1/* dribble.c -- Dribble files for Info. */
2
3/* This file is part of GNU Info, a program for reading online documentation
4   stored in Info format.
5
6   Copyright (C) 1993 Free Software Foundation, Inc.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 2, or (at your option)
11   any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program; if not, write to the Free Software
20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21
22   Written by Brian Fox (bfox@ai.mit.edu). */
23
24#include "info.h"
25#include "dribble.h"
26
27/* When non-zero, it is a stream to write all input characters to for the
28   duration of this info session. */
29FILE *info_dribble_file = (FILE *)NULL;
30
31/* Open a dribble file named NAME, perhaps closing an already open one.
32   This sets the global variable INFO_DRIBBLE_FILE to the open stream. */
33void
34open_dribble_file (name)
35     char *name;
36{
37  /* Perhaps close existing dribble file. */
38  close_dribble_file ();
39
40  info_dribble_file = fopen (name, "w");
41
42#if defined (HAVE_SETVBUF)
43  if (info_dribble_file)
44#  if defined (SETVBUF_REVERSED)
45    setvbuf (info_dribble_file, _IONBF, (char *)NULL, 1);
46#  else
47    setvbuf (info_dribble_file, (char *)NULL, _IONBF, 1);
48#  endif /* !SETVBUF_REVERSED */
49#endif /* HAVE_SETVBUF */
50}
51
52/* If there is a dribble file already open, close it. */
53void
54close_dribble_file ()
55{
56  if (info_dribble_file)
57    {
58      fflush (info_dribble_file);
59      fclose (info_dribble_file);
60      info_dribble_file = (FILE *)NULL;
61    }
62}
63
64/* Write some output to our existing dribble file. */
65void
66dribble (byte)
67     unsigned char byte;
68{
69  if (info_dribble_file)
70    fwrite (&byte, sizeof (unsigned char), 1, info_dribble_file);
71}
72