intcmp(1): initial rust impl
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src/intcmp.rs
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78
src/intcmp.rs
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/*
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* Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
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* SPDX-License-Identifier: AGPL-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 Affero 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 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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// /* 0b00? */ /* Equal | -e | 0b001 | 1 */
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// #define EQUAL 0x01 /* Greater | -g | 0b010 | 2 */
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// /* 0b0?0 */ /* Greater or Equal | -ge | 0b011 | 3 */
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// #define GREATER 0x02 /* Less | -l | 0b100 | 4 */
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// /* 0b?00 */ /* Less or Equal | -le | 0b101 | 5 */
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// #define LESS 0x04 /* Inequal (Greater or Less) | -gl | 0b110 | 6 */
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use std::{
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env::args,
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process::ExitCode
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};
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fn usage(s: &str) -> ExitCode {
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eprintln!("Usage: {} [-egl] integer integer...", s);
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ExitCode::from(EX_USAGE as u8)
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}
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fn main() -> ExitCode {
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let argv = args().collect::<Vec<String>>();
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let mut can_eq = false;
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let mut can_gt = false;
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let mut can_lt = false;
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let mut optind = 0;
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if argv.len() < 3 { return usage(&argv[0]); }
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while let Some(opt) = argv.getopt("egl") {
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match opt.opt() {
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Ok("e") => can_eq = true,
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Ok("g") => can_gt = true,
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Ok("l") => can_lt = true,
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_ => { return usage(&argv[0]); },
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}
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optind = opt.ind();
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}
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if argv.len() - optind < 2 /* ref cmp */ { return usage(&argv[0]); }
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let mut reference = None;
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let mut cmpn: usize;
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for arg in argv.iter().skip(optind) {
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match arg.parse::<usize>() {
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Ok(n) => cmpn = n,
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_ => {
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eprintln!("{}: {}: Invalid integer", &argv[0], arg);
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return ExitCode::from(EX_USAGE as u8);
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}
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}
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if let Some(refn) = reference {
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if (!can_eq && refn == cmpn)
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|| (!can_gt && refn > cmpn)
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|| (!can_lt && refn < cmpn)
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{ return ExitCode::FAILURE; }
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}
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}
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ExitCode::SUCCESS
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}
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