contrib/texinfo-4/info/dribble.c

   1 /* dribble.c -- dribble files for Info.
   2    $Id: dribble.c,v 1.3 2004/04/11 17:56:45 karl Exp $
   3
   4    Copyright (C) 1993, 1998, 2004 Free Software Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20    Written by Brian Fox (bfox@ai.mit.edu). */
  21
  22 #include "info.h"
  23 #include "dribble.h"
  24
  25 /* When non-zero, it is a stream to write all input characters to for the
  26    duration of this info session. */
  27 FILE *info_dribble_file = (FILE *)NULL;
  28
  29 /* Open a dribble file named NAME, perhaps closing an already open one.
  30    This sets the global variable INFO_DRIBBLE_FILE to the open stream. */
  31 void
  32 open_dribble_file (char *name)
  33 {
  34   /* Perhaps close existing dribble file. */
  35   close_dribble_file ();
  36
  37   /* Keystrokes can be non-printable characters, so we need binary I/O.  */
  38   info_dribble_file = fopen (name, FOPEN_WBIN);
  39
  40 #if defined (HAVE_SETVBUF)
  41   if (info_dribble_file)
  42 #  if defined (SETVBUF_REVERSED)
  43     setvbuf (info_dribble_file, _IONBF, (char *)NULL, 1);
  44 #  else
  45     setvbuf (info_dribble_file, (char *)NULL, _IONBF, 1);
  46 #  endif /* !SETVBUF_REVERSED */
  47 #endif /* HAVE_SETVBUF */
  48 }
  49
  50 /* If there is a dribble file already open, close it. */
  51 void
  52 close_dribble_file (void)
  53 {
  54   if (info_dribble_file)
  55     {
  56       fflush (info_dribble_file);
  57       fclose (info_dribble_file);
  58       info_dribble_file = (FILE *)NULL;
  59     }
  60 }
  61
  62 /* Write some output to our existing dribble file. */
  63 void
  64 dribble (unsigned char byte)
  65 {
  66   if (info_dribble_file)
  67     fwrite (&byte, sizeof (unsigned char), 1, info_dribble_file);
  68 }