[swift-users] Simple text file I/O with Swift 3

[Ken Burgett via swift-users]

Hi all,

I am trying to understand how Swift 3 File I/O works in a linux 
environment.  I put together a trivial test program using what I
can glean from the few examples I can find.  See below.
===============================
import Glibc
import Foundation

let filename = Process.arguments[1]
let file_handle = fopen (filename, "r")
let BUFSIZE = 1024
var buf     = [CChar](repeating:CChar(0), count:BUFSIZE)
while fgets(&buf, Int32(BUFSIZE), file_handle) != nil
{
  print(buf)
}
exit(0)
===============================

The program runs, but produces a stream of integer arrays, each of 1024 
bytes.  I can see what appears to be ASCII character values in the 
sample text, plus a lot of trailing zeros.  I suspect I haven't mapped 
the bytes in buf to Strings, so how should that be done?
--
Ken Burgett
Principal Software Engineer
Email: k...@iotone.io
Office: 530.693.4449
Mobile: 831.332.6846
URL: www.iotone.coimport Glibc
import Foundation
//
// 'main program'
//
// command: "blake2b filename [key]", 
//
guard Process.arguments.count == 2 else 
{
  print("Usage:  blake2b FILENAME")
  exit(-1)
}

let filename = Process.arguments[1]

let file_handle = fopen (filename, "r")

let BUFSIZE = 1024

var buf     = [CChar](repeating:CChar(0), count:BUFSIZE)

while fgets(&buf, Int32(BUFSIZE), file_handle) != nil {
  print(buf)
}

exit(0)
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