Makefile: removes deprecated variable

Makefile

@@ -1,4 +1,4 @@
-# Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
+# Copyright (c) 2023–2025 Emma Tebibyte <emma@tebibyte.media>
 # Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
 # Copyright (c) 2023 Sasha Koshka <sashakoshka@tebibyte.media>
 # Copyright (c) 2024 Aaditya Aryal <aryalaadi123@gmail.com>
@@ -42,7 +42,7 @@ BIN = build/bin
 default: all test
 
 .PHONY: all
-all: dj false fop hru intcmp mm npc peek rpn scrut str strcmp swab true
+all: dj false fileis fop hru intcmp mm npc peek rpn str strcmp swab true
 
 # keep build/include until bindgen(1) has stdin support
 # https://github.com/rust-lang/rust-bindgen/issues/2703
@@ -62,7 +62,12 @@ dist: all docs
 install: dist
 	cp -r $(DESTDIR)/* /
 
-include tests/tests.mk
+TESTFILES != for file in tests/*.mk; do printf '%s ' "$$file"; done
+
+TESTS != printf '%s\n' "$(TESTFILES)" | xargs -n1 basename \
+	| sed 's/\.mk/_tests/g'
+
+include $(TESTFILES)
 
 .PHONY: test
 test: all $(TESTS) /tmp/getopt
@@ -95,7 +100,7 @@ build/o/libstrerror.rlib: build src/libstrerror.rs
 		src/libstrerror.rs
 
 build/o/libsysexits.rlib: build/include/sysexits.h
-	bindgen --default-macro-constant-type signed --use-core --formatter=none \
+	bindgen --fit-macro-constant-types --default-macro-constant-type unsigned --use-core --formatter=none \
 		build/include/sysexits.h | $(RUSTC) $(RUSTFLAGS) --crate-type lib -o $@ -
 
 # bandage solution until bindgen(1) gets stdin support
@@ -112,6 +117,11 @@ false: build/bin/false
 build/bin/false: src/false.c build
 	$(CC) $(CFLAGS) -o $@ src/false.c
 
+.PHONY: fileis
+fileis: build/bin/fileis
+build/bin/fileis: src/fileis.rs build rustlibs
+	$(RUSTC) $(RUSTFLAGS) -o $@ src/fileis.rs
+
 .PHONY: fop
 fop: build/bin/fop
 build/bin/fop: src/fop.rs build rustlibs
@@ -147,11 +157,6 @@ rpn: build/bin/rpn
 build/bin/rpn: src/rpn.rs build rustlibs
 	$(RUSTC) $(RUSTFLAGS) -o $@ src/rpn.rs
 
-.PHONY: scrut
-scrut: build/bin/scrut
-build/bin/scrut: src/scrut.c build
-	$(CC) $(CFLAGS) -o $@ src/scrut.c
-
 .PHONY: str
 str: build/bin/str
 build/bin/str: src/str.c build

STYLE

@@ -1,11 +1,51 @@
+“Everyone knows that debugging is twice as hard as writing a program in the
+first place. So if you’re as clever as you can be when you write it, how
+will you ever debug it?”
+	– Brian Kernighan, The Elements of Programming Style
+
+
 The following guidelines are conducive to clear and readable code that is
 consistent with the style of the rest of the Bonsai Computer System.
 
-0. Braces are mandatory for all control flow.
 
-1. Nested indentation should be kept to a minimum.
+Use
+===
 
-2. Empty lines should be placed between different kinds of statements:
+ 0. A single line for control flow statements short enough to be easily
+ understood at a glance:
+
+	if !(argc < 0) { usage(program_name); }
+
+ This applies to C switch statements and cases and Rust match statements, as
+ well:
+
+	switch (value) { /* aligning stuff to make it easier to read is fine */
+		case possibility: variable = foo;  break;
+		default:          variable = NULL; break;
+	}
+
+ 1. Switch cases in C and match arms in Rust should start another level of
+ indentation:
+
+	switch (value) {
+		case possibility:
+			statement;
+			break;
+		default:
+			statement;
+			break;
+	}
+
+	match result {
+		Ok(n) => variable = n,
+		Err(e) => error = e,
+	}
+
+ 2. Braces in control flow where their inclusion is left optional in C:
+
+	if (condition) { statement; }
+
+ 3. Empty lines between different kinds of statements:
 
 	int t;
 
@@ -25,56 +65,57 @@ consistent with the style of the rest of the Bonsai Computer System.
 
 	return io;
 
-3. Each block of code should be indented once more than the keyword which
-initiated the block:
+ 4. Compiler options that yield the most useful warnings, such as -Wpedantic in
+ a lot of C compilers. Fix the warnings, too [0].
 
-	switch (c) {
-		case 'e': mode |= EQUAL;   break;
-		case 'g': mode |= GREATER; break;
-		case 'l': mode |= LESS;    break;
-		default:  return usage(s);
-	}
-
-4. In C, spaces should be placed in control flow statements after the keyword
-and before the opening brace:
-
-	for (i = 2; i < argc; ++i) {
-
-5. If a function, a C control flow statement, or a Rust macro has arguments that
-cause the statement to be broken into multiple lines, this should be done by
-placing the arguments on a new line inside the parentheses: 
+ 5. One more level of indentation and one argument per line when a function
+ call or statement header is too long to fit on one line:
 
 	let usage = format!(
 		"Usage: {} [-d delimiter] index command [args...]",
 		argv[0],
 	);
 
-6. If Rust function arguments or fields are on their own lines, they should
-always have a trailing comma:
+ 6. One more level of indentation than the keyword that initiated a multi-line
+ block.
+
+	if (condition) {
+		statement;
+		statement;
+	}
+
+ 7. The return value of all non-void functions, or explicitly ignore them (like
+ casting to void in C) [0]:
+
+	if ((a = malloc(sizeof char)) == NULL) {          /* handle this error */
+		(void)fprintf(stderr, "oh noes!");   /* explicitly ignore this one */
+		return EX_OSERR;       /* ...because the program is exiting anyway */
+	}
+
+ 8. The smallest possible scope for data [0].
+
+ 9. Comments noting all the symbols and macros used from a C header file, next
+ to its include macro:
+
+	#include <unistd.h> /* close(2), getopt(3), lseek(2), read(2), write(2),
+	(space-aligned)      * optarg, optind, STDIN_FILENO, STDOUT_FILENO */
+
+ 10. Spaces in control flow statements, after the keyword and before the
+ opening brace:
+
+	for (i = 2; i < argc; ++i) {
+
+
+ 11. In Rust, a trailing comma on all arguments or fields that are on their own
+ lines:
 
 	return Err(EvaluationError {
 		message: format!("{}: Invalid token", i),
 		code: EX_DATAERR,
 	})
 
-7. If text is on the same line as a brace, spaces should be placed after an
-opening curly brace and before a closing one:
-
-	use sysexits::{ EX_DATAERR, EX_IOERR, EX_UNAVAILABLE, EX_USAGE };
-
-8. If a control flow statement is short enough to be easily understood in a
-glance, it may be placed on a single line:
-
-	if !(argc < 0) { usage(program_name); }
-
-9. In C, note everything you use from a library in a comment subsequent to its
-#include statement:
-
-	#include <unistd.h> /* close(2), getopt(3), lseek(2), read(2), write(2),
-                         * optarg, optind, STDIN_FILENO, STDOUT_FILENO */
-
-10. In Rust, place extern statements after use statements that include standard
-library crates. Group alike statements:
+ 12. In Rust, place extern statements after use statements that include standard
+ library crates. Group like statements:
 
 	use std::fs::Path;
 
