Calculating how many SMS fragments will a message have

fragment_count.go

package main

import (
        "fmt"
        "math"
        "os"
        "unicode/utf8"
)

func calculateSmsFragments(message string) uint64 {
        mb_len := utf8.RuneCountInString(message)
        byte_len := len(message)
        max_message_length := 160
        max_multi_message_length := 153

        if mb_len != byte_len {
                max_message_length = 70
                max_multi_message_length = 67
        }

        if mb_len > max_message_length {
                return uint64(math.Ceil(float64(mb_len) / float64(max_multi_message_length)))
        }

        return 1
}

func main() {
        message := os.Args[1]
        fmt.Printf("Message \"%s\" will be sent as #%d fragments\n", message, calculateSmsFragments(message))
}