date: handle the empty arguments

fuzz/fuzz_targets/fuzz_date.rs

@@ -3,12 +3,24 @@ use libfuzzer_sys::fuzz_target;
 
 use std::ffi::OsString;
 use uu_date::uumain;
+use uufuzz::generate_and_run_uumain;
 
 fuzz_target!(|data: &[u8]| {
     let delim: u8 = 0; // Null byte
-    let args = data
+    let args: Vec<OsString> = data
         .split(|b| *b == delim)
         .filter_map(|e| std::str::from_utf8(e).ok())
-        .map(OsString::from);
-    uumain(args);
+        .map(OsString::from)
+        .collect();
+    
+    // Ensure we have at least a program name
+    if args.is_empty() {
+        return;
+    }
+    
+    let date_main = |args: std::vec::IntoIter<OsString>| -> i32 {
+        uumain(args)
+    };
+    
+    let _ = generate_and_run_uumain(&args, date_main, None);
 });

tests/by-util/test_date.rs

@@ -17,6 +17,13 @@ fn test_invalid_arg() {
     new_ucmd!().arg("--definitely-invalid").fails_with_code(1);
 }
 
+#[test]
+fn test_empty_arguments() {
+    new_ucmd!().arg("").fails_with_code(1);
+    new_ucmd!().args(&["", ""]).fails_with_code(1);
+    new_ucmd!().args(&["", "", ""]).fails_with_code(1);
+}
+
 #[test]
 fn test_date_email() {
     for param in ["--rfc-email", "--rfc-e", "-R", "--rfc-2822", "--rfc-822"] {