@@ -84,40 +125,129 @@ library crates. Group alike statements:
 	use strerror::StrError;
 	use sysexits::{ EX_OSERR, EX_USAGE };
 
-11. Do not use do while loops in C.
+ 13. If text is on the same line as a brace, spaces after an opening brace and
+ before a closing one:
 
-12. Adhere to the following rules from the paper The Power of 10: Rules for
-Developing Safety-Critical Code [0]:
-	1. Avoid complex flow constructs, such as goto and recursion.
-	2. All loops must have fixed bounds. This prevents runaway code.
-	3. Avoid heap memory allocation.
-	4. Restrict functions to the length of a single printed page.
+	use sysexits::{ EX_DATAERR, EX_IOERR, EX_UNAVAILABLE, EX_USAGE };
 
-	6. Restrict the scope of data to the smallest possible.
-	7. Check the return value of all non-void functions, or cast to void to
-	indicate the return value is useless (such as in the case of using
-	fprintf(3p)	to print to the standard error).
-	8. Use the preprocessor sparingly.
-	9. Limit pointer use to a single dereference, and do not use function
-	pointers.
-	10. Compile with all possible warnings active; all warnings should then be
-	addressed before release of the software (for C compilers, compile with
-	-Wpedantic).
+ 14. Alphabetic sorting, where applicable:
 
-13. Remember this quote from The Elements of Programming Style by Brian
-Kernighan:
-	Everyone knows that debugging is twice as hard as writing a program in the
-	first place. So if you're as clever as you can be when you write it, how
-	will you ever debug it?
+	use std::io::{ BufWriter, Read, Write, stderr, stdin, stdout }
+
+ 15. In Rust, use the to_owned() method on string types (str, OsStr, CStr, etc.)
+ and the to_string() method on other types.
+
+
+Avoid
+=====
+
+ 16. Unbounded loops [0].
+
+ 17. Function pointers [0].
+
+ 18. Heap memory allocation [0].
+
+ 19. Using too much nested logic (within reason).
+
+ 20. Too many levels of dereferences [0]:
+
+	/* do not do this */
+	for (size_t i = 0; i < sizeof a / sizeof *a; ++i) {
+		if (a[i].id == MATCH) { a[i].val = 0; }
+	}
+
+	/* do this */
+	for (struct MadeUp *s = &a[0]; *s != NULL; s = &s[1]) {
+		if (s->id == MATCH) { s->val = 0; }
+	}
+
+ 21. Using C preprocessor macros; the fewer, the better [0].
+
+ 22. The exit(3p) and std::process::exit() functions; returning from the main
+ function skips a system call.
+
+
+Do Not Use
+==========
+
+ 23. More than the length of one printed page for a function [0].
+
+ 24. Recursion, as it’s complex and can unexpectedly overflow the stack [0].
+
+ 25. Any functionality not in the POSIX C specification and language features not
+ in C99.
+
+ 26. Do-while loops, as they’re unique to C and confusing for casual programmers.
+
+ 27. Labels and goto statements; use sensible flow control [0].
+
+ 28. Pointer arithmetic, as it tends to be confusing and unnecessary; use
+ index-reference patterns like &p[1] instead of p + 1. &p[n] is the address at
+ p + sizeof p * n, not p + n, like pointer arithmetic suggests.
+
+ 29. C struct bitfields in unions, to access certain bits of bigger data types,
+ as it’s poorly defined in the C standards; use bit arithmetic.
+
+ 30. C trigraphs.
+
+ 31. Inclusions in C header files, to prevent multiple file inclusions.
+
+ 32. C preprocessor variables to prevent multiple inclusions of the same file,
+ such as:
+
+	#ifdef _FILE
+	#define _FILE
+	/* file body */
+	#endif /* ifdef _FILE */
+
+ Instead, take the time to ensure other files aren’t including any files twice.
+
+ 33. The gets(3p) function from <stdio.h>, as it’s impossible to prevent buffer
+ overflows when it's used; use fgets(3p) from <stdio.h>.
+
+ 34. The scanf(3p) function from <stdio.h> [1].
+
+ 35. Any functionality not described in the latest POSIX make(1) specification.
+
+ 36. Macros which panic on failure in Rust (such as the print!() and println!()
+ macros). Use a function and handle any errors. However, do use the eprintln!()
+ macro for error messages. Handling an error for writing an error message is
+ redundant.
+
+
+Usage Text
+==========
+
+This section is adapted from the NetBSD style guide [2].
+
+When programs are invoked incorrectly and in the synopsis of manual pages, uasge
+text should be provided to the user. The following is the format used by this
+project for this purpose:
+
+All optional arguments are to be placed in square brackets (U+005B, U+005D).
+Mutually exclusive arguments can be separated by a vertical line (U+007C).
+Groups of arguments should be specified in alphabetical order in most cases. The
+order of arguments and an example of these rules follows:
+
+ 0. Options with no option arguments.
+ 1. Options with option arguments. Arguments should be specified inside the same
+ square brackets as the options.
+ 3. Non-option arguments.
+
+	"usage: f [-aDde] [-b b_arg] [-m m_arg] req1 req2 [opt1 [opt2]]\n"
+	"usage: f [-a | -b] [-c [-de] [-n number]]\n"
 
 
 References
 ==========
 
 [0] <https://web.eecs.umich.edu/~imarkov/10rules.pdf>
+[1] <http://sekrit.de/webdocs/c/beginners-guide-away-from-scanf.html>
+[2] <http://cvsweb.netbsd.org/bsdweb.cgi/~checkout~/src/share/misc/style>
 
 --
 Copyright © 2024 Emma Tebibyte <emma@tebibyte.media>
+Copyright © 2024 DTB <trinity@trinity.moe>
 Copyright © Wikipedia contributors
 
 This work is licensed under CC BY-SA 4.0. To view a copy of this license, visit

docs/fileis.1

@@ -1,15 +1,15 @@
 .\" Copyright (c) 2024 DTB <trinity@trinity.moe>
-.\" Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
+.\" Copyright (c) 2024–2025 Emma Tebibyte <emma@tebibyte.media>
 .\"
 .\" This work is licensed under CC BY-SA 4.0. To see a copy of this license,
 .\" visit <http://creativecommons.org/licenses/by-sa/4.0/>.
 .\"
-.TH SCRUT 1 2024-06-06 "Harakit X.X.X"
+.TH FILEIS 1 2025-02-24 "Harakit X.X.X"
 .SH NAME
-scrut \(en scrutinize file properties
+fileis \(en scrutinize file properties
 .SH SYNOPSIS
 
-scrut
+fileis
 .RB [ -LSbcdefgkprsuwx ]
 .B file...
 .\"
@@ -82,5 +82,6 @@ Copyright \(co 2024 DTB. License AGPLv3+: GNU AGPL version 3 or later
 .\"
 .SH SEE ALSO
 .BR access (3p),
+.BR chown (1p),
 .BR lstat (3p),
 .BR test (1p)

src/false.c

@@ -13,7 +13,7 @@
 
 int main(void) {
 #ifdef __OpenBSD__
-	pledge(NULL, NULL);
+	(void)pledge("stdio", "");
 #endif
 	return 1;
 }

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
+}

src/fop.rs

@@ -18,8 +18,8 @@
 
 use std::{
 	env::args,
-	io::{ Read, stdin, stdout, Write },
-	process::{ Command, exit, Stdio },
+	io::{ Error, Read, Write, stdin, stdout },
+	process::{ Command, ExitCode, Stdio, exit },
 };
 
 extern crate getopt;
@@ -32,25 +32,36 @@ use sysexits::{ EX_DATAERR, EX_IOERR, EX_UNAVAILABLE, EX_USAGE };
 
