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[Octave-bug-tracker] [bug #33330] fgets hangs octave when reading newlin

From: Rik
Subject: [Octave-bug-tracker] [bug #33330] fgets hangs octave when reading newline
Date: Tue, 17 May 2011 20:17:38 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1

Follow-up Comment #1, bug #33330 (project octave):

Confirmed.  The problem seems to be an attempt to mimic Matlab's behavior
exactly.  In this case it forces a kludge which works with files, which are
non-blocking I/O, but fails with pipes where the process blocks and waits for
new input.

If you are building from source, the solution is to comment out the kludge
which begins at line 988 of the file oct-stream.cc and encompasses this

if (! is.eof () && char_count > 0)
    // GAGME.  Matlab seems to check for EOF even if the last
    // character in a file is a newline character.  This is NOT
    // what the corresponding C-library functions do.
    int disgusting_compatibility_hack = is.get ();
    if (! is.eof ())
      is.putback (disgusting_compatibility_hack);

I'll also post something to the octave-maintainers mailing list.  It may be
that Matlab has changed and we can ditch this hack entirely.


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