[Octave-bug-tracker] [bug #56396] sscanf third output (error message) is empty even when pattern fails to match

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?56396>

                 Summary: sscanf third output (error message) is empty even
when pattern fails to match
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Mon 27 May 2019 08:25:56 AM PDT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Missed Error or Warning
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.1.0
        Operating System: Any

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Details:

This bug was uncovered by bug #56200 about the fourth argument of sscanf being
incorrect in certain cases.

Consider the following example:


[val, count, errmsg, nextpos] = sscanf ('1234a6', '%2d', 3)


According to the documentation, and verified with Matlab, this should return
two numbers in the array val ([12; 34]), count is 2, the nextpos position in
the stream is 5, and errsmsg should contain some text about how the pattern
failed to match.

In Octave, however, the third argument is empty.



val =

   12
   34

count =  2
errmsg = 
nextpos =  5






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