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[Octave-bug-tracker] [bug #53148] NULL characters not processed correctl

From: Rik
Subject: [Octave-bug-tracker] [bug #53148] NULL characters not processed correctly in *printf() family of functions
Date: Tue, 13 Feb 2018 17:23:02 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0


                 Summary: NULL characters not processed correctly in *printf()
family of functions
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Tue 13 Feb 2018 02:23:00 PM PST
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any



NULL characters in the format string of a printf() function terminate the
string.  This was discovered with sprintf().  For example,

s = sprintf ("B\0B")
s = B
double (s)
ans =  66

This doesn't look magically easy to fix.  For sprintf() an octave_ostrstream
object is created (see Fsprintf in file-io.cc) which eventually calls the
method str() to return a string object.  Looking in octave-stream.cc this is
calling std::ostringstream::str().

Perhaps the stream can be opened in binary format at the beginning, but I
don't know what effect that will have on ordinary text sequences like "\n".


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