mikros/rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Only zero at most 64k at a time. We still use the doubling

Browse Source 
reallocation strategy since extend() calls reserve() and/or
push() for us.
This commit is contained in:
bcoopers 2015-03-30 13:59:32 -04:00
parent 8d3e55908a
commit 240734c31e
1 changed files with 4 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/libstd/io/mod.rs
View File

@ -101,18 +101,14 @@ 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 min_cap_bump = 16;
let mut new_write_size = 16;
let ret;
loop {
if len == buf.len() {
if buf.capacity() == buf.len() {
// reserve() rounds up our request such that every request
// (with maybe the exception of the first request) for the
// same amount of space doubles our capacity.
buf.reserve(min_cap_bump);
if new_write_size < DEFAULT_BUF_SIZE {
new_write_size *= 2;
}
let new_area = buf.capacity() - buf.len();
buf.extend(iter::repeat(0).take(new_area));
buf.extend(iter::repeat(0).take(new_write_size));
}
match r.read(&mut buf[len..]) {