libgo: Update to current version of master library.

From-SVN: r193688

4 files changed, 44 insertions, 4 deletions

diff --git a/libgo/go/bytes/buffer_test.go b/libgo/go/bytes/buffer_test.go
index dfecea1..92e2914 100644
--- a/libgo/go/bytes/buffer_test.go
+++ b/libgo/go/bytes/buffer_test.go
@@ -251,10 +251,10 @@ func TestReadFrom(t *testing.T) {
 func TestWriteTo(t *testing.T) {
 	var buf Buffer
 	for i := 3; i < 30; i += 3 {
-		s := fillBytes(t, "TestReadFrom (1)", &buf, "", 5, testBytes[0:len(testBytes)/i])
+		s := fillBytes(t, "TestWriteTo (1)", &buf, "", 5, testBytes[0:len(testBytes)/i])
 		var b Buffer
 		buf.WriteTo(&b)
-		empty(t, "TestReadFrom (2)", &b, s, make([]byte, len(data)))
+		empty(t, "TestWriteTo (2)", &b, s, make([]byte, len(data)))
 	}
 }
 
diff --git a/libgo/go/bytes/bytes_test.go b/libgo/go/bytes/bytes_test.go
index 124760a..2311329 100644
--- a/libgo/go/bytes/bytes_test.go
+++ b/libgo/go/bytes/bytes_test.go
@@ -1026,7 +1026,7 @@ func TestEqualFold(t *testing.T) {
 
 var makeFieldsInput = func() []byte {
 	x := make([]byte, 1<<20)
-	// Input is ~10% space, ~10% 2-byte UTF-8, rest ASCII non-space. 
+	// Input is ~10% space, ~10% 2-byte UTF-8, rest ASCII non-space.
 	for i := range x {
 		switch rand.Intn(10) {
 		case 0:
diff --git a/libgo/go/bytes/reader.go b/libgo/go/bytes/reader.go
index a062e54..b34dfc1 100644
--- a/libgo/go/bytes/reader.go
+++ b/libgo/go/bytes/reader.go
@@ -10,7 +10,7 @@ import (
 	"unicode/utf8"
 )
 
-// A Reader implements the io.Reader, io.ReaderAt, io.Seeker,
+// A Reader implements the io.Reader, io.ReaderAt, io.WriterTo, io.Seeker,
 // io.ByteScanner, and io.RuneScanner interfaces by reading from
 // a byte slice.
 // Unlike a Buffer, a Reader is read-only and supports seeking.
@@ -121,5 +121,24 @@ func (r *Reader) Seek(offset int64, whence int) (int64, error) {
 	return abs, nil
 }
 
+// WriteTo implements the io.WriterTo interface.
+func (r *Reader) WriteTo(w io.Writer) (n int64, err error) {
+	r.prevRune = -1
+	if r.i >= len(r.s) {
+		return 0, io.EOF
+	}
+	b := r.s[r.i:]
+	m, err := w.Write(b)
+	if m > len(b) {
+		panic("bytes.Reader.WriteTo: invalid Write count")
+	}
+	r.i += m
+	n = int64(m)
+	if m != len(b) && err == nil {
+		err = io.ErrShortWrite
+	}
+	return
+}
+
 // NewReader returns a new Reader reading from b.
 func NewReader(b []byte) *Reader { return &Reader{b, 0, -1} }
diff --git a/libgo/go/bytes/reader_test.go b/libgo/go/bytes/reader_test.go
index 2e4b1f2..6668818 100644
--- a/libgo/go/bytes/reader_test.go
+++ b/libgo/go/bytes/reader_test.go
@@ -86,3 +86,24 @@ func TestReaderAt(t *testing.T) {
 		}
 	}
 }
+
+func TestReaderWriteTo(t *testing.T) {
+	for i := 3; i < 30; i += 3 {
+		s := data[:len(data)/i]
+		r := NewReader(testBytes[:len(testBytes)/i])
+		var b Buffer
+		n, err := r.WriteTo(&b)
+		if expect := int64(len(s)); n != expect {
+			t.Errorf("got %v; want %v", n, expect)
+		}
+		if err != nil {
+			t.Errorf("got error = %v; want nil", err)
+		}
+		if b.String() != s {
+			t.Errorf("got string %q; want %q", b.String(), s)
+		}
+		if r.Len() != 0 {
+			t.Errorf("reader contains %v bytes; want 0", r.Len())
+		}
+	}
+}