initial commit

src/instructions/_unix_random.rs

@@ -0,0 +1,14 @@
+use std::fs::File;
+use std::io::Read;
+use crate::RunError;
+
+#[cfg(target_family = "unix")]
+pub fn _unix_random(memory: &mut Vec<u16>) {
+    let mut rng = File::open("/dev/urandom").unwrap();
+
+    let mut buffer = [0u8; 1];
+    rng.read_exact(&mut buffer).unwrap();
+
+    let data = &memory.pop().expect(&format!("{}", RunError::MemoryEmpty));
+    memory.push((buffer[0] as u16) % (*data - 1));
+}

src/instructions/args.rs

@@ -1,7 +1,7 @@
 use crate::{errors::RunError, stack::Stack};
 
 pub fn args(memory: &mut Vec<u16>, origin_stack: &mut Option<&mut Stack>, data: &u16) {
-    let origin_memory = &mut origin_stack.as_mut().expect("msg").memory;
+    let origin_memory = &mut origin_stack.as_mut().expect(&format!("{}", RunError::RequestArgsInMainModule)).memory;
 
     if *origin_memory == *memory {
         eprintln!("{}", RunError::RequestArgsInMainModule);

src/instructions/dump.rs

@@ -1,4 +1,9 @@
 pub fn dump(memory: &mut Vec<u16>) {
+    if memory.is_empty() {
+        println!("Stack is empty.");
+        return;
+    }
+
     for (i, entry) in memory.iter().enumerate() {
         println!("{0}: {1}", i, entry);
     }

src/instructions/jnz.rs

@@ -6,7 +6,7 @@ pub fn jnz(memory: &mut Vec<u16>, labels: &mut [Option<i16>; 256], program_count
         std::process::exit(2);
     }
 
-    if memory.pop() != Some(0) {
+    if memory.last() != Some(&0) {
         *program_counter = (labels[*data as usize].unwrap() - 1) as u16;
     }
 }

src/instructions/jz.rs

@@ -6,7 +6,7 @@ pub fn jz(memory: &mut Vec<u16>, labels: &mut [Option<i16>; 256], program_counte
         std::process::exit(2);
     }
 
-    if memory.pop() == Some(0) {
+    if memory.last() == Some(&0) {
         *program_counter = (labels[*data as usize].unwrap() - 1) as u16;
     }
 }

src/instructions/maxsize.rs

@@ -0,0 +1,3 @@
+pub fn maxsize(memory: &mut Vec<u16>) {
+    memory.push(65535);
+}

src/instructions/mod.rs

@@ -19,4 +19,7 @@ pub mod exec;
 pub mod args;
 pub mod expr;
 pub mod size;
-pub mod exit;
+pub mod exit;
+pub mod maxsize;
+#[cfg(target_family = "unix")]
+pub mod _unix_random;