e

E

src/system/kernel/serial.rs

@@ -24,6 +24,19 @@ pub fn _print(args: core::fmt::Arguments) {
 	})
 
 }
+pub fn serial_reply(chr: char) -> char {
+	use core::fmt::Write;
+	use x86_64::instructions::interrupts;
+
+	let mut chr_return: char = 'X';
+
+	interrupts::without_interrupts(|| {
+		SERIAL1.lock().send(chr as u8);
+		chr_return = SERIAL1.lock().receive() as char ;
+	});
+
+	chr_return
+}
 
 #[macro_export]
 macro_rules! serial_print {

src/system/std/io.rs

@@ -8,6 +8,7 @@ use alloc::vec::Vec;
 
 pub use crate::{print, println, serial_print, serial_println};
 pub use crate::kernel::render::Color;
+use crate::kernel::serial::serial_reply;
 
 use lazy_static::lazy_static;
 use spin::Mutex;
@@ -30,6 +31,14 @@ impl Stdin {
     }
 }
 
+pub struct Serial {}
+
+impl Serial {
+    pub fn reply_char(c: char) -> char {
+        serial_reply(c)
+    }
+}
+
 pub struct Screen {}
 impl Screen {
     pub fn terminal_mode() {

src/user/bin/calc/calc.rs

@@ -126,11 +126,7 @@ impl Interpreter {
             },
             Operator::Exp => {
                 return Ok(Value::Number({
-                	let mut val = 1.0;
-                	for _ in 0..(right as i64) {
-                		val *= left
-                	};
-                	val
+                	super::functions::exp(left, right)
                 }))
             }
         }

src/user/bin/calc/functions.rs

@@ -2,6 +2,8 @@ use alloc::format;
 use alloc::string::String;
 use crate::println;
 
+const PI: f64 = 3.14159265358979323846264338327950288419716939937510;
+
 pub fn run_func(func: String, x: f64) -> Result<f64, String> {
     match func.as_str() {
         "sqrt" => sqrt(x),
@@ -36,14 +38,51 @@ fn factorial(x: f64) -> Result<f64, String> {
     Ok((1..=x).fold(1, |a, b| a * b) as f64)
 }
 
-fn sin(x: f64) -> Result<f64, String> {
-    Ok(libm::sin(x))
+fn cos(mut x: f64) -> Result<f64, String> {
+    while x > PI {
+        x -= PI;
+    }
+    
+    let res = 1.0 - trig_term(x, 2) + trig_term(x, 4) - trig_term(x, 6) + trig_term(x, 8) - trig_term(x, 10);
+    if res >= -1.0 && res <= 1.0 {
+        Ok(res)
+    } else {
+        panic!("something is very wrong with the cos function : {}", res);
+    }
 }
 
-fn cos(x: f64) -> Result<f64, String> {
-    Ok(libm::cos(x))
+fn sin(mut x: f64) -> Result<f64, String> {
+    while x > PI {
+        x -= PI;
+    }
+
+    
+    let res = x - trig_term(x, 3) + trig_term(x, 5) - trig_term(x, 7) + trig_term(x, 9) - trig_term(x, 11);
+    if res >= -1.0 && res <= 1.0 {
+        Ok(res) 
+    } else {
+        panic!("something is very wrong with the sin function: {}", res);
+    }
 }
 
 fn tan(x: f64) -> Result<f64, String> {
     Ok(libm::tan(x))
+}
+
+pub fn exp(x: f64, y: f64) -> f64 {
+    let mut res = 1.0;
+    for _ in 0..(y as usize) {
+        res *= x
+    }
+    res
+}
+
+fn trig_term(x: f64, y: usize) -> f64 {
+    let mut ex = 1.0;
+    for _ in 0..y {
+        ex *= x;
+    }
+    let fact = (1..=y).fold(1, |a, b| a*b);
+
+    ex as f64 / fact as f64
 }

src/user/bin/rickroll.rs

@@ -43,7 +43,7 @@ const RICKROLL2: &str = "
  1a###w#*mObo*oatXkW*oo#*###p       `--'  `---'  `----'      `-----' |  |-'
                                                                      `--'";
 
-use crate::{println};
+use crate::{println, serial_println};
 use alloc::{string::String, boxed::Box, vec::Vec};
 
 

src/user/bin/shell.rs

@@ -7,7 +7,7 @@ use alloc::{boxed::Box, string::{String, ToString}, vec, vec::Vec};
 use vga::writers::{GraphicsWriter, PrimitiveDrawing};
 
 use crate::{print, printerr, println, std, std::application::{Application, Error}, user::bin::*};
-use crate::std::io::{Color, write, Screen, Stdin};
+use crate::std::io::{Color, write, Screen, Stdin, Serial};
 use crate::std::random::Random;
 use crate::user::bin::gigachad_detector::GigachadDetector;
 use crate::user::bin::grapher::Grapher;
@@ -122,6 +122,10 @@ async fn exec() -> Result<(), Error> {
             let mut game = snake::Game::new();
             game.run(args).await?;
         }
+        "serial" => {
+            let c = Serial::reply_char('e');
+            println!("{}", c);
+        }
         "gameoflife" => {
             let mut game = gameoflife::GameOfLife::new();
             game.run(Vec::new()).await?;

src/user/lib/coords.rs

@@ -62,7 +62,7 @@ impl Position {
     }
 
 
-    pub fn rotated_around(&self, angle: Direction, p: Position) -> Position { // rotates by an angle around a point
+    pub fn rotated_aroundte(&self, angle: Direction, p: Position) -> Position { // rotates by an angle around a point
 
         // gets coords relative to point to rotate around
         let mut p_offset = self.get_offset(&p);