From 326c8f77d13683dd3e3aae5cb2cdd75993857efe Mon Sep 17 00:00:00 2001
From: emma <emma@tebibyte.media>
Date: Sat, 10 Aug 2024 15:34:14 -0600
Subject: [PATCH] rpn(1): adds support for pledge(2)

---
 src/rpn.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/rpn.rs b/src/rpn.rs
index 784e323..e4f725d 100644
--- a/src/rpn.rs
+++ b/src/rpn.rs
@@ -56,6 +56,12 @@ extern crate sysexits;
 
 use sysexits::EX_DATAERR;
 
+#[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 };
+
 #[derive(Clone, PartialEq, PartialOrd, Debug)]
 /* enum CalcType is a type containing operations used in the calculator */
 enum CalcType {
@@ -191,6 +197,15 @@ fn round_precise(value: &f64, precision: usize) -> f64 {
 
 fn main() -> ExitCode {
 	let argv = args().collect::<Vec<String>>();
+
+	if 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 mut stack = VecDeque::new();
 	let mut buf = String::new();
 	/* Set floating-point precision for correcting rounding errors based on