nice -n huge_num true

src/uu/nice/src/nice.rs

@@ -9,6 +9,7 @@ use clap::{Arg, ArgAction, Command};
 use libc::PRIO_PROCESS;
 use std::ffi::OsString;
 use std::io::{Error, ErrorKind, Write};
+use std::num::IntErrorKind;
 use std::os::unix::process::CommandExt;
 use std::process;
 
@@ -115,6 +116,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
             format!("getpriority: {}", Error::last_os_error()),
         ));
     }
+    let nice_bound = 50;
 
     let adjustment = match matches.get_one::<String>(options::ADJUSTMENT) {
         Some(nstr) => {
@@ -126,12 +128,16 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
             }
             match nstr.parse::<i32>() {
                 Ok(num) => num,
-                Err(e) => {
-                    return Err(USimpleError::new(
-                        125,
-                        translate!("nice-error-invalid-number", "value" => nstr.clone(), "error" => e),
-                    ));
-                }
+                Err(e) => match e.kind() {
+                    IntErrorKind::PosOverflow => nice_bound,
+                    IntErrorKind::NegOverflow => -nice_bound,
+                    _ => {
+                        return Err(USimpleError::new(
+                            125,
+                            translate!("nice-error-invalid-number", "value" => nstr.clone(), "error" => e),
+                        ));
+                    }
+                },
             }
         }
         None => {

tests/by-util/test_nice.rs

@@ -90,3 +90,32 @@ fn test_trailing_empty_adjustment() {
         "error: The argument '--adjustment <adjustment>' requires a value but none was supplied",
     );
 }
+
+#[test]
+fn test_nice_huge() {
+    new_ucmd!()
+        .args(&[
+            "-n",
+            "99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999",
+            "true",
+        ])
+        .succeeds()
+        .no_stdout();
+}
+
+#[test]
+fn test_nice_huge_negative() {
+    new_ucmd!().args(&["-n", "-9999999999", "true"]).succeeds(); // permission denied
+}
+
+#[test]
+fn test_sign_middle() {
+    new_ucmd!()
+        .args(&["-n", "-2+4", "true"])
+        .fails_with_code(125)
+        .no_stdout()
+        .stderr_contains("invalid");
+}
+//uu: "-2+4" is not a valid number: invalid digit found in string
+//gnu: invalid adjustment `-2+4'
+//Both message is fine