[phobos] phobos commit, revision 1877

Andrei Alexandrescu andrei at erdani.com
Tue Aug 17 08:08:37 PDT 2010

Steve Schveighoffer wrote:
> ----- Original Message ----
>> From: Andrei Alexandrescu <andrei at erdani.com>
>> Steve Schveighoffer wrote:
>>> Second, you cannot do a tell on the file handle, because you  need to take 
>> into account the buffer.
>> My understanding is that calling  fflush() before lseek should be fine. See my 
>> upcoming  commit.
> I'll take a look.  But I think you cannot do a relative seek or a tell (which is 
> a relative seek of 0) without taking into account the buffer.
> Here is the issue:
> 1. you open a file.
> 2. you read 4 bytes.  The FILE object reads 4096 because it wants to fill up its 
> buffer.
> 3. you do a tell, expecting 4.  If the function does an lseek64 on the file 
> handle, it gets 4096.

I confirm this is the behavior. I finally found the way to do it on OSX 
- import core.sys.posix.stdio and then use fseeko and ftello. See my 
latest checkin.


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