September 2017 Update

Task/FizzBuzz/Rust/fizzbuzz-3.rust

@@ -1,16 +1,37 @@
-// rust 0.11
+ #![no_std]
+#![feature(asm, lang_items, libc, no_std, start)]
 
-fn main() {
-    for num in std::iter::range_inclusive(1i, 100) {
-        println!("{}", fizzbuzz(num))
+extern crate libc;
+
+const LEN: usize = 413;
+static OUT: [u8; LEN] = *b"\
+    1\n2\nFizz\n4\nBuzz\nFizz\n7\n8\nFizz\nBuzz\n11\nFizz\n13\n14\nFizzBuzz\n\
+    16\n17\nFizz\n19\nBuzz\nFizz\n22\n23\nFizz\nBuzz\n26\nFizz\n28\n29\nFizzBuzz\n\
+    31\n32\nFizz\n34\nBuzz\nFizz\n37\n38\nFizz\nBuzz\n41\nFizz\n43\n44\nFizzBuzz\n\
+    46\n47\nFizz\n49\nBuzz\nFizz\n52\n53\nFizz\nBuzz\n56\nFizz\n58\n59\nFizzBuzz\n\
+    61\n62\nFizz\n64\nBuzz\nFizz\n67\n68\nFizz\nBuzz\n71\nFizz\n73\n74\nFizzBuzz\n\
+    76\n77\nFizz\n79\nBuzz\nFizz\n82\n83\nFizz\nBuzz\n86\nFizz\n88\n89\nFizzBuzz\n\
+    91\n92\nFizz\n94\nBuzz\nFizz\n97\n98\nFizz\nBuzz\n";
+
+#[start]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    unsafe {
+        asm!(
+            "
+            mov $$1, %rax
+            mov $$1, %rdi
+            mov $0, %rsi
+            mov $1, %rdx
+            syscall
+            "
+            :
+            : "r" (&OUT[0]) "r" (LEN)
+            : "rax", "rdi", "rsi", "rdx"
+            :
+        );
     }
+    0
 }
 
-fn fizzbuzz(num: int) -> String {
-    match (num % 3, num % 5) {
-        (0, 0) => format!("FizzBuzz"),
-        (0, _) => format!("Fizz"),
-        (_, 0) => format!("Buzz"),
-        (_, _) => format!("{}", num),
-    }
-}
+#[lang = "eh_personality"] extern fn eh_personality() {}
+#[lang = "panic_fmt"] extern fn panic_fmt() {}