 #[cfg(target_os="openbsd")] use sysexits::EX_OSERR;
 #[cfg(target_os="openbsd")] extern crate openbsd;
-#[cfg(target_os="openbsd")] use openbsd::{ Promises, pledge };
+#[cfg(target_os="openbsd")] use openbsd::{ Promises, pledge, unveil };
 
-fn main() {
+fn err(argv0: &String, e: Error) {
+	eprintln!("{}: {}", argv0, e.strerror());
+}
+
+fn usage(argv0: &String) -> u8 {
+	eprintln!("Usage: {} [-d delimiter] index command [args...]", argv0);
+	EX_USAGE
+}
+
+fn main() -> ExitCode {
 	let argv = args().collect::<Vec<String>>();
 	let mut d = '\u{1E}'.to_string(); /* ASCII record separator */
 	let mut optind = 1;
 
 	#[cfg(target_os="openbsd")] {
-		let promises = Promises::new("stdio proc exec");
+		let promises = Promises::new("exec proc stdio unveil");
 		if let Err(e) = pledge(Some(promises), None) {
-			eprintln!("{}: {}", argv[0], e.strerror());
-			exit(EX_OSERR);
+			err(&argv[0], e);
+			return ExitCode::from(EX_OSERR);
+		}
+
+		if let Err(e) = unveil(None, None) {
+			err(&argv[0], e);
+			return ExitCode::from(EX_OSERR);
 		}
 	}
 
-	let usage = format!(
-		"Usage: {} [-d delimiter] index command [args...]",
-		argv[0],
-	);
+	if argv.len() == 1 { return ExitCode::from(usage(&argv[0])); }
 
 	while let Some(opt) = argv.getopt("d:") {
 		match opt.opt() {
@@ -60,8 +71,7 @@ fn main() {
 				optind = opt.ind();
 			},
 			_ => {
-				eprintln!("{}", usage);
-				exit(EX_USAGE);
+				return ExitCode::from(usage(&argv[0]));
 			}
 		};
 	}
@@ -69,7 +79,7 @@ fn main() {
 	/* parse the specified index as a number we can use */
 	let index = argv[optind].parse::<usize>().unwrap_or_else(|e| {
 		eprintln!("{}: {}: {}", argv[0], argv[1], e);
-		exit(EX_DATAERR);
+		exit(EX_DATAERR.into());
 	});
 
 	/* index of the argv[0] for the operator command */
@@ -77,15 +87,14 @@ fn main() {
 
 	/* argv[0] of the operator command */
 	let operator = argv.get(command_arg).unwrap_or_else(|| {
-		eprintln!("{}", usage);
-		exit(EX_USAGE);
+		exit(usage(&argv[0]).into());
 	});
 
 	/* read entire standard input into memory */
 	let mut buf = String::new();
 	if let Err(e) = stdin().read_to_string(&mut buf) {
-		eprintln!("{}: {}", argv[0], e.strerror());
-		exit(EX_IOERR);
+		err(&argv[0], e);
+		exit(EX_IOERR.into());
 	};
 
 	/* split the buffer by the delimiter (by default, '\u{1E}') */
@@ -105,18 +114,14 @@ fn main() {
 		.stdout(Stdio::piped()) /* piped stdout to handle output ourselves */
 		.spawn()
 		.unwrap_or_else( |e| {
-			eprintln!("{}: {}: {}", argv[0], argv[command_arg], e.strerror());
-			exit(EX_UNAVAILABLE);
+			err(&argv[0], e);
+			exit(EX_UNAVAILABLE.into());
 		});
 
 	/* get field we want to pipe into spawned program */
 	let field = fields.get(index).unwrap_or_else(|| {
-		eprintln!(
-			"{}: {}: No such index in input",
-			argv[0],
-			index.to_string(),
-		);
-		exit(EX_DATAERR);
+		eprintln!("{}: {}: no such index in input", argv[0], index);
+		exit(EX_DATAERR.into());
 	});
 
 	/* get the stdin of the newly spawned program and feed it the field val */
@@ -126,8 +131,8 @@ fn main() {
 	}
 
 	let output = spawned.wait_with_output().unwrap_or_else(|e| {
-		eprintln!("{}: {}: {}", argv[0], argv[command_arg], e.strerror());
-		exit(EX_IOERR);
+		err(&argv[0], e);
+		exit(EX_IOERR.into());
 	});
 
 	/* get the output with which the original field will be replaced */
@@ -143,8 +148,8 @@ fn main() {
 
 	/* convert the output of the program to UTF-8 */
 	let new_field = String::from_utf8(replace).unwrap_or_else(|e| {
-		eprintln!("{}: {}: {}", argv[0], argv[command_arg], e);
-		exit(EX_IOERR);
+		eprintln!("{}: {}", argv[0], e);
+		exit(EX_IOERR.into());
 	});
 
 	/* store the new field in the old fields vector */
@@ -154,7 +159,9 @@ fn main() {
 	stdout().write_all(
 		fields.join(&d.to_string()).as_bytes()
 	).unwrap_or_else(|e| {
-		eprintln!("{}: {}", argv[0], e.strerror());
-		exit(EX_IOERR);
+		err(&argv[0], e);
+		exit(EX_IOERR.into());
 	});
+
+	ExitCode::SUCCESS
 }

src/hru.rs

@@ -19,7 +19,7 @@
 use std::{
 	cmp::Ordering,
 	env::args,
-	io::{ stdin, stdout, Write },
+	io::{ Write, stdin, stdout },
 	process::{ ExitCode, exit },
 };
 
@@ -31,7 +31,7 @@ use sysexits::{ EX_DATAERR, EX_IOERR, EX_SOFTWARE, EX_USAGE };
 
 #[cfg(target_os="openbsd")] use sysexits::EX_OSERR;
 #[cfg(target_os="openbsd")] extern crate openbsd;
-#[cfg(target_os="openbsd")] use openbsd::{ Promises, pledge };
+#[cfg(target_os="openbsd")] use openbsd::{ Promises, pledge, unveil };
 
 /* list of SI prefixes */
 const LIST: [(u32, &str); 10] = [
@@ -47,6 +47,16 @@ const LIST: [(u32, &str); 10] = [
 	(30, "Q"), /* quetta */
 ];
 
+fn err(argv0: &String, message: String, code: Option<u8>) -> ExitCode {
+	eprintln!("{}: {}", argv0, message);
+	ExitCode::from(code.unwrap_or(1 /* unknown error */))
+}
+
+fn usage(argv0: &String) -> ExitCode {
+	eprintln!("Usage: {}", argv0);
+	ExitCode::from(EX_USAGE)
+}
+
 fn convert(input: u128) -> Result<(f64, (u32, &'static str)), String> {
 	/* preserve decimal places in output by casting to a float */
 	let mut out = (input as f64, (0_u32, "")); 
@@ -81,53 +91,48 @@ fn convert(input: u128) -> Result<(f64, (u32, &'static str)), String> {
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<String>>();
 
-	if let Some(_) = argv.get(1) {
-		eprintln!("Usage: {}", argv[0]);
-		return ExitCode::from(EX_USAGE as u8);
-	}
+	if let Some(_) = argv.get(1) { return usage(&argv[0]); }
 
 	#[cfg(target_os="openbsd")] {
-		let promises = Promises::new("stdio");
-		if let Err(e) = pledge(Some(promises), None) {
-			eprintln!("{}: {}", argv[0], e.strerror());
-			return ExitCode::from(EX_OSERR as u8);
+		let promises = Promises::new("stdio unveil");
+		if let Err(e) = pledge(Some(promises), Some(Promises::default())) {
+			return err(&argv[0], e.strerror(), Some(EX_OSERR));
+		}
+
+		if let Err(e) = unveil(None, None) {
+			return err(&argv[0], e.strerror(), Some(EX_OSERR));
 		}
 	}
 
 	let mut buf = String::new();
 
