Simple ring buffer

ring.go

package main

import (
	"fmt"
	"strings"
)

type Ring struct {
	buffer   []string
	size     int
	readPtr  int
	writePtr int
}

func NewRing(size int) (*Ring, error) {
	if size < 1 {
		return nil, fmt.Errorf("Buffer size must be greater than 0")
	}

	return &Ring{buffer: make([]string, size), size: size}, nil
}

func (r *Ring) Add(c string) {
	writePtr := r.writePtr
	r.buffer[writePtr] = c
	writePtr++
	r.writePtr = writePtr % r.size
}

func (r *Ring) Read() string {
	readPtr := r.readPtr
	c := r.buffer[readPtr]
	readPtr++
	r.readPtr = readPtr % r.size

	return c
}

func (r *Ring) Debug() string {
	return fmt.Sprintf("buf: %v\nsize: %d\nread: %d\nwrite: %d\n", r.buffer, r.size, r.readPtr, r.writePtr)
}

func main() {
	fmt.Println("Ring Buffer!")

	ring, err := NewRing(32)
	if err != nil {
		fmt.Println(err)
		return
	}

	str := strings.Split("Hello World!", "")
	for _, s := range str {
		ring.Add(s)
	}

	c := ring.Read()
	buf := []string{}
	for i := 0; i < 12; i++ {
		buf = append(buf, c)
		c = ring.Read()
	}

	fmt.Println(strings.Join(buf, ""))

	fmt.Println(ring.Debug())
}