[Octave-bug-tracker] [bug #43351] format + crashes the GUI

[Andreas Weber]

Follow-up Comment #4, bug #43351 (project octave):

In pr-output.cc the chars for "format plus" are defined as

// First char for > 0, second for < 0, third for == 0.
static std::string plus_format_chars = "+  ";


(not as "+- " as matlab does but this isn't the problem here, only a ML
incompatibility)

I think the problem is in ov-base-mat.cc:479 (default branch)

std::ostringstream buf;
octave_print_internal (buf, matrix(j*nr+i));
std::string tmp = buf.str ();
size_t pos = tmp.find_first_not_of (" ");
os << tmp.substr (pos);


where "size_t pos = tmp.find_first_not_of (" ");" returns "string::npos" (not
found) and then "os << tmp.substr (pos);" throws a out_of_range which isn't
cached.

The same problem is also in ov-base-scalar.cc for "a=-1;format +"

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