A brainfuck interpreter written in go

brainfuck-interpreter.go

package main

import (
	"fmt"
	"io/ioutil"
	"os"
)

func interpret(instructions []byte) {
	memory := make([]uint8, 30000)
	pointer := 0

	for index := 0; index < len(instructions); index++ {
		switch instructions[index] {
		case '>':
			pointer++
		case '<':
			pointer--
		case '+':
			memory[pointer]++
		case '-':
			memory[pointer]--
		case '.':
			fmt.Printf("%c", memory[pointer])
		case ',':
			read := make([]byte, 1)
			os.Stdin.Read(read)
			memory[pointer] = read[0]
		case '[':
			if memory[pointer] == 0 {
				for depth := 1; depth > 0; {
					index++
					if instructions[index] == '[' {
						depth++
					} else if instructions[index] == ']' {
						depth--
					}
				}
			}
		case ']':
			if memory[pointer] != 0 {
				for  depth := 1; depth > 0; {
					index--
					if instructions[index] == ']' {
						depth++
					} else if instructions[index] == '[' {
						depth--
					}
				}
			}

		}
	}
}

func main() {
	if len(os.Args) < 2 {
		fmt.Printf("No brainfuck file supplied\n")
		return
	}

	instructions, err := ioutil.ReadFile(os.Args[1])
	if (err != nil) {
		fmt.Printf("Error reading file: %v", err.Error())
		return
	}

	interpret(instructions)
	fmt.Printf("\n")
}