bins: read user args from argv[1..]; fix date year digit

exec::spawn passes C-style argv with argv[0] = the command name, but
ls, cat, mkdir, touch and rm treated argv[0] as their first user
argument.  Every path they were given resolved to the literal command
name ("ls", "mkdir", ...), so they failed silently: `mkdir .../sub`
never created the directory, `cat` printed nothing.

date formatted its last year digit as `y as u8 % 10`, which truncates
before the modulo (2026 -> 234 -> '4'), printing "2024".

Only visible now that the system image actually stages /bin — before,
/bin was empty and every command fell back to a built-in.

1 files changed, 3 insertions, 2 deletions

diff --git a/bins/ls/src/main.rs b/bins/ls/src/main.rs
index 956bf18..b4acc41 100644
--- a/bins/ls/src/main.rs
+++ b/bins/ls/src/main.rs
@@ -16,8 +16,9 @@ fn put(exports: &rsapi::Exports, buf: &[u8]) {
 
 #[unsafe(no_mangle)]
 pub extern "C" fn efi_main(exports: &'static rsapi::Exports, argc: usize, argv: *const rsapi::Arg) -> i32 {
-    let path_str = if argc > 0 {
-        let a = unsafe { &*argv };
+    // C-style argv: argv[0] is the program name, user args start at 1.
+    let path_str = if argc > 1 {
+        let a = unsafe { &*argv.add(1) };
         unsafe { core::str::from_utf8_unchecked(core::slice::from_raw_parts(a.ptr, a.len)) }
     } else {
         "/"