diff --git a/native/src/base/cstr.rs b/native/src/base/cstr.rs
index 2e21278ae..60e1cb77f 100644
--- a/native/src/base/cstr.rs
+++ b/native/src/base/cstr.rs
@@ -34,13 +34,6 @@ use crate::slice_from_ptr_mut;
 // Utf8CString, Utf8CStrBufRef, and Utf8CStrBufArr<N> implements Utf8CStrWrite.
 // Utf8CStrBufRef and Utf8CStrBufArr<N> implements Utf8CStrBuf.
 
-pub fn copy_cstr<T: AsRef<CStr> + ?Sized>(dest: &mut [u8], src: &T) -> usize {
-    let src = src.as_ref().to_bytes_with_nul();
-    let len = min(src.len(), dest.len());
-    dest[..len].copy_from_slice(&src[..len]);
-    len - 1
-}
-
 fn utf8_cstr_buf_append(buf: &mut dyn Utf8CStrBuf, s: &[u8]) -> usize {
     let mut used = buf.len();
     if used >= buf.capacity() - 1 {
@@ -49,7 +42,9 @@ fn utf8_cstr_buf_append(buf: &mut dyn Utf8CStrBuf, s: &[u8]) -> usize {
     }
     let dest = unsafe { &mut buf.mut_buf()[used..] };
     let len = min(s.len(), dest.len() - 1);
-    dest[..len].copy_from_slice(&s[..len]);
+    if len > 0 {
+        dest[..len].copy_from_slice(&s[..len]);
+    }
     dest[len] = b'\0';
     used += len;
     unsafe { buf.set_len(used) };
diff --git a/native/src/base/files.rs b/native/src/base/files.rs
index 25f29e3d0..848d790a5 100644
--- a/native/src/base/files.rs
+++ b/native/src/base/files.rs
@@ -5,7 +5,9 @@ use std::fs::File;
 use std::io::{BufRead, BufReader, Read, Seek, SeekFrom, Write};
 use std::ops::Deref;
 use std::os::fd::{AsFd, BorrowedFd, IntoRawFd};
+use std::os::unix::ffi::OsStrExt;
 use std::os::unix::io::{AsRawFd, FromRawFd, OwnedFd, RawFd};
+use std::path::Path;
 use std::{io, mem, ptr, slice};
 
 use bytemuck::{bytes_of_mut, Pod};
@@ -17,8 +19,8 @@ use num_traits::AsPrimitive;
 
 use crate::cxx_extern::readlinkat_for_cxx;
 use crate::{
-    copy_cstr, cstr, errno, error, FsPath, FsPathBuf, LibcReturn, Utf8CStr, Utf8CStrBuf,
-    Utf8CStrBufArr,
+    cstr, errno, error, FsPath, FsPathBuf, LibcReturn, Utf8CStr, Utf8CStrBuf, Utf8CStrBufArr,
+    Utf8CStrWrite,
 };
 
 pub fn __open_fd_impl(path: &Utf8CStr, flags: i32, mode: mode_t) -> io::Result<OwnedFd> {
@@ -631,11 +633,14 @@ impl FsPath {
     }
 
     pub fn mkdirs(&self, mode: mode_t) -> io::Result<()> {
-        let mut buf = [0_u8; 4096];
-        let len = copy_cstr(&mut buf, self);
-        let buf = &mut buf[..len];
+        if self.is_empty() {
+            return Ok(());
+        }
+        let mut arr = Utf8CStrBufArr::default();
+        arr.push_str(self);
         let mut off = 1;
         unsafe {
+            let buf = arr.as_bytes_mut();
             while let Some(p) = buf[off..].iter().position(|c| *c == b'/') {
                 buf[off + p] = b'\0';
                 if libc::mkdir(buf.as_ptr().cast(), mode) < 0 && *errno() != EEXIST {