Remove unused CStr implementation

src/bin/cstr/mod.rs

@@ -1,47 +0,0 @@
-use std::fmt::{self, Display, Write as _};
-use std::slice;
-use std::str;
-
-#[allow(non_camel_case_types)]
-type c_char = i8;
-
-pub struct CStr {
-    ptr: *const u8,
-}
-
-impl CStr {
-    pub unsafe fn from_ptr(ptr: *const c_char) -> Self {
-        CStr { ptr: ptr.cast() }
-    }
-}
-
-impl Display for CStr {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        let len = unsafe { strlen(self.ptr) };
-        let mut bytes = unsafe { slice::from_raw_parts(self.ptr, len) };
-        loop {
-            match str::from_utf8(bytes) {
-                Ok(valid) => return formatter.write_str(valid),
-                Err(utf8_error) => {
-                    let valid_up_to = utf8_error.valid_up_to();
-                    let valid = unsafe { str::from_utf8_unchecked(&bytes[..valid_up_to]) };
-                    formatter.write_str(valid)?;
-                    formatter.write_char(char::REPLACEMENT_CHARACTER)?;
-                    if let Some(error_len) = utf8_error.error_len() {
-                        bytes = &bytes[valid_up_to + error_len..];
-                    } else {
-                        return Ok(());
-                    }
-                }
-            }
-        }
-    }
-}
-
-unsafe fn strlen(s: *const u8) -> usize {
-    let mut end = s;
-    while *end != 0 {
-        end = end.add(1);
-    }
-    end.offset_from(s) as usize
-}