tools

package main

import (
	"errors"
	"flag"
	"fmt"
	"io"
	"os"
	"strings"
)

var spaces, magiscule bool
var tabCount, tabWidth, width int

func main() {
	flag.BoolVar(&spaces, "spaces", false, "Use spaces instead of tabs for indentation")
	flag.IntVar(&tabCount, "tabs", 1, "Number of tabs to indent per line")
	flag.IntVar(&tabWidth, "tab-width", 4, "Number of spaces per tab")
	flag.IntVar(&width, "width", 120, "Number of characters per line, including indentation")
	flag.BoolVar(&magiscule, "magiscule", false, "Use uppercase hex digits")
	flag.Parse()

	if len(flag.Args()) < 1 {
		fmt.Println("Usage: binclude file...")
		os.Exit(-1)
	}

	for _, a := range flag.Args() {
		if err := binclude(a); err != nil {
			fmt.Println(err)
			os.Exit(-1)
		}
	}
}

func binclude(name string) error {
	file, err := os.Open(name)
	if err != nil {
		return err
	}
	defer file.Close()

	hexWidth := width - (tabCount * tabWidth)
	hexCount := ((hexWidth - 5) / 6) + 1

	buf := make([]byte, hexCount)
	for {
		n, err := file.Read(buf)
		if err != nil {
			if errors.Is(err, io.EOF) {
				break
			}
			return err
		}
		if n == 0 {
			break
		}

		if spaces {
			fmt.Print(strings.Repeat(" ", tabCount*tabWidth))
		} else {
			fmt.Print(strings.Repeat("\t", tabCount))
		}

		for i := range n {
			if magiscule {
				fmt.Printf("0x%02X, ", buf[i])
			} else {
				fmt.Printf("0x%02x, ", buf[i])
			}
		}
		fmt.Println()
	}

	return nil
}