Possible string bug?

[John W. Eaton]

On 11-May-1999, Nick McGrogan <address@hidden> wrote:

| Being a novice Octave user I thought I should post this here in case
| I've done something really stupid, before being forward enough to
| report it as a bug...
| 
| A bit weird this.  The following C++ program:
| 
| #include <octave/oct.h>
| #include <octave/pager.h>
| 
| DEFUN_DLD (strtest, args, , "")
| {
|   string invar = args(0).string_value();
|   
|   octave_stdout << invar << "\n";
|   octave_stdout << invar.data() << "\n";
| 
|   return args;
| }
| 
| is a simple reduction to demonstrate the problem.
| 
| Given a string input this should echo it back twice to the screen,
| once as a C++ string class and then as a C-style char * string.  The
| second output, however, seems to get corrupted.
| 
| Typical output is:
| 
| octave:1> strtest("foo")
| foo
| footrtest__Fv
| ans = foo

The problem is that string::data() doesn't return a nul-terminated
string.  You need to use string::c_str() instead, or use some other
method to only print string::length() characters.

jwe