From:	franl AT world DOT std DOT omit-this DOT com (Francis Litterio)
Subject:	Re: cygnus bugs
13 Jul 1997 09:23:17 -0700 :
Approved:	cygnus DOT gnu-win32 AT cygnus DOT com
Distribution:	cygnus
Message-ID:	<33c8f0a3.1384462.cygnus.gnu-win32@world.std.com>
References:	<199707121921 DOT JAA02783 AT haleakala DOT aloha DOT net> <199707130728 DOT RAA03575 AT murlibobo DOT cs DOT mu DOT OZ DOT AU>
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In wstd.mail.gnu-win32, you wrote:

> Tim Newsham <newsham AT aloha DOT net> writes:
> 
> >- cygwin does not properly transform command line path names across
> >  mount points.  If I am on drive "D:" and type "vi /tmp/foo",
> >  I end up editing "D:\tmp\foo" and not "C:\tmp\foo" even though
> >  "/tmp" is on "C:".  (vi is not compiled with cygwin).
> >  Cygwin should transform the path to "C:\tmp\foo" for the benefit
> >  of non-cygwin applications.
> 
> How can cygwin know which arguments are pathnames and which are
> just ordinary strings that should not be transformed in this manner?

Cygwin can know because the strings that are pathnames are passed to
open(), at which point cygwin looks in the mount table to find what
drive-and-directory the pathname actually refers to.  For example,
given this mount table:

% mount
Device           Directory           Type        Flags
\temp            /tmp                native      no-mixed,text=binary
c:               /                   native      no-mixed,text=binary
....

Then the pathname "/tmp" refers to c:\temp regardless of my current
drive.  Since vi uses open() to access the file, then the command "vi
/tmp/foo" must open c:\temp\foo regardless of which drive is my
currect drive.
--
Francis Litterio                           PGP Key Fingerprint:
franl AT world DOT std DOT omit-this DOT com              02 37 DF 6C 66 43 CD 2C
http://world.std.omit-this.com/~franl/     10 C8 B5 8B 57 34 F3 21

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