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/cat/src/main.rs b/bins/cat/src/main.rs
index 6683c83..f530525 100644
--- a/bins/cat/src/main.rs
+++ b/bins/cat/src/main.rs
@@ -37,8 +37,9 @@ fn dump_file(exports: &rsapi::Exports, path: &str) -> i32 {
 
 #[unsafe(no_mangle)]
 pub extern "C" fn efi_main(exports: &'static rsapi::Exports, argc: usize, argv: *const rsapi::Arg) -> i32 {
-    let args = unsafe { core::slice::from_raw_parts(argv, argc) };
-    if argc > 0 {
+    // C-style argv: argv[0] is the program name, user args start at 1.
+    let args = unsafe { core::slice::from_raw_parts(argv.add(1), argc.saturating_sub(1)) };
+    if !args.is_empty() {
         // Print each path argument
         let mut code = 0;
         for a in args.iter() {