Re: vim swap file format

Yep, I know vim tells me, the user, whether it's modified; I just want
to be able to tell programatically as well. The position 03ef part is
something new to go on. Thanks.

Cheers,
MS.

On Dec 11, 9:33 am, Andy Wokula <anw...@yahoo.de> wrote:
> Am 29.11.2009 18:16, schrieb Michael Scheper:
>
> > G'day everyone,
>
> > I've been fruitlessly searching for documentation on the format of vim
> > swap files. Does anybody have a link for that? All I want is a way to
> > tell whether the swap file is for a file that's been modified. It
> > seems that most of the time, swap files for modified files start with
> > an uppercase 'U', but this isn't an entirely reliable indicator.
>
> > Thanks,
> > MS.
>
> My swap files start with "b0VIM 7.2".  When I edit a file for which a
> swap file exists, I get
>
> E325: ATTENTION
> Found a swap file ...
>      dated ...
>      file name ...
>      modified: YES       <-- (!)
>      ...
>
> So Vim informs me about the last 'modified' state (= state just before
> the session was interrupted).
>
> You are right about the 'U': Vim's source code confirms that a magical
> 'U' character (0x55) at position 0x000003EF in the swap file indicates
> the 'modified' state (0x00 otherwise).  (see memfile.c, struct block0)
>
> --
> Andy

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