(nuttx-apps) 02/02: examples/rust: Show command arguments in hello_rust_cargo

[acassis]

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acassis pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx-apps.git

commit 8d6c49536569b517a97bf3104edb83636e2b910e
Author: Shoji Tokunaga <t...@mac.com>
AuthorDate: Thu Jun 18 23:53:58 2026 +0900

    examples/rust: Show command arguments in hello_rust_cargo
    
    Print each argument passed from nsh with its index, and report when
    the example is running on the simulator target. This makes the Rust
    example demonstrate both C argv handling and target-specific output.
    
    Signed-off-by: Shoji Tokunaga <toku@mac.​com>
---
 examples/rust/hello/src/lib.rs | 34 +++++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 11 deletions(-)

diff --git a/examples/rust/hello/src/lib.rs b/examples/rust/hello/src/lib.rs
index dbe71ca0e..e9b0e0ade 100644
--- a/examples/rust/hello/src/lib.rs
+++ b/examples/rust/hello/src/lib.rs
@@ -1,7 +1,7 @@
 extern crate serde;
 extern crate serde_json;
 
-use core::ffi::{c_char, c_int};
+use core::ffi::{c_char, c_int, CStr};
 use serde::{Deserialize, Serialize};
 
 #[derive(Serialize, Deserialize)]
@@ -10,10 +10,29 @@ struct Person {
     age: u8,
 }
 
-// Function hello_rust_cargo without manglng
+fn print_args(argc: c_int, argv: *mut *mut c_char) {
+    if argv.is_null() {
+        return;
+    }
+
+    for i in 1..argc {
+        let arg = unsafe { *argv.add(i as usize) };
+        if arg.is_null() {
+            continue;
+        }
+
+        let arg = unsafe { CStr::from_ptr(arg) }.to_string_lossy();
+        println!("{}: {}", i, arg);
+    }
+}
+
+// Function hello_rust_cargo without mangling
 #[no_mangle]
-pub extern "C" fn hello_rust_cargo_main(_argc: c_int, _argv: *mut *mut c_char) 
-> c_int {
-    // Print hello world to stdout
+pub extern "C" fn hello_rust_cargo_main(argc: c_int, argv: *mut *mut c_char) 
-> c_int {
+    print_args(argc, argv);
+
+    #[cfg(feature = "sim")]
+    println!("On simulator");
 
     let john = Person {
         name: "John".to_string(),
@@ -50,12 +69,5 @@ pub extern "C" fn hello_rust_cargo_main(_argc: c_int, _argv: 
*mut *mut c_char) -
         .block_on(async {
             println!("Hello world from tokio!");
         });
-
-    #[cfg(not(feature = "sim"))]
-    loop {
-        // Do nothing
-    }
-
-    #[cfg(feature = "sim")]
     0
 }