[Octave-bug-tracker] [bug #47434] fwrite of integer types on Solaris writes little-endian (should be big-endian)

[Mike Miller]

URL:
  <http://savannah.gnu.org/bugs/?47434>

                 Summary: fwrite of integer types on Solaris writes
little-endian (should be big-endian)
                 Project: GNU Octave
            Submitted by: mtmiller
            Submitted on: Wed 16 Mar 2016 06:11:15 PM PDT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: In Progress
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Solaris/SunOS

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Details:

Writing multi-byte integers using fwrite writes them in little-endian format
regardless of what ARCH parameter is given to fopen or fwrite. The default
should be big-endian, and that is what Octave thinks it is internally, but the
bytes are written in little-endian order.

Example:


>> nm = tempname; fid = fopen (nm, "wb"); fwrite (fid, 1, "int16"); fclose
(fid); system (sprintf ("od -tx1 %s", nm)); unlink (nm);
0000000 01 00
0000002
>> nm = tempname; fid = fopen (nm, "wb"); fwrite (fid, 1, "int32"); fclose
(fid); system (sprintf ("od -tx1 %s", nm)); unlink (nm);
0000000 01 00 00 00
0000004
>> nm = tempname; fid = fopen (nm, "wb"); fwrite (fid, 1, "int64"); fclose
(fid); system (sprintf ("od -tx1 %s", nm)); unlink (nm);
0000000 01 00 00 00 00 00 00 00
0000010


The results are the same if either fopen or fwrite are given any of the
possible ARCH values.

I've started looking into this but getting lost in the octave_stream::write
templates and data conversion options.




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