io::Take: avoid new BorrowedBuf creation in some case

a1phyr · a1phyr · commit 7d0cc4090d6e · 2025-03-28T15:58:41.000+01:00
diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
@@ -2989,7 +2989,7 @@ impl<T: Read> Read for Take<T> {
             return Ok(());
         }
 
-        if self.limit <= buf.capacity() as u64 {
+        if self.limit < buf.capacity() as u64 {
             // if we just use an as cast to convert, limit may wrap around on a 32 bit target
             let limit = cmp::min(self.limit, usize::MAX as u64) as usize;
 

Original file line number	Diff line number	Diff line change
`@@ -2989,7 +2989,7 @@ impl<T: Read> Read for Take<T> {`
`2989`	`2989`	`return Ok(());`
`2990`	`2990`	`}`
`2991`	`2991`
`2992`		`- if self.limit <= buf.capacity() as u64 {`
	`2992`	`+ if self.limit < buf.capacity() as u64 {`
`2993`	`2993`	`// if we just use an as cast to convert, limit may wrap around on a 32 bit target`
`2994`	`2994`	`let limit = cmp::min(self.limit, usize::MAX as u64) as usize;`
`2995`	`2995`