xref: /freebsd-10.0-release/contrib/texinfo/info/dribble.c

/* dribble.c -- dribble files for Info.
   $Id: dribble.c,v 1.3 2004/04/11 17:56:45 karl Exp $

   Copyright (C) 1993, 1998, 2004 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

   Written by Brian Fox (bfox@ai.mit.edu). */

#include "info.h"
#include "dribble.h"

/* When non-zero, it is a stream to write all input characters to for the
   duration of this info session. */
FILE *info_dribble_file = (FILE *)NULL;

/* Open a dribble file named NAME, perhaps closing an already open one.
   This sets the global variable INFO_DRIBBLE_FILE to the open stream. */
void
open_dribble_file (char *name)
{
  /* Perhaps close existing dribble file. */
  close_dribble_file ();

  /* Keystrokes can be non-printable characters, so we need binary I/O.  */
  info_dribble_file = fopen (name, FOPEN_WBIN);

#if defined (HAVE_SETVBUF)
  if (info_dribble_file)
#  if defined (SETVBUF_REVERSED)
    setvbuf (info_dribble_file, _IONBF, (char *)NULL, 1);
#  else
    setvbuf (info_dribble_file, (char *)NULL, _IONBF, 1);
#  endif /* !SETVBUF_REVERSED */
#endif /* HAVE_SETVBUF */
}

/* If there is a dribble file already open, close it. */
void
close_dribble_file (void)
{
  if (info_dribble_file)
    {
      fflush (info_dribble_file);
      fclose (info_dribble_file);
      info_dribble_file = (FILE *)NULL;
    }
}

/* Write some output to our existing dribble file. */
void
dribble (unsigned char byte)
{
  if (info_dribble_file)
    fwrite (&byte, sizeof (unsigned char), 1, info_dribble_file);
}