terminal: implement nl to crnl

kernel/libk/src/vfs/terminal.rs

@@ -111,12 +111,22 @@ impl<O: TerminalOutput> Terminal<O> {
     }
 
     pub fn putc_to_output(&self, byte: u8) -> Result<(), Error> {
+        let config = self.config.read().output;
+        if byte == b'\n' && config.contains(TerminalOutputOptions::NL_TO_CRNL) {
+            self.output.write(b'\r').ok();
+        }
         self.output.write(byte)
     }
 
     pub fn write_to_output(&self, buffer: &[u8]) -> Result<usize, Error> {
-        // TODO handle options
-        self.output.write_multiple(buffer)
+        let config = self.config.read().output;
+        for &byte in buffer {
+            if byte == b'\n' && config.contains(TerminalOutputOptions::NL_TO_CRNL) {
+                self.output.write(b'\r').ok();
+            }
+            self.output.write(byte)?;
+        }
+        Ok(buffer.len())
     }
 
     pub fn write_to_input(&self, mut byte: u8) {