Implemented input and output baud rate setting for stty

ChrisDryden · ChrisDryden · commit a1c004442e62 · 2025-11-29T04:39:49.000Z
diff --git a/src/uu/stty/src/flags.rs b/src/uu/stty/src/flags.rs
@@ -27,6 +27,12 @@ use nix::sys::termios::{
     SpecialCharacterIndices as S,
 };
 
+pub enum BaudType {
+    Input,
+    Output,
+    Both,
+}
+
 pub enum AllFlags<'a> {
     #[cfg(any(
         target_os = "freebsd",
@@ -36,7 +42,7 @@ pub enum AllFlags<'a> {
         target_os = "netbsd",
         target_os = "openbsd"
     ))]
-    Baud(u32),
+    Baud(u32, BaudType),
     #[cfg(not(any(
         target_os = "freebsd",
         target_os = "dragonfly",
@@ -45,7 +51,7 @@ pub enum AllFlags<'a> {
         target_os = "netbsd",
         target_os = "openbsd"
     )))]
-    Baud(BaudRate),
+    Baud(BaudRate, BaudType),
     ControlFlags((&'a Flag<C>, bool)),
     InputFlags((&'a Flag<I>, bool)),
     LocalFlags((&'a Flag<L>, bool)),
diff --git a/src/uu/stty/src/stty.rs b/src/uu/stty/src/stty.rs
@@ -10,7 +10,7 @@
 // spell-checker:ignore isig icanon iexten echoe crterase echok echonl noflsh xcase tostop echoprt prterase echoctl ctlecho echoke crtkill flusho extproc
 // spell-checker:ignore lnext rprnt susp swtch vdiscard veof veol verase vintr vkill vlnext vquit vreprint vstart vstop vsusp vswtc vwerase werase
 // spell-checker:ignore sigquit sigtstp
-// spell-checker:ignore cbreak decctlq evenp litout oddp tcsadrain exta extb NCCS
+// spell-checker:ignore cbreak decctlq evenp litout oddp tcsadrain exta extb NCCS cfsetispeed
 
 mod flags;
 
@@ -20,7 +20,7 @@ use clap::{Arg, ArgAction, ArgMatches, Command};
 use nix::libc::{O_NONBLOCK, TIOCGWINSZ, TIOCSWINSZ, c_ushort};
 use nix::sys::termios::{
     ControlFlags, InputFlags, LocalFlags, OutputFlags, SetArg, SpecialCharacterIndices as S,
-    Termios, cfgetospeed, cfsetospeed, tcgetattr, tcsetattr,
+    Termios, cfgetospeed, cfsetispeed, cfsetospeed, tcgetattr, tcsetattr,
 };
 use nix::{ioctl_read_bad, ioctl_write_ptr_bad};
 use std::cmp::Ordering;
@@ -273,19 +273,24 @@ fn stty(opts: &Options) -> UResult<()> {
         let mut args_iter = args.iter();
         while let Some(&arg) = args_iter.next() {
             match arg {
-                "ispeed" | "ospeed" => match args_iter.next() {
+                "ispeed" => match args_iter.next() {
                     Some(speed) => {
-                        if let Some(baud_flag) = string_to_baud(speed) {
+                        if let Some(baud_flag) = string_to_baud(speed, flags::BaudType::Input) {
                             valid_args.push(ArgOptions::Flags(baud_flag));
                         } else {
-                            return Err(USimpleError::new(
-                                1,
-                                translate!(
-                                    "stty-error-invalid-speed",
-                                    "arg" => *arg,
-                                    "speed" => *speed,
-                                ),
-                            ));
+                            return invalid_speed(arg, speed);
+                        }
+                    }
+                    None => {
+                        return missing_arg(arg);
+                    }
+                },
+                "ospeed" => match args_iter.next() {
+                    Some(speed) => {
+                        if let Some(baud_flag) = string_to_baud(speed, flags::BaudType::Output) {
+                            valid_args.push(ArgOptions::Flags(baud_flag));
+                        } else {
+                            return invalid_speed(arg, speed);
                         }
                     }
                     None => {
@@ -382,12 +387,12 @@ fn stty(opts: &Options) -> UResult<()> {
                             return missing_arg(arg);
                         }
                     // baud rate
-                    } else if let Some(baud_flag) = string_to_baud(arg) {
+                    } else if let Some(baud_flag) = string_to_baud(arg, flags::BaudType::Both) {
                         valid_args.push(ArgOptions::Flags(baud_flag));
                     // non control char flag
                     } else if let Some(flag) = string_to_flag(arg) {
                         let remove_group = match flag {
-                            AllFlags::Baud(_) => false,
+                            AllFlags::Baud(_, _) => false,
                             AllFlags::ControlFlags((flag, remove)) => {
                                 check_flag_group(flag, remove)
                             }
@@ -416,7 +421,7 @@ fn stty(opts: &Options) -> UResult<()> {
         for arg in &valid_args {
             match arg {
                 ArgOptions::Mapping(mapping) => apply_char_mapping(&mut termios, mapping),
-                ArgOptions::Flags(flag) => apply_setting(&mut termios, flag),
+                ArgOptions::Flags(flag) => apply_setting(&mut termios, flag)?,
                 ArgOptions::Special(setting) => {
                     apply_special_setting(&mut termios, setting, opts.file.as_raw_fd())?;
                 }
@@ -468,6 +473,17 @@ fn invalid_integer_arg<T>(arg: &str) -> Result<T, Box<dyn UError>> {
     ))
 }
 
