[GRASS5] r.terraflow failure

[Andrew Danner]

Ed,

 Yes, grass binaries can be run under gdb and perhaps other debuggers. I
typically envoke gdb from within the GRASS command prompt so that the
proper environment variables are already set up.

-Andy

On Tue, 2006-02-21 at 09:17 -0800, endeitz wrote:
> Thanks very much for your help.  However, after replacing the fseek with
> fseeko, the result is the same.  Can grass binaries be run under a
> debugger(perhaps gdb)?  That way I could easily break on the value of the
> offset to see if that is where it is crashing.
> 
> Cheers,
> 
> Ed.
> 
> 
> Andrew Danner wrote:
> > 
> > My initial hunch is that this may be an fseek error. The function
> > scan3line where the assertion fails is opening three file descriptors or
> > "substreams" on a single file and calling fseek to move to the beginning
> > of a particular row.  However, fseek takes a 32-bit long offset which
> > overflows at 2GB. There is an fseeko in most stdio.h implementations
> > that takes a 64 bit off_t offset and works for larger files. 
> > 
> > Unfortunately I do not have time in the near future to investigate this
> > further. My initial suggestion is to change fseek to fseeko in line 397
> > of 
> > 
> > raster/r.terraflow/IOStream/include/ami_stream.h
> > 
> > rebuild the terraflow module and see if that works. Certainly, calling
> > fseek instead of fseeko is a problem, but I'm not sure if that is the
> > only problem. Terraflow is using 64-bit types that handle offsets larger
> > than 2GB in a lot of other places, but it may be a bit buggy in spots. 
> > 
> > If you try the fix, let me know what happens and perhaps I can help out
> > some more if things are still not working.  
> > 
> > 
> > -Andy
> > 
> > On Mon, 2006-02-20 at 08:24 -0800, endeitz wrote:
> >> Just a followup to my previous message.  Instead of using the snapshot
> >> binary
> > 
> > -snip-
> > 
> > 
> --
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> 
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