Re: [Boost-users] [filesystem] how to set a file size?

Subject: Re: [Boost-users] [filesystem] how to set a file size?
From: Roland Bock (rbock_at_[hidden])
Date: 2009-10-13 16:37:01

Eric Niebler wrote:
> Roland Bock wrote:
>> Eric Niebler wrote:
>>>
>>> Forgive me for the n00b-ish (and slightly offtopic) question, but is 
>>> there any way in standard C++ or in Boost.Filesystem to truncate a 
>>> file to a particular size? With std::ofstream, I can either truncate 
>>> a file on open to 0 size, or else open it in overwrite mode and 
>>> scribble over it, but when I'm done, I don't seem to have a way of 
>>> saying, "The end of the file is now *here*." Is that right? And if 
>>> so, does Boost.Filesystem have an API for this?
>>
>> There are two posix functions ("truncate" and "ftruncate") which might 
>> do what you need.
> 
> It doesn't look like these functions exist for MSVC users. So it seems 
> there is no portable way to change the size of a file. Beman, would this 
> make a good addition to the filesystem library?

MSVC offers "_chsize_s" for such a task, which (of course), is not 
available for Linux...