You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: read_1_5.go
    path of file: ./repos/plumber/vendor/github.com/aws/aws-sdk-go/internal/sdkrand
    
    the code of the file until where you have to start completion: // +build !go1.6

package sdkrand

import "math/rand"

// Read backfills Go 1.6's math.Rand.Reader for Go 1.5
func Read(r *rand.Rand, p []byte) (n int, err error) {
	// Copy of Go standard libraries math package's read function not added to
	// standard library until Go 1.6.
	var pos int8
	var
    
func Read(r *rand.Rand, p []byte) (n int, err error) {
	// Copy of Go standard libraries math package's read function not added to
	// standard library until Go 1.6.
	var pos int8
	var val int64
	for n = 0; n < len(p); n++ {
		if pos == 0 {
			val = r.Int63()
			pos = 7
		}
		p[n] = byte(val)
		val >>= 8
		pos--
	}

	return n, err
}