+fn invalid_speed<T>(arg: &str, speed: &str) -> Result<T, Box<dyn UError>> {
+    Err(UUsageError::new(
+        1,
+        translate!(
+            "stty-error-invalid-speed",
+            "arg" => arg,
+            "speed" => speed,
+        ),
+    ))
+}
+
 /// GNU uses different error messages if values overflow or underflow a u8,
 /// this function returns the appropriate error message in the case of overflow or underflow, or u8 on success
 fn parse_u8_or_err(arg: &str) -> Result<u8, String> {
@@ -657,7 +673,7 @@ fn parse_baud_with_rounding(normalized: &str) -> Option<u32> {
     Some(value)
 }
 
-fn string_to_baud(arg: &str) -> Option<AllFlags<'_>> {
+fn string_to_baud(arg: &str, baud_type: flags::BaudType) -> Option<AllFlags<'_>> {
     // Reject invalid formats
     if arg != arg.trim_end()
         || arg.trim().starts_with('-')
@@ -682,7 +698,7 @@ fn string_to_baud(arg: &str) -> Option<AllFlags<'_>> {
         target_os = "netbsd",
         target_os = "openbsd"
     ))]
-    return Some(AllFlags::Baud(value));
+    return Some(AllFlags::Baud(value, baud_type));
 
     #[cfg(not(any(
         target_os = "freebsd",
@@ -695,7 +711,7 @@ fn string_to_baud(arg: &str) -> Option<AllFlags<'_>> {
     {
         for (text, baud_rate) in BAUD_RATES {
             if text.parse::<u32>().ok() == Some(value) {
-                return Some(AllFlags::Baud(*baud_rate));
+                return Some(AllFlags::Baud(*baud_rate, baud_type));
             }
         }
         None
@@ -853,9 +869,9 @@ fn print_flags<T: TermiosFlag>(termios: &Termios, opts: &Options, flags: &[Flag<
 }
 
 /// Apply a single setting
-fn apply_setting(termios: &mut Termios, setting: &AllFlags) {
+fn apply_setting(termios: &mut Termios, setting: &AllFlags) -> nix::Result<()> {
     match setting {
-        AllFlags::Baud(_) => apply_baud_rate_flag(termios, setting),
+        AllFlags::Baud(_, _) => apply_baud_rate_flag(termios, setting)?,
         AllFlags::ControlFlags((setting, disable)) => {
             setting.flag.apply(termios, !disable);
         }
@@ -869,9 +885,10 @@ fn apply_setting(termios: &mut Termios, setting: &AllFlags) {
             setting.flag.apply(termios, !disable);
         }
     }
+    Ok(())
 }
 
