Reading unicode string with readf ("%s")

[Ali Çehreli via Digitalmars-d-learn]

On 11/03/2014 11:47 AM, Ivan Kazmenko wrote:
> On Monday, 3 November 2014 at 19:37:20 UTC, Ivan Kazmenko wrote:
>>     readf ("%s", &s);
>
> Worth noting: this reads to end-of-file (not end-of-line or whitespace),
> and reading the whole file into a string was what I indeed expected it
> to do.
>
> So, if there is an idiomatic way to read the whole file into a string
> which is Unicode-compatible, it would be great to learn that, too.

I don't know the answer to the Unicode issue with readf but you can read 
the file by chunks:

import std.stdio;
import std.array;
import std.exception;

string readAll(File file)
{
     char[666] buffer;
     char[] contents;
     char[] piece;

     do {
         piece = file.rawRead(buffer);
         contents ~= piece;

     } while (!piece.empty);

     return assumeUnique(contents);
}

void main () {
     string s = stdin.readAll();

     write (s);
}

Ali