How do I truncate a file, delete bytes, or set the end of file from a stream?

For example, what would be the easiest way to delete the last 4 bytes from a file?

On Sun, 12 Jun 2011 02:47:01 -0400, XP1 <nospam@nospam.com> wrote:

>
> How do I truncate a file, delete bytes, or set the end of file from a stream?
>
> For example, what would be the easiest way to delete the last 4 bytes from a file?

Anyone?

On Wed, 15 Jun 2011 13:30:25 -0400, XP1 <nospam@nospam.com> wrote:

> On Sun, 12 Jun 2011 02:47:01 -0400, XP1 <nospam@nospam.com> wrote:
>
>>
>> How do I truncate a file, delete bytes, or set the end of file from a stream?
>>
>> For example, what would be the easiest way to delete the last 4 bytes from a file?
>
> Anyone?

If you are on linux, ftruncate(int fd, size_t size);

http://linux.die.net/man/2/truncate

If you are on Windows, _chsize(int handle, int size);

http://www.digitalmars.com/rtl/io.html#_chsize

Don't know about MacOS or BSD, they probably follow the linux function.

-Steve