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Speed up read_to_end helper function using buffer capacity for read size #35844

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Speed up read_to_end helper function using buffer capacity for read size #35844

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6 changes: 5 additions & 1 deletion src/libstd/io/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -345,7 +345,11 @@ fn append_to_string<F>(buf: &mut String, f: F) -> Result<usize>
fn read_to_end<R: Read + ?Sized>(r: &mut R, buf: &mut Vec<u8>) -> Result<usize> {
let start_len = buf.len();
let mut len = start_len;
let mut new_write_size = 16;
let mut new_write_size = if buf.capacity() > 16 {
buf.capacity() - buf.len()
} else {
16
};
let ret;
loop {
if len == buf.len() {
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