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: jsonstring.go
    path of file: ./repos/fabio/vendor/github.com/go-logfmt/logfmt
    
    the code of the file until where you have to start completion: package logfmt

import (
	"bytes"
	"io"
	"strconv"
	"sync"
	"unicode"
	"unicode/utf16"
	"unicode/utf8"
)

// Taken from Go's encoding/json and modified for use here.

// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

var hex = "0123456789abcdef"

var bufferPool = sync.Pool{
	New: func() interface{} {
		return &bytes.Buffer{}
	},
}

func getBuffer() *bytes.Buffer {
	return bufferPool.Get().(*bytes.Buffer)
}

func poolBuffer(buf *bytes.Buffer) {
	buf.Reset()
	bufferPool.Put(buf)
}

// NOTE: keep in sync with writeQuotedBytes below.
func writeQuotedString(w io.Writer, s string) (int, error) {
	buf := getBuffer()
	buf.WriteByte('"')
	start := 0
	for i := 0; i < len(s); {
		if b := s[i]; b < utf8.RuneSelf {
			if 0x20 <= b && b != '\\' && b != '"' {
				i++
				continue
			}
			if start < i {
				buf.WriteString(s[start:i])
			}
			switch b {
			case '\\', '"':
				buf.WriteByte('\\')
				buf.WriteByte(b)
			case '\n':
				buf.
    
func writeQuotedString(w io.Writer, s string) (int, error) {
	buf := getBuffer()
	buf.WriteByte('"')
	start := 0
	for i := 0; i < len(s); {
		if b := s[i]; b < utf8.RuneSelf {
			if 0x20 <= b && b != '\\' && b != '"' {
				i++
				continue
			}
			if start < i {
				buf.WriteString(s[start:i])
			}
			switch b {
			case '\\', '"':
				buf.WriteByte('\\')
				buf.WriteByte(b)
			case '\n':
				buf.WriteByte('\\')
				buf.WriteByte('n')
			case '\r':
				buf.WriteByte('\\')
				buf.WriteByte('r')
			case '\t':
				buf.WriteByte('\\')
				buf.WriteByte('t')
			default:
				// This encodes bytes < 0x20 except for \n, \r, and \t.
				buf.WriteString(`\u00`)
				buf.WriteByte(hex[b>>4])
				buf.WriteByte(hex[b&0xF])
			}
			i++
			start = i
			continue
		}
		c, size := utf8.DecodeRuneInString(s[i:])
		if c == utf8.RuneError {
			if start < i {
				buf.WriteString(s[start:i])
			}
			buf.WriteString(`\ufffd`)
			i += size
			start = i
			continue
		}
		i += size
	}
	if start < len(s) {
		buf.WriteString(s[start:])
	}
	buf.WriteByte('"')
	n, err := w.Write(buf.Bytes())
	poolBuffer(buf)
	return n, err
}