Add info on how to use the fuzz_target macro

Author: nagisa

README.md

@@ -18,15 +18,17 @@ fuzzer-sys = { path = "../libfuzzer-sys" } # or something
 
 $ cat src/main.rs
 #![no_main]
+#[macro_use]
 extern crate fuzzer_sys;
 
-#[export_name="rust_fuzzer_test_input"]
-pub extern fn go(data: &[u8]) {
-    // code to be fuzzed goes here
-}
+fuzz_target!(|data| {
+    // code to fuzz goes here
+});
 
 $ cargo rustc -- -C passes='sancov' -C llvm-args='-sanitizer-coverage-level=3' -Z sanitizer=address -Cpanic=abort
 $ ./target/debug/fuzzed # runs fuzzing
 ```
 
-Nice wrappers incoming soon
+For a nice wrapper see [cargo-fuzz].
+
+[cargo-fuzz]: https://github.com/rust-fuzz/cargo-fuzz

src/lib.rs

@@ -16,7 +16,7 @@ pub fn test_input_wrap(data: *const u8, size: usize) -> i32 {
 }
 
 #[macro_export]
-macro_rules! fuzzer_target {
+macro_rules! fuzz_target {
     (|$bytes:ident| $body:block) => {
         #[no_mangle]
         pub extern fn rust_fuzzer_test_input($bytes: &[u8]) {