[Octave-bug-tracker] [bug #33670] bug in strfind

[Thomas Smed]

URL:
  <http://savannah.gnu.org/bugs/?33670>

                 Summary: bug in strfind
                 Project: GNU Octave
            Submitted by: thomassmed
            Submitted on: Wed 29 Jun 2011 01:39:26 PM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Crash
                  Status: None
             Assigned to: None
         Originator Name: Thomas Smed
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.4.0
        Operating System: GNU/Linux

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Details:

I use strfind to navigate in a file created by FORTRAN, the file contains a
mix of charaters, float and integers (big endian is used).
I found this error which I could simplify down to:
octave:1> test_str=' PAR     ';
octave:2> label='PAR   ';
octave:3> strfind(test_str,label)
ans =  2
octave:4> test_str(end)=255;
octave:5> strfind(test_str,label)
Now octave freezes and a triple ctrl-C is all that can take me out of the
deadlock.

Thus, when there is 255 in one byte, strfind collapses.

Another akward detail is that after I had been working a while 
with something else in one session of octave, and wanted to demonstrate the
error to a colleague, the error had disappeared.
I have however not been able to recreate how the make the error disappear. If
you try the above lines directly when getting in to octave, the error will be
present.





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