• helxi (42/42) May 28 2017 Hello, I just wrote a mock-up of Unix's $cat. However unlike the
• Adam D. Ruppe (12/14) May 28 2017 The readln docs for D say it returns null on end of file. The
• helxi (4/18) May 28 2017 Oh yes, fantastic,

helxi <brucewayneshit gmail.com> writes:

Hello, I just wrote a mock-up of Unix's $cat. However unlike the 
actual $cat, when input interrupt (Cntrl+D) is pressed the 
following program does not stop.

So I tried using C's EOF but the types aren't compatible since 
EOF is probably aliased to -1

//...
if (args.length < 2)
     {
         string input = readln();
         while (input != EOF)
         {
             input.write();
         }
     }
//...


Tips?



Here is the full program:



import std.stdio;
import std.file;

void main(string[] args)
{
     if (args.length < 2)
     {
         string input = readln();
         while (input != EOF)
         {
             input.write();
         }
     }
     else
     {
         foreach (path; args[1..$])
         {
             auto current_file = File(path, "r");
             while (!(current_file.eof()))
             {
                 current_file.readln().write();
             }
             current_file.close();
         }
     }
}

Adam D. Ruppe <destructionator gmail.com> writes:

On Sunday, 28 May 2017 at 22:07:12 UTC, helxi wrote:
 So I tried using C's EOF but the types aren't compatible since 
 EOF is probably aliased to -1


The readln docs for D say it returns null on end of file. The 
example given is:

import std.stdio;

void main()
{
     string line;
     while ((line = readln()) !is null)
         write(line);
}

http://dpldocs.info/experimental-docs/std.stdio.readln.1.html

I would try that.

helxi <brucewayneshit gmail.com> writes:

On Sunday, 28 May 2017 at 22:14:46 UTC, Adam D. Ruppe wrote:
 On Sunday, 28 May 2017 at 22:07:12 UTC, helxi wrote:
 So I tried using C's EOF but the types aren't compatible since 
 EOF is probably aliased to -1


 The readln docs for D say it returns null on end of file. The 
 example given is:

 import std.stdio;

 void main()
 {
     string line;
     while ((line = readln()) !is null)
         write(line);
 }

 http://dpldocs.info/experimental-docs/std.stdio.readln.1.html

 I would try that.

Oh yes, fantastic,
I also seem to have forgotten EOF was meant to compare chars, not 
strings.