-	while let Ok(_) = stdin().read_line(&mut buf) {
-		if buf.is_empty() { return ExitCode::SUCCESS; }
+	if let Err(e) = stdin().read_line(&mut buf) {
+		return err(&argv[0], e.strerror(), Some(EX_IOERR));
+	}
 
-		let n: u128 = match buf.trim().parse() {
-			Ok(f) => {
-				buf.clear();
-				f
-			},
-			Err(err) => {
-				eprintln!("{}: {}", argv[0], err);
-				return ExitCode::from(EX_DATAERR as u8);
-			},
-		};
+	if buf.is_empty() { return ExitCode::SUCCESS; }
 
-		let (number, prefix) = match convert(n) {
-			Ok(x) => x,
-			Err(err) => {
-				eprintln!("{}: {}", argv[0], err);
-				return ExitCode::from(EX_SOFTWARE as u8);
-			},
-		};
+	let n: u128 = match buf.trim().parse() {
+		Ok(f) => {
+			buf.clear();
+			f
+		},
+		Err(e) => return err(&argv[0], e.to_string(), Some(EX_DATAERR)),
+	};
 
-		let si_prefix = format!("{}B", prefix.1);
+	let (number, prefix) = convert(n).unwrap_or_else(|e| {
+		let _ = err(&argv[0], e.to_string(), None);
+		exit(EX_SOFTWARE.into());
+	});
 
-		/* round output number to one decimal place */
-		let out = ((number * 10.0).round() / 10.0).to_string();
+	let si_prefix = prefix.1.to_owned() + "B";
 
-		stdout().write_all(format!("{} {}\n", out, si_prefix).as_bytes())
-			.unwrap_or_else(|e| {
-				eprintln!("{}: {}", argv[0], e.strerror());
-				exit(EX_IOERR);
-			});
+	/* round output number to one decimal place */
+	let rounded = (number * 10.0).round() / 10.0;
+	let out = rounded.to_string() + " " + &si_prefix + &'\n'.to_string();
+
+	if let Err(e) = stdout().write_all(out.as_bytes()) {
+		return err(&argv[0], e.strerror(), Some(EX_IOERR));
 	}
 
 	ExitCode::SUCCESS

src/intcmp.rs

@@ -26,27 +26,35 @@ extern crate getopt;
 extern crate sysexits;
 
 use getopt::GetOpt;
-use sysexits::EX_USAGE;
+use sysexits::{ EX_DATAERR, EX_USAGE };
 
 #[cfg(target_os="openbsd")] use sysexits::EX_OSERR;
 #[cfg(target_os="openbsd")] extern crate openbsd;
 #[cfg(target_os="openbsd")] extern crate strerror;
-#[cfg(target_os="openbsd")] use openbsd::{ Promises, pledge };
+#[cfg(target_os="openbsd")] use openbsd::{ Promises, pledge, unveil };
 #[cfg(target_os="openbsd")] use strerror::StrError;
 
-fn usage(s: &str) -> ExitCode {
-	eprintln!("Usage: {} [-egl] integer integer...", s);
-	ExitCode::from(EX_USAGE as u8)
+fn err(argv0: &String, e: String, code: u8) -> ExitCode {
+	eprintln!("{}: {}", argv0, e);
+	ExitCode::from(code)
+}
+
+fn usage(argv0: &String) -> ExitCode {
+	eprintln!("Usage: {} [-egl] integer integer...", argv0);
+	ExitCode::from(EX_USAGE)
 }
 
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<String>>();
 
 	#[cfg(target_os="openbsd")] {
-		let promises = Promises::new("stdio");
-		if let Err(e) = pledge(Some(promises), None) {
-			eprintln!("{}: {}", argv[0], e.strerror());
-			return ExitCode::from(EX_OSERR as u8);
+		let promises = Promises::new("stdio unveil");
+		if let Err(e) = pledge(Some(promises), Some(Promises::default())) {
+			return err(&argv[0], e.strerror(), EX_OSERR);
+		}
+
+		if let Err(e) = unveil(None, None) {
+			return err(&argv[0], e.strerror(), EX_OSERR);
 		}
 	}
 
@@ -78,8 +86,8 @@ fn main() -> ExitCode {
 		match arg.parse::<usize>() { /* parse current operand */
 			Ok(n) => currn = n,
 			Err(e) => {
-				eprintln!("{}: {}: {}", &argv[0], arg, e);
-				return ExitCode::from(EX_USAGE as u8);
+				let error = arg.to_owned() + ": " + &e.to_string();
+				return err(&argv[0], error, EX_DATAERR);
 			}
 		}
 

src/libopenbsd.rs

@@ -43,6 +43,10 @@ impl Promises {
 	}
 }
 
+impl Default for Promises {
+	fn default() -> Self { Promises::new("") }
+}
+
 pub fn pledge(
 	promises: Option<Promises>, execpromises: Option<Promises>
 ) -> Result<(), Error> {
@@ -65,14 +69,12 @@ pub fn pledge(
 pub struct UnveilPerms(CString);
 
 impl UnveilPerms {
-	pub fn new(permissions: Vec<char>) -> Self {
-		if permissions.is_empty() {
-			return UnveilPerms(CString::new("").unwrap());
-		}
-
-		UnveilPerms(
-			CString::new(permissions.iter().collect::<String>()).unwrap()
-		)
+	pub fn new<T: IntoIterator<Item = char>>(permissions: T) -> Self {
+		let perms = CString::new(
+			permissions.into_iter().collect::<String>()
+		).unwrap();
+		
+		UnveilPerms(perms)
 	}
 }
 
@@ -83,9 +85,9 @@ pub fn unveil(
 	let path_c = path.map(CString::new).map(Result::unwrap);
 	let arg1 = path_c.map(|p| p.into_raw() as *const c_char).unwrap_or(null());
 
-	let arg2 = permissions
-		.map(|p| p.0.into_raw() as *const c_char)
-		.unwrap_or(null());
+	let arg2 = permissions.map(|p| {
+		p.0.into_raw() as *const c_char
+	}).unwrap_or(null());
 
 	unsafe {
 		match openbsd::unveil(arg1, arg2) {

src/mm.rs

@@ -20,9 +20,9 @@
 use std::{
 	env::args,
 	fs::File,
-	io::{ stdin, stdout, stderr, BufWriter, Read, Write },
+	io::{ Error, BufWriter, Read, Write, stderr, stdin, stdout },
 	os::fd::{ AsRawFd, FromRawFd },
-	process::{ exit, ExitCode },
+	process::{ ExitCode, exit},
 };
 
 extern crate getopt;
@@ -47,15 +47,23 @@ use ArgMode::*;
 
 enum ArgMode { In, Out }
 
+fn err(argv0: &String, e: Error, code: Option<u8>) -> ExitCode {
+	eprintln!("{}: {}", argv0, e.strerror());
+	ExitCode::from(code.unwrap_or(1 /* unknown error */))
+}
+
+fn usage(argv0: &String) -> ExitCode {
+	eprintln!("Usage: {} [-aetu] [-i input] [-o output]", argv0);
+	ExitCode::from(EX_USAGE)
+}
+
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<_>>();
-	let usage = format!("Usage: {} [-aetu] [-i input] [-o output]", argv[0]);
 
