PHP's inet_ntop in TypeScript

How to use

Install via yarn add locutus and import: import { inet_ntop } from 'locutus/php/network/inet_ntop'.

Or with CommonJS: const { inet_ntop } = require('locutus/php/network/inet_ntop')

Use a bundler that supports tree-shaking so you only ship the functions you actually use. Vite, webpack, Rollup, and Parcel all handle this. For server-side use this is less of a concern.

Examples

These examples are extracted from test cases that automatically verify our functions against their native counterparts.

#	code	expected result
1	inet_ntop('\x7F\x00\x00\x01')	'127.0.0.1'

Here's what our current TypeScript equivalent to PHP's inet_ntop looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

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export function inet_ntop(a: string | number): string | false {
  //  discuss at: https://locutus.io/php/inet_ntop/
  // original by: Theriault (https://github.com/Theriault)
  //   example 1: inet_ntop('\x7F\x00\x00\x01')
  //   returns 1: '127.0.0.1'
  //   _example 2: inet_ntop('\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1')
  //   _returns 2: '::1'

  let i = 0
  let m = ''
  const c: string[] = []
  const address = String(a)

  if (address.length === 4) {
    // IPv4
    return [address.charCodeAt(0), address.charCodeAt(1), address.charCodeAt(2), address.charCodeAt(3)].join('.')
  } else if (address.length === 16) {
    // IPv6
    for (i = 0; i < 16; i++) {
      c.push(((address.charCodeAt(i++) << 8) + address.charCodeAt(i)).toString(16))
    }
    return c
      .join(':')
      .replace(/((^|:)0(?=:|$))+:?/g, function (t) {
        m = t.length > m.length ? t : m
        return t
      })
      .replace(m || ' ', '::')
  } else {
    // Invalid length
    return false
  }
}

export function inet_ntop(a) {
  //  discuss at: https://locutus.io/php/inet_ntop/
  // original by: Theriault (https://github.com/Theriault)
  //   example 1: inet_ntop('\x7F\x00\x00\x01')
  //   returns 1: '127.0.0.1'
  //   _example 2: inet_ntop('\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1')
  //   _returns 2: '::1'

  let i = 0
  let m = ''
  const c = []
  const address = String(a)

  if (address.length === 4) {
    // IPv4
    return [address.charCodeAt(0), address.charCodeAt(1), address.charCodeAt(2), address.charCodeAt(3)].join('.')
  } else if (address.length === 16) {
    // IPv6
    for (i = 0; i < 16; i++) {
      c.push(((address.charCodeAt(i++) << 8) + address.charCodeAt(i)).toString(16))
    }
    return c
      .join(':')
      .replace(/((^|:)0(?=:|$))+:?/g, function (t) {
        m = t.length > m.length ? t : m
        return t
      })
      .replace(m || ' ', '::')
  } else {
    // Invalid length
    return false
  }
}

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Locutus is a community effort following The McDonald's Theory: we ship first iterations, hoping others will improve them. If you see something that could be better, we'd love your contribution.

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