Input redirection (was: Re: pb with oct file, return a matrix)

[John W. Eaton]

On 23-Apr-2009, Søren Hauberg wrote:

| tor, 23 04 2009 kl. 10:48 +0200, skrev Jaroslav Hajek:
| > you should use octave_stdout (pager.h) if you want your output to mix
| > with output of other functions normally. That includes going through
| > the pager if it is enabled. Writing directly to C's stdout bypasses
| > Octave's I/O mechanisms.
| 
| I always wondered why this is the case. Could we just do something like
| 
|   std::cout.rdbuf (octave_stdout.rdbuf ()); // untested
| 
| to send everything from stdout through the pager?

That does appear to work for cout, but it doesn't capture stdout.  For
example, try the following function:

  #include <octave/config.h>

  #include <iostream>
  #include <cstdio>

  #include <octave/defun-dld.h>
  #include <octave/pager.h>

  DEFUN_DLD (xfoo, , , "")
  {
    std::cout.rdbuf (octave_stdout.rdbuf ());

    int i = 0;

    for (; i < 30; i++)
      std::cout << i << std::endl;

    for (; i < 60; i++)
      printf ("%d\n", i);

    return octave_value_list ();
  }

jwe