 	#[cfg(target_os="openbsd")] {
 		let promises = Promises::new("cpath rpath stdio unveil wpath");
-		if let Err(e) = pledge(Some(promises), None) {
-			eprintln!("{}: {}", argv[0], e.strerror());
-			return ExitCode::from(EX_OSERR as u8);
+		if let Err(e) = pledge(Some(promises), Some(Promises::default())) {
+			return err(&argv[0], e, Some(EX_OSERR));
 		}
 	}
 
@@ -85,8 +93,7 @@ fn main() -> ExitCode {
 				mode = Some(Out); /* latest argument == -o */
 			},
 			Err(_) | Ok(_) => {
-				eprintln!("{}", usage);
-				return ExitCode::from(EX_USAGE as u8);
+				return usage(&argv[0]);
 			},
 		};
 
@@ -108,32 +115,28 @@ fn main() -> ExitCode {
 
 	#[cfg(target_os="openbsd")] {
 		for input in &ins {
-			let perms = UnveilPerms::new(vec!['r']);
+			let perms = UnveilPerms::new(['r']);
 
 			if let Err(e) = unveil(Some(&input), Some(perms)) {
-				eprintln!("{}: {}", argv[0], e.strerror());
-				return ExitCode::from(EX_OSERR as u8);
+				return err(&argv[0], e, Some(EX_OSERR));
 			}
 		}
 
 		for output in &outs {
-			let perms = UnveilPerms::new(vec!['c', 'w']);
+			let perms = UnveilPerms::new(['c', 'w']);
 
 			if let Err(e) = unveil(Some(&output), Some(perms)) {
-				eprintln!("{}: {}", argv[0], e.strerror());
-				return ExitCode::from(EX_OSERR as u8);
+				return err(&argv[0], e, Some(EX_OSERR));
 			}
 		}
 
 		if let Err(e) = unveil(None, None) {
-			eprintln!("{}: {}", argv[0], e.strerror());
-			return ExitCode::from(EX_OSERR as u8);
+			return err(&argv[0], e, Some(EX_OSERR));
 		}
 	}
 
 	if ins.is_empty() && outs.is_empty() && argv.len() > optind {
-		eprintln!("Usage: {}", usage);
-		return ExitCode::from(EX_USAGE as u8);
+		return usage(&argv[0]);
 	}
 
 	/* use stdin if no inputs are specified */
@@ -153,8 +156,8 @@ fn main() -> ExitCode {
 		match File::open(file) {
 			Ok(f) => f,
 			Err(e) => {
-				eprintln!("{}: {}: {}", argv[0], file, e.strerror());
-				exit(EX_IOERR);
+				let _ = err(&(argv[0].clone() + ": " + file), e, None);
+				exit(EX_IOERR.into());
 			},
 		}
 	}).collect::<Vec<_>>();
@@ -180,8 +183,8 @@ fn main() -> ExitCode {
 		match options {
 			Ok(f) => return f,
 			Err(e) => {
-				eprintln!("{}: {}: {}", argv[0], file, e.strerror());
-				exit(EX_IOERR);
+				let _ = err(&(argv[0].clone() + ": " + file), e, None);
+				exit(EX_IOERR.into());
 			},
 		};
 	}).collect::<Vec<_>>();
@@ -205,21 +208,19 @@ fn main() -> ExitCode {
 	for file in inputs {
 		for byte in file.bytes().map(|b| {
 			b.unwrap_or_else(|e| {
-				eprintln!("{}: {}", argv[0], e.strerror());
-				exit(EX_IOERR);
+				let _ = err(&argv[0], e, None);
+				exit(EX_IOERR.into());
 			})
 		}) {
 			for out in &mut outputs {
 				if let Err(e) = out.write(&[byte]) {
-					eprintln!("{}: {}", argv[0], e.strerror());
-					return ExitCode::from(EX_IOERR as u8);
+					return err(&argv[0], e, Some(EX_IOERR));
 				}
 
 				if u {
 					/* immediately flush the output for -u */
 					if let Err(e) = out.flush() { 
-						eprintln!("{}: {}", argv[0], e.strerror());
-						return ExitCode::from(EX_IOERR as u8);
+						return err(&argv[0], e, Some(EX_IOERR));
 					}
 				}
 			}

src/npc.c

@@ -20,7 +20,7 @@
 #include <stdio.h> /* fprintf(3), fputs(3), getc(3), perror(3), putc(3), stdin,
                     * stdout, EOF */
 #include <sysexits.h> /* EX_IOERR, EX_OK, EX_OSERR, EX_USAGE */
-#include <unistd.h> /* pledge(2), getopt(3) */
+#include <unistd.h> /* NULL, getopt(3), pledge(2), unveil(2) */
 
 char *program_name = "npc";
 
@@ -44,7 +44,7 @@ int main(int argc, char *argv[]) {
 	char showtab = 0; /* prints tab characters in caret notation */
 
 #ifdef __OpenBSD__
-	if (pledge("stdio", NULL) == -1) {
+	if (pledge("stdio unveil", "") == -1 || unveil(NULL, NULL)) {
 		perror(argv[0] == NULL ? program_name : argv[0]);
 		return EX_OSERR;
 	}

src/rpn.rs

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
+ * Copyright (c) 2024–2025 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
@@ -46,21 +46,21 @@ use std::{
 	collections::VecDeque,
 	env::args,
 	fmt::{ self, Display, Formatter },
-	io::stdin,
+	io::{ Error, Write, stdin, stdout },
 	process::ExitCode,
 };
 
 use CalcType::*;
 
+extern crate strerror;
 extern crate sysexits;
 
-use sysexits::EX_DATAERR;
+use strerror::StrError;
+use sysexits::{ EX_DATAERR, EX_IOERR };
 
 #[cfg(target_os="openbsd")] use sysexits::EX_OSERR;
-#[cfg(target_os="openbsd")] extern crate strerror;
 #[cfg(target_os="openbsd")] extern crate openbsd;
-#[cfg(target_os="openbsd")] use strerror::StrError;
-#[cfg(target_os="openbsd")] use openbsd::{ Promises, pledge };
+#[cfg(target_os="openbsd")] use openbsd::{ Promises, pledge, unveil };
 
 #[derive(Clone, PartialEq, PartialOrd, Debug)]
 /* enum CalcType is a type containing operations used in the calculator */
@@ -120,12 +120,46 @@ impl Display for CalcType {
 #[derive(Debug, Clone)]
 struct EvaluationError {
 	message: String,
-	code: i32,
+	code: u8,
 }
 
-/* I’m no math nerd but I want the highest possible approximation of 0.9
- * repeating and it seems this can give it to me */
-const PRECISION_MOD: f64 = 0.9 + f64::EPSILON * 100.0;
+impl StrError for EvaluationError {
+	fn strerror(&self) -> String {
+		self.message.clone()
+	}
+}
+
+fn err<T: StrError>(argv0: &String, e: &T, code: Option<u8>) -> ExitCode {
+	eprintln!("{}: {}", argv0, e.strerror());
+	ExitCode::from(code.unwrap_or(1 /* unknown error */))
+}
+
+fn operate(
+	mut stack: VecDeque<f64>,
+	op: CalcType,
+) -> Result<VecDeque<f64>, EvaluationError> {
+	let vals = (stack.pop_back(), stack.pop_back());
+
+	if let (Some(x), Some(y)) = vals {
+		match op {
+			Add => stack.push_back(y + x),
+			Subtract => stack.push_back(y - x),
+			Multiply => stack.push_back(y * x),
+			Divide => stack.push_back(y / x),
+			Power => stack.push_back(y.powf(x)),
+			Floor => stack.push_back((y / x).floor()),
+			Modulo => stack.push_back(y % x),
+			_ => {},
+		};
+	} else {
+		return Err(EvaluationError {
+			message: format!("{}: unexpected operation", op),
+			code: EX_DATAERR,
+		})
+	}
+
+	Ok(stack)
+}
 
 fn eval(
 	input: &str,
@@ -145,6 +179,7 @@ fn eval(
 		.rev()
 		.map(|t| CalcType::from(t))
 		.collect();
+
 	let mut ops: VecDeque<CalcType> = VecDeque::new();
 
 	while let Some(n) = toks.pop_back() {
@@ -152,36 +187,15 @@ fn eval(
 			Val(v) => stack.push_back(v),
 			Invalid(i) => {
 				return Err(EvaluationError {
-					message: format!("{}: Invalid token", i),
+					message: format!("{}: invalid token", i),
 					code: EX_DATAERR,
 				})
 			},
 			op => {
 				ops.push_back(op.clone());
-				oper = true;
 
