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bufio: simplify bufio.Reader.ReadBytes to avoid an extra loop over a slice

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Change-Id: Icb1c3eb30147180ba5949a25c65b48307b14c1ca
GitHub-Last-Rev: 937ae86413
GitHub-Pull-Request: golang/go#34704
Reviewed-on: https://go-review.googlesource.com/c/go/+/199157
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Alex Gaynor 2019-10-04 20:33:00 +00:00 committed by Ian Lance Taylor
parent c1b7f508b0
commit 5f4aa5d79f
1 changed files with 4 additions and 6 deletions
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10
src/bufio/bufio.go
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@ -432,6 +432,7 @@ func (b *Reader) ReadBytes(delim byte) ([]byte, error) {
var frag []byte
var full [][]byte
var err error
n := 0
for {
var e error
frag, e = b.ReadSlice(delim)
@ -447,18 +448,15 @@ func (b *Reader) ReadBytes(delim byte) ([]byte, error) {
buf := make([]byte, len(frag))
copy(buf, frag)
full = append(full, buf)
n += len(buf)
}
// Allocate new buffer to hold the full pieces and the fragment.
n := 0
for i := range full {
n += len(full[i])
}
n += len(frag)
// Copy full pieces and fragment in.
// Allocate new buffer to hold the full pieces and the fragment.
buf := make([]byte, n)
n = 0
// Copy full pieces and fragment in.
for i := range full {
n += copy(buf[n:], full[i])
}