[task #10362] Match OSX behaviors where NSError is used

[Richard Frith-Macdonald]

URL:
  <http://savannah.gnu.org/task/?10362>

                 Summary: Match OSX behaviors where NSError is used
                 Project: GNUstep
            Submitted by: CaS
            Submitted on: Mon 03 May 2010 09:08:48 AM GMT
                Category: Foundation
         Should Start On: Mon 03 May 2010 12:00:00 AM GMT
   Should be Finished on: Fri 03 Dec 2010 12:00:00 AM GMT
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

OSX has added the NSError class and is increasingly adding methods which use
this instead of producing exceptions.  The GNUstep code largely leaves NSError
return values unpopulated or minimally populated.

We need to go through the methods which use NSError, and ensure that at least
the most common problems cause an NSError to be returned which matches the
behavior on OSX.

It would be good to provide testcases for the testsuite at the same time.

Difficulty level of this is quite low ... suitable for newcomers to the
project I'd think.




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