-				let vals = (
-					stack.pop_back(),
-					stack.pop_back(),
-				);
-
-				if let (Some(x), Some(y)) = vals {
-					match op {
-						Add => stack.push_back(y + x),
-						Subtract => stack.push_back(y - x),
-						Multiply => stack.push_back(y * x),
-						Divide => stack.push_back(y / x),
-						Power => stack.push_back(y.powf(x)),
-						Floor => stack.push_back((y / x).floor()),
-						Modulo => stack.push_back(y % x),
-						_ => {},
-					};
-				} else {
-					return Err(EvaluationError {
-						message: format!("{}: Unexpected operation", op),
-						code: EX_DATAERR,
-					})
-				}
+				oper = true; /* this is an operation */
+				return operate(stack, op).map(|s| (s, oper));
 			},
 		};
 	}
@@ -190,51 +204,46 @@ fn eval(
 }
 
 /* Round a float to the given precision level */
-fn round_precise(value: &f64, precision: usize) -> f64 {
-	let multiplier = 10_f64.powi(precision as i32);
+fn round_precise(value: &f64) -> f64 {
+	/* Set floating-point precision for correcting rounding errors based on
+	 * machine epsilon */
+	let precision = (-f64::EPSILON.log10()).floor() as i32;
+	let multiplier = 10_f64.powi(precision);
+
 	(value * multiplier).round() / multiplier
 }
 
+/* print the stack and let the caller know if evaluation should continue */
+fn unstack(stack: VecDeque<f64>, op: bool) -> Result<bool, Error> {
+	if let Some(val) = stack.iter().last() {
+		if !op { return Ok(true); }
+
+		let out = round_precise(val).to_string() + &'\n'.to_string();
+
+		return stdout().write_all(out.as_bytes()).map(|_| true);
+	} else {
+		return Ok(false);
+	}
+}
+
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<String>>();
 
 	#[cfg(target_os="openbsd")] {
-		let promises = Promises::new("stdio");
-		if let Err(e) = pledge(Some(promises), None) {
-			eprintln!("{}: {}", argv[0], e.strerror());
-			return ExitCode::from(EX_OSERR as u8);
+		let promises = Promises::new("stdio unveil");
+		if let Err(e) = pledge(Some(promises), Some(Promises::default())) {
+			return err(&argv[0], &e, Some(EX_OSERR));
+		}
+
+		if let Err(e) = unveil(None, None) {
+			return err(&argv[0], &e, Some(EX_OSERR));
 		}
 	}
 
 	let mut stack = VecDeque::new();
 	let mut buf = String::new();
-	/* Set floating-point precision for correcting rounding errors based on
-	 * machine epsilon */
-	let precision = (-f64::EPSILON.log10() * PRECISION_MOD).ceil() as usize;
-	
-	if argv.get(1).is_none() { /* read from stdin */
-		while let Ok(_) = stdin().read_line(&mut buf) {
-			match eval(&buf.trim(), stack) {
-				Ok(s) => {
-					buf.clear();
-					stack = s.0.clone();
 
-					let val = match stack.iter().last() {
-						Some(v) => v,
-						None => break,
-					};
-
-					if s.1 == false { continue; }
-
-					println!("{}", round_precise(val, precision).to_string());
-				},
-				Err(err) => {
-					eprintln!("{}: {}", argv[0], err.message);
-					return ExitCode::from(err.code as u8);
-				},
-			};
-		}
-	} else { /* read from argv */
+	if argv.get(1).is_some() { /* read expressions from argv */
 		/* join argv into an owned String joined by spaces minus argv[0] */
 		let input = argv
 			.iter()
@@ -245,20 +254,44 @@ fn main() -> ExitCode {
 
 		match eval(&input, stack) {
 			Ok(s) => {
-				stack = s.0.clone();
+				/* we can ignore the return value of unstack() because we are
+				 * not continually evaluating from stdin */
+				if let Err(e) = unstack(s.0.clone(), s.1.clone()) {
+					return err(&argv[0], &e, Some(EX_IOERR));
+				}
 
-				let val = match stack.iter().last() {
-					Some(v) => v,
-					None => return ExitCode::SUCCESS,
-				};
-
-				println!("{}", round_precise(val, precision).to_string())
+				return ExitCode::SUCCESS;
 			},
-			Err(err) => {
-				eprintln!("{}: {}", argv[0], err.message);
-				return ExitCode::from(err.code as u8);
+			Err(e) => {
+				return err(&argv[0], &e, Some(e.code));
 			},
 		};
 	}
+
+	/* else, read from stdin */
+	loop { /* take input until EOF */
+		if let Err(e) = stdin().read_line(&mut buf) {
+			return err(&argv[0], &e, Some(EX_IOERR));
+		}
+
+		match eval(&buf.trim(), stack) {
+			Ok(s) => {
+				buf.clear();
+				stack = s.0.clone(); /* out with the old, in with the new */
+
+				match unstack(s.0, s.1) {
+					Ok(b) if b => continue,
+					Ok(_) => break,
+					Err(e) => {
+						return err(&argv[0], &e, Some(EX_IOERR))
+					},
+				};
+			},
+			Err(e) => {
+				return err(&argv[0], &e, Some(e.code));
+			},
+		};
+	}
+
 	ExitCode::SUCCESS
 }

src/scrut.c

@@ -46,7 +46,7 @@ int main(int argc, char *argv[]) {
 	program_name = argv[0] == NULL ? program_name : argv[0];
 
 #ifdef __OpenBSD__
-	if (pledge("rpath stdio unveil", NULL) == -1) {
+	if (pledge("rpath stdio unveil", "") == -1) {
 		perror(program_name);
 		return EX_OSERR;
 	}
@@ -82,7 +82,7 @@ int main(int argc, char *argv[]) {
 		struct stat buf;
 
 #ifdef __OpenBSD__
-		if (unveil(*argv, "r") == -1) {
+		if (unveil(*argv, "rw") == -1) {
 			perror(program_name);
 			return EX_OSERR;
 		}

src/str.c

@@ -25,7 +25,7 @@
 #include <sysexits.h> /* EX_OSERR, EX_USAGE */
 
 #ifdef __OpenBSD__
-#	include <unistd.h> /* pledge(2) */
+#	include <unistd.h> /* pledge(2), unveil(2) */
 #endif
 
 char *program_name = "str";
@@ -62,7 +62,7 @@ int main(int argc, char *argv[]) {
 	program_name = argv[0] == NULL ? program_name : argv[0];
 
