Function c_path 

pub fn c_path(
    operation: &'static str,
    path: &Path,
) -> Result<CString, PrimitiveError>

What: A path as the NUL-terminated C string the system calls take. Why: A path with an interior NUL byte can name no file, so it fails with EINVAL before any call, instead of reaching a system call with a truncated name.

In TS you’d write (pseudocode):

function cPath(operation: string, path: string): Buffer { if (path.includes('\0')) throw new PrimitiveError(operation, path, EINVAL); return Buffer.from(path + '\0'); }