texinfo/info/dribble.c

   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. */
  29 FILE *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. */
  33 void
  34 open_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. */
  53 void
  54 close_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. */
  65 void
  66 dribble (byte)
  67      unsigned char byte;
  68 {
  69   if (info_dribble_file)
  70     fwrite (&byte, sizeof (unsigned char), 1, info_dribble_file);
  71 }