CODEWITHSUNDEEP
stringgoc-strings
Yash Srivastava
Yash Srivastava

Reputation: 992

How to create a null-terminated string in Go?

How to create a null-terminated string in Go?

What I'm currently trying is a:="golang\0" but it is showing compilation error:

non-octal character in escape sequence: "

Upvotes: 30

Views: 27965

Answers (3)

user13631587
user13631587

Reputation:

@icza describes how to write a string literal with a null terminator. Use this code to add a null to the end of a string variable:

 s += string(rune(0))

Example:

s := "hello"
s += string(rune(0))
fmt.Printf("%q\n", s)  // prints "hello\x00"

Upvotes: 1

Zombo
Zombo

Reputation: 1

Another option is the ByteSliceFromString function:

package main

import (
   "fmt"
   "golang.org/x/sys/windows"
)

func main() {
   b, e := windows.ByteSliceFromString("golang")
   if e != nil {
      panic(e)
   }
   fmt.Printf("%q\n", string(b)) // "golang\x00"
}

Upvotes: 1

icza
icza

Reputation: 417402

Spec: String literals:

The text between the quotes forms the value of the literal, with backslash escapes interpreted as they are in rune literals (except that \' is illegal and \" is legal), with the same restrictions. The three-digit octal (\nnn) and two-digit hexadecimal (\xnn) escapes represent individual bytes of the resulting string; all other escapes represent the (possibly multi-byte) UTF-8 encoding of individual characters.

So \0 is an illegal sequence, you have to use 3 octal digits:

s := "golang\000"

Or use hex code (2 hex digits):

s := "golang\x00"

Or a unicode sequence (4 hex digits):

s := "golang\u0000"

Example:

s := "golang\000"
fmt.Println([]byte(s))
s = "golang\x00"
fmt.Println([]byte(s))
s = "golang\u0000"
fmt.Println([]byte(s))

Output: all end with a 0-code byte (try it on the Go Playground).

[103 111 108 97 110 103 0]
[103 111 108 97 110 103 0]
[103 111 108 97 110 103 0]

Upvotes: 57

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