[Issue 11374] New: Wrong UTF-8 decoding when calling File.readln(buf) with typeof(buf) == string.

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=11374

           Summary: Wrong UTF-8 decoding when calling File.readln(buf)
                    with typeof(buf) == string.
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: joanbrugueram at gmail.com


--- Comment #0 from joanbrugueram at gmail.com 2013-10-28 15:54:27 PDT ---
I'm sorry if this is not really a bug but just some ultra-obscure quirk.

Anyway, doing something like:

    string buf;
    stdin.readln(buf);

Appears to work, but seems to decode some characters wrong (consistently).
Using "char[] buf;" or "stdin.readln()" both work.

Here's a more complete test case:

***************************************************************

import std.stdio;

void main()
{
    ubyte[] weirdcharacterbytes = [0xf0, 0x90, 0xa4, 0x80];
    string weirdcharacter = cast(string)weirdcharacterbytes;

    {
        auto f = File("weirdcharacter.txt", "wb");
        f.rawWrite(weirdcharacterbytes);
    }

    {
        auto f = File("weirdcharacter.txt", "r");
        string s = f.readln();
        writeln(s == weirdcharacter ? "PASS" : "FAIL");
    }

    {
        auto f = File("weirdcharacter.txt", "r");
        char[] s;
        f.readln(s);
        writeln(s == weirdcharacter ? "PASS" : "FAIL");
    }

    {
        auto f = File("weirdcharacter.txt", "r");
        string s;
        f.readln(s);
        writeln(s == weirdcharacter ? "PASS" : "FAIL");
    }
}

***************************************************************

PASS
PASS
FAIL

***************************************************************

Thanks.

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