syscalls.rs panics on sparc with rustix 1.0.8

[Terryiscool160]

i'm building a project on sparc that depends on rustix 1.0.8 via the use of crossterm, and im running into an immediate panic upon program execution.

thread 'main' panicked at /rustix-1.0.8/src/backend/libc/termios/syscalls.rs:95:31:
range end index 19 out of range for slice of length 17
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::slice::index::slice_end_index_len_fail::do_panic::runtime
   3: core::slice::index::slice_end_index_len_fail
   4: core::ops::function::FnOnce::call_once
   5: std::sync::poison::once::Once::call_once::{{closure}}
   6: std::sys::sync::once::futex::Once::call
   7: pumpkin::main::{{closure}}
   8: pumpkin::main

rustix/src/backend/libc/termios/syscalls.rs

Line 95 in 5245b81

result.special_codes.0[..nccs].copy_from_slice(&termios2.c_cc);

[Terryiscool160]

after some work ive managed to fix the panic by falling back to only copying the overlapping range rather than expecting a fixed value - this does not seem to impact crossterm/rustyline-async so it works for my needs, but i do not understand enough about rustix to think this is a good fix

im unsure why there is a mismatch on my system causing this issue but hopefully this is of some help in diagnosis:

diff --git a/src/backend/libc/termios/syscalls.rs b/src/backend/libc/termios/syscalls.rs
index dbe4a6e0..e7fcc463 100644
--- a/src/backend/libc/termios/syscalls.rs
+++ b/src/backend/libc/termios/syscalls.rs
@@ -17,6 +17,7 @@ use crate::ffi::CStr;
     not(any(target_os = "fuchsia", target_os = "wasi"))
 ))]
 use core::mem::MaybeUninit;
+use core::cmp::min;
 #[cfg(not(target_os = "wasi"))]
 use {crate::io, crate::pid::Pid};
 #[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
@@ -91,8 +92,8 @@ pub(crate) fn tcgetattr(fd: BorrowedFd<'_>) -> io::Result<Termios> {
 
         // Copy in the control codes, since libc's `c_cc` array may have a
         // different length from the ioctl's.
-        let nccs = termios2.c_cc.len();
-        result.special_codes.0[..nccs].copy_from_slice(&termios2.c_cc);
+        let nccs = min(termios2.c_cc.len(), result.special_codes.0.len());
+        result.special_codes.0[..nccs].copy_from_slice(&termios2.c_cc[..nccs]);
 
         Ok(result)
     }
@@ -238,11 +239,9 @@ pub(crate) fn tcsetattr(
         termios2.c_cflag |= speed::encode(input_speed).unwrap_or(c::BOTHER) << c::IBSHIFT;
 
         // Copy in the control codes, since libc's `c_cc` array may have a
-        // different length from the ioctl's.
-        let nccs = termios2.c_cc.len();
-        termios2
-            .c_cc
-            .copy_from_slice(&termios.special_codes.0[..nccs]);
+        // different length from the ioctl's. 
+        let nccs = min(termios2.c_cc.len(), termios.special_codes.0.len());
+        termios2.c_cc[..nccs].copy_from_slice(&termios.special_codes.0[..nccs]);
 
         // Translate from `optional_actions` into a `TCSETS2` ioctl request
         // code. On MIPS, `optional_actions` has `TCSETS` added to it.