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libcore: rewrite io::MemBuffer.write to use memcpy (#2004)

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This commit is contained in:
Erick Tryzelaar 2012-08-26 21:21:59 -07:00
parent 7bb65848a1
commit 9074d9b581
1 changed files with 13 additions and 16 deletions
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29
src/libcore/io.rs
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@ -663,24 +663,21 @@ fn stderr() -> Writer { fd_writer(libc::STDERR_FILENO as c_int, false) }
impl MemBuffer: Writer {
fn write(v: &[const u8]) {
// Fast path.
let vlen = vec::len(v);
let buf_len = self.buf.len();
if self.pos == buf_len {
self.buf.push_all(v);
self.pos += vlen;
return;
}
do self.buf.swap |buf| {
let mut buf <- buf;
let v_len = v.len();
let buf_len = buf.len();
// FIXME #2004--use memcpy here?
let mut pos = self.pos, vpos = 0u;
while vpos < vlen && pos < buf_len {
self.buf.set_elt(pos, copy v[vpos]);
pos += 1u;
vpos += 1u;
let count = uint::max(&buf_len, &(self.pos + v_len));
vec::reserve(buf, count);
unsafe { vec::unsafe::set_len(buf, count); }
vec::u8::memcpy(vec::mut_view(buf, self.pos, count), v, v_len);
self.pos += v_len;
buf
}
self.buf.push_slice(v, vpos, vlen);
self.pos += vlen;
}
fn seek(offset: int, whence: SeekStyle) {
let pos = self.pos;