From eec49bbf59c922060a5785a47d885529e6cb2ac8 Mon Sep 17 00:00:00 2001
From: HTGAzureX1212 <39023054+HTGAzureX1212@users.noreply.github.com>
Date: Fri, 2 Feb 2024 20:49:20 +0800
Subject: add MAX_LEN_UTF8 and MAX_LEN_UTF16 constants

---
 library/alloc/src/string.rs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'library/alloc/src/string.rs')

diff --git a/library/alloc/src/string.rs b/library/alloc/src/string.rs
index b29f740ef0f..37e9e05a6a1 100644
--- a/library/alloc/src/string.rs
+++ b/library/alloc/src/string.rs
@@ -1419,7 +1419,9 @@ impl String {
     pub fn push(&mut self, ch: char) {
         match ch.len_utf8() {
             1 => self.vec.push(ch as u8),
-            _ => self.vec.extend_from_slice(ch.encode_utf8(&mut [0; 4]).as_bytes()),
+            _ => {
+                self.vec.extend_from_slice(ch.encode_utf8(&mut [0; char::MAX_LEN_UTF8]).as_bytes())
+            }
         }
     }
 
@@ -1716,7 +1718,7 @@ impl String {
     #[rustc_confusables("set")]
     pub fn insert(&mut self, idx: usize, ch: char) {
         assert!(self.is_char_boundary(idx));
-        let mut bits = [0; 4];
+        let mut bits = [0; char::MAX_LEN_UTF8];
         let bits = ch.encode_utf8(&mut bits).as_bytes();
 
         unsafe {
@@ -2771,7 +2773,7 @@ impl SpecToString for core::ascii::Char {
 impl SpecToString for char {
     #[inline]
     fn spec_to_string(&self) -> String {
-        String::from(self.encode_utf8(&mut [0; 4]))
+        String::from(self.encode_utf8(&mut [0; char::MAX_LEN_UTF8]))
     }
 }
 
-- 
cgit 1.4.1-3-g733a5