Rollup merge of rust-lang#118956 - danielhuang:patch-2, r=workingjubilee

Make CStr documentation consistent ("nul" instead of "null")

"nul" is used in method names and appears more often in the documentation than "null", so make all instances "nul" to keep it consistent.

Author: workingjubilee

library/alloc/src/ffi/c_str.rs

@@ -421,7 +421,7 @@ impl CString {
     /// Failure to call [`CString::from_raw`] will lead to a memory leak.
     ///
     /// The C side must **not** modify the length of the string (by writing a
-    /// `null` somewhere inside the string or removing the final one) before
+    /// nul byte somewhere inside the string or removing the final one) before
     /// it makes it back into Rust using [`CString::from_raw`]. See the safety section
     /// in [`CString::from_raw`].
     ///
@@ -797,7 +797,7 @@ impl From<Box<CStr>> for CString {
 #[stable(feature = "cstring_from_vec_of_nonzerou8", since = "1.43.0")]
 impl From<Vec<NonZeroU8>> for CString {
     /// Converts a <code>[Vec]<[NonZeroU8]></code> into a [`CString`] without
-    /// copying nor checking for inner null bytes.
+    /// copying nor checking for inner nul bytes.
     #[inline]
     fn from(v: Vec<NonZeroU8>) -> CString {
         unsafe {
@@ -809,7 +809,7 @@ impl From<Vec<NonZeroU8>> for CString {
                 let (ptr, len, cap): (*mut NonZeroU8, _, _) = Vec::into_raw_parts(v);
                 Vec::from_raw_parts(ptr.cast::<u8>(), len, cap)
             };
-            // SAFETY: `v` cannot contain null bytes, given the type-level
+            // SAFETY: `v` cannot contain nul bytes, given the type-level
             // invariant of `NonZeroU8`.
             Self::_from_vec_unchecked(v)
         }

library/core/src/ffi/c_str.rs

@@ -205,7 +205,7 @@ impl CStr {
     /// * The memory pointed to by `ptr` must contain a valid nul terminator at the
     ///   end of the string.
     ///
-    /// * `ptr` must be [valid] for reads of bytes up to and including the null terminator.
+    /// * `ptr` must be [valid] for reads of bytes up to and including the nul terminator.
     ///   This means in particular:
     ///
     ///     * The entire memory range of this `CStr` must be contained within a single allocated object!
@@ -415,7 +415,7 @@ impl CStr {
             let mut i = bytes.len().saturating_sub(1);
             assert!(!bytes.is_empty() && bytes[i] == 0, "input was not nul-terminated");
 
-            // Ending null byte exists, skip to the rest.
+            // Ending nul byte exists, skip to the rest.
             while i != 0 {
                 i -= 1;
                 let byte = bytes[i];