• Andre Pany (25/25) Sep 27 2016 Hi,
• Vladimir Panteleev (7/30) Sep 28 2016 Since the file is opened in text mode (which is the default), the
• Andre Pany (12/20) Sep 28 2016 Thank you so much, I was already getting crazy about this. I just

Andre Pany <andre s-e-a-p.de> writes:

Hi,

following application creates a text file with strange content:

void writeTextFile(string filePath, string text)
{
	import std.stdio: File;
	auto f = File(filePath, "w");
	f.write(text);
	f.close();
}

void main()
{
	import std.ascii: newline;
	
	string s = "a=1"~newline~"b=2";
	writeTextFile("./test.txt", s);
}

Notepad++ detects the file as macintosh UTF8 file.
The file has following content:
a=1CR
CRLF
b=2

Where the first CR comes from? Is this a bug?
dmd v2.071.2 on win10

Kind regards
André

Vladimir Panteleev <thecybershadow.lists gmail.com> writes:

On Wednesday, 28 September 2016 at 06:52:51 UTC, Andre Pany wrote:
 Hi,

 following application creates a text file with strange content:

 void writeTextFile(string filePath, string text)
 {
 	import std.stdio: File;
 	auto f = File(filePath, "w");
 	f.write(text);
 	f.close();
 }

 void main()
 {
 	import std.ascii: newline;
 	
 	string s = "a=1"~newline~"b=2";
 	writeTextFile("./test.txt", s);
 }

 Notepad++ detects the file as macintosh UTF8 file.
 The file has following content:
 a=1CR
 CRLF
 b=2

 Where the first CR comes from? Is this a bug?
 dmd v2.071.2 on win10

Since the file is opened in text mode (which is the default), the 
C runtime automatically translates the single \n to a \r\n pair 
when writing the file. Since std.ascii.newline is defined to be 
"\r\n" on Windows, it ends up being written as "\r\r\n".

You could either open the file in binary mode (use "wb" as the 
second argument), or always use "\n" for line separators.

Andre Pany <andre s-e-a-p.de> writes:

On Wednesday, 28 September 2016 at 16:53:24 UTC, Vladimir 
Panteleev wrote:
 On Wednesday, 28 September 2016 at 06:52:51 UTC, Andre Pany 
 wrote:

 Since the file is opened in text mode (which is the default), 
 the C runtime automatically translates the single \n to a \r\n 
 pair when writing the file. Since std.ascii.newline is defined 
 to be "\r\n" on Windows, it ends up being written as "\r\r\n".

 You could either open the file in binary mode (use "wb" as the 
 second argument), or always use "\n" for line separators.

Thank you so much, I was already getting crazy about this. I just 
checked whether this information is included in library 
documentation for std.stdio.
If I havent't miss s.th. this isn't mentioned directly but only 
as a side information in this sentence: Use std.ascii.newline for 
portability (unless the file was opened in text mode).

I will create a bug report, for users without C knowledge, this 
is a trap:)

Kind regards
André