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//! cat — print files or stdin via the exports table.
//!
//! Args: [path ...] — each path is printed as raw text.
//! No args = read from get_line (stdin) until EOF.
#![no_std]
#![no_main]
#[panic_handler]
fn panic(_info: &core::panic::PanicInfo) -> ! {
loop { core::hint::spin_loop(); }
}
fn put(exports: &rsapi::Exports, buf: &[u8]) {
(exports.put_line)(rsapi::Line { ptr: buf.as_ptr(), len: buf.len() });
}
/// Read one file and put_line each chunk.
fn dump_file(exports: &rsapi::Exports, path: &str) -> i32 {
let h = (exports.fs_resolve)(rsapi::Line { ptr: path.as_ptr(), len: path.len() });
if h < 0 {
return -1;
}
let mut buf = [0u8; 512];
let mut pos: u64 = 0;
loop {
let n = (exports.fs_read)(h, buf.as_mut_ptr(), pos, 512);
if n <= 0 { break; }
if !(exports.put_line)(rsapi::Line { ptr: buf.as_ptr(), len: n as usize }) {
break; // pipeline says stop
}
pos += n as u64;
}
(exports.fs_close)(h);
0
}
#[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 {
// Print each path argument
let mut code = 0;
for a in args.iter() {
let path = core::str::from_utf8(unsafe {
core::slice::from_raw_parts(a.ptr, a.len)
}).unwrap_or("");
if dump_file(exports, path) != 0 {
code = 1;
}
}
code
} else {
// No args: read from stdin (get_line) until EOF/Abort
loop {
let mut line = rsapi::Line { ptr: core::ptr::null(), len: 0 };
match (exports.get_line)(&mut line) {
rsapi::StreamResult::Line => {
put(exports, unsafe {
core::slice::from_raw_parts(line.ptr, line.len)
});
}
rsapi::StreamResult::Eof | rsapi::StreamResult::Abort => break,
}
}
0
}
}
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