Add casr-lua to casr-libfuzzer

Author: PaDarochek

casr/src/bin/casr-libfuzzer.rs

@@ -161,6 +161,14 @@ fn main() -> Result<()> {
                 || argv[0].ends_with("jsfuzz"))
     {
         "casr-js"
+    } else if hint == "lua"
+        || hint == "auto"
+            && (argv[0].ends_with(".lua")
+                || argv[0] == "lua"
+                || argv[0] == "luajit"
+                || argv.len() > 1 && argv[1].ends_with(".lua"))
+    {
+        "casr-lua"
     } else {
         let sym_list = util::symbols_list(Path::new(argv[0]))?;
         if hint == "san"
@@ -203,7 +211,7 @@ fn main() -> Result<()> {
     // Get input file argument index.
     let at_index = if let Some(idx) = argv.iter().skip(1).position(|s| s.contains("@@")) {
         Some(idx + 1)
-    } else if is_libafl_based {
+    } else if is_libafl_based || tool.eq("casr-lua") {
         None
     } else {
         argv.push("@@");

casr/src/triage.rs

@@ -51,7 +51,7 @@ impl<'a> CrashInfo {
         } else {
             args.push(format!("{}.casrep", report_path.display()));
         }
-        if self.at_index.is_none() {
+        if self.at_index.is_none() || self.at_index == Some(0) {
             args.push("--stdin".to_string());
             args.push(self.path.to_str().unwrap().to_string());
         }