# [plt-scheme] Re: file: urls & their relation to path names

 From: Robby Findler (robby at cs.uchicago.edu) Date: Fri Jan 6 21:49:36 EST 2006 Previous message: [plt-scheme] file: urls & their relation to path names Next message: [plt-scheme] file: urls & their relation to path names Messages sorted by: [date] [thread] [subject] [author]

After poking around on the web a little bit, I found this:

http://blogs.msdn.com/freeassociations/archive/2005/05/19/420059.aspx

which suggests that the url for, say, /etc/hosts on my machine should
be:

file://%3f/etc/hosts

which seems to be in contradiction with the very beginning of
rfc3986, which says: "...refers to a file on the end-user's file
system (e.g., 'file:///etc/hosts')." Given the context of the rfc
quote, however, I'm inclined to think that is a bug in the rfc and
assume that the url should be as above.

Robby

On Jan 6, 2006, at 8:29 PM, Robby Findler wrote:

> It looks like there is a little bit of under-specification (or maybe a
> mistake?) in rfc 3986 about dealing with file: urls. For example,
> should the path:
>
>   /home/robby/tmp.ss
>
> be represented in the file: url as:
>
>   file:///%3f/home/robby/tmp.ss
>
> or as:
>
>   file:///home/robby/tmp.ss
>
> ?
>
> That is, should the first path element (namely the path that
> corresponds to the root of the filesystem, aka (build-path "/"))
> quoted as a special path in the file: url, or not.
>
> If not, what does that / correspond to on filesystems where the
> root is
> not "/", like windows? Should the file: url that points to the file
> "tmp.txt" in the c: drive be:
>
>   file:///c:/tmp.txt
>
> That is, should it have a forward slash ala the rfc to indicate
> "separate path segments here" or should it have the backwards slash
> like this:
>
>   file:///c:\tmp.txt
>
> which would, as far as the url is concerned, be treated as a file: url
> with only a single path element "c:\\tmp.txt".
>
> I think I'm going to go with the somewhat hackish behavior of
> specialcasing the first path segment and, if it is "/" I'll just drop
> it, but otherwise split of the path into the its segments from
> mzscheme's point of view and then put them together wish "/"s in
> between.
>
>   file:///home/robby/tmp.ss
>   file://c:/tmp.txt
>
> (This change will also affect how call/input-url works for file:
> urls.)
>
> Robby
>
>

 Posted on the users mailing list. Previous message: [plt-scheme] file: urls & their relation to path names Next message: [plt-scheme] file: urls & their relation to path names Messages sorted by: [date] [thread] [subject] [author]