Merge branch libfileis

src/fileis.rs

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2024 DTB <trinity@trinity.moe>
+ * Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ *
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Affero General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see https://www.gnu.org/licenses/.
+ */
+
+use std::{
+	env::args,
+	fs::metadata,
+	os::unix::fs::{ FileTypeExt, MetadataExt },
+	process::ExitCode,
+};
+
+extern crate getopt;
+extern crate strerror;
+extern crate sysexits;
+
+use getopt::GetOpt;
+use strerror::StrError;
+use sysexits::EX_USAGE;
+
+const OPTS: &str = "bcdefgkprsuwxLS";
+
+fn usage(argv0: &str) -> ExitCode {
+	eprintln!("Usage: {} [-{}] file...", argv0, OPTS);
+	ExitCode::from(EX_USAGE)
+}
+
+fn main() -> ExitCode {
+	let argv = args().collect::<Vec<_>>();
+
+	let mut sel = String::with_capacity(OPTS.len()); // selected options
+	let mut optind: usize = 1; // argv[0]
+
+	while let Some(opt) = argv.getopt(OPTS) {
+		if let Ok(optchr) = opt.opt() { sel.push_str(optchr); }
+		else { return usage(&argv[0]); }
+
+		optind = opt.ind();
+	}
+
+	if optind == argv.len() { return usage(&argv[0]); }
+
+	for arg in argv.iter().skip(optind) {
+		let fmeta = match metadata(arg) {
+			Ok(m) => m,
+			Err(e) => { // no perms or nonexistent
+				eprintln!("{}: {}: {}", argv[0], arg, e.strerror());
+				return ExitCode::FAILURE;
+			},
+		};
+
+		let fmode = fmeta.mode();
+		let ftype = fmeta.file_type();
+
+		for selection in sel.chars() { // run all selected tests
+			match selection {
+				'b' if ftype.is_block_device() => (),
+				'c' if ftype.is_char_device() => (),
+				'e' => (), // exists or metadata would have errored
+				'd' if fmeta.is_dir() => (),
+				'f' if fmeta.is_file() => (),
+				'g' if fmode & 0o2000 /* S_ISGID */ != 0 => (), // setgid
+				'k' if fmode & 0o1000 /* S_ISVTX */ != 0 => (), // setvtx
+				'p' if ftype.is_fifo() => (),
+				'r' if fmode & 0o0400 /* S_IRUSR */ != 0 => (), // read access
+				'u' if fmode & 0o4000 /* S_ISUID */ != 0 => (), // setuid
+				'w' if fmode & 0o0200 /* S_IWUSR */ != 0 => (), // write access
+				'x' if fmode & 0o0100 /* S_IXUSR */ != 0 => (), // exec access
+				'L' if fmeta.is_symlink() => (),
+				'S' if ftype.is_socket() => (),
+				_ => { return ExitCode::FAILURE; }
+			}
+		}
+	}
+
+	ExitCode::SUCCESS
+}