush() {
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Ok(_) => return ExitCode::Ok,
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Err(_) => {
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eprintln!("{}: Cannot write to stdout", &argv0);
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return ExitCode::OsErr;
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},
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};
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}
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