 #ifdef __OpenBSD__
-	if (pledge("stdio", NULL) == -1) {
+	if (pledge("stdio unveil", "") == -1 || unveil(NULL, NULL) == -1) {
 		perror(program_name);
 		return EX_OSERR;
 	}

src/strcmp.c

@@ -20,7 +20,7 @@
 #include <sysexits.h> /* EX_OK, EX_OSERR, EX_USAGE */
 
 #ifdef __OpenBSD__
-#	include <unistd.h> /* pledge(2) */
+#	include <unistd.h> /* pledge(2), unveil(2) */
 #endif
 
 char *program_name = "strcmp";
@@ -29,7 +29,7 @@ int main(int argc, char *argv[]) {
 	unsigned int i;
 
 #ifdef __OpenBSD__
-	if (pledge("stdio", NULL) == -1) {
+	if (pledge("stdio unveil", "") == -1 || unveil(NULL, NULL) == -1) {
 		perror(argv[0] == NULL ? program_name : argv[0]);
 
 		return EX_OSERR;

src/swab.rs

@@ -33,31 +33,29 @@ use sysexits::{ EX_IOERR, EX_OK, EX_OSERR, EX_USAGE };
 use strerror::StrError;
 
 #[cfg(target_os="openbsd")] extern crate openbsd;
-#[cfg(target_os="openbsd")] use openbsd::{ Promises, pledge };
+#[cfg(target_os="openbsd")] use openbsd::{ Promises, pledge, unveil };
 
-
-fn oserr(argv0: &str, e: Error) -> ExitCode {
+fn err(argv0: &String, e: Error, code: u8) -> ExitCode {
 	eprintln!("{}: {}", argv0, e.strerror());
-	ExitCode::from(EX_OSERR as u8)
+	ExitCode::from(code)
 }
 
-fn ioerr(argv0: &str, e: Error) -> ExitCode {
-	eprintln!("{}: {}", argv0, e.strerror());
-	ExitCode::from(EX_IOERR as u8)
-}
-
-fn usage(s: &str) -> ExitCode {
+fn usage(s: &String) -> ExitCode {
 	eprintln!("Usage: {} [-w word_size]", s);
-	ExitCode::from(EX_USAGE as u8)
+	ExitCode::from(EX_USAGE)
 }
 
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<String>>();
 	
 	#[cfg(target_os="openbsd")] {
-		let promises = Promises::new("stdio");
-		if let Err(e) = pledge(Some(promises), None) {
-			return oserr(&argv[0], e);
+		let promises = Promises::new("stdio unveil");
+		if let Err(e) = pledge(Some(promises), Some(Promises::default())) {
+			return err(&argv[0], e, EX_OSERR);
+		}
+
+		if let Err(e) = unveil(None, None) {
+			return err(&argv[0], e, EX_OSERR);
 		}
 	}
 
@@ -88,22 +86,22 @@ fn main() -> ExitCode {
 
 	loop {
 		match input.read(&mut buf) {
-			Ok(0) => break ExitCode::from(EX_OK as u8), // read nothing; bye
+			Ok(0) => break ExitCode::from(EX_OK), // read nothing; bye
 			Ok(v) if v == wordsize => { // read full block; swab
 				let (left, right) = buf.split_at(v/2);
 
 				if let Err(e) = output.write(&right)
 						.and_then(|_| output.write(&left)) {
-					break ioerr(&argv[0], e);
+					break err(&argv[0], e, EX_IOERR);
 				}
 
 			},
 			Ok(v) => { // partial read; partially write
 				if let Err(e) = output.write(&buf[..v]) {
-					break ioerr(&argv[0], e);
+					break err(&argv[0], e, EX_IOERR);
 				}
 			},
-			Err(e) => break oserr(&argv[0], e)
+			Err(e) => break err(&argv[0], e, EX_OSERR)
 		}
 	}
 }

src/true.c

@@ -13,6 +13,6 @@
 
 int main(void) {
 #ifdef __OpenBSD__
-	pledge(NULL, NULL);
+	(void)pledge("stdio", "");
 #endif
 }

tests/README

@@ -1,24 +1,13 @@
-The testing suite contains two trees: the Bonsai tree and the POSIX tree:
+Tests
+=====
 
-.
-├── README
-├── bonsai/
-│   ├── dj.mk
-│   ├── false.mk
-│   ├── fop.mk
-│   └── ...
-├── posix/
-└── tests.mk
+The Harakit testing suite verifies the functionality of Harakit utilities
+and checks for regressions and other issues relating to compliance to our
+standards of practice.
 
-The Bonsai tree tests the functionality of Harakit utilities for regressions and
-other issues relating to compliance to our standards of practice.
-
-The POSIX tests are currently a work-in-progress. Their status in this
-repository is uncertain.
-
-Both sets of tests also inherit the environment set by the top-level Makefile,
-which sets the BIN variable to the build/bin directory at the root of the
-project; therefore, each binary is located at $(BIN)/tool for idiomatic access.
+Tests inherit the environment set by the top-level Makefile, which sets the BIN
+variable to the build/bin directory at the root of the project; therefore, each
+binary is located at $(BIN)/tool for idiomatic access.
 
 Each test contains a set of PHONY targets which are prefixed with the name of
 the tool being tested and an underscore. The first target is tests, which
@@ -27,10 +16,10 @@ included in the top Makefile, so they can be called from the root of the
 repository. This also means that BIN can be set manually so that tests can be
 run using make(1) inside of the tests directory:
 
-	$ make -f tests.mk BIN=../build/bin dj_tests
+	$ make -f dj.mk BIN=../build/bin dj_tests
 
 --
-Copyright © 2024 Emma Tebibyte <emma@tebibyte.media>
+Copyright © 2024–2025 Emma Tebibyte <emma@tebibyte.media>
 
 This work is licensed under CC BY-SA 4.0. To view a copy of this license, visit
 <http://creativecommons.org/licenses/by-sa/4.0/>.

tests/fileis.mk

@@ -8,20 +8,20 @@
 
 .PRAGMA: command_comment
 
-.PHONY: scrut_tests
-scrut_tests: scrut_help scrut_options
+.PHONY: fileis_tests 
+fileis_tests: fileis_help fileis_options
 
-.PHONY: scrut_help
-scrut_help: $(BIN)/scrut
-	! $(BIN)/scrut -h
+.PHONY: fileis_help
+fileis_help: $(BIN)/fileis
+	! $(BIN)/fileis -h
 
-.PHONY: scrut_options
-# scrut tests file attributes, but files of a certain attribute aren't
+.PHONY: fileis_options
+# fileis tests file attributes, but files of a certain attribute aren't
 # guaranteed to be present on a system. This test checks all of the files in
 # harakit and, if test(1p) says a file matches a certain attribute, then checks
-# scrut.
+# fileis.
 # opts are space-delimited (for command splitting), sel is not
-scrut_options: $(BIN)/scrut
+fileis_options: $(BIN)/fileis
 	set -e; \
 	opts="b c d e f g k p r s u w x L S"; \
 	sel=; \
@@ -30,12 +30,12 @@ scrut_options: $(BIN)/scrut
 			for opt in $$opts; \
 				do if ! printf "%s\n" $$sel | grep $$opt >/dev/null; then \
 					if test -$$opt "$$f"; then \
-						if ! $(BIN)/scrut -$$opt "$$f"; \
-							then printf "[!!] scrut -%s failed on %s.\n" \
+						if ! $(BIN)/fileis -$$opt "$$f"; \
+							then printf "[!!] fileis -%s failed on %s.\n" \
 								$$opt "$$f"; \
 						fi; \
 						sel="$$sel$$opt"; \
-						printf "[OK] Tested scrut -%s using %s\n" \
+						printf "[OK] Tested fileis -%s using %s\n" \
 							$$opt "$$f"; \
 					fi; \
 				fi; \

tests/fop.mk

@@ -24,6 +24,7 @@ fop_fail: $(BIN)/fop
 	! printf 'test\n' | $(BIN)/fop 1 cat
 	! printf 'test\n' | $(BIN)/fop 'test' cat
 	! printf 'test\n' | $(BIN)/fop -d'test' cat
+	! $(BIN)/fop
 
 .PHONY: fop_functionality
 fop_functionality: $(BIN)/fop

tests/mm.mk

@@ -6,7 +6,7 @@
 # notice are preserved.  This file is offered as-is, without any warranty.
 
