use fill and SmallRng

Cargo.toml

@@ -4,4 +4,4 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-rand = "0.8.5"
+rand = { version = "0.8.5", features = ["small_rng", "std_rng"] }

maze.c

@@ -25,3 +25,4 @@ int main() {
         fwrite(buf, sizeof(char), BUF_SIZE, stdout);
     }
 }
+

src/main.rs

@@ -1,21 +1,19 @@
 use std::io::{self, BufWriter, Write};
 
-use rand::Rng;
+use rand::{rngs::SmallRng, Rng, SeedableRng};
 
 fn main() {
-    let mut rng = rand::thread_rng();
     let mut stdout = BufWriter::new(io::stdout().lock());
+    let mut rng = SmallRng::from_entropy();
+    let mut bits = [0u64; 8192];
     loop {
-        let bits: u64 = rng.gen();
-        for i in 0..64 {
-            let bit = (bits >> i) & 1;
-            // '/'
-            // 0101111
-            // '\\'
-            // 1011100
-            let c = if bit == 0 { '/' } else { '\\' };
-            // let _ = write!(stdout, "{c}");
-            let _ = stdout.write_all(&[c as u8]);
+        rng.fill(&mut bits[..]);
+        for bits in bits {
+            for i in 0..64 {
+                let bit = (bits >> i) & 1;
+                let c = if bit == 0 { b'/' } else { b'\\' };
+                let _ = stdout.write_all(&[c]);
+            }
         }
     }
 }