libgo: Update to weekly.2012-01-27.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@183810 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 15 insertions, 2 deletions

diff --git a/libgo/go/io/ioutil/ioutil.go b/libgo/go/io/ioutil/ioutil.go
index 65f4b3ac2e5..cbe1a5839df 100644
--- a/libgo/go/io/ioutil/ioutil.go
+++ b/libgo/go/io/ioutil/ioutil.go
@@ -14,9 +14,22 @@ import (
 
 // readAll reads from r until an error or EOF and returns the data it read
 // from the internal buffer allocated with a specified capacity.
-func readAll(r io.Reader, capacity int64) ([]byte, error) {
+func readAll(r io.Reader, capacity int64) (b []byte, err error) {
 	buf := bytes.NewBuffer(make([]byte, 0, capacity))
-	_, err := buf.ReadFrom(r)
+	// If the buffer overflows, we will get bytes.ErrTooLarge.
+	// Return that as an error. Any other panic remains.
+	defer func() {
+		e := recover()
+		if e == nil {
+			return
+		}
+		if panicErr, ok := e.(error); ok && panicErr == bytes.ErrTooLarge {
+			err = panicErr
+		} else {
+			panic(e)
+		}
+	}()
+	_, err = buf.ReadFrom(r)
 	return buf.Bytes(), err
 }