 .PHONY: mm_tests
-mm_tests: mm_args mm_help mm_stderr mm_remaining
+mm_tests: mm_args mm_help mm_stderr mm_remaining mm_remaining_options
 
 .PHONY: mm_none
 mm_none: $(BIN)/mm
@@ -32,3 +32,9 @@ mm_remaining: $(BIN)/mm
 	test "$$($(BIN)/mm -i README COPYING)" = "$$(cat README COPYING)"
 	$(BIN)/mm -i README -o /tmp/mm_test0 /tmp/mm_test1
 	diff /tmp/mm_test0 /tmp/mm_test1
+
+.PHONY: mm_remaining_options
+# check to make sure mm -i with trailing arguments interprets -o as one
+mm_remaining_options:
+	! $(BIN)/mm -i README COPYING -o - 2>&1 | cut -d: -f2 \
+		| xargs test " -o" =

tests/npc.mk

@@ -1,6 +1,6 @@
 #!/bin/sh
 # Copyright (c) 2024 DTB <trinity@trinity.moe>
-# Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
+# Copyright (c) 2024–2025 Emma Tebibyte <emma@tebibyte.media>
 # SPDX-License-Identifier: FSFAP
 #
 # Copying and distribution of this file, with or without modification, are
@@ -26,7 +26,7 @@ npc_args:
 
 .PHONY: npc_ascii
 # Test 0x00 to 0x7f in input; in other words, the full 7b ASCII range.
-npc_ascii: npc_ascii_controls npc_ascii_symbols npc_ascii_uppers # \
+npc_ascii: npc_ascii_controls npc_ascii_uppers # npc_ascii_symbols \
 #	npc_ascii_lowers
 
 .PHONY: npc_ascii_controls
@@ -63,14 +63,18 @@ npc_ascii_controls:
 		| tail -n 1 \
 		| xargs -I out test "^K^L^M^N^O^P^Q^R^S^T^U^V^W^X^Y^Z^[^\^]^^^_"
 
-.PHONY: npc_ascii_symbols
-# ASCII 0x1f to 0x3f (^_ and symbols)
-npc_ascii_symbols:
-	# shell quoting olympics
-	awk 'BEGIN{ for (i = 31; i < 64; ++i) printf("%c", i); print }' \
-		| $(BIN)/npc \
-		| sed -e s"/\'/\\\'/g" -e 's/"/\\"/g' \
-		| xargs -I out test "^_ !\"#$$%&'()*+,-./0123456789:;<=>?" = out
+# This test is broken on Linux and will need closer inspection along with GNU
+# xargs(1).
+# .PHONY: npc_ascii_symbols
+# # ASCII 0x1f to 0x3f (^_ and symbols)
+# npc_ascii_symbols:
+# 	# shell quoting olympics
+# 	c="$(awk 'BEGIN{ for (i = 31; i < 64; ++i) printf("%c", i); print }')"
+# 
+# 	printf '%s\n' "$c" | $(BIN)/npc \
+# 		| sed -e s"/\'/\\\'/g" -e 's/"/\\"/g' \
+# 		| tr -d '\n' \
+# 		| xargs -I out test "^_ !\"#$$%&\'()*+,-./0123456789:;<=>?" = out
 
 .PHONY: npc_ascii_uppers
 # ASCII 0x40 to 0x5f (uppercases)

tests/posix/bin/cat

@@ -1,22 +0,0 @@
-#!/bin/sh
-# Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
-# SPDX-License-Identifier: FSFAP
-#
-# Copying and distribution of this file, with or without modification, are
-# permitted in any medium without royalty provided the copyright notice and this
-# notice are preserved.  This file is offered as-is, without any warranty.
-
-# Strictly POSIX-compliant cat(1) implementation. See cat(1p)
-
-for arg in "$@"; do
-	case "$arg" in
-		-u) args="$(printf '%s	%s\n' "$args" "$arg")" ;;
-		*) args="$(printf -- '%s	-i	%s\n' "$args" "$arg")" ;;
-	esac
-done
-
-# See IEEE Std 1003.1-2017 3.282
-# https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_282
-IFS='	'
-
-mm $args

tests/posix/bin/false

@@ -1,12 +0,0 @@
-#!/bin/sh
-# Copyright (c) 2024 DTB <trinity@trinity.moe>
-# Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
-# SPDX-License-Identifier: FSFAP
-#
-# Copying and distribution of this file, with or without modification, are
-# permitted in any medium without royalty provided the copyright notice and this
-# notice are preserved.  This file is offered as-is, without any warranty.
-
-# Strictly POSIX-compliant false(1) implementation. See false(1p)
-
-false "$@"

tests/posix/bin/true

@@ -1,11 +0,0 @@
-#!/bin/sh
-# Copyright (c) 2024 DTB <trinity@trinity.moe>
-# Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
-# SPDX-License-Identifier: FSFAP
-#
-# Copying and distribution of this file, with or without modification, are
-# permitted in any medium without royalty provided the copyright notice and this
-# notice are preserved.  This file is offered as-is, without any warranty.
-
-# Strictly POSIX-compliant true(1) implementation. See true(1p)
-true "$@"

tests/posix/posix_env

@@ -1,5 +0,0 @@
-#!/bin/sh
-
-set -ex
-
-PATH="$PWD/bin:$PATH"

tests/rpn.mk

@@ -6,7 +6,7 @@
 # notice are preserved.  This file is offered as-is, without any warranty.
 
 .PHONY: rpn_tests
-rpn_tests: rpn_help rpn_add rpn_sub rpn_mul rpn_div rpn_mod rpn_flr
+rpn_tests: rpn_help rpn_add rpn_sub rpn_mul rpn_div rpn_mod rpn_flr rpn_stdin
 
 .PHONY: rpn_help
 rpn_help: $(BIN)/rpn
@@ -41,3 +41,8 @@ rpn_mod: $(BIN)/rpn
 rpn_flr: $(BIN)/rpn
 	test "$$($(BIN)/rpn 12 5 //)" -eq 2
 	test "$$($(BIN)/rpn 9 4 //)" -eq 2
+
+# done last because all operations have been tested
+.PHONY: rpn_stdin
+rpn_stdin: $(BIN)/rpn
+	test "$$(printf '1\n2\n+\n3\n-\n' | $(BIN)/rpn | tail -n1)" -eq 0

tests/tests.mk

@@ -1,15 +0,0 @@
-# Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
-# SPDX-License-Identifier: FSFAP
-#
-# Copying and distribution of this file, with or without modification, are
-# permitted in any medium without royalty provided the copyright notice and this 
-# notice are preserved.  This file is offered as-is, without any warranty.
-
-
-#TESTFILES != for file in tests/bonsai/*.mk tests/posix/*.mk; do printf '%s ' "$$file"; done;
-TESTFILES != for file in tests/bonsai/*.mk; do printf '%s ' "$$file"; done;
-
-TESTS != printf '%s\n' "$(TESTFILES)" | xargs -n1 basename \
-	| sed 's/\.mk/_tests/g'
-
-include $(TESTFILES)