-fn apply_baud_rate_flag(termios: &mut Termios, input: &AllFlags) {
+fn apply_baud_rate_flag(termios: &mut Termios, input: &AllFlags) -> nix::Result<()> {
     // BSDs use a u32 for the baud rate, so any decimal number applies.
     #[cfg(any(
         target_os = "freebsd",
@@ -881,8 +898,15 @@ fn apply_baud_rate_flag(termios: &mut Termios, input: &AllFlags) {
         target_os = "netbsd",
         target_os = "openbsd"
     ))]
-    if let AllFlags::Baud(n) = input {
-        cfsetospeed(termios, *n).expect("Failed to set baud rate");
+    if let AllFlags::Baud(n, baud_type) = input {
+        match baud_type {
+            flags::BaudType::Input => cfsetispeed(termios, *n)?,
+            flags::BaudType::Output => cfsetospeed(termios, *n)?,
+            flags::BaudType::Both => {
+                cfsetispeed(termios, *n)?;
+                cfsetospeed(termios, *n)?;
+            }
+        }
     }
 
     // Other platforms use an enum.
@@ -894,9 +918,17 @@ fn apply_baud_rate_flag(termios: &mut Termios, input: &AllFlags) {
         target_os = "netbsd",
         target_os = "openbsd"
     )))]
-    if let AllFlags::Baud(br) = input {
-        cfsetospeed(termios, *br).expect("Failed to set baud rate");
+    if let AllFlags::Baud(br, baud_type) = input {
+        match baud_type {
+            flags::BaudType::Input => cfsetispeed(termios, *br)?,
+            flags::BaudType::Output => cfsetospeed(termios, *br)?,
+            flags::BaudType::Both => {
+                cfsetispeed(termios, *br)?;
+                cfsetospeed(termios, *br)?;
+            }
+        }
     }
+    Ok(())
 }
 
 fn apply_char_mapping(termios: &mut Termios, mapping: &(S, u8)) {
diff --git a/tests/by-util/test_stty.rs b/tests/by-util/test_stty.rs
@@ -526,3 +526,67 @@ fn test_saved_state_with_control_chars() {
         .stderr_is(exp_result.stderr_str())
         .code_is(exp_result.code());
 }
+
+#[test]
+#[cfg(unix)]
+fn test_ispeed_ospeed_valid_speeds() {
+    let (path, _controller, _replica) = pty_path();
+    let (_at, ts) = at_and_ts!();
+
+    // Test various valid baud rates for both ispeed and ospeed
+    let test_cases = [
+        ("ispeed", "50"),
+        ("ispeed", "9600"),
+        ("ispeed", "19200"),
+        ("ospeed", "1200"),
+        ("ospeed", "9600"),
+        ("ospeed", "38400"),
+    ];
+
+    for (arg, speed) in test_cases {
+        let result = ts.ucmd().args(&["--file", &path, arg, speed]).run();
+        let exp_result = unwrap_or_return!(expected_result(&ts, &["--file", &path, arg, speed]));
+        let normalized_stderr = normalize_stderr(result.stderr_str());
+
+        result
+            .stdout_is(exp_result.stdout_str())
+            .code_is(exp_result.code());
+        assert_eq!(normalized_stderr, exp_result.stderr_str());
+    }
+}
+
+#[test]
+#[cfg(all(
+    unix,
+    not(any(
+        target_os = "freebsd",
+        target_os = "dragonfly",
+        target_os = "ios",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd"
+    ))
+))]
+fn test_ispeed_ospeed_invalid_speeds() {
+    let (path, _controller, _replica) = pty_path();
+    let (_at, ts) = at_and_ts!();
+
+    // Test invalid speed values (non-standard baud rates)
+    let test_cases = [
+        ("ispeed", "12345"),
+        ("ospeed", "99999"),
+        ("ispeed", "abc"),
+        ("ospeed", "xyz"),
+    ];
+
+    for (arg, speed) in test_cases {
+        let result = ts.ucmd().args(&["--file", &path, arg, speed]).run();
+        let exp_result = unwrap_or_return!(expected_result(&ts, &["--file", &path, arg, speed]));
+        let normalized_stderr = normalize_stderr(result.stderr_str());
+
+        result
+            .stdout_is(exp_result.stdout_str())
+            .code_is(exp_result.code());
+        assert_eq!(normalized_stderr, exp_result.stderr_str